• Issue with new GPU preventing post
    4 replies, posted
UPDATE: Tried it in a friends computer and it worked fine there, unfortunately for me it seems that this means the problem is somewhere else. Ok, so I recently upgraded my GPU from a 8800GTS to a HD 5850. When I try to boot it, 4/5 times it tries to boot (fans spinning, dvd drive/HD working, etc) but it doesn't post. Occasionally, I'll get past the post and the system will boot up and windows will load fine. Once it gets past the post, the system works fine. I originally thought that it was a PSU problem, but after ordering a new PSU the problem is still there. When I replace my new card with the old one, the system posts and boots fine. I'm not sure exactly on the PSU requirement differences, but I tried booting with a friend's 6850 and it worked fine. My question is: could a faulty GPU prevent post sometimes but work fine once it posts? It really seems like a PSU problem but the PSUs I had were 700w and 750w respectively and the card only says that it requires 500w. Again, what I've tried: Old PSU + New GPU = Problem New PSU + New GPU = Problem Old PSU + Old GPU = Works fine New PSU + Old GPU = Works fine New PSU + Friends GPU = Works fine I plan on trying the new card in his system later today. The rest of my specs: Motherboard - [URL]http://us.test.giga-byte.com/Products/Motherboard/Products_Overview.aspx?ProductID=2553[/URL] CPU - E6600 overclocked to 2.7ghz 4 Sticks of Ram New PSU - [URL]http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006[/URL]
The NForce 680i SLI chipset has PCIe 1.0 slots, while the ATI HD5850 is a PCIe 2.1 card. There are known incompatibilities when using newer PCIe cards on the older 1.x specification slots, like the issues you're having with boot failure. I'm afraid if a BIOS update on the motherboard doesn't fix the instability issue with the HD5850, then you're out of luck getting that configuration working. the only option in this case would be to buy a new LGA775 motherboard with a more modern chipset (P35/45) that supports PCIe 2.x slots.
Well, have you tried all three of the PCI-E slots?
[QUOTE=Shadaez;28600830]Well, have you tried all three of the PCI-E slots?[/QUOTE] It doesn't matter which PCIe slot he uses, they're all 1.0 spec lanes from the NForce 680 chipset.
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