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Couple SLI Questions

Forum Graphic & Displays : Graphics Cards - Couple SLI Questions

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clutchc   04-22-2009 at 09:33:05 PM

For a couple years I have been running 2 8800 GTS 320MB cards in SLI on my Asus 650i Mobo (x8 x8). I've always wondered about a couple things...

1) When I disable SLI in the Nvidia Control Panel's Set SLI Config, is the one lone card still running in PCI-E x8 or does it revert back to x16?

2) When SLI is disabled, does the primary card make use of the other card's GDDR memory through the bridge cable?

Thanks

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invisik   04-23-2009 at 12:02:54 AM
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1) Yes, if that PCIe slot supports x16 "single"
2) The bridge cable makes the card communicate together not the memory.

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clutchc   04-23-2009 at 12:58:39 AM
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invisik wrote :

1) Yes, if that PCIe slot supports x16 "single"
2) The bridge cable makes the card communicate together not the memory.



Thanks invisik.

1) But does that means my graphics card remains at x8 because the Asus mobo has a 'card' between the PCI-E slots that needs to be flipped when one changes from SLI to non-SLI config on the mobo itself?

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invisik   04-23-2009 at 01:15:27 AM
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Your PCIe will automatically lock at x8 when two graphic cards are detected on the slots.

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clutchc   04-23-2009 at 02:22:59 AM
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invisik wrote :

Your PCIe will automatically lock at x8 when two graphic cards are detected on the slots.



Ah! So it doesn't matter what position the selector card is in... single video card position or two video cards position? The PCIe slot determines the bandwidth. Thanks.

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