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TEST: 6950 2GB PCI-E 2.0 x16 vs x8 + CCC OC

post #1 of 7
Thread Starter 
Hi everyone, I have been wondering if my 6950 would be bottlenecked when put in a PCI-E 2.0 x8 slot, so I decided to make a short test to find out and let you guys know as well.
I'm sure that it has been done before on different systems, but I wanted to see the numbers on my machine.

I chose the Unigine 2.5 DX11 benchmark for the test and ran the benchmark 4 times for each configuration.
For two of the configurations I overclocked the card via CCC, but didn't increase the voltage or anything else.
Used the latest non-beta AMD 11.12 drivers.
*Sig rig, 2500K@4.0
*1920x1200

I split the test into 4 different parts:

1) PCI-E 2.0 X8 | 6950 800/1250
201

2) PCI-E 2.0 X8 | 6950 840/1325
201

3) PCI-E 2.0 X16 | 6950 800/1250
206

4) PCI-E 2.0 X16| 6950 840/1325
215


As you can see from the results, the average average (lol) FPS and the maximum FPS are basically the same.
Although when looking at the minimum FPS, which, as most of us know, affects the playability the most, we can see that the difference is ~4% between the X8 and X18 PCI-E lanes' results.

Another interesting note is that the card possibly started underperforming considering the min. FPS when overclocked (without raising voltages), although the max FPS increased.
Edited by Karlz3r - 6/21/12 at 12:16pm
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Nerfed
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post #2 of 7
At 900MHz I experience what seems like a bottleneck. I can't get any improvement past 900MHz when overclocking. The system runs stable, but no performance increase. I have two video cards right now, one for gaming and one for CAD. When I get a chance I might try and pull the CAD card and see what x16 results.
post #3 of 7
Excellent benches, thank you.
post #4 of 7
great benchmarks. REP for your great work smile.gif

also if you guys want to see this.

http://www.youtube.com/watch?v=NFMzRZqFh-w

and

http://www.youtube.com/watch?v=rSfifE2Domo
    
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post #5 of 7
I wish someone would try it at 5760x1080 and see the difference...
    
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post #6 of 7

We had this discussion recently here post #31. For Eyefinity, it does matter from x8 to x16 Crossfire performance. Lower resolution 2560x1600 is a non issue.

 

There was a test by HardOCP, anything beyond 2560x1600 will see performance hit from x16 to x8. For Eyefinity resolution, the amount of data from 1920x1080 to 5760x1080 is 3x per frame. So if you are running two cards in SLI or Crossfire, one card @x16 and one @x8 is definitely going to introduce stutter or micro-stutter. 

 

This test was with PCIe 2.0. Will be interesting to see review with PCIe 3.0 @x8 Vs. @x16 Crossfire/SLI high resolution Eyefinity or Surround.

 

Conclusion GTX 480 SLI PCIe Bandwidth Perf. - x16/x16 vs. x8/x8

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post #7 of 7
Thread Starter 
I'm glad you guys liked the benchmark, thanks for the good comments.

Indeed it would be interesting, Ken, but I would never have the funds to afford such setups. biggrin.gif
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