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Everything You Need to Know About GDDR Memory

Brink

Staff member
mvp
Messages
32,205
Location
Oklahoma, USA
#1
Everything You Need to Know About GDDR Memory
Written by Michael Brown | 09/16/08 at 01:11:36 AM

We invariably refer to the video memory in modern videocards as GDDR, differentiating it only by version (GDDR2, GDDR3, GDDR4, and now GDDR5), but the technology’s full acronym is actually GDDR SDRAM, which stands for Graphics Double Data Rate Synchronous Dynamic Random Access Memory.

“Double data rate” describes the memory’s capacity for double-pumping data: Transfers occur on both the rising and falling edges of the clock signal. This endows memory clocked at 800MHz with an effective data-transfer rate of 1.6GHz. “Synchronous” refers to the memory’s ability to operate in time with the computer’s system bus. This allows the memory to accept a new instruction without having to wait for a previous instruction to be processed, a practice known as instruction pipelining.

GDDR2 memory was never a very popular solution among GPU manufacturers: The technology required 2.5 volts to power its input buffers and core logic (i.e., VDD voltage), which is the same as GDDR. GDDR2 operated at much higher clock speeds than its predecessor, however, which produced a tremendous amount of heat. The fact that GDDR2’s VDDQ voltage requirement (the electricity needed to power the memory’s output buffers) was only 1.8 volts didn’t compensate for this problem.


Read more at the Source: Everything You Need to Know About GDDR Memory | Maximum PC


gddrmemory.jpg
 

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mansrm81

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#2
Thanks for the info your a very informative person.
 

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Brink

Staff member
mvp
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#3
Your welcome Mansrm81.

I wonder if NVIDIA will support GDDR4 or GDDR5 anytime soon?

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 Maximus X Code Z370
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated
    Monitor(s) Displays
    3 x 27" Asus VE278Q
    Screen Resolution
    1920x1080
    Hard Drives
    250GB Samsung 960 EVO M.2,
    256GB OCZ Vector,
    6TB WD Black WD6001FZWX
    PSU
    Seasonic Prime Titanium 850W
    Case
    Corsair Air 740
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master
    Keyboard
    Logitech wireless K800
    Internet Speed
    300 Mb/s Download and 30 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Creative F200 webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB6190 cable modem,
    APC SMART-UPS RT 1000 XL,
    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

mansrm81

Vista Guru
Messages
1,884
Location
Rockford, IL
#4
Would be nice wish I had some $ for a new video card.
 

My Computer

System One

  • Manufacturer/Model
    HP Compaq Presario/SR5113WM
    CPU
    AMD Athlon 64 X2 3600+ 1.9Ghz
    Motherboard
    Asus M2N68-LA
    Memory
    PNY Optima Memory DDR2 2GB 2x1 kit
    Graphics Card(s)
    PNY Nvidia 8400 GS 256MB
    Sound Card
    On board RealTek
    Monitor(s) Displays
    Acer X163W LCD
    Screen Resolution
    1366x768
    Hard Drives
    Western Digital 160 GB SATA 3G (3.0Gb/sec)
    7200 rpm
    Western Digital 160 GB IDE
    PSU
    Dynex 400w
    Case
    Nothin Special
    Cooling
    Stock
    Mouse
    Wireless Logitech LX7
    Keyboard
    Standard 102 key with volume and sleep buttons
    Internet Speed
    Comcrap 10mb cable
    Other Info
    Insignia 2.1 speakers, wireless Xbox 360 controller w/plug n play charger, Belkin wireless G + mimo usb network adapter.

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