Get a new PSU and then re-test. With amperage that low I wouldn't expect any brand RAM to overclock well.
Corsair has been in the business a while, definetly an "enthusiast" oriented brand. They make quality/reliable RAM that ALOT of people overclock with. But don't forget, EVERY brand has it's "bad batches". My FAVORITE brand of RAM (OCZ) sent me a bad kit of RAM that sucked majorly...I just returned it and got anotehr kit that was superb. You've got to trial and error before you come to a conclusion. One test can't speak for millions of kits of RAM out there. Test 9-10 kits and then make a decision
