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Vega's *Heavyweight* display and computer; edition 2012 - Page 38  

post #371 of 1300
Vega your builds inspire me thumb.gif

btw I was the one who commented on your youtube video about pines of rome lol
 
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post #372 of 1300
Quote:
Originally Posted by CallsignVega View Post

10% is huge! wink.gif

touche, forgot about your massive resolution/millions of pixels tongue.gif.
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post #373 of 1300
so guys, should I wait for 4gb version of 680's or go with 2gb version?im confuse..by the way thanks guys for the output!thumb.gif
post #374 of 1300
Thread Starter 
Well, the results of my PCI Express 2.0 versus 3.0 on my 4-way SLI GTX 680 FW900 Surround setup are in. The results are so incredible I had to start the tests over from scratch and run them multiple times for confirmation! eek.gif

Test setup:

3960X @ 5.0 GHz (temp slow speed)
Asus Rampage IV Extreme with PCI-E slots running 16x/8x/8x/8x
(4) EVGA GTX 680's running 1191MHz core, 3402 MHz Memory
nVidia Driver 301.10 with PCI-E 3.0 registry adjustment turned on and off for each applicable tes
GPU-Z 0.6.0

SANY0003-12.jpg


After PCI-E settings changed, confirmed with GPU-Z:

PCI-E20.gif

PCI-E30.gif


All settings in nVidia control panel, in-game and in benchmark, EVGA precision are all UNTOUCHED between benchmark runs. The only setting adjusted is the PCI-E 2.0 to 3.0 and back and forth for confirmation (Reboots obviously for registry edit).


PCI-ETests.jpg


I kid you not, that is how much PCI-E 2.0 running at 16x/8x/8x/8x versus PCI-E 3.0 bottlenecks BF3 and Heaven 2.5 at these resolutions. I attribute this to the massive bandwidth being transferred over the PCI-E bus. We are talking 4-way SLI at up to 10-megapixels in alternate frame rendering. Entire frames at high FPS are being swapped and PCI-E 2.0 falls on it's face.

The interesting part was that while running PCI-E 2.0, the GPU utilization dropped way down as would be typically seen if you are "CPU" limited. In this instance I am not CPU limited, nor GPU limited. We are really at a point now that you can be PCI-E limited unless you go PCI-E 3.0 8x (16x PCI-E 2.0) or faster on all GPU's in the system. GPU utilization dropped down into the ~50% range due to PCI-E 2.0 choking them to death. As soon as I enabled PCI-E 3.0, the GPU utilization skyrocketed to 95+% on all cores. I was going to run more benchmarks and games but the results are such blow-outs it seems pretty pointless to do any more. It may interest some of those out there running these new PCI-E 3.0 GPU's in which they think they are CPU limited (below 95% GPU utilization) yet might have PCI-E bandwidth issues.

Down to the nitty gritty; if you run a single GPU, yes; a single 16x speed PCI-E 2.0 slot will be fine. When you start to run multiple GPU's and/or run these new cards at 8x speed, especially in Surround/Eyefinity, make sure to get PCI-E 3.0. wink.gif
    
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post #375 of 1300
Sorry you have 4x gtx 680's hardcore bottlnecked by 2gb of vram.
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post #376 of 1300
Thread Starter 
Quote:
Originally Posted by Acefire View Post

Sorry you have 4x gtx 680's hardcore bottlnecked by 2gb of vram.

Ya, because simply changing PCI-E slots between 2.0 and 3.0 speeds will affect VRAM usage. Please tell me you are just trolling and not actually that stupid. wink.gif
    
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post #377 of 1300
Wow. Now someone needs to send you 4 7970s to see if x8 3.0 is even fast enough to make up for the 900MB/s CF bridge and everything running off the first card.
Edited by PoopaScoopa - 4/7/12 at 4:56am
post #378 of 1300
VEGA, since you have a RIVE could you do another simple test so I can put my mind at ease? I'm really interested if, in your resolution of 3600x1920 (close to mine 3840x1920 ) you see any difference from a single VGA in PCI-E 3.0 to 2.0 at 16X. Your tests make it very clear when multi-GPU is involved, but since you MIX multi-GPU and surround resolution I can't really dismiss the possibility of still running in a "worth upgrading" bottleneck with a single card. I guess you'll only need to flip the 3 micro-switches and in 2 reboots you can answer my question =)
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post #379 of 1300
Vega... nice tests!

I'm starting to wonder if my 2-way SLI is bottlenecked by having x8 2.0 for each card then... it looks possible (2560x1600). My GPU utilization is high (90%+) at almost all times in games though. Regardless, looking like a day-1 buy for Ivy Bridge for me to enable PCI-E 3.0 on my Z68 Gen3 board.

Is there any chance I could trouble you for a 2-way SLI run at 3600x1920 (PCI-E 2.0 vs 3.0)? Pretty please? That's most comparable to my resolution... though still far greater (4mp vs 7mp).
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post #380 of 1300
I'll make another post so this won't pass unnoticed in an edit. But just comparing the BF3 results in both resolutions It's pretty evident the role of the resolution in the bottleneck hence we go from 69 to 97FPS. But in the other hand I find the 133 to 140FPS a rather small increase in FPS considering the final resolution decrease. What are your thoughts about it VEGA? Is it possible that we are hitting some kind of "we are still topping the VRAM at 3600x1920, so due to memory swap we are unable to break the wall of 140FPS". Also please tell us the game settings you're playing on and the VRAM usage at 3600X1920! Those results are really making me change my plan to keep my non PCI 3.0 compatible Z68 board until the Z77 boards are priced right 2-3 months after release.
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