1)I didnt removed the cooler to clean the CPU, i dusted everything including heatsink with a brush.
Well I urge that you remove the heatsink off the processor, clean the old
TIM [use alcohol OR after-shave] off and then reapply a good reputed TIM [
Arctic Silver5 and Tuniq TX2] are two good options, although if these are not available try to get the
Cooler Master HTK 002 minimum.
For how to this -->
http://www.bit-tech....all-about-tim/1 /
http://www.techpower...verclocking/134.
2)I have 1x120mm fan in very front near HDDs, 1x120mm on side window ( to provide cool air to my GPU), My Corsair PSU fan is just above the CPU ( i never check if it thrusts in air or out) as well as a 120mm Fan at the rear which thrusts out warm air. Plus there is a fan on GPU as well as my stock cooler. so, to cut the whole story short, i think its a positive arrangement.
It is dumping its hot air right onto the processor, so that is your main culprit. Just reconfirm once by placing your hand there once while the PC is operational. If it the case on confirmation, I cannot really do anything, as you will have to buy a new cabinet with a bottom mount provision for the SMPS to not any real change in temperature.
3)I live in bareilly )250kms from delhi and have hot summers comparatively a degree or two lesser than new delhi.
I am living in Delhi current Sire, have lived in Bareilly Cantt a long time ago. It is currently as hot as ell here in Delhi.