Overclocking and Voltage

Hello, folks

I have been wrestling with getting my OCZ Reaper 1066 to actually run at 1066. Recommendations say that the voltage should be at 2.3v in order to maintain stability at 1066.
The problem: If I go into the bios and set the memory to 1066 and adjust the memory voltage to 2.3v, I get automatic reboot (after the machine initially reboots, of course). I will admit, I don't fully understand timings but have been told that these particular modules may not need the timings tampered with in order to achieve stability at 1066, so they have remained stock.
If I use the overclock utility that came with the motherboard (Biostar T-series), I am able to push the heck out of the memory clock as well as cpu to like 3.6g (E8400)/ 880, respectively, with the voltage on the memory at only 1.8v and running as 800.
What else need be tinkered with to realize the 1066 potential? What are other parts to consider?

I realize the novice of my question and admit I need to know a heck of a lot more before messing with most of this stuff but nothing ventured, nothing gained.

Biostar TP43D2-A7
Intel E8400
OCZ Reaper 2x1g 1066
Rosewill Stallion 500w 12v
Nvidia 8800gt 1gb
Seagate Sata 250

Any input will be appreciated.

Horace