GPU issue or miss understooded?

[d3l3t3r]

Hello dears,

 

I have a GTX 970 Gigabyte G1 Windforce:

https://www.gigabyte.com/Graphics-Card/GV-N970WF3OC-4GD-rev-10-11#sp

Here it says:Memory clock 7Gbs

 

I just used Open Hardware Monitor in order to check the temperature (I had some temperature problems, I fixed them with a new case fan - those are the results after 5 hours of PUBG).

My concern is, in OHM it says GPU Memory 3505 which is half what OC GURU is displaying Memory Clock 7010.

 

This is not about the VRAM as you can see in the Data entry from OHM it says GPU Memory Total 4096MB.

Screenshot attached.

 

Sorry to post here, but... Yes, I tried to google it, but the results are about the 3.5gb VRAM instead of 4gb VRAM on GTX 970.

 

Please, if I miss understood something or called the terms in a wrong way, just tell me! I'm here to learn!

 

 

 

 

 

[COUPER MILLAR]

DDR in GDDR5 stands for Double Data Rate. HWMonitor is reporting the raw memory clock not the calculated clock. The advertised clock rate of the memory is 2x what is being displayed in HWMonitor. 

[d3l3t3r]

3 minutes ago, COUPER MILLAR said:

DDR in GDDR5 stands for Double Data Rate. HWMonitor is reporting the raw memory clock not the calculated clock. The advertised clock rate of the memory is 2x what is being displayed in HWMonitor. 

Thanks for the fast answer! Is there any video that I can watch and learn this new thing? (new for me).

[COUPER MILLAR]

Here ya go, its a quick and dirty summary. 

https://en.wikipedia.org/wiki/DDR_SDRAM

[-rascal-]

41 minutes ago, COUPER MILLAR said:

DDR in GDDR5 stands for Double Data Rate. HWMonitor is reporting the raw memory clock not the calculated clock. The advertised clock rate of the memory is 2x what is being displayed in HWMonitor. 

 

35 minutes ago, d3l3t3r said:

Thanks for the fast answer! Is there any video that I can watch and learn this new thing? (new for me).

 

Well, GDDR5 is actually quad-pumped -- it's effective memory speed is 4x the actual operating frequency.

 

Using this picture as an example diagram..

 

Typical system memory (e.g. DDR3 and DDR4) can perform two data transfer operations per one clock cycle -- one on the rising-edge, and one on the falling-edge of the clock. That's why you look at CPU-Z, it shows your DDR4 2133 MHz RAM running at ~1066 MHz.

2133 MHz is the effective frequency, while 1066 MHz is the actual operating frequency.

 

GDDR5 memory on a graphics card is  the same, but instead of double, it's quadruple.

The 7000 MHz on your GTX 970 is actually running at 1750 MHz.

Some programs will show 7000 MHz, 3500 MHz, or 1750 MHz.

 

GPU-Z shows the actually operating frequency (see the 1753 MHz for memory).

 

If my memory is correct, programs such as MSI Afterburner and EVGA PrecisionX, you can choose how it shows the GPU memory in the settings; either actual, 2x or 4x. I use Sapphire TriXX for my GPUs (since I'm running Sapphire graphics cards), and there is an check-box to "Show effective memory clocks".

 

 

 

[d3l3t3r]

7 hours ago, -rascal- said:

 

 

Well, GDDR5 is actually quad-pumped -- it's effective memory speed is 4x the actual operating frequency.

 

Using this picture as an example diagram..

 

Typical system memory (e.g. DDR3 and DDR4) can perform two data transfer operations per one clock cycle -- one on the rising-edge, and one on the falling-edge of the clock. That's why you look at CPU-Z, it shows your DDR4 2133 MHz RAM running at ~1066 MHz.

2133 MHz is the effective frequency, while 1066 MHz is the actual operating frequency.

 

GDDR5 memory on a graphics card is  the same, but instead of double, it's quadruple.

The 7000 MHz on your GTX 970 is actually running at 1750 MHz.

Some programs will show 7000 MHz, 3500 MHz, or 1750 MHz.

 

GPU-Z shows the actually operating frequency (see the 1753 MHz for memory).

 

If my memory is correct, programs such as MSI Afterburner and EVGA PrecisionX, you can choose how it shows the GPU memory in the settings; either actual, 2x or 4x. I use Sapphire TriXX for my GPUs (since I'm running Sapphire graphics cards), and there is an check-box to "Show effective memory clocks".

 

 

 

Thank you very much!