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SLI & Crossfire


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#1 Megaman1

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Posted 15 November 2009 - 08:18 PM

Hi,

In the description of this motherboard it writes ■"4 x PCI Express 2.0 x16 slots (blue @ x8 / x16 mode, orange @ x8 / N/A mode)"....... Can someone Please explain to me what this means.


http://www.asrock.com/mb/overview.asp?Mode...20SuperComputer



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#2 RainbowSix

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Posted 15 November 2009 - 08:35 PM

When there are two graphics cards inserted, they should go into the blue slots and will run at x16. If there are four graphics cards, they will run in x8 mode each. I'm not entirely sure how three graphics cards would work though; they could be all x8 or there could be one with x16.

A slot with x8 has half the bandwidth of x16.

Edited by RainbowSix, 15 November 2009 - 08:42 PM.

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#3 Megaman1

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Posted 15 November 2009 - 08:44 PM

Thanks man, It makes perfect sense. :thumbsup:


But, it the specs provided in the link below, it writes "4 x PCI Express 2.0 x16 slots (blue @ x8 / x16 mode, orange @ x8 / N/A mode)" .............Does this mean that if if only One Orange PCI-E slot is being used it will run at x8 speed or not run at all???

#4 dpunisher

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Posted 15 November 2009 - 09:33 PM

Confusing.

If one blue slot occupied......X16.

2 blue slots occupied....... X16 and X16.

3 slots......anybody's guess.

Both orange slots run at 8X regardless.

All slots occupied, all slots run at 8X.

That board has 32 lanes to split up for the PCIE slots. It looks like the board comes with extra long Crossfire and SLI bridges to cover those gaps between blues.

EDIT: Found it ..... 3 way (woohoo) PCIE1 x8, PCIE2 x8, PCIE3 x16

Edited by dpunisher, 15 November 2009 - 09:41 PM.

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#5 RainbowSix

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Posted 15 November 2009 - 10:35 PM

Does this mean that if if only One Orange PCI-E slot is being used it will run at x8 speed or not run at all???

If only one orange PCI-E slot is being used, the other one will be disabled. Usually the instructions will tell you to use the top one and leave the bottom one empty.
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