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GTX 970s can only use 3.5GB of 4GB VRAM issue - Page 25

post #241 of 2990
Sorry it's hard to keep up with this thread. In light of the confirmation shown by the nai benchmark, how does this affect the prior belief that this was something driver related because OpenGL was working as expected with all 4gb?
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post #242 of 2990
There's clearly huge slowdowns for both VRAM and cache when accessing certain parts of it (unless there is some fault in that benchmark)

I don't really know if it could be driver related or not and i don't think anybody actually really knows for sure
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post #243 of 2990
Quote:
Originally Posted by cooperb21 View Post

Nvidia is at least looking into it they said they will have update soon. From 8 hours ago.

https://forums.geforce.com/default/topic/803518/geforce-900-series/gtx-970-3-5gb-vram-issue/9/

Yea.. especially if it turns out to be failure in hardware and no amount of driver can fix it. People gonna be pissed maybe even as for refunds or sue.
post #244 of 2990
Quote:
Originally Posted by juano View Post

Sorry it's hard to keep up with this thread. In light of the confirmation shown by the nai benchmark, how does this affect the prior belief that this was something driver related because OpenGL was working as expected with all 4gb?

Well, of course we can use all 4Gb in a sense, but the performance after filling above 3.3 - 3.5gb suffers.

Seem like for GTX 960, if nvidia wants to introduce 4GB variant, they better use four 1GB chip instead of eight 512Mb chips. Otherwise, the same issue will rear its head.
post #245 of 2990
really quite shocked at this more so for those that have invested in 2 gpus like myself to be able to play at higher resolution. Effectively there is no point to buy 2 or 3 gpus because you will be gimped by the vram limitation , very misleading nvidea.

For months i have been tring to diagnose stutter issues at higher vram but finally its been solved , like most i could have saved a lot of time if nivdea had been honest about what they done , i feel bad about selling cards like im ripping someone of although nvidea dident care seling them to me.

Im even more annoyed that reviewers did not pick up on this OR the sli voltage issue, lets be honest it puts a lot of reviews into question and i suppose they wont say anything because if they do they wil lbe biting the hand that feeds them.
Edited by tonnytech - 1/23/15 at 12:59am
post #246 of 2990
Quote:
Originally Posted by JohnLai View Post

Well, of course we can use all 4Gb in a sense, but the performance after filling above 3.3 - 3.5gb suffers.

Seem like for GTX 960, if nvidia wants to introduce 4GB variant, they better use four 1GB chip instead of eight 512Mb chips. Otherwise, the same issue will rear its head.

I'm working on a sample app that will exactly work on stressing memory, but it takes much more time than just fill-up test so it may take a while and meanwhile we will probably get official nvidia reply.
post #247 of 2990
Quote:
Originally Posted by toncij View Post

I'm working on a sample app that will exactly work on stressing memory, but it takes much more time than just fill-up test so it may take a while and meanwhile we will probably get official nvidia reply.

In that case, it would be good if your sample app can test the memory bandwidth + allocated gpu memory similar to the Nai's Benchmark.

Those who interested with Nai's Benchmark can visit http://www.computerbase.de/forum/showthread.php?t=1435408 . There is megaupload link at that forum.

toncij, perhaps you would like to take a look on Nai source code at post #9 there.
post #248 of 2990
Quote:
Originally Posted by JohnLai View Post

In that case, it would be good if your sample app can test the memory bandwidth + allocated gpu memory similar to the Nai's Benchmark.

Those who interested with Nai's Benchmark can visit http://www.computerbase.de/forum/showthread.php?t=1435408 . There is megaupload link at that forum.

toncij, perhaps you would like to take a look on Nai source code at post #9 there.

If Nai's works, then we don't need yet another one, right? smile.gif
post #249 of 2990
That nai benchmark is interesting, but I'm still skeptical. There are too many fresh users posting screenshots of unknown origin for me to jump on the "issue confirmed" bandwagon. I need a reputable source and not just for this benchmark but actual gameplay being affected. I certainly didn't see a problem with my own Watch_Dogs testing, hitting 3750MB VRAM without excessive stuttering. Beyond that, I can't say.

I have no problem with this being discussed but I see a lack of critical thinking and confirmed evidence of an actual issue. The job of these GPUs is playing games as good as possible and that is what all the reviews and my personal experience are showing. The theory of disabled SMM's and their distribution is interesting though, as that could explain different results for different people. I do recall the rather small debate on GTX 780's (which also had three SMX's disabled) on whether or not there is a performance difference between a chip where the disabled SMX's are evenly distributed and a chip where all three disabled SMX's are within a single GPC (see http://www.anandtech.com/show/6973/nvidia-geforce-gtx-780-review). Obviously it wasn't a big enough issue with GTX 780, but that is not to say Maxwell couldn't be different.

So still not convinced, but there could be something here. I'm more and more inclined to think we will get an answer rather sooner than later, though.
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post #250 of 2990
My results:

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