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GPU Help

E

enny001

macrumors member
Original poster
Apr 30, 2013
77
0
HI guys i have Radeon 5770 in slot 1starting from the bottom and gtx 770 then gtx 550ti 770 powered by external power source my mac will boot up and i hear windows logo but nothing comes on my screen dell u2410. Everything works nice when 550 is out any ideas why is it doing this?

i have mac pro 2009
Thanks
 
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