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Pci-e Gen. 1 in 2017?

post #1 of 6
Thread Starter 
Heres an article i found with bench marks, comparing the same, top of the line, fairly recent, hardware, tested in pcie-e 1, 2, and 3 modes. the motherboard allowed for manual setting of pci gen mode, allowing the exact same hardware to be compared, and test for bottlenecks. With 2 GTX 980's in SLI, and a Core i7 5960X, the most differences seen in real-time FPS was 13- from 148 to 160 FPS in Bioshock Infinite. Gains in non-sli averaged 3-6 fps- about the same performance gains you would see by overclocking a pci-e 1 bus to 135mhz.

http://www.guru3d.com/articles_pages/pci_express_scaling_game_performance_analysis_review,1.html
post #2 of 6
http://www.overclock.net/t/1625977/pci-e-lanes-bandwidth-in-sli/0_100
post #3 of 6
Quote:
Originally Posted by acheleg View Post

Heres an article i found with bench marks, comparing the same, top of the line, fairly recent, hardware, tested in pcie-e 1, 2, and 3 modes. the motherboard allowed for manual setting of pci gen mode, allowing the exact same hardware to be compared, and test for bottlenecks. With 2 GTX 980's in SLI, and a Core i7 5960X, the most differences seen in real-time FPS was 13- from 148 to 160 FPS in Bioshock Infinite. Gains in non-sli averaged 3-6 fps- about the same performance gains you would see by overclocking a pci-e 1 bus to 135mhz.

http://www.guru3d.com/articles_pages/pci_express_scaling_game_performance_analysis_review,1.html

That article is from 2015. Things have changed since then -- especially in SLI. There is at least one youtube video (done w/Titan X Maxwells) that documents the difference and it can be significant depending on the game
post #4 of 6
Thread Starter 
wheres the bottleneck? sharted system ram access? that was 1 card generation ago, the cards themselves havent gotten 4 times faster
post #5 of 6
Thread Starter 
the link to the 1080 x2 sli had interesting results. his FPS went UP about 7% when he used pcie-e x8/x16, as opposed to pci-e x16/x16. it should have gone the other way. but he was dealing with shared slot bandfwidth, and a ssd in another pci-e slot.

the sequential read doubled on the hard drive when he went from gen 2 to gen 3 pci-e, but all else varied less than 10%. ive nothced that with my solid state drive on sata, the sata generation can also hit sequential read hard, but all else stays relatively the same, but my post was more about video card performance than hard drive performance- but it is important to note that ssd's "burst" speed can advantage from pci-e gen 2 and 3, or 6gb sata.
Edited by acheleg - 4/29/17 at 3:11pm
post #6 of 6
Quote:
Originally Posted by acheleg View Post

wheres the bottleneck? sharted system ram access? that was 1 card generation ago, the cards themselves havent gotten 4 times faster

https://www.youtube.com/watch?v=rRyFGoDVr28

More than 10% difference in minimum FPS in Witcher 3 w/SLI'd 980Ti's when going w/PCIe 2x16 over 2x8. More than 50% difference in BF1.
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