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Hey i have a 5777, a 5850 and a 7770.  i am running the mobo and the 5850 on one psu and the other 2 cards and all the fans on the 2nd psu, any 2 cards will work but as soon as i add the third card windows hangs during boot,  i can run the 2 cards on the main psu (520w) and it also works if i try all 3 it hangs so i figured it was lack of power now i added another psu (500w) i have gone as far as to try

1 card on the 2nd psu
2 cards on the 2nd psu
3 cards on the 2nd psu
all cards are independent but have tried sli and no dice

my best guess it it is a driver or something but all the drivers have been installed and are fully update

each sli spot has also been tested and like i said it is the 3rd card that kills it =(  

any recommendations would be AWESOME

thanks.

Is the motherboard designed to support 3-way Crossfire/SLI? Just because a board has three PCIE slots does not mean each slot will properly support a card, especially if you aren't using powered risers.

Also, as a personal recommendation, you shouldn't have two tiny power supplies. One large high quality power supply should be used to power this kind of setup.

ya the power suply setup is a concern for me to it is just what i had at the time.  so your saying that the pci-e on this board may not support a 3 card setup or that one of the slots may not support vid card?  cause i know all spots do support video but not sure if it can handle a 3 way (lol) never thought i should prolly check to see if there is a bios update...

i'll update the thread once i know

thanks

w00t BIOS update FTW thanks man