RAM speed on eVGA 750i

Everlong

To xor or not to xor
Vista Guru
So was just looking around at prices for my new build I'm getting next month, and was looking at scan.co.uk and it said for memory, the only speeds it supported was 800 and 1066. I went to look on the eVGA website, and it said all DDR2 RAM was support, so I thought fair enough.

The RAM I'm using right now is Corsair XMS2 667. My question being, is 667 RAM in dual channel going to put up alright on the 750i motherboard?
From reading other forums, it says that 667 DDR2 in dual channel has the same bandwidth as 1333 in single channel, so saying this I'd say it would be okay? I know 800 would be better for me, but I won't be doing that upgrade for another few months yet, as I'd have thought the RAM I have now is enough.

Edit - Another question: I've never used Intel CPUs before, but how much effort would it take to get the RAM from 667 to 800 when overclocking the CPU?
 

My Computer

System One

  • Manufacturer/Model
    Custom Built
    CPU
    Intel Core 2 Quad Q9550
    Motherboard
    XFX MB-750I-72P9 NF750i
    Memory
    4096MB Corsair XMS2 PC-5400
    Graphics Card(s)
    ASUS Nvidia Geforce GTX470
    Sound Card
    ASUS Xonar DX
    Monitor(s) Displays
    Dell 24" S2409W & Dell 20" E207WFP
    Screen Resolution
    1920x1080 & 1680x1050
    Hard Drives
    750GB Western Digital Caviar Black & 500GB Samsung
    PSU
    750 watt Thermaltake Toughpower
    Case
    Coolermaster Dominator 690 Nvidia Edition
    Cooling
    Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
    Mouse
    Logitech G5 Laser Mouse (2007 edition)
    Keyboard
    Logitech G11 Keyboard
    Internet Speed
    100Mbps
    Other Info
    abit airpace 54mbps wireless PCI-E x1 card

Fumz

Buggin
Vista Guru
RAM speed and memory bandwidth are two different things. DDR2 667 describes its speed: 667MHz DDR. It's bandwidth is 5.4GB/s. They use the memory's bandwidth as a second name, which in your case is PC-5400. You can use the names interchangeably.

However, DDR2 667, aka PC-5400 does not have the same bandwidth as DDR3 1333, aka PC-10660, which has a speed of 1333MHz DDR and a bandwidth of 10.6GB/s. No amount of overclocking is going to get DDR2 667 anywhere near the bandwidth of DDR3 1333 or DDR2 1066. Even getting close to DDR2 800 would be a phenomenal feat.

Having said all that, memory bandwidth doesn't mean squat anymore. Sure, ideally you'd like to be running at least 800MHz RAM, but after that, from 800MHz to 1100MHz DDR2, the gains aren't dramatic... they're there, they're just not dramatic enough to make a meaningful difference.

As for your board specifically, I don't know if you're going to have a problem as you RAM's speed isn't even supported? In theory it should work just fine; in practice, I'm not sure? It might work, but with RAM so cheap, you may as well bite the bullet and get at least DDR2 800?
 

My Computer

System One

  • Manufacturer/Model
    Fumz' Flux-Capacitor
    CPU
    E8400
    Motherboard
    DFI LP DK P35-T2RS
    Memory
    4GB G.Skill PC-1066
    Graphics Card(s)
    eVGA 8800 GTS
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    500GB W.D. RE2 Primary
    1TB W.D. Caviar GP WD10EACS
    PSU
    PC Power & Cooling Silencer 610
    Case
    Lian Li Lancool K62
    Cooling
    Thermalright Ultima-90/S-Flex 120mm
    Mouse
    Logitech G5
    Keyboard
    MS Natural Elite 4000 Ergonomic
    Internet Speed
    2.5MB/430
    Other Info
    D-Link DGL 4500

Everlong

To xor or not to xor
Vista Guru
What I said about the bandwidth was 667MHz in dual channel has the same bandwidth as 1333 in single channel. So 5.4GB/s on 667MHz single channel, would effectively double to 10.8GB/s, which is around the same as 1333MHz in single channel. It won't operate at that speed, just up to that speed. That was what some people were talking about on some hardware forum.

The RAM I have is supported as well according to the eVGA website. Though if the theory that I've read of 667MHz in dual channel is right, then I suppose I won't have a bottleneck problem with the RAM.
 

My Computer

System One

  • Manufacturer/Model
    Custom Built
    CPU
    Intel Core 2 Quad Q9550
    Motherboard
    XFX MB-750I-72P9 NF750i
    Memory
    4096MB Corsair XMS2 PC-5400
    Graphics Card(s)
    ASUS Nvidia Geforce GTX470
    Sound Card
    ASUS Xonar DX
    Monitor(s) Displays
    Dell 24" S2409W & Dell 20" E207WFP
    Screen Resolution
    1920x1080 & 1680x1050
    Hard Drives
    750GB Western Digital Caviar Black & 500GB Samsung
    PSU
    750 watt Thermaltake Toughpower
    Case
    Coolermaster Dominator 690 Nvidia Edition
    Cooling
    Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
    Mouse
    Logitech G5 Laser Mouse (2007 edition)
    Keyboard
    Logitech G11 Keyboard
    Internet Speed
    100Mbps
    Other Info
    abit airpace 54mbps wireless PCI-E x1 card

Fumz

Buggin
Vista Guru
I think those discussions are more academic? 2x667 would equal 1333 if you only ran one stick of 1333? Who does that?

