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Have an HP m8100n with one available PCI-e x1 and one available PCI-e x16 slots. Wanting to upgrade to GeForce 8800GT but all the video cards I find at Newegg, for example, show that they are PCI-e 2.0 x16 cards. Do they still make just PCI-e x16 cards? Will the 2.0 cards work in my computer? Also, need to upgrade my PSU. Will one with 550 watts be sufficient? Thanks for the help.
 

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Welcome to tsf. You better stick to a pci-e 1.0 card if your not sure. Pci-e 2.0 cards only work in pci-e 1.1 slots or 2.0 . If your pc does not have the 1.1 revision it will not work. So you might be safer going with a 1.0 card.

Also you will need a quality power supply 600w or higher (550w not enough) with 26 amps on the 12v rail. Stick to brands like antec , thermaltake , and corsair. Its should cost you a minimum of 60 to 70$
 
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