Auto Tuning - TCP/IP receive level

ByLine
How to Enable or Disable the Receive Window Auto Tuning Level in Vista
Synopsis
This will show you how to see your current TCP/IP Auto Tunning settings and how to test it to see if you have a problem with it. You will see a list of possible problems associated with this.
How to Enable or Disable the Receive Window Auto Tuning Level in Vista

information   Information
The TCP receive window size (RWIN) is the amount of data that a TCP receiver (your computer) allows a TCP sender (other internet or local network computer) to send before having to wait for an acknowledgement. After the connection is established, the receive window size is advertised in each TCP segment. Advertising that maximum amount of data that the sender can send is a receiver-side flow control mechanism that prevents the sender from sending data that the receiver cannot handle. A sending host can only send at a maximum the amount of data advertised by the receiver before waiting for an acknowledgment and a receive window size update. Auto Tuning adjusts the receive windows size continually based upon the changing network conditions. This usually happens if you have a network device (EX: Router, modem, etc.) that doesn’t support RFC 1323 “TCP Extensions for High Performance”.
Note   Note
The TCP window size field controls the flow of data and is limited to between 2 and 65,535 bytes, and cannot be expanded anymore. Thus, a scaling factor is used to get a larger TCP receive window size to achieve more efficient use of high bandwidth networks. The TCP window scale option is used to increase the maximum window size from 65,535 bytes to 1 Gigabyte. Scaling up to larger TCP congestion window sizes is a part of what is necessary for TCP Tuning.

When dealing with slow network performance in Vista, the problem may be due to the above mentioned TCP Window Scaling option, where many older routers and and packet firewalls do not properly implement TCP Window Scaling (doesn’t support RFC 1323), and rewrite the window scaling factor during a transmission, and causing sending and receiving sides to assume different TCP window sizes. The situation causes malfunction Internet connection, non-stable traffic that is very slow, or network connection that is only available intermittently.

Beside, Windows Vista enhances further TCP window scaling with auto tuning feature, where TCP stack in Vista system will auto tune and adjust the RWIN size to increase the percentage of full-sized TCP segments that are used during bulk data transmission based on the network scenario it encountered. And thus it’s no longer possible to specify a custom size for the TCP/IP Receive Window (RWIN) size with the inclusion of new auto tuning feature, unless the application it self uses SO_RCVBUF. However, Vista TCP auto tuning feature may get things wrong sometimes. Instead of optimal true receive window size, incompatible and out of range RWIN size may be used.

By default, Vista in normal auto tuning level will use RWIN size of 256 bytes with a scale factor of 8. This value is not suitable for all routers and servers which does not support TCP scale factor, and continue to communicate with 65536 bytes.

UPDATE: An Update on Windows TCP AutoTuningLevel - Windows 10 Forums

Tip   Tip
Possible TCP/IP Auto Tuning Related Problems:
  • Indefinite delay (hang) when opening the Certificate Services snap-in.
  • Slow (sometimes no) group policy application.
  • Trying to select a domain user in order to add that principal to a local security group (the object picker) would hang indefinitely.
  • Instant Messaging is not working well. Sometimes not at all by not being able to sign in.
  • Access to local file servers (EX: networked drives, etc.) are extremely slow and sometimes did not succeed at all (appears to hang).
  • Internet connection problems.
  • Extremely slow file transfers.
  • Other strange unexplained network connecting issues.
  • Wireless network connection problems
  • Website browsing and downloads are extremely slow.





