Gygabite EP43-UD3L Memory Overclocking Question

Seems you've got everything covered, so you've got to increase the voltage. Be careful though, your quest to reach 1066 may actually degrade performance.

There is no JEDEC standard for PC8500 (DDR2-1066) memory. All it is is PC6400 (DDR2-800) memory that has been tested to run at the higher speed, usually by increasing the voltage (2.3 v is really high) and loosening the memory timings (CL4 to CL 5). That's why you need to manually adjust all the memory parameters.

Will all that in mind, you have selected memory that can run twice as fast as your CPU. And you are not going to be able to reach 4.8 GHz. with an E6600 without really exotic cooling. You may be able to reach 3.6 GHz. But you could do that with good DDR2-800 memory.

And I have never seen any practical benefit to running memory faster than the FSB.

Go into the BIOS during the first boot. Find the OC settings. (I forget what they're called. I am on vacation away from my computers.) The voltage adjustments are all the way down at the bottom. Adjust vRAM to 2.3 volts. If you cannot adjust that high, set it to the maximum.

And if you are going to overclock, you will need a good CPU cooler. I wouldn't run the stock cooler past 3.0 GHz.