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Need help upgrading a graphics card in an old computer

Last response: in Graphics & Displays
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Hey everyone,

I'm trying to upgrade an older computer for my son, but am unsure how much to spend on a graphics card, because I don't know how much the rest of the system will bottleneck performance.

Here's what's there now:
Thermaltake 430W PSU
AMD Athlon 64 3800+ CPU
2 GB PC 3200 DDR SDRAM
GeForce 6600 GPU
Windows XP

I'm think about one of these cards (after reading the latest Tom's rankings):
Radeon 4650
Radeon 4670
Radeon 4850
GeForce 9800GT

Questions:
How much performance boost will I see with each of these cards?
Which cards will be bottlenecked?

Thanks for the help!

It's got a PCIe slot. The current 6600 is a PCIe.
So anything above a 4650 to 4670 is a waste of GPU then? Should I go with 512 or 1 GB?

Also, how much boost am I going to see going from the GeForce 6600 to a Radeon 4650 or 4670?
Graphics card Master

There is not huge difference in prices between the two TBH, so yes, grab a cheap HD4670, but do not be afraid of the 1Gb cards, that said, do not pay more for a 1Gb card either, the HD4670 is just not fast enough to use all that memory.
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