FIRST
How To See Current Auto Tuning Settings

2. Click on Continue in the UAC prompt.​
3. In the command prompt, type in bold belowand press Enter. (See screenshot below)​
netsh interface tcp show global
Current setting.jpg

4. Close the command prompt when done.​
5. Run through the steps below to see if you have a TCP/IP Auto Tuning issue​





STEP ONE
How to Restrict Auto Tuning

2. Click on Continue in the UAC prompt.​
3. To Restrict Auto Tuning
NOTE: Allows for the receive window to grow beyond the default value of 65,535 bytes, but limits such growth in some scenarios.​
A) In command prompt, type in bold below and press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=restricted

B) You will get a OK response if successful. If not, repeat step 3A.​
Restricted.jpg

C) Go to step 5.​

4. To Highly Restrict Auto Tuning
NOTE: Allows for the receive window to grow beyond the default value of 65,535 bytes, but doing so very conservatively. In this mode, Vista will by default use a RWIN of 16,384 bytes with a scale factor of 2.​
A) In the command prompt, type in bold below and press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=high

B) You will get a OK response if successful. If not, repeat step 4A.​
Highly restricted.jpg


5. Close the command prompt window and restart the computer to apply the changes.​
6. If it fixed your problem stop here. If not, continue to Step Two below.​






STEP TWO
How to Disable Auto Tuning

NOTE: Disables the autotunning feature in Vista completely, and sets and locks the RWIN receive window to the default value as 65536 bytes.
2. Click on Continue in the UAC prompt.​
3. In the command prompt, type in bold belowand press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=disabled

Note   Note
You can also type in bold below and press enter after each command:
Note   Note

  • netsh
  • interface
  • tcp
  • set heuristics disabled
  • set global autotuninglevel=disabled
  • exit
4. You will get a OK response. If not, repeat step 3.​
Disable.jpg

5. Close the command prompt and restart the computer to apply the changes.​
6. If it fixed your problem stop here. If not, you may not have a issue with Auto Tuning and will need to turn it back on. Continue to Step 3 below.​






STEP THREE
How to Enable Auto Tuning Back to Normal Default

NOTE: This turns Auto Tuning back to the default on (Normal) setting in Vista. Allows for the receive window to grow to accommodate almost all scenarios. See NOTE at the top of the tutorial for more on this.
2. Click on Continue in the UAC prompt.​
3. In the command prompt, type in bold below and press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=normal

Note   Note
You can also type in bold below and press enter after each command:
Note   Note

  • netsh
  • interface
  • tcp
  • set heuristics enabled
  • set global autotuninglevel=normal
  • exit
4. You will get a OK response if successful. If not, repeat step 3.​
Enable.jpg

5. Close the command prompt and restart the computer to apply the changes.​
That's it,
Shawn


 

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Brink

Staff member
mvp
Your welcome NevGeorge, and welcome to Vista Forums.

Shawn
 

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hdbg62

Member
Had 'TCP' and 'Chimney' set to disabled for some time now. Being alerted again to the subject by new posts, I set everything back to 'normal' and it seems everything works a little smoother. Being relatively a user with moderate experience, perhaps I just got a bit overwhelmed by my new adventures with Vista HP/IE7.
 

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Tabu

New Member
I have a problem that i noticed 2 days ago. I have a strange delay of 30-60 seconds before any page start to load. Is not my connection since my other computer is running just fine. I have Vista64 installed on the one with the problem. Any idea what this is coming from?
 

My Computer

valhalla

New Member
i am also running 64 bit ultimate and im in the same boat as you m8 , its not my connection has when im downloading large files its constantley max my connection out , but when using internet explorer pages load up slowly then restart resizing started last week. run all the anti virus /spyware nothing shows up havnt put any new progs on or made any changes
debating weather to do a fresh install or not :cry:
 

My Computer

Brink

Staff member
mvp
Hello Tabu and Valhalla, and welcome to Vista Forums.