Dual channel, if memory serves me correctly (it may be hazy on this) refers to the interface between cpu and memory. Single channel is half the size of dual... it doesn't specifically have to do with the RAM in question.
 

My Computer

System One

  • Manufacturer/Model
    Fumz' Flux-Capacitor
    CPU
    E8400
    Motherboard
    DFI LP DK P35-T2RS
    Memory
    4GB G.Skill PC-1066
    Graphics Card(s)
    eVGA 8800 GTS
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    500GB W.D. RE2 Primary
    1TB W.D. Caviar GP WD10EACS
    PSU
    PC Power & Cooling Silencer 610
    Case
    Lian Li Lancool K62
    Cooling
    Thermalright Ultima-90/S-Flex 120mm
    Mouse
    Logitech G5
    Keyboard
    MS Natural Elite 4000 Ergonomic
    Internet Speed
    2.5MB/430
    Other Info
    D-Link DGL 4500

xguntherc

I Click Home To Much
Vista Guru
you'd probably be fine to run it. but you might as well spend $50 bucks and get some good Crucial DDR2-800 ram somewhere.. that would be a good improvement.
 

My Computer

System One

  • CPU
    Q9650 E0 4.0 GHz @1.304v
    Motherboard
    eVGA 750i FTW
    Memory
    2x2GB Corsair Dominator PC2-8500C5D
    Graphics Card(s)
    eVGA/MSI GTX 260 SLI
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung T240 & 226BW
    Screen Resolution
    1920x1200 & 1680x1050
    Hard Drives
    Seagate Cuda 500GB 32mb Cache SATA 7200.(11) + 500GB Seagate Cuda External eSATA, USB, FW400
    PSU
    PC P&C 750w Silencer PSU
    Case
    CoolerMaster HAF 932 (Water-Cooled)
    Cooling
    Plenty of Fans, and a few 230mm Fans
    Mouse
    Logitech MX-518
    Keyboard
    Logitech G11
    Other Info
    ASUS 20x Optical, Bose Companion 3, ATH-AD500 Cans :), Patriot Xporter 16GB Flash Drive (Very Fast), & Sandisk Micro 8GB.

    Nikon D40 DSLR with 18-105mm VR & 55-200mm VR

Everlong

To xor or not to xor
Vista Guru
If this 667Mhz runs fine, then I'll probably leave the RAM upgrade until around Christmas.

My main concern though was running in to bottleneck problems with it.


So to what Fumz said, overclocking the speed of the RAM doesn't mean you're overclocking the bandwidth of the RAM itself?
 

My Computer

System One

  • Manufacturer/Model
    Custom Built
    CPU
    Intel Core 2 Quad Q9550
    Motherboard
    XFX MB-750I-72P9 NF750i
    Memory
    4096MB Corsair XMS2 PC-5400
    Graphics Card(s)
    ASUS Nvidia Geforce GTX470
    Sound Card
    ASUS Xonar DX
    Monitor(s) Displays
    Dell 24" S2409W & Dell 20" E207WFP
    Screen Resolution
    1920x1080 & 1680x1050
    Hard Drives
    750GB Western Digital Caviar Black & 500GB Samsung
    PSU
    750 watt Thermaltake Toughpower
    Case
    Coolermaster Dominator 690 Nvidia Edition
    Cooling
    Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
    Mouse
    Logitech G5 Laser Mouse (2007 edition)
    Keyboard
    Logitech G11 Keyboard
    Internet Speed
    100Mbps
    Other Info
    abit airpace 54mbps wireless PCI-E x1 card

Fumz

Buggin
Vista Guru
As you increase RAM speed you also increase it's bandwidth. I was just saying that in order to increase DDR2 667's bandwidth to the bandwidth of DDR2 1066 you'd have to increase the frequency from 333MHz to 533MHz, and that matching DDR3 1333's bandwidth would require an increase to 666MHz, and that would be difficult to do.
 

