Performance takes a few forms. If your are a fan of synthetic memory tests than this RAM is significantly better that DDRI and overclocking helps quite a bit. However most of us don’t run these tests continuously so we look to the real world results. For the most part there is no significant increase due to DDRII memory. The exceptions are TMPGEnc which shows a 4.5% increase by moving to DDRII, and the game tests which show a 3-5% increase in frame rate (3-4fps) also by moving to DDRII.
Not the greatest overclocker, but still solid memory. Check out the full look at this memory at Viper Lair.