You may have a IE add-on that is causing the problem, maybe a added toolbar. Use Step One in this tutorial to see if running IE with no add-ons runs fine for you. If it does, then proceed to Step Two to find out which add-on is the problem and disable or remove it.

http://www.vistax64.com/tutorials/114310-internet-explorer-reset.html


You might also take a look at Resource Monitor to see what all is running while this happens and to see what is using the Network (step 7). You might also investigate any security program settings to see if they are interfering with it as it waits to approve it or not.

http://www.vistax64.com/tutorials/111020-resource-monitor.html


Hope this helps,
Shawn
 

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    Linksys EA9500 router,
    Arris SB8200 cable modem,
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    Lumia 1520 phone
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hdbg62

Member
Should have waited with my last post because the problem returned this morning; in the middle of browsing I just lost my internet connection. Did a diagnose and repair which told me to let it remove a certain configuration and then advised me that the problem was resolved and I did indeed get my connection back but then then in Problem Reports and Solutions I found this little jewel below; perhaps someone more knowledgeable can comment, especially on the "TcpWindowScaling" part:

NETWORK DIAGNOSTICS FRAMEWORK


Problem

Unable to diagnose/repair network problems.

Date 9/6/2008 02:15

Status Report Sent


Problem signature

Problem Event Name: NetworkDiagnosticsFrameworkV2

Vendor: Microsoft
OwnerHC: TcpWindowScaling
OwnerHCVersion: 1.0
SessionStatus: 5
HRESULT: 0
Repair: {60FF9E63-E0A8-46ed-BACA-A4B15F978F11}
RootCauseHC: TcpWindowScaling
RootCauseHCVersion: 1.0
RootCause: {4718EC19-C565-4213-A81C-10B23F073617}
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033

Extra information about the problem
Bucket ID: 32693631




I'm beginning to wonder if all my browsing problems are not related to my internet service which is dry loop DSL through ATT at 6000/781 kb/s max; speed tests average 5100/650. Have had a few issues with them in the past and at one point was told that I may need to downgrade to 3000 kb/s because I'm pretty close to the limit as far as my distance to the nearest point of connection is concerned; 6900 out of 7000 feet.
 

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System One

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    MAXTOR 320 G USB
    Internet Speed
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Tabu

New Member
Hello Tabu and Valhalla, and welcome to Vista Forums.

You may have a IE add-on that is causing the problem, maybe a added toolbar. Use Step One in this tutorial to see if running IE with no add-ons runs fine for you. If it does, then proceed to Step Two to find out which add-on is the problem and disable or remove it.

http://www.vistax64.com/tutorials/114310-internet-explorer-reset.html


You might also take a look at Resource Monitor to see what all is running while this happens and to see what is using the Network (step 7). You might also investigate any security program settings to see if they are interfering with it as it waits to approve it or not.

http://www.vistax64.com/tutorials/111020-resource-monitor.html


Hope this helps,
Shawn

I dont have any addons on IE or Firefox. I have the same problem on all browsers even in windows mail. Takes forever to connect to the mail server.

Anyway, i realized that i have this problem if utorrent is running. If utorrent isnt running then everything is fine. I have to mention that i had utorrent installed since the beginning, but i noticed this problem on the last few days. I dont have any clue how utorrent can generate such problem and not from the start. Must be another setting that changed and caused this. The only things that i did were the tweaks found on this forum and not all of them. Can be the services that i disabled? From that guide i choosed the safe ones. If anyone have more experience with Vista please advise. I tried to install another torrent client but bittorrent instalation stopped at 30% and didnt continue. I cant think on anything else than undo all the tweaks found here.
 

My Computer

Brink

Staff member
mvp
Tabu,

It seems that you have found the problem as being with the utorrent program. You might try uninstalling it and reinstalling it to see if something was corrupt with it.

You can undo the tweaks here if you like to, but if everything works fine when you do not have utorrent running, then that must be the problem.

You might post a separate post about utorrent and this problem in one of the forums to see what suggestions you may get about it.

Hope you can get a solution soon.

