lol yeh they do the job, but i still had to upgrade the fans in mine cus the heatsink's were way too hot, the paste had set hard... your CPU temps aint budged from the increase so theres no problem 🙂
from what i saw the 350, 450, and 550 all share the same heatsink, so you can understand why it can cause a problem. overheating parts screw up nice clean voltages. i probably sold 50 units of various sizes and only got about 3 back ( 1 was dead on arrival.. yeh right mr my 1st pc build :| )
your voltages are the same as mine and im running an xp2700, your temps are spot on. now it's working, enjoy it 🙂
any more problems go get a good branded PSU 😉