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GTA IV : how well it can be played on a HD 5770 vs GTX 460

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What is your CPU? That also makes a difference. GTA IV is optimized for quad-core CPUs, although tri-cores seem to do fine as well.

The 5770 or GTX 460 should be fine. I myself play with a 5750 and I get around 40-45 fps, but I also have a quad-core CPU (AMD Phenom II X3 720 BE with the 4th core unlocked).

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Then you're going to have issues. That is what I used to have (I'm assuming it's the dual-core).

I was lucky to get 20 fps on that and I had a worse GPU than you: HD3870. When I upgraded to my current CPU (AMD Phenom II X3 720BE), my fps jumped to around 35 fps. When I then upgraded to the 5750, I was getting an average of 40. With my over clocking, I'm around 45 now.

So, I don't know how well a 5770 will work with the 4200+. My guess is, not much. You might get better FPS than I did, but I don't know.

You really need to upgrade your CPU to a tri or quad-core CPU because GTA IV was written to take advantage of the extra cores. Dual-cores just don't cut it very well with this game.

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Just recently installed and been playing GTA: Episodes from LC from my MSI 460 Hawk, no OC, and get around 40fps. I'll check when in front of the machine to confirm. Sorry, no experience with the 5770. Other specs listed in sig.

One thing to remember about episodes is they've optimized them better than the original GTA IV.

Also, for GTA IV, download the latest patch for it. I believe that will bring it within the same realm as the Episodes releases as far as optimization goes. It definitely gives you finer control over the details.

But in the end, I still believe that the 4200+ is going to limit you. You really need to go to an Athlon II or Phenom II with at least 3 cores to really get acceptable performance.

I think the news side of Toms Hardware has a line up of video cards that shows the relative power of each compared not only to just nVidia and ATI but also desktop and mobile video chip sets.
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