So I thought I would add some more juice by buying a 1GB moduel. It arrived today and I have 4 memory slots. So I put the 1GB in one of the black slots as the 2 blue slots have sticks of 512 in them. But what seems to be happening is when I put the 1GB in any slot my motherboard is only recognising whatever's in the first blue slot so it even discards the other stick of 512. I've been reading the manuel and it doesn't have the 1GB modeul listed in the supported section but I think that's because Corsair didn't release the value 1gb stick then. I bought:

Corsair (VS1GB400C3) 1024MB, DDR400 / PC3200, non-ECC, 184 DIMM, unbuffered, CL3, 64Mx8 DRAMs

And on the Asus site it says it supports:

Do this to test a theory... put the 1GB in your slot 1 and the other two sticks in slots 2 and 4 and see if it see it then!

It says I only have 512 now :/ hmm

remove the two 512's

Alright I have an improvement. I put the 1GB moduel on slot 4 and the two 512's in slot 1 and 3(the dual memory slots) and now I have 1.5gb memory.. so one of the 512sticks arn't being recognised now..

Just use the new 1gig stick and see if it reconizes it. From what I am seeing and other might be getting at it as well .. you 1gig stick may be bad.

also the asus mobo is picky on hte ram and sometimes doesