I have 4 gigs of Gskill 1066 RAM, but I am unsure how to configure my system to utilize that speed. My friend set their clock speed in bios to 1066 but the comp froze up, as he is not as familiar with AMD as he is Intel. Thus he gave up, leaving me with RAM that is not up to its full potential.
Read the first part of mindless's post again. No noticeable difference between the two. DDR2-1066 is mostly the same as DDR2-800 due to the increase in latency. Synthetic benchmarks will show a difference, but actual programs will be mostly the same.
The 9750 should be able to handle DDR2-1066, no overclock needed. Put the memory back in, and set the memory options to auto/SPD. I would think it would default to 1066. If it locked up, double check the voltage setting.
Here I go again: There is no such thing as DDR2-1066 RAM. Now that I have your attention ...
DDR2-1066 RAM is just DDR2-800 RAM at 4-4-4-12 (usually) timings that has been tested to run at DDR2-1066 speeds at 5-5-5-15 (usually) timings, sometimes at a slightly higher voltage. There is no practical gain to overclocking RAM.
Increasing the memory clock in response to an increase in FSB frequency is a different matter.