Memory Timings Driving Me Crazy

Hi guys, heres my setup

ASROCK PENRYN1600-110DB SLI 650I

GX2 9800

6GB DDR2 800

300GB SATA 2

750W CORSAIR PSU

Q6600

Right, I have been trying to get a stable overclock but to no joy, I have put it down to my memory timings. I have kept everything at stock and I am trying to find a stable memory setting, I have looked in CPU-Z under the SPD tab but it has no information on the rated memory timings. The ram is cheap ram from ebay but it has samsung chips on it though. I am very confused as I know that my memory timings are holding me back but I have no idea what to set it to.

I would like to hit 3.00ghz with 333 fsb overclock on my processor and that would leave my ram at 666 mhz which would be underclocked as it is ddr 800.

I really could do with some help on the memory timings and advice. Its driving me crazy, I am getting prime time 95 fatal errors which I have looked up and it is the ram.

Thank you guys