Hi. I have a GA-X48-DS4 motherboard with an E8400 Core 2 Duo and 4Gb (2x2) DDR2 RAM. I built the system about 2 years ago.
Here is my RAM:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231166In order to get the RAM to work at 1066 with 5-5-5-15 timings, I had to add 0.25v to the DDR2 Overvoltage Control value in the BIOS. I also had to set the System Memory Multiplier to 3.2B (3.2 x 333 = 1066). It has been running at this for about 2 years without any issues.
Recently I decided to overclock my PC. To achieve 3.6GHz on the E8400 (stock is 3.0GHz), I did the following in the BIOS:
Changed CPU Host Frequency from 333 to 400 (left the CPU Clock Ratio at 9x).
Changed the System Memory Multiplier to 2.66D (2.66 x 400) = 1064.
Changed the CPU Voltage Control in the BIOS from Normal to 1.2150V.
I ran Prime95 for 9 hours last night with NO errors.
My question is, with all these BIOS settings, should I set "Performance Enhance" in the BIOS to Standard, Turbo, or Extreme? What does this setting actually effect? Out of the box, the BIOS had this value set to Turbo.
Also, would I be better off setting my RAM to run with tighter timings at 800Mhz (in other words, set my System Memory Multiplier to 2.00D and my timings to say, 4-4-4-12)?
