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2 video cards = boots fine. 3 video cards = DOES NOT BOOT; hangs at POST

Last response: in Graphics & Displays
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December 5, 2009 11:58:20 PM

Here are my specs.

-MSI X58 Pro-E Motherboard
-Intel Core i7-920 2.66Ghz 8M LGA1366 CPU
-Corsair 4096MB PC12800 DDR3 1600MHz (2x2048MB)
-(3) XFX GeForce 9500 GT 1GB PCIe
-Seagate 250GB Serial ATA w/NCQ 7200/8MB/SATA-3G

The 3 video cards are not in SLI. The system boots fine when I have two of the video cards in, but when I add the third card in, it hangs at bootup at the POST screen. Any help would be appreciated.

I'm building this for a friend and need it completed quickly so I need help ASAP.

Thank you :) 
a b U Graphics card
December 6, 2009 1:41:28 AM

List PSU. Could be your PSUs too weak.
December 6, 2009 1:45:25 AM

Sorry. Forgot that. :/ 

Coolmax RM-850B 850W Active PF Power Supply
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December 6, 2009 1:53:23 AM

Is there any reason you want to run 3 9500GT card, for 6 display output? If it's for performance 3 of that should give you a little less performance than a 9800GT. IOW that setup is ridiculous.
December 6, 2009 1:55:12 AM

This was requested from my friend for me to build. It's not a gaming rig. Wanted to display 3 monitors on 3 separate video cards.
December 6, 2009 2:02:02 AM

This was requested from my friend for me to build. It's not a gaming rig. Wanted to display 3 monitors on 3 separate video cards.
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