What, you got the processor running at maxed out, oohh 1.1ghz ?????
You most certainly aren't dumping alot of heat, ie. low overclock, with a "drive bay"radiator....
I have been using thermaltake(Bigwater cooling system's) on two rig's for about 8 month's.Temp's are very low and I am overclocking the crap out of both of them!!! Use copper only(NO MIXING WITH ALLUMINUM?)and remeber to change the fluid and hose's every three month's.This is key to cooling system's life span!