[Solved] Framerate is choppy/stuttering

SPECS:
Nvidia GTX 560 (Non-Ti) (Latest drivers installed)
4GB RAM
Windows 7 x64 Ultimate
AMD Athlon II 645 3.1 GHz Processor
PSU ANTEC NEO ECO 520W (new)


Those are the basic specs. My problem is that every game I play, (this happens with all games, but it's not as noticeable on low-spec games) my framerate stutters, before it ran on a constant 60+ FPS but now it just drops to 1 for about a second, then continues to run at 60. It happens when I move my mouse around alot on a high sensitivity, but it also happens when something intense goes on (screen shaking from getting shot at, ex. BF3 taking shots and dying).

My computer -should- be able to handle most games. I know the PSU isn't the issue, in fact it fixed it alot more than my old 475W PSU. I applied thermal paste to my CPU, which helped slightly by reducing the drops a bit more. I do -not- have a really good internal hard drive (I didn't build my own PC, I bought it and just changed the hardware. I regret it.) and I heard buying a new "RAID" hard-drive fixed the problem, but I just need someone to confirm it or identify another fix.

You're CPU could be bottlenecking your GPU, and your CPU is struggling to keep up, needing a "1 second break" everytime that *** gets intense, I would say it is probably your CPU. might need to upgrade, just out of curiosity what is your PING when this thing happens, maybe it could be lag?
Happy Gaming!!!
AceD

Check the temperatures.
If any of the parts of overheating they n tone down the performance in order to cool down.

One of the things you'll notice in BF3 is when you get that severe stutter, there will be a specific set of sounds causing it a lot of the time. This is because BF3 attempts to make use of more than 2 cores. A repair installation might fix the stutter, but the performance will still be cut in half, literally, with a x2 processor.