Jump to content
Corsair Community

P5WDH and TWIN2X4096-6400C5 incompatible?


Recommended Posts



I've bought two TWIN2X4096-6400C5 kits (so the total is 8Gb) as we need it for our work. I've got this on a P5WDH motherboard with the latest BIOS and also have a E6750 installed.


However running everything at AUTO i get wierd/inconsistent clock speeds. Whats the best way to configure this board to go with the Corsair ram? At the moment I've got it at Overclock Profile FSB1333/DDR-667 and it boots at 2.66Ghz and PC4300 RAM.


I also noticed that running Memtest will fail if I have all four sticks inside, where as 2 sticks (4Gb) will work OK (both were tested with one pass on each package).


Do I need to bump up the voltage sent to the memory? The specifications state 1.8v for these.


Any help is greatly appreciated.

Link to comment
Share on other sites

The load and access of 8GB of four modules is marked in comparison to 4GB of two modules.

Download Memtest Version 2.11 from--->

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

Download CPU-z from

Please Enter your BIOS and set to these values, save and shut down.Try these settings:


Configure System Frequency/Voltage

  • AI Overclocking = Manual

  • CPU Frequency = 333

  • DRAM Frequency = 667MHz

  • Performance Mode = Auto

  • PCI Express Frequency = 100

  • PCI Clock Synchronization Mode = 33.33


  • Memory Voltage = 1.9v

  • CPU Core Voltage = Auto

  • FSB Termination Voltage = Auto

  • MCH Chipset Voltage = 1.6v

  • ICH Chipset Voltage = Auto

Advanced Chipset Settings

  • Configure DRAM by SPD = Disabled

  • DRAM CAS# Latency = 5

  • DRAM RAS# Prechardge = 5

  • DRAM RAs# to CAS# Delay = 5

  • DRAM RAS# Activate to Precharge: 15

  • DRAM Write recovery Time = 6


Leave all else on AUTO settings. Boot to the CD and allow a few passes. If stable, enter Windows and please post screenshots of CPU-z's CPU, Memory and SPD tabs.

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Create New...