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GTX 970s can only use 3.5GB of 4GB VRAM issue - Page 18

post #171 of 2990
Quote:
Originally Posted by specopsFI View Post

And what if the ultra-HD textures in SoM require more than 4GB of VRAM? As in something like the 6GB that it officially requires? That would put the blame not on the last 512MB of VRAM being slower but rather the full 4GB coming short of demand.

Also, I haven't seen full-proof evidence of the GTX 980 using more VRAM in the same scenario. There are screen captures that are said to demonstrate it, but many of those have different settings, different resolutions, different test setups... And yes, many of those have been proven to be false or misleading.

I know there are now a certain amount of people who scream for vengeance over this, but there is still nothing substantial in the proof department. Proof of this being an issue would be A) a somewhat plausible hypothesis of a possible root cause and/or B) a reputable 3rd party doing a test comparing a 980 and a 970 overclocked to the same general performance level, running several known VRAM heavy titles and recording frame times with both.
even if there is "proof" there is no way to know its not just a driver bug.

I wish one of the big reviewer sites would test the issue against a control group.
Edited by Wirerat - 1/22/15 at 11:42am
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post #172 of 2990
Quote:
Originally Posted by specopsFI View Post

There is zero evidence of that being the case. I've been keeping my eye on the forums here, Guru3D, Anandtech, geforce.com etc. and I've seen this speculation repeated many times, but nothing resembling evidence of it. Using settings that get you to 4GB VRAM usage are also settings that increase the complexity of the scene that the GPU is rendering which is the logical reason for diminishing performance.


You should ask Nvidia for the difference in the Nai benchmark. Last 500MB are much slower. There is a technical reason for this which a driver update cannot solve.


post #173 of 2990
Quote:
Originally Posted by mrkk View Post

You should ask Nvidia for the difference in the Nai benchmark. Last 500MB are much slower. There is a technical reason for this which a driver update cannot solve.



Wow...It seems it's hardware issue. Time to return my gtx.
post #174 of 2990
Quote:
Originally Posted by berbuzer View Post

Wow...It seems it's hardware issue. Time to return my gtx.

The 980 being faster with a full frame buffer seems logical to me.
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post #175 of 2990
My Dxdiag also does that - 4095MB on 32 bit, 3627 on 64-bit.

Where can i download that Nai benchmark?
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post #176 of 2990
Quote:
Originally Posted by Wirerat View Post



The 980 being faster with a full frame buffer seems logical to me.

Faster by an order of magnitude? Why, because it has 23% more smm? I don't see the logic, myself.
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post #177 of 2990
Quote:
Originally Posted by Wirerat View Post



The 980 being faster with a full frame buffer seems logical to me.

Now I can see why my GTX970 stuttering when VRAM exceeds 3.5 GB.
post #178 of 2990
Quote:
Originally Posted by Cyro999 View Post

Faster by an order of magnitude? Why, because it has 23% more smm? I don't see the logic, myself.
i just mean ratio wise. Why wouldnt the faster card slow down a little less percentage wise?

Unless its costing the card so much performance that it cannot use the vram there isnt an issue.
Edited by Wirerat - 1/22/15 at 12:32pm
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post #179 of 2990
Quote:
Originally Posted by mrkk View Post

You should ask Nvidia for the difference in the Nai benchmark. Last 500MB are much slower. There is a technical reason for this which a driver update cannot solve.



Wow, that is crazy.
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post #180 of 2990
Quote:
Originally Posted by Cyro999 View Post

My Dxdiag also does that - 4095MB on 32 bit, 3627 on 64-bit.

Where can i download that Nai benchmark?

From Nai
http://www.computerbase.de/forum/showthread.php?t=1435408&page=2&p=16877818#post16877818


This is a CUDA based application and should work on any Kepler and Maxwell card. You might need cudart64_65.dll: https://mega.co.nz/#!Eh0GzT4D!Kjhqzljt-i-MtHV82ktDQ8RY002JT7VIhVNpUaVpN6U

Because this application runs in a window you have to either kill DWM or use your iGPU as primary GPU. Otherwise you possibly won't get the best result because desktop does use some VRAM.
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