My Computer

System One

  • Manufacturer/Model
    Fumz' Flux-Capacitor
    CPU
    E8400
    Motherboard
    DFI LP DK P35-T2RS
    Memory
    4GB G.Skill PC-1066
    Graphics Card(s)
    eVGA 8800 GTS
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    500GB W.D. RE2 Primary
    1TB W.D. Caviar GP WD10EACS
    PSU
    PC Power & Cooling Silencer 610
    Case
    Lian Li Lancool K62
    Cooling
    Thermalright Ultima-90/S-Flex 120mm
    Mouse
    Logitech G5
    Keyboard
    MS Natural Elite 4000 Ergonomic
    Internet Speed
    2.5MB/430
    Other Info
    D-Link DGL 4500

Everlong

To xor or not to xor
Vista Guru
Well yea I understand that, as my original point was 667 RAM in dual channel is the same as 1333 RAM in single channel, even though nobody runs a single 1333MHz stick, but my theory was that if a 1333MHz stick in single channel would run fine, then I'd imagine 667 RAM in dual channel would be fine as well.

But thanks for the help anyway :)
 

My Computer

System One

  • Manufacturer/Model
    Custom Built
    CPU
    Intel Core 2 Quad Q9550
    Motherboard
    XFX MB-750I-72P9 NF750i
    Memory
    4096MB Corsair XMS2 PC-5400
    Graphics Card(s)
    ASUS Nvidia Geforce GTX470
    Sound Card
    ASUS Xonar DX
    Monitor(s) Displays
    Dell 24" S2409W & Dell 20" E207WFP
    Screen Resolution
    1920x1080 & 1680x1050
    Hard Drives
    750GB Western Digital Caviar Black & 500GB Samsung
    PSU
    750 watt Thermaltake Toughpower
    Case
    Coolermaster Dominator 690 Nvidia Edition
    Cooling
    Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
    Mouse
    Logitech G5 Laser Mouse (2007 edition)
    Keyboard
    Logitech G11 Keyboard
    Internet Speed
    100Mbps
    Other Info
    abit airpace 54mbps wireless PCI-E x1 card

Fumz

Buggin
Vista Guru
Yeah no, don't get me wrong, I think it'll run fine too. I guess I was just confused by the wording of the initial post?
 

My Computer

System One

  • Manufacturer/Model
    Fumz' Flux-Capacitor
    CPU
    E8400
    Motherboard
    DFI LP DK P35-T2RS
    Memory
    4GB G.Skill PC-1066
    Graphics Card(s)
    eVGA 8800 GTS
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    500GB W.D. RE2 Primary
    1TB W.D. Caviar GP WD10EACS
    PSU
    PC Power & Cooling Silencer 610
    Case
    Lian Li Lancool K62
    Cooling
    Thermalright Ultima-90/S-Flex 120mm
    Mouse
    Logitech G5
    Keyboard
    MS Natural Elite 4000 Ergonomic
    Internet Speed
    2.5MB/430
    Other Info
    D-Link DGL 4500

Everlong

To xor or not to xor
Vista Guru
Yea, you might have just missed the dual/single channel theory bit, but no worries :)
 

My Computer

System One

  • Manufacturer/Model
    Custom Built
    CPU
    Intel Core 2 Quad Q9550
    Motherboard
    XFX MB-750I-72P9 NF750i
    Memory
    4096MB Corsair XMS2 PC-5400
    Graphics Card(s)
    ASUS Nvidia Geforce GTX470
    Sound Card
    ASUS Xonar DX
    Monitor(s) Displays
    Dell 24" S2409W & Dell 20" E207WFP
    Screen Resolution
    1920x1080 & 1680x1050
    Hard Drives
    750GB Western Digital Caviar Black & 500GB Samsung
    PSU
    750 watt Thermaltake Toughpower
    Case
    Coolermaster Dominator 690 Nvidia Edition
    Cooling
    Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
    Mouse
    Logitech G5 Laser Mouse (2007 edition)
    Keyboard
    Logitech G11 Keyboard
    Internet Speed
    100Mbps
    Other Info
    abit airpace 54mbps wireless PCI-E x1 card

Fumz

Buggin
Vista Guru
Yeah, the last time I bothered looking into dual vs single channel we were running AMD XP cpu's... and it didn't really matter whether you got an nforce with dual channel or a VIA chipset with single channel; they both performed about the same. What I was missing was that "single stick" part as I assumed everyone was talking about using 2 sticks.

Not really sure about 2 sticks of 1333 in single channel vs 667 in dual, but it would be interesting to find out?
 

My Computer

System One

  • Manufacturer/Model
    Fumz' Flux-Capacitor
    CPU
    E8400
    Motherboard
    DFI LP DK P35-T2RS
    Memory
    4GB G.Skill PC-1066
    Graphics Card(s)
    eVGA 8800 GTS
    Sound Card
    X-Fi XtremeGamer
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    500GB W.D. RE2 Primary
    1TB W.D. Caviar GP WD10EACS
    PSU
    PC Power & Cooling Silencer 610
    Case
    Lian Li Lancool K62
    Cooling
    Thermalright Ultima-90/S-Flex 120mm
    Mouse
    Logitech G5
    Keyboard
    MS Natural Elite 4000 Ergonomic
    Internet Speed
    2.5MB/430
    Other Info
    D-Link DGL 4500
Top