[CPU] High CPU Usage, Low FPS

I've had my rig for almost a year and a half now with no issues up until a few months ago one of my RAM modules crapped out so I had it replaced (Just ONE, not both). Once I put the replacement in things seemed to be running fine, even while I was waiting for the replacement with just the one module (2GB) I was able to play games without any issue, just couldn't run too many other programs at the same time. Now all the sudden I'm having frame rate issues while playing League of Legends. My CPU usage spikes anywhere between 35% and 75% which is obviously way too high, but my RAM usage stays around 1.5GB (out of 4GB).

I know that League is a very process heavy game, but I've never had this issue, even at half RAM. Does any one have any suggestions? I've tried a disk cleanup, defrag, memclean, re-seating the RAM, running Game Booster to cut unnecessary processes while playing game, but nothing seems to be working.

MSI P67A-GD65 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core
GeForce GTX 460 (Fermi) Superclocked EE 1GB 256-bit GDDR5 PCI Express 2.0 x16
G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
Seagate Barracuda 1TB 7200 RPM SATA 6.0Gb/s 3.5"
Antec BP550 Plus 550W Continuous Power ATX12V V2.2 80 PLUS
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  1. Its plausible that the memory settings in the bios have reverted to a lower setting.
  2. Heavy CPU usage, but a drop in FPS?
    have you considered the possibility that there is another process running that is uses a lot of CPU time, perhaps even a virus?
    (even if u can't see any kind of unknown process runinng, as a lot of virii are able to hide them selves)
  3. I checked BIOS, everything is where it should be in terms of settings. I've run a virus and malware scan and that came up clean. I did open it back up to check the seating on everything and noticed the CPU Heatsink was not properly seated on one side, it's properly seated now and seems to be working, but we'll see what happens after a few days of use.
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