|"AGAIN MY RAM IS 1066 DDR3 not 800DDR2"|
Dude, you need to pay attention & understand what you're being told. The ratio info provided by Fingers is very important. There are 2 ratios that are considered optimal for a Core 2 Duo (or Core 2 Quad) system - 1:1 or 1:2. The ratio is based on the frequency, not the bogus "effective" speed ratings. Since you only have DDR3-1066 RAM (266MHz frequency), 1:2 will only be attainable under certain circumstances, so you should use 1:1 instead.
If you configure your CPU to run at 1333MHz FSB (333MHz frequency), your RAM should be configured to run as DDR3-667 (333MHz frequency) for 1:1 ratio. You *may* be able to run the RAM as DDR3-1333 (667MHz) for 1:2, but the minor performance gain over 1:1 probably isn't worth the risk.
If you configure your CPU to run at 1600MHz FSB (400MHz frequency), your RAM should be configured to run as DDR3-800 (400MHz frequency).
The faster the FSB, the better the performance, so your ideal overclock settings would be CPU at 7.5 x 400MHz with the RAM underclocked to DDR3-800.
Also, once you've settled on your CPU/RAM settings, you should stress test your system before using it for anything critical. Here's a list of CPU software: