I would say that PSU isn't sufficient and your description of your problem makes that all the more apparent. Upgrade the PSU to a non-Vanilla Tagan / OCZ / PCP&C / Other reputable named brand.
Simplest test... borrow a better PSU, and if that doesn't work, hang an extra 80mm fan beside the card blowing over the ram as memclocks seem to be suffering the most.... also, check contact / thermal compound used for the VGA Silencer contact against ram...
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