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TWIN2X4096-6400C4DHX on Asus P5QC


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I've got a new Asus P5QC and two new modules of each TWIN2X4096-6400C4DHX and TWIN2X2048-6400C5DHX. If I install the 4096 modules I get huge amounts of memory errors. It doe snot matter in which slot they are and if I install both modules or only one or install them together with the 2048 modules or alone. The 2048 modules on the other hand work perfect in every slot.


I am running the modules under 800Mhz with 2.1V


I would like to test the modules in a system known to work but don't have any way to do that. Fry's where I bought the modules wants $39 for the test which I am unwilling to pay since I bought the modules for about $60. Other local stores charge even more.


Any ideas on this anyone?

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Download Memtest86+ V2.11 from--->

and extract the ISO image. Burn the ISO image to an CD-ROM disk.

Download CPU-z from

I wouldn't try to mix and match the modules together. Insert one stick of the 2GB module in the first slot closest to the CPU. Enter your BIOS, Load Setup Defaults, Save Setup Defaults and set to these values:

AI Overclock Tweaker

Configure System Performance Settings

Ai Overclock Tuner = Manual
CPU Ratio Setting = 9
FSB Strap to Northbridge = 333
FSB Frequency = 333
PCI-E Frequency = 100
DRAM Frequency = DDR2-800
DRAM Timing Control = Manual
DRAM Frequency = DDR2-800
DRAM Command Rate = 2N
CAS# Latency =  5
RAS# to CAS# Delay = 5
RAS# PRE Time = 5
RAS# ACT Time = 15
Row Refresh Cycle Time (tRFC) = 55 
All Else to Auto
DRAM Static Read Control = Auto
DRAM Dynamic Write Control = Auto
DRAM Read Training = Auto
DRAM Write Training = Auto
Mem. OC Charger = Auto
Ai Clock Twister = Auto
AI Transaction Booster = Auto

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

CPU Voltage = Auto
CPU PLL Voltage = Auto
FSB Termination Voltage = Auto
DRAM Voltage = 1.9v
NB Voltage = 1.35v
SB Voltage = Auto
PCI-E SATA Voltage = Auto

Load Line Calibration = Auto
CPU Spread Spectrum = Auto
PCIE Spread Spectrum = Auto
CPU Clock Skew = Auto
NB Clock Skew = Auto
CPU Margin Enhancement = Optimized

Memory Remap - Enabled

Legacy USB = Disabled (For Memtest, Enabled After Memtest)


Run Memtest for two full passes. Shut down and remove the stick. Place it in the third slot and test it again. Then insert the second stick in slot one and test it alone. Finally, insert one in slot one and one in slot three and retest. When assured of stable DRAM, then enter Windows and Run CPU-z and post screenshots of CPU-z's CPU, Memory and SPD tabs.



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Thank you very, very much for your help!


However, I tried to follow your advise and things somehow got worse than ever. I built in the 2048 modules in the first slot and the screen just stayed black and not even a beep came from the computer. After almost 3 hours of trying it turned out that things work perfectly with the smaller modules in the second slot pair from the CPU and everything else results in the screen staying black. This behavior is new and I guess something more must be wrong than just the RAM...


However thanks again for your help!

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