I'm recently considering the option of swapping my EVGA Geforce 8800GT 512mb (@ 650 mhz core and 1900 mhz memory*) to a HD4870. My budget is anything under $300 and my motherboard is a P35 (so no crossfire). The resolution that I'm going to be playing at is 1680*1050 on a 22" monitor.
I'm in a dilemma as to whether or not I should upgrade, I won $400 from Vegas and figured I might as well spend some money to enhance my rig, but then there hasn't been any comprehensive benchmark tests that I could see how big the gap is between a 8800GT and a HD4870 at 1680*1050 resolutions.
Maybe I should upgrade my CPU as well, but then it won't be the bottleneck factor for my games.
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I think you can expect a 25-50% performance increase (see here). Most games don't max-out CPUs so I guess it can wait.
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Reply to Zenthar
The HD4870 is two tiers above the 8800GT on Cleeve's hierarchy chart. He suggests that any less than a three-tier upgrade isn't that big a difference. You might improve your experience in front of your PC in other ways. Consider a nice new highback chair, and/or a new computer desk. Do you have a UPS? How about a nice-sized external drive for backups? Other peripherals?
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Reply to jtt283
500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products.
For your current setup, I don't think that replacing your video card is a good idea. Depending upon the games and settings you use, at 1680x1050 you'd only see perhaps a 40-75% increase in performance; the higher end of that range is if you use AA in Crysis. Really, for that much money, I'd recommend just keeping your 8800GT for now; it certainly isn't showing much in the way of signs of age in games, now is it? I'm pretty certain the $300US would have a better-felt effect spent elsewhere, be it toward your computer or something else.
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