CPU Bottlenecking my PC?

I put this in the most general category I could find.

Recently, I've been playing a lot of games on my PC. I need to stick around 125 FPS to do decent at these games, so I lower my graphics settings and such. The problem is that one day it'll be steady 125 FPS all the time, but the next day it'll be fluctuating from 30 to 125.

My PC Specs:

600W Thermaltake PSU
Nvidia GeForce GTX 560 Graphics Card
Gigabyte AM2 NF4-SLI M55SLI-S4 Motherboard
AMD X2 AM2 ADO 65W Processor
500GB Western Digital HDD(recently replaced)

Is it possible that my CPU could be holding all my other components back? This used to be a pre-built computer, so the old HDD and processor/mobo came together, and the HDD died. Any help would be appreciated.
4 answers Last reply
More about bottlenecking
  1. Yes your GPU can do a lot better with more modern CPU!
  2. Ok. I've been suggested an Intel i5 2500K at least. Any reccomendations for CPU?
  3. I5 2500K and a Z77 or Z68 board! Best value for gaming today.
  4. Thanks for the help! Appreciate it :)
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