What is the desired temp range for an Athlon XP 1900+? I've searched and searched and can't seem to find a straight answer. I was running at 45C and thought I'd improve by adding silver grease, now it runs at 50C-53C. My Athlon 64 runs at around 30C, so I thought I'd be cute and get the 1900 down a bit. I have just a stock-type fan/heatsink, but if these temps are okay I'll get over it.