I'm using MBM5 with a 1.4 Athlon Thunderbird, and a ECS K7S5A motherboard. MBM5 is getting the temperature using board sensor Sis950/ITE8705-3. The ambient room temperature is between 70C and 80C. Running distributed.net client and Toast for about 10 minutes, I already get a "full load" temperature of 53C. Does this seem really high for this heatsink?