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Battlefield 4 poor performance

I bought a Sapphire 7790 in September in preparation for BF4.
PSU Corsair CX430
Intel Core i3-2120 2 3.30 Ghz
6 GB Ram

I've been playing Far Cry 3 at high settings, no problem. Unfortunately, in Battlefield 4 I have a very low framerate and experience lag every 5 seconds or so.
I'm pretty sure I have the latest Catalyst drivers, as the website says they were released before I bought my new graphics card (and installed drivers for it).

I will be patient for patches and new drivers, but I'm disappointed the game is not running well at all, even in Test Range and single player.
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  1. Best answer
    http://www.joystiq.com/2013/09/10/battlefield-4-pc-requirements-revealed-time-to-gear-up/

    Your system is below the recommended, and is actually closer to the minimum, you should be able to play on low, maybe medium depending on the resolution.
  2. I'm sorry, I forgot to say that I was experiencing all this even on low settings. My screen resolution is 1680 x 1050.
  3. Yeah that is pretty close to 1920x1080, the 7790 is more geared towards 768p. I would expect some lag at low on 1080p
  4. I found the problem: Another program (Folding@home) was using my GPU in the background, although somehow this hadn't affected my gaming performance until now.

    The game runs fine around medium now, even though the in-game ''system performance test'' still says I have 0 frames per second.

    Thanks for the help anyways.
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