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Join Date: May 2002
Location: Arlington, TX
Get a 5 series ATI card, the 4 series is a waste of money. The new 5 series is DX11 compatible, it's the very first set of cards that are, nvidia doesn't even have DX11 cards out. If you get that 4 series, it will be out of date in 6 months.
Your system is similar to mine, I have an AMD Phenom II 965 black edition processor, running on an MSI 790FX-GD70 AM3 motherboard. It performs well, but the weakest point is my harddrive (seagate barracuda 1.5TB) and my 8800GTX - about to upgrade to the 5870.
The best thing to happen to computers in the last 10 years has been SSD's. IF you have some serious scrilla, look into them and ditch harddrives all together. It's probably the biggest performance boost I've ever seen on a computer.