P5WDH and TWIN2X4096-6400C5 incompatible?

[emilyg]

Hi,

 

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.

[DerekT]

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

Download Memtest Version 2.11 from--->

Here

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

Download CPU-z from

Here

.

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.