Ran out of ideas HELP!!!

ovekegres

Honorable
Feb 8, 2014
2
0
10,510
Hi Guys
Really need some help on this one as I've run out of things to try.
Spec as follows:-

Coolermaster Cosmos S tower
Intel I7 2600k 3.4ghz (running a 4.0 gig)
16gb corsair vengeance 1600mhz ram
Nvidia GTX580 1.5g video card
Corsair H60 Hydro series
300GB VelociRaptor 10000RPM SATA-600 32MB 3.5"
Corsair Adrenaline cache 60gb
3 x 120mm exhaust fans (top of case)
1 x 230mm intake fan (side)
1 x 120mm exhaust fan (front)
2 x 120mm PWM 2300rpm fans either side of H60 radiatior on push pull config)
Corsair 850w power supply

I built my machine about 2 and half years ago and have never had any issues with it as regards temperatures until recently. I do a lot of flightsim (Fs9) and thus built the machine around the requirements of the sim. I've had the CPU overclocked at 4.5ghz and idle temps have always been around the 22-25c mark and when running flightsim they have always held around the 43c mark until last week when idle temps went to 35C and when running flightsim the temps were running at 65c then went to 72c and I got the dreaded warning sign in the bottom corner of the screen saying the CPU temps were too hot. I have tried replacing the fans either side of the radiator and have re applied fresh thermal paste to CPU,also I lowered the clock speed down to 4.0ghz which have helped but the temps are still getting to around 62c. I'm at a loss really as to what to do next, as I said earlier my temps have always hovered around 43c and i'm not running anything different now than I have been for the past two years, i really need some help on this one as i have no idea what to try next.
Thanks