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GTX 970s can only use 3.5GB of 4GB VRAM issue - Page 26

post #251 of 2990
Wow look at that bandwidth drop!! thinking.gif
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post #252 of 2990
I'd also like to confirm that I cannot get VRAM above about 3600.
post #253 of 2990
Quote:
Originally Posted by specopsFI View Post

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.

Hmm....I have quick a look on GTX 780 distribution and compare it to GTX 780 TI. There is no problem with Kepler series.
There are 6 memory controllers at the diagram. There is no shortage of bandwidth. GTX 780 has 4 raster engines while GTX 780 TI has 5 raster engines. You could group / refer them by GPC if you wish so.
Each of the raster engine has its own memory controllers. I think two memory controllers are underutilized for GTX 780 while one memory controller underutilized for GTX 780 TI. No idea why nvidia sell it as 384 bits even although the aforementioned memory controller is kinda unused in a sense.
If you take a look, nvidia could actually put total 6 raster engine / GPC with each connected to their own memory controller. Yield issue maybe?
You could say GTX 780 effective width is 256 bit while GTX 780 TI is 320 bit. But then we will have to look on how the GDDR5 being soldered / connected to the memory interface at the circuit board.



Maxwell V2 is diferrent. Instead of cutting Raster Engine unit as they had done for Kepler 780 series, Maxwell V2 has its SMM or SMX equivalent of Kepler being disabled.

EDIT: wording issue + some info

EDIT V2: Anyone with GTX 780 and GTX 780TI kind enough to run Nai Benchmark and check for bandwidth speed? Make sure both gpu memory frequency are the same, gpu frequency too! I wanna check if there is any difference in term of memory bandwidth.
Edited by JohnLai - 1/23/15 at 3:10am
post #254 of 2990
I tested Far Cry 4 a bit on insane settings; Ultra, 4x TXAA and 4K-DSR, and like everyone has been saying, it will never go beyond 3500MB. Damn. Looks like I traded one gimped-memory card (GTX 660) for another!

Oh well, at least it can use more than 3GB. @1080p this will probably be a non-issue for the foreseeable future. Still, I will feel a bit ripped off, if this turns out to be a hardware problem. After all, I payed for 4GB, not 3.5GB...
Edited by gigafloppy - 1/23/15 at 3:12am
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post #255 of 2990
Sorry my bad, i ment Classic *doh*
I also had to leave for work.
post #256 of 2990
Running the Nai's benchmark sometimes I can't even go higher than 3gb and sometimes it would go up to 3.5gb
post #257 of 2990
Quote:
Originally Posted by gigafloppy View Post

I tested Far Cry 4 a bit on insane settings; Ultra, 4x TXAA and 4K-DSR, and like everyone has been saying, it will never go beyond 3500MB. Damn. Looks like I traded one gimped-memory card (GTX 660) for another!

Oh well, at least it can use more than 3GB. @1080p this will probably be a non-issue for the foreseeable future. Still, I will feel a bit ripped off, if this turns out to be a hardware problem. After all, I payed for 4GB, not 3.5GB...

I know your pain, i'm coming from the whopping 1.5Gb of memory advertised as 2GB as well. Only to be duped again!
post #258 of 2990
Err, guys, you do realize, that benchmark is designed for headless display mode, right? Which means you gotta use IGPU and put GTX 970 in headless display mode? Dont forget about windows compositing memory requirement , aero or non-aero.

EDIT: Not to mention web browsers also uses VRAM?
post #259 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 going to be super pissed if there is a version of the 960 with more usable VRAM than the 970.....
post #260 of 2990
Quote:
Originally Posted by generalkayoss View Post

I know your pain, i'm coming from the whopping 1.5Gb of memory advertised as 2GB as well. Only to be duped again!
well in the 660/660ti case it was 25% of the total. Now we're talking 12.5% of total. Not that i am any happier about it.
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