Shawn
 

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    ASUS ROG Maximus XI Formula Z390
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    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
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    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
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    1 Gb/s Download and 35 Mb/s Upload
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    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
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    Windows 10 Pro
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    HP Envy Y0F94AV
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    i7-7500U @ 2.70 GHz
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    16 GB DDR4-2133
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    512 GB M.2 SSD

valhalla

New Member
i think its got to do more with my internet has last night took my vist64 pc
and my trusty old xp pc downstairs and plugged the into my master socket and im getting hardly any upload speeds i.e 88kbs instead off 486kbs
ive got my isp looking into it at the mo

just one more question in step one when i go into cmd /global settings

my chimney offload state is disabled ----should this be enabled like your screenshot and how do i do it

thanx in advance
 

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Brink

Staff member
mvp

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System One System Two

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    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
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    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
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    2 x Samsung Odyssey G7 27"
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    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
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    Conexant ISST Audio
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    512 GB M.2 SSD

mansrm81

Vista Guru
Thanks Shawn it really made my internet faster.
 

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Brink

Staff member
mvp
Your welcome Mansrm81.

Shawn
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD
Thanks for the guide Brink! didn't know I could tweak that ^^
 

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System One

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VistaLava

Member
so if i haven't done anything except read the settings via netsh interface tcp show global, and i get highlyrestricted, what does this mean for Vista Ultimate SP1 32bit.

sorry, now i know it just means that windows will adjust my settings but in a very conservative fashion.
Oh and it seems that the Chimney Offload setting is off when the network card dosent support the diversion of load from the processor to the NIC.
 
Last edited:

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Brink

Staff member
mvp
Hi VistaLava,

I have updated the tutorial to include more information about what the settings mean and do. It's a bit techy, but it's about as simple of an explanation that I can make it to help explain them without to many boring details. ;)

Hope this helps,
Shawn
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD

TorchMan

Member
Hi,

I just tried this improvment to my OS, but i was very surprised, because all this mentioned features was disabled by default. I've never done any changes.

10503999to9.jpg


But myabe this can be caused by few changes in the services ( followed from your tutorial above " Disable Unused Vista Services " )

Can be this caused due this tweaking of services?

Thanks in advice.

TorchMan™
 

My Computer

System One

  • CPU
    Intel Core2Quad, 2400Mhz
    Motherboard
    Asus P5N32-E SLI
    Memory
    2X A-Data Extreme 1GB DDR2 SDRAM
    Graphics Card(s)
    MSI NX8600GTS-E
    Hard Drives
    #1 - Seagate Barracuda 7200rpm. 111GB

    #2 - WesternDigital 7200rpm. 235GB

Brink

Staff member
mvp
Hi TorchMan, and welcome to Vista Forms.

I have not seen this caused by disabling Services before. I have quite a few disabled and do not have this.

This command will enable the Chimney Offload State.

netsh interface tcp set global chimney=enabled


The ECN and RFC should be disabled by default.

Hope this helps,
Shawn
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD

TorchMan

Member
Hi. I've talking about this problem whit my friend, and he said, this turned on feature can help, when you runnning at speedy internet connection ( our connection is ADSL type whit proclaimed 8Mb/s :sarc:) because ISP should have a appropriate hardware;).

But anyway i try to compare this two settings and tell you my impressions....
____________

Okay, i've tried this and i must say, the enabled Auto-tuning and Chimney offload state fits better for me. I got better results on public speed test servers, ftp connections or only on our home LAN.

Thank you a lot Brink, cos thanks to this tutorial i've discovered this windows feature:party:.

Whit big respect

TorchMan™
 

My Computer

System One

  • CPU
    Intel Core2Quad, 2400Mhz
    Motherboard
    Asus P5N32-E SLI
    Memory
    2X A-Data Extreme 1GB DDR2 SDRAM
    Graphics Card(s)
    MSI NX8600GTS-E
    Hard Drives
    #1 - Seagate Barracuda 7200rpm. 111GB

    #2 - WesternDigital 7200rpm. 235GB

Brink

Staff member
mvp
Your welcome TorchMan. I'm happy to hear that you are getting better results now.

Shawn
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD
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