Optimal GPU for older Mobo

I have an older HP XW4400 workstation with 1.86GHZ Core 2 Duo, PCIe x16 (1.X), 460W PSU, 4GB RAM. It has some sort of Nvidia PCIe GPU plugged in. My son plays some non-taxing games (Left 4 Dead 2, Portal 2, Team Fortress 2, Amnesia - The Dark Descent). They play but not that great. How much GPU can I put in there without bottlenecking? I don't want to spend more than 50-60 bucks since this will be a stop-gap fix. I'm looking at an ATI Radeon HD4770 DDR5 512MB for 50 bucks shipped. Not sure if I should go for something DDR3 1GB or would that be kind of a waste in this system. Thanks.
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More about optimal older mobo
  1. Hi, I would go with a radeon 6750 as the 4x series is pretty outdated now. If you want to you could get a refurbished 4850 on ebay for a good deal(My brother got one for only 60$ and it's much better than a 4770). I would really try to get a 6750-6770 though.

    Hope this helped!
  2. Thanks for the reply. I realize the Radeon 4X series is outdated but then so is the computer. I also forgot to mention it is running Windows XP Pro with no plans to upgrade so the whole DirectX 11 support or whatever bells and whistles I can get with Windows 7 is immaterial and I'm not willing to spend 80-90-100 bucks to upgrade this crappy system. Just trying to find a balance point between improved performance and (low) cost. I'll probably end up spending the same money over again unless the kid gets a job! haha
  3. I agree lol, It would be best to just go with a 4770 then for that system. If you can try to get a 4830, that card can run all the games you listed above ;) and it might even cost less than the 4770. They are about the same in performance I believe!
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