Recently I just purchased another set of these G.Skill F2-6400PHU1-2GBHZ's to go with the set I already had so I could run 4GB. Only reason I didn't get 2x2GB was because I already had these nice 2x1GB set. I figured I would try the settings that have been rock stable for me for over 4 months. My original setup was 9x390 DDR@ 1170 2.2V. After I put in the extra 2GB the system would not evne boot correctly anymore. I attempted to experiment with different settings but still even at DDR 975 4-4-4-12 which was stable before I put in the extra RAM didn't work.
Anytime I would run Prime 25.5(blend) It would fail after about 1 HR at the most, sometimes within a minute.
The one thing i'm not sure what to set is the sub timings which have stayed on AUTO and worked without problems.
Current Settings
JumperFree Configuration Settings
AI Overclocking: Manual
CPU Ratio Control: Manual
Ratio CMOS Setting: 9
FSB Strap to North Bridge: Auto
FSB Frequency: 389
PCI-E Frequency: 100
DRAM Frequency: DDR2-975MHz
DRAM Timing Control: Manual
CAS# Latency: 4
RAS# to CAS# Delay: 4
RAS# Precharge: 4
RAS# Activate to Precharge: 12
TWR: AUTO
TRFC: AUTO
TWTR: AUTO
TRRD: AUTO
TRTP: AUTO
DRAM Static Read Control: Disabled
Transaction Booster: AUTO
Clock Over-Charging Mode: AUTO
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
CPU Voltage: 1.4V
CPU Voltage Reference: AUTO
CPU Voltage Damper: Enabled
CPU PLL Voltage: AUTO
DRAM Voltage: 2.25
FSB Termination Voltage: AUTO
North Bridge Voltage: 1.4V
North Bridge Voltage Reference: AUTO
South Bridge Voltage: AUTO
Advance CPU Settings
CPU Ratio Control: Manual
- Ratio CMOS Setting: 9
C1E Suppport: Disabled
Max CPUID Value Limit: Disabled
Vanderpool Technology: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
PECI: Enabled
USB Configuration
USB Functions: Enabled
Legacy USB Support: Enabled
If there are certain known sub timings that work with the HZ's please by all means provide some input on these or any other settings that might help.
Current BIOS is 603
Before this current setup the only difference was the memory was at DDR 1170 2.2V and 5-5-5-15 and this ran months without issues rock stable but with the extra 2GB of memory it would not even boot at these settings.
Any input is appreciated. Thanks!



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