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Old April 10, 2012, 12:54 AM
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Default GTX580 Bottlenecking

Hi All,

I was just thinking of a dilemma on a new build I am building.

1.) Are there any bottle necking observed when running 2X GTX 580 in SLI on a Z68 motherboard (Considering that you are running both cards on PCI 2.0 8X speeds)?
2.) I am planning to build my new computer with the new Z77 motherboards and the new I5 chips which runs at PCI 3.0 (therefore, perhaps i should get a GTX 680).

If there are no bottle necking effects, i might just go with option 1 and save extra money.

Thanks all.
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Old April 10, 2012, 01:33 AM
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There will be maybe 3-5% of a bottleneck using PCI-E 8x, if you're really concerned about PCI-E bottleneck you can try to find a board with an NF200 chip (if there are any on z68)
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Old April 10, 2012, 03:59 AM
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Oh really? 3-8% is a low lower than i thought.
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Old April 10, 2012, 04:04 AM
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SLI Using Dual PCIe 16x vs 8x - How Much Bandwidth is Needed? Linus Tech Tips - YouTube
That is exactly what you're wondering.
This is with x58 BTW, but same rules apply with any other pci-e 2.0 board without an NF200 chip.
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Old April 10, 2012, 07:25 AM
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My vote is with the single 680. Half the components is 1/2 the things to go wrong, and the 680 rules.
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Old April 10, 2012, 07:47 AM
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Quote:
Originally Posted by Masteroderus View Post
My vote is with the single 680. Half the components is 1/2 the things to go wrong, and the 680 rules.
Totally agree with him, that single beast can do even slightly better than 590!
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Old April 10, 2012, 11:40 AM
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Interesting. What's the fastest card you can sue that won't bottleneck on an X48/PCie2x16?
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Old April 11, 2012, 09:22 AM
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Surprisingly enough, in an article by HardOCP it was shown that (at least for the GTX 480) there is not even a particularly large bottleneck at PCI-e 2.0 4x:

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

I agree on the GTX 680 being the best choice right now. Even with similar same average frame rates, games still play more smoothly on a GTX 680 vs. other cards. Might be the Adaptive Vsync, or it might just be the higher minimum FPS and more consistent performance, but it's really a difference you have to see and feel first-hand. Also, you'll save yourself several hundred watts of energy over an SLI 580 Setup. In PCP's live review of the Galaxy GTX 680 in SLI, the entire machine pulled just 500W from the wall with 2 680's and a Core i7.
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