NWGuru is so all over this not much room to squeeze in. His advice is 100% top notch. NW clearly knows this notebook I do not. That said let me throw in a little input mostly for Turmoil as having a little issue. Moonstone you seem to going OK at this point.

A maybe stupid observation I might be a dick but what NW is calling a divisor (and it is) is also called the fsb:RAM "ratio".

NW pointed out this system likes a certain ratio. Guessing integer based? And as NW said do not work with two variables (CPU and RAM) at the same time. That stops you from identifying the problem.

Nothing wrong with downclocking your RAM 1066Mhz to see if your CPU can do 1333Mhz=3Ghz OC. That would be a 5:8 ratio. I think 5:8 is a ratio that NW might think is good. This is just to see if any benefit. The mixing does affect. Your inability to get 1333:1333 (333:666/1:2)) does indicate the CPU has the issue. But test to see.

Thermal monitoring is critical. You want to know how hot your baby runs. If you cannot keep thermal range within certain limits you must consider downclocking. Even if passes stress test. Heat kills and not always right away.

Getting way too deep and I believe a other application needed. If your CPU can't go above 2.8Ghz? How about if your RAM can handle faster than 1333Mhz. How about you change the CPU multiplier from x9 to x8? So 350Mhz would put your CPU at 2.8Ghz and RAM at 1400Mhz w/5:8 ratio.

This OC'ing is a jigsaw puzzle. You have voltage options correct? RAM only or CPU?

If RAM only you should be able to go above 1400Mhz, and if so a 2.8Ghz and 1500Mhz RAM is better than 2.8Ghz w/1333Mhz. See what I mean?

I stress test with orthos myself. But on occt you should have option to stress CPU or CPU and memory. As far as time goes? I would stress until temp stops rising then 10 minutes. If stable use your notebook for a while gaming or what not. If stable cool. There are so many silly opinions and what is enough.

Best of luck!