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OC Questions for TWIN2X2048-6400C4D


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I'm looking for a little guidance on how to handle the voltage on my memory as I OC my system. I was informed that my board's default is 1.8v. My BIOS allows for increments of +0.1v up to I believe +0.7v. I'm beginning to take the CPU to levels that puts the RAM past the rated 800 MHz. When do I need to increase the voltage on my RAM and by how much? If anyone has any specific experience and can give a table of sorts, that would be really helpful.
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Lets see how 3.2Ghz works. Download memtest from http://www.memtest.org and extract the ISO image. Burn the ISO image to an CD-ROM disk.


Download Prime95 (OS: 9x/Me/NT/2k/XP) ---> Here


Download Prime95 (OS: XP x64/2003 x64) ---> Here


Download Core Temp Here


Enter your BIOS. On the main BIOS screen press Ctrl + F1. You will see the screen flicker. Next select the MB Intelligent Tweaker option. On that screen you will see many additional settings that were not there before.


MIB Intelligent Tweaker (M.I.T.)


CPU Clock Ratio = 8

CPU Host Clock Control = Enabled

CPU Host Frequency (Mhz) = 400Mhz

PCI Express Frequency = 100Mhz

C.I.A.2 = Disabled

System Memory Multiplier = 2

DRAM Timing Selectable = Manual

CAS Latency Time = 4

DRAM RAS# to CAS# Delay = 4

RAS# Precharge = 4

Precharge Delay (tRAS) = 12

ACT to ACT delay = Auto

Bank Write To READ Delay = Auto

Refresh to ACT Delay = 0

Read to Precharge Delay = Auto

Memory Performance Enhance = Normal

Dimm OverVoltage Control = +.3V

PCI-e OverVoltage Control = Normal

(G)MCH OverVoltage Control = +.02

CPU Voltage Control = 1.40V

Robust Graphics Booster = Auto


System Memory Multiplier takes the FSB and multiplies it to get the DRAM bandwidth. FSB = 400 so


400 * 2 = 800Mhz with 4-4-4-12 @ 2.1v

400 * 2.2 = 880Mhz with 4-4-4-12 @ 2.1v

400 * 2.4 = 960Mhz with 5-5-5-12 @ 2.1v


Run memtest on each test. Boot to the optical drive with the memtest disk and allow for two full passes. This will give your quad core a 3.2Ghz and some decent ram throughput. You can tell your uncached Memory Bandwidth on Memtest under the L2 Cache where it says "Memory".


Run Prime95 for ~8 hours for system stability testing. Run Core Temp. What are your Full load temps after an hour?


If you fail on Prime95, then raise your CPU Core Voltage from 1.40 to 1.45 and retest.

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