Hello, folks. Recently I have bought a shiny new Athlon II x4 635 (Stock heatsink and fan) and a Biostar A785G3 motherboard. It's using 2 sticks of 2gig G-Skill ram. My computer sits on my desk with an open side and a small box fan set up against it blowing out (my ventilation and cooling solution). When I first booted up the system, my temps were normal. The Cool And Quiet under clocked my processor down to 783mhz and it was running at ~29 C. Running Prime 95, it climbed to ~60 C. The sensors seemed alright then. After reading somewhere that Advanced Clock Calibration allowed better stability at lower voltages using the negative values, I thought I'd try it out and see if I could get my temps lower and keep my stability. I lowered the vcore down from 1.375 the motherboard had it set at to 1.34, set the ACC to -4% and ran Prime95 for an hour- no errors. And the temp reading I got from CPUID HWmonitor kept going DOWN, not UP. I thought this was VERY WEIRD. Eventually, it hit 0 C. Wait, my ambient room temp 21 C. How the hell? So... I thought- why not add a little overclock and see what happens. I pushed the FSB up to 207 (from 200, multiplier is 14.5) to make the processor run at a flat 3Ghz. Maybe I'd see a little increase in heat, maybe something realistic. Nope. Still 0 C. So, now I'm in the 9th hour of running Prime95 with the same slight overclock and lowered voltages and still, no errors, no heat increase. Has anyone else seen something like this? It's freaking me out- nothing is this this good, is it? But I have one other concern- CPUID HWmonitor is showing me a temp in my computer is high. The "ACPI" and TMPIN0" are both at 55 C. I'm guessing that's the north bridge of my Motherboard? I have the Radeon HD4200 IGP overclocked to 600mhz, I'm guessing that's the cause. What's a safe temp range for my North Bridge?