P5K-E, 8500C5D v2.3

[fiveprime]

I purchased 4 gb of this ram and I can only run 2 of the 4 dimms I purchased, all of them work, but only in 2x1 configurations. I also cannot get the ram to 1066 5-5-5-15 2T. Im currently running 1020 5-5-5-10, I think this might be due to my P4 topping out at ~3.8 ghz.

[Yellowbeard]

Can you list your system specifications and ALL of the info from the stickers on all 4 modules. Also, list all of the bios settings you have made for voltages, RAM, and CPU.

[fiveprime]

ASUS P5K-E Bios 0606
Pentium4 D0 @ 3.8 1.4 vcore
CM2X1024-8500C5D
XMS2-8500 1024MB 1066mhz 5-5-5-15 2.15 ver2.3 07480442 (on all4 sticks)
Im running them at (2 x 1gb)
1020mhz 5-5-5-10 2.25v (I browsed through the corsair forum and read on a few posts that sometimes you hvae to up the vdimm when runnind 4 dimms)

Antec 450 watt psu

[Yellowbeard]

ASUS P5K-E Bios 0606
Pentium4 D0 @ 3.8 1.4 vcore
CM2X1024-8500C5D
XMS2-8500 1024MB 1066mhz 5-5-5-15 2.15 ver2.3 07480442 (on all4 sticks)
Im running them at (2 x 1gb)
1020mhz 5-5-5-10 2.25v (I browsed through the corsair forum and read on a few posts that sometimes you hvae to up the vdimm when runnind 4 dimms)

Antec 450 watt psu

Actually, with 4 modules, it's not the Vdimm you need to increase. You will probably need to increase the memory controller (aka MCH or NB) voltage due to the load of 4 modules.

[fiveprime]

Okay, I did raise the nb to 1.4 I think but Ill check and see if I can change it anymore. If not then what do you suggest?

[fiveprime]

Even with the NB at 1.55v I could not post with all 4 sticks.

[Yellowbeard]

See what the maximum memory speed is that you can run with 2 modules. I am wondering if you are seeing a limit relating to your CPU and the memory dividers.

[fiveprime]

The speed I know is limited by the memory divider its already at 1:2, that I dont have a problem with, I just want to be able to use ALL of the ram I purchased.

[Yellowbeard]

You are probably going to have to slow it down then. Start with the memory at DDR800 and work it up slowly from there.

[fiveprime]

Ive tried that. I cannot get it to post with four dimms, and all the dimms on the mobo work.

[Yellowbeard]

Then you'll need to contact ASUS. I would think that the board should easily run 4 up at DDR800. Just for testing, have you tried them at DDR667 4 up?

[fiveprime]

No I have not, I will give that a try.