Currently I have a 2500k @4.5 and MSI 560ti ocd 925/1850/2070
Case is CM 2 690 2 advanced
CPU Cooler AKSA Venom Voodoo dual fan with arctic 5 silver
Temps idle: CPU:32 GPU: 32
Temps Prime small fft: CPU: av 68
Temps IBT: CPU High 70s/ touched 82 in one core after an hour of Max Ram
Gaming [BF3/ARMA 2] CPU: 55 - 63 GPU: 62 - 65 [72 max in Arma 2]
Currently my system is similar to tom's guide below, with an extra pull fan on the heatsink and the GPU pulling air in from below the psu and blowing out the back of the case.
When i take the side of the case off the temps reduce by 5 or 6 degrees.
Would 2 extra case fans blowing air up from the bottom[between the PSU and HDD racks], another 120mm fan pulling air at the top of the case and another 120mm fan [pushing or pulling- not sure which] from behind the heatsink clamp on the back of the motherboard at the otehr side of the case, help bring temps down a few degrees?
Since cooling is better with the side off, you have verified that cooling can be improved.
1) Do not count on the psu for cooling anything but itself.
2) The weakness I see is insufficient cool air intake. If you can add an intake fan on the bottom or front, good. If you can't, then you will have to increase the cfm of the single front intake fan. That meand higher rpm fan, or perhaps a 38mm depth fan.
3) The cpu cooler can do no better unless it gets a better supply of cool air. A second push/pull fan would give you only marginal better results.