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GTX 970s can only use 3.5GB of 4GB VRAM issue - Page 5

post #41 of 2990
Alright then.

Brand: MSI
Model: GTX 970 Gaming 4G
BIOS Version: NV316MH.184 (gpu-z: 84.01.31.00.F1)
Driver Version: 347.09
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post #42 of 2990
Quote:
Originally Posted by mouacyk View Post

Can the people having this issue post the following information?

Brand
Model
BIOS Version
Driver Version

Buying or not buying the speculation at this point is moot -- some people are obviously having the problem. Help those of us who are about to upgrade avoid problematic products based on the above information. We've heard about the bait-and-switch tactic used recently in cheap motherboards. What's to say, some 970's (yes, they are cheap relative to 980's) are cutting costs, banking on a gamble that most games through their in-game settings do NOT consume more than 3.5GB of memory (not even close to it).

Let's not let NVidia get away with something like the GTX 660's again.

From Guru3d:

GTX 970 Vram usage chart (XLSX)

Edit work book > Edit Online.
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post #43 of 2990
Wow its like 90% gigabyte and msi cards so far
post #44 of 2990
Quote:
Originally Posted by cocopopsonfire View Post

Wow its like 90% gigabyte and msi cards so far

No surprise as that's what most people are buying for 970s smile.gif
post #45 of 2990
It will be interesting to see if some manufacturers have avoided this somehow
post #46 of 2990
Brand: MSI

Model: GTX 970 Gaming 4G

BIOS Version: 84.04.1F.00.F1 stock and modded 126 tested / 84.04.2F.00.F1 stock and modded 182 tested /
currently running 182 modded 84.04.2F.00.F1

Driver Version: 347.09 (current)
post #47 of 2990
I ran the MSI Kombuster GPU Memory Burner test at 1GB, 2GB and "3GB" levels (in quotes because it used 3.9GB) at 1680x1050. The 3GB test certainly killed the frame rate:

1GB test was 137FPS,
2GB test was 111 FPS,
3GB test was 37FPS

I'm a relatively new owner of the GTX 970 (Gigabyte Gaming G1 GTX 970, bought end of last month) but I'm getting mildly concerned about it after reading about this issue and some of the others on the Nvidia forum.

I would expect that filling the vRAM would cut the frame rate like that.
post #48 of 2990
I tried testing again with the most VRAM-demanding game I could think of: SpaceEngine. For those who don't know about it, it's a space exploration simulator currently in beta form with the ambitious (and awe-inspiring) goal of basically letting you fly around a universe, between galaxies, into solar systems, and to the surface of any celestial body you can think of and even now it loads in some impressive and far-reaching geometry and textures on planets and stuff. Oh, and it's free.

It always needs more VRAM and I feel like it always will because of how much trouble it gave my 780 before and now my 970 specifically because of the VRAM and time necessary to load in textures fully with max LOD settings. It's always loading new textures in and out because even a single one of countless planets or moons in this game can present far too much geometry and textures to fit in any video card's framebuffer at once. I messed around a bit, was able to briefly push it beyond 3.5 GBs (up to 3800 MBs) in some extreme scenarios, but on its own, it seemed to stabilize that down to 3.5 as if only temporarily using the additional space. It did seem to hang up more severely than normal past the 3.5 GB range, but I'm not placing too much value on that because SpaceEngine always stutters and constantly swaps things in and out of VRAM anyway. Here's a screenshot of a random planet I found and let my 970 sit and load for a while. It both demonstrates why SpaceEngine is so demanding and shows (upper right corner) where VRAM load tends to max out for me.






3585 MBs is only one more than 3584 exactly, which is 3.5 MBs. It tends to max out around there, give or take 20 MBs.







I also gave MSI Kombustor's 3GB memory test (which actually used all my VRAM) a shot to see if it would load into all my VRAM. It did, but I noticed something weird on the loading screen. The speed of the loading bar reduced when it reached ~3500 MBs. I repeated this several times to make sure it wasn't just a fluke and it happened each time. The loading bar's progress is at one consistent speed up to 3500MBs and another slower, consistent speed for the remainder. The bar actually details and illustrates how much it's filled up at any given time.






As for my card details:

Brand: Gigabyte
Model: G1 Gaming 970 SLI, Rev. 1.1
BIOS Version: 84.04.1F.00.FD and 84.04.28.00.4D
Driver Version: 347.09





That's all the info I need personally to prove it to myself, something funky is going on with my 970s' memory allocation. I really hope Nvidia at least say something about this, but either way I'm really regretting the SLI now. Should have just waited for GM200 and now I'm leaning towards taking a loss and selling both my 970s for one when it launches for a reasonable price. I'm definitely not going to get a cut-down GM200 though, I'm expecting, such a part to have weird memory issues too.
Edited by Serandur - 1/13/15 at 3:25pm
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post #49 of 2990
This may or may not have been questioned yet. But is it possible with the new architecture that the 970s just have a problem reading vram? So reading 3500MB would actually be 4GB and then it is over taxing the ram causing fps to dramatically drop?
post #50 of 2990
Quote:
Originally Posted by Serandur View Post

I tried testing again with the most VRAM-demanding game I could think of: SpaceEngine. For those who don't know about it, it's a space exploration simulator currently in beta form with the ambitious (and awe-inspiring) goal of basically letting you fly around a universe, between galaxies, into solar systems, and to the surface of any celestial body you can think of and even now it loads in some impressive and far-reaching geometry and textures on planets and stuff. Oh, and it's free.


Snip....
As for my card details:

Brand: Gigabyte
Model: G1 Gaming 970 SLI, Rev. 1.1
BIOS Version: 84.04.1F.00.FD and 84.04.28.00.4D
Driver Version: 347.09

Snip...

Have you by any chance tried with just one card? Some games / tests go past 3.5GB for me, but only when I disable SLI.
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