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Help with BIOS settings for ASUS P5Q-Deluxe & TWIN2X4096-8500C5DF


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I'm having the hardest time getting these sticks stable. I've memtested the hell out of them and they appear to be fine. But roughly 50% of the time, I hang at the end of the XP boot sequence. I'm running a Q6600 at 3.4 with the latest BIOS (1406). All stress tests come back clean (both CPU and memory, run independently), its just this weird boot problem I'm experiencing. My previous GSk 2x2GB memory had no issues.


Here are my current settings. Anything I need to tweak?


AI Overclock tuner: Manual

CPU Ratio Setting: 8

FSB Strap to North Bridge: AUTO

FSB Frequency: 425

PCI-E Frequency: 100

DRAM Frequency: 1066

DRAM CLK Skew on Channel A1: AUTO

DRAM CLK Skew on Channel A2: AUTO

DRAM CLK Skew on Channel B1: AUTO

DRAM CLK Skew on Channel B2: AUTO

DRAM Timing Control: Manual


1st Information:

CAS# Latency: 5

DRAM RAS# to CAS# Delay: 5

DRAM RAS# Precharge: 5

DRAM RAS# Activate to Precharge: 15


All other memory timings: AUTO


DRAM Static Read Control: Disabled

DRAM Read Training: AUTO

MEM. OC Charger: AUTO

AI Clock Twister: AUTO

AI Transaction Booster: Manual


PL: 8

All pull ins disabled


CPU Voltage: 1.375

CPU GTL Voltage Reference (0/2): 0.63

CPU GTL Voltage Reference (1/3): 0.67

CPU PLL Voltage: 1.54

FSB Termination Voltage: 1.30

DRAM Voltage: 2.14 (my mobo undervolts, dmm reads 2.10)

NB Voltage: 1.26

NB GTL Reference: AUTO

SBridge Voltage: AUTO



Load Line Calibration: Enabled

CPU Spread Spectrum: Disabled

PCIE Spread Spectrum: Disabled

CPU Clock Skew : AUTO

NB Clock Skew : AUTO

CPU Margin Enhancement: Performance

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Save your settings somewhere, and I would load the setup defaults, set the memory voltage to 2.1 volts and test them each one at a time to see if you can isolate a memory module that may be causing the booting issues. This should rule out your overclocking settings as a possible cause, and if you can isolate a memory module which consistently causes these issues then at least we will know where the problem lies.
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Thanks for the response RAM GUY, I will test each stick individually.


In the meantime, do you think I need more NB voltage? I'm at 1.26 (BIOS). I can't for the life of me find what the stock value is, so I'm a tad hesitant to push until I have some level of understanding.


Do the DRAM CLK Skews do anything (I've never played with them)?


The only other voltages which may apply to RAM are the NB GTL reference and NB Clock skew, but I've never played with these either as I don't fully understand what they do.


Thanks again for the assist.

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