Problem is all the 100+ psu's you bought may not be qualified for overclocking.
Good discussion on PSU's:
http://forum.lowyat.net/index.php?showtopic=218930
[WTA] Overclockability drop with new PSU ?, War between my RM60, RM180 and RM475 PSU
Jun 28 2006, 01:30 AM
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