The 2T setting for ram works very well for me. I am using 80mm fan to cool down the ram. I am able to overclock to 2.8Ghz stable for 12hrs. I am trying @ 2.9Ghz right now. :)
Ram: 2.5-3-3-7, 2T, 3.25v, DDR333
HT: 290
Everybody, thanks for the suggestions