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[Youtube] PCIe 16x vs 8x vs 4x With HD 6990 - Page 3

post #21 of 34
Quote:
Originally Posted by PoopaScoopa;13106913 
Interesting. The other reviews people have been posting from [H] and Tom's showed <1 - 2fps difference between x16/x16 and x8/x8. Not sure what was causing those problems with P67.


Here's another recent thread on the topic: http://www.overclock.net/hardware-news/988678-thg-p67-x58-nf200-best-platform.html


Some older [H] testing:


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

GTX 480 SLI PCIe Bandwidth Perf. - x16/x16 vs. x4/x4

Remember though I have to frame-swap images over three times as large as 2560x1600 between the cards in SLI. That puts a lot of bandwidth over PCI-E and the SLI bridge. In my testing with Tri-Quad 6970s on all 8X slots it could not even handle it and the crossfire bridge could not keep up until I lowered the resolution.
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post #22 of 34
Quote:
Originally Posted by Domino;13105636 
Are you even able to legitamately state "essentially two Xfired 6970s running in 2x 2x."?
xfire.gif

rolleyes.giffacepalm.gif
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post #23 of 34
Quote:
Originally Posted by CallsignVega;13107204 
Remember though I have to frame-swap images over three times as large as 2560x1600 between the cards in SLI. That puts a lot of bandwidth over PCI-E and the SLI bridge. In my testing with Tri-Quad 6970s on all 8X slots it could not even handle it and the crossfire bridge could not keep up until I lowered the resolution.

I wonder if you couldn't see any improvement with PCIE-3.0 either. Maybe that's why the GPU usage drops so much on some of the cards at certain moments in your videos.
post #24 of 34
Yeah, for some reason my GTX285 is stuck at 8x on my board even though my board is 16x....but it doesn't seem to effect performance in the slightest.

I stopped caring and for good reason too.
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post #25 of 34
this is complete BS, let me tell you why

this was tested in actual games about a month ago, and going to 4x decreased performance by about 25%

get off my level son biggrin.gif
post #26 of 34
This is funny, I actually completed testing on my 2 6990's in both x16x16 and x8x8 @ 2560x1600 yesterday. I used 3Dmark11, Vantage, Heaven 2.5 at both stock and Extreme or maxed settings and found the same to be true. I can post the results if anyones interested. Also can run any game requests.
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post #27 of 34
Linus did a video like that but using Nvida cards, results was just 1 score diff..
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post #28 of 34
Pointless using the 6990 as most of the GPU<->GPU data sharing is handled by the on board switch chip and not over the motherboard PCIEX lanes.
post #29 of 34
Quote:
Originally Posted by scatteh316;13108931 
Pointless using the 6990 as most of the GPU<->GPU data sharing is handled by the on board switch chip and not over the motherboard PCIEX lanes.

This is true. I found that when in x8x8 mode, gpu-z still read them running at x16 speed. I also figured this was likely due to the bridge chip that links the 2 GPUs on each card. Everest (or rather AIDA64 now) confirmed that they were actually running in x8.

I decided to run the test because I wanted to see if when using my OCZ Revodrive X2, which is an x4 device, if it would influence my performance. For testing I hooked up two of my old Raptor drives in raid 0. I'm still within the 30 day return window on the revodrive and was thinking I would switch over to two Vertex 3 drives if it was an issue. I am glad it didn't give me a performance hit, at least anything to worry about, because I love the speed of the revodrive and would hate to give it up.
Edited by ]\/[EGADET]-[ - 4/13/11 at 6:41am
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post #30 of 34
Quote:
Originally Posted by ' 
\/[EGADET]-[;13108990']This is true. I found that when in x8x8 mode, gpu-z still read them running at x16 speed. I also figured this was likely due to the bridge chip that links the 2 GPUs on each card. Everest (or rather AIDA64 now) confirmed that they were actually running in x8.

Both GPUs on the 6990 were running at x8/x8 when in x8 PCIe slots? Shouldn't they both be at x4/x4 ?
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