I just managed to reduce my already low temperatures by a couple of deg C. by propping up the CPU fan on to the vid card with a drinking straw cut to size (SK7 with a big 80mm *2.5cm sanyo denkii fan).
I noticed that I could fractionally move the fan and hsf upwards with my finger with very little pressure. I assume the weight of the fan and heatsink is causing a very minor droop and loss of contact between the HSF and CPU.
Anyway my XP2100 currently at 2236Mhz (11*203) on an 8RDA+ is giving me temps of 31/35.C (idle/load) whereas before it was 33/37.C)this is with a room temp of 20.C and a MB temp of 25.C. I do have case fans which directly duct room air into the CPU fan.
Anyway any of you peeps think this is a common problem with heavy heatsinks/ fans which only use the clips to hold them onto the CPU?