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Which PSU

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I am looking to buy a PSU today hopefully and was looking at this one, I need a PSU with and 8pin pci cable for my 9800 gt2 GPU. Is having only 1 12v rail a bad thing? Should I try and go with a modular PSU? Should I try another brand? My GPU requires 580W plus I have a hdd and fans and overclocked CPU.

Thanks for the hopefully timely advice.
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I just got an Antec Quattro 850W its really good and not the most expensive PSU on the market in that range. If you want cheaper look for PSUs in the Hiper range they are ultra cheap but you could never tell the difference between a Hiper and the same power rated PSU at twice the price.
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Are you talking about the 9800GX2? The one I found about 9800GT2 is that its from China or something.
If its the 9800GX2, then the Corsair 750W should be good enough for your needs.

Is having only 1 12v rail a bad thing?

Having a single 12V rail is better (from what I've heard) because the load is not divided and not isolated. (don't quote me on this though and wait for a tech to answer your question).

Should I try and go with a modular PSU?

Modular PSU is more personal preference than anything, its simply better for cable management so you don't have some unused cables laying around inside your case.
Corsair is one of the better brands, I don't suggest switching.
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