51C is not hot enough to cause problems. What PSU are you using, and what are the amps on the 12V rail? Also, try running memtest86, a link is in my sig.
Glassmaster.
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Power Supply Guide' ">http://www.hardforum.com/showthread.php?t=792566
Memtest86' ">http://www.memtest.org/#downiso
Prime95' ">http://www.mersenne.org/freesoft.htm
SuperPI' ">http://files.extremeoverclocking.com/file.php?f=36
3dmark05' ">http://www.futuremark.com/download/?3dmark05.shtml
CPU-Z' ">http://www.cpuid.com/cpuz.php#download <