So I just built a new system for myself and I have been running prime95 to test out some overclock settings and using speedfan to watch my temps. Occasionally when I come to check on it, Speedfan is toggling in-between two different temps for 'system' and 'cpu'. IE, cpu will show the (real) temp of 63 C, and system will have its real temp, then a few seconds later they will both switch to bogus negative numbers (of a different value), then switch back a few seconds later. This goes on forever until I open a menu in speedfan or restart it.

Has anyone ever heard of this happening?

The system in question is an i7 920 on an asus p6t.

I have never heard of this happening before, i would not worry though. blame it on speedfan and try a diffrent temp monitor.

The old pentium 4 thats been running for years in my bedroom reads a core temp of -136 degrees in speedfan..