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A question for The Wiz. When looking at the bios, did you notice anything relating to nvidia only cards running in the 16x pcie slots?
I only ask because I also have the M59SLI-S5 mobo, and I purchased a new 5850 graphics card to run in it and if I install the 5850 in either of the blue 16x pcie slots the PC will not post at all, but if I put the 5850 in the 8x slot the pc posts and boots without any problems?
I suspect there is some type of SLI setting in the bios that is blocking non nvidia cards from running in the 16x pcie slot - or possibly a power limit setting that is specific to the 16x pcie slots that is not present on the 8x pcie slots.
Is it possible for you to take a look and see what you can find?
If it is not a power limit, perhaps it is a pcie channel limit of some sort? From what I read, the M59SLI-S5 mobo only has 30 pcie channels, and maybe the mobo is not splitting the available pcie channels up properly or in a way that ATI graphics cards support?
Lastly it possible to set the 16x pcie slots to 8x within the bios? If the 16x pcie slots were limited to 8x, then I could run 3x graphics cards at 8x each (24 pcie channels total).
I will be using this mobo for folding, so I would like to run 3 graphics cards in it.
You help is greatly appreciated.
Thanks.