BIOS and Windows see 8Gigs, Cpu-z 16

[DARKADAM]

I 'THINK' its the dual channel config thats the issue. Try turning it off..

 

[GravitySmacked]

Agreed, it does seem to be an issue with dual-channel not I'm not aware of anyway to turn it off in the Asus BIOS.

 

[Aquinus]

What happens when you run only 3 DIMMs? Does CPU-Z show one slot empty and does Windows still report 8Gb? I've been reading that a lot of people who had a similar issue resolved it by changing the order of the memory.

Would it happen to be a quad-channel memory kit? (I know the rig doesn't use quad-channel, but you can still throw 4 DIMMs in.)

Also does running it at 1066 make any difference?

Agreed, it does seem to be an issue with dual-channel not I'm not aware of anyway to turn it off in the Asus BIOS.

DIMM slots are wired to the CPU socket, you can't run 4 DIMMs on one channel. It is physically impossible with how it's implemented. There should be two different colors for DIMM slots, try two DIMMs on one color and the same DIMMs on the other color. If it fails to boot on one color, the channel isn't working for one reason or another. You can do it this way because the slots, as I said, are wired directly to their respective channels. Memory channels are not switched to the best of my knowledge.

 

[GravitySmacked]

Thanks for your reply.

If I put DIMMS in slots 1 and 3 then it shows 8GB. If I put DIMMS in slots 2 & 4 then it shows 8GB. If I put DIMS in slots 1 & 2 or 3 & 4 it only shows 4GB.

All slots how active in the BIOS monitor section and CPU-Z finds them but both the BIOS and the OS only show 8GB.

I took the using MeMTest which seems to show that slots 2 & 4 are full but not not mapped.

I think it's an issue with the 1206 BIOS. I've tried rearranging the DIMMS and adding them in a different order with no joy.