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Old 04-15-2010, 12:58 PM   #1 (permalink)
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Default x16/x4 vs x8/x8 (or "which mobo do i buy"?)

This question is about video cards and mobos.

Is there a significant performance difference crossfiring on a mobo with x16/x4 PCI Exress 2.0 slots vs. x8x8 slots? If it matters, the cards will probably be 5850s (maybe 5770s though if I run out of money).

I would especially appreciate links to any kinds of testing done. While I value informed conjecture, I'd rather see some numbers.
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Old 04-15-2010, 01:17 PM   #2 (permalink)
 
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Default Re: x16/x4 vs x8/x8 (or "which mobo do i buy"?)

The x4 PCI Express will bottleneck those cards so choose the x8x8 mobo.
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Old 04-15-2010, 09:09 PM   #3 (permalink)
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Default Re: x16/x4 vs x8/x8 (or "which mobo do i buy"?)

What motherboards are you looking at? what socket and price?
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Old 04-15-2010, 09:19 PM   #4 (permalink)
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Default Re: x16/x4 vs x8/x8 (or "which mobo do i buy"?)

Out of those two configurations, definitely x8x8
You shouldn't see that much of a performance hit.
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Old 04-15-2010, 11:57 PM   #5 (permalink)
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Default Re: x16/x4 vs x8/x8 (or "which mobo do i buy"?)

Quote:
Originally Posted by farinha View Post
The x4 PCI Express will bottleneck those cards so choose the x8x8 mobo.
I'm wouldn't say I doubt the truth of this statement, but like my OP says, I'm interested in numbers. If indeed it would bottleneck, I would like to know how much. Am I just going to lose a few frames, or is it going will my second card only be running at half power for instance?

Quote:
Originally Posted by Apok
What motherboards are you looking at? what socket and price?
Ideally something under $150, the cheaper the better. I know some of the mobos with 3x PCI Express 2.0 slots have at least 2 of them running at 16x, but they usually cost more than I want to spend.

I'm going to be embarrassed to say I don't know the nomenclature that well, but my processor will be an i5 750 (is that LGA 1156 socket?).
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Old 04-16-2010, 12:19 AM   #6 (permalink)
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Default Re: x16/x4 vs x8/x8 (or "which mobo do i buy"?)

Newegg.com - MSI H57M-ED65 LGA 1156 Intel H57 HDMI Micro ATX Intel Motherboard
Newegg.com - MSI P55-GD65 LGA 1156 Intel P55 ATX Intel Motherboard

both those are < $150 after MIR
both support Crossfire at x16x16

I'd go with the second one.
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Old 04-16-2010, 07:23 AM   #7 (permalink)
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Default Re: x16/x4 vs x8/x8 (or "which mobo do i buy"?)

Second SOULphiRE's recommendation, the new msi series of motherboards are good at the budget end. To the OP, it's too hrd to provide numbers as no trusted reviewers test on a limited platform, all will use full 16x while testing dual gpus. However in previous generations and forums members who have tried around forums it has been proven that 8x on the second card does not make too much difference with current gen cards.
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