http://www.oc-lab2.com/test.php?t=74
It's in Slovenian language, but you'll get the most of it - lot's of popular games tested:
- Pictures of water block & overclocking with it: Page 7
- Game & 3DMark tests: Page 3 to 6
I can sum up in english language if you would like so. :yepp:
http://shrani.si/f/3A/J3/2djBipf1/9800gx2wc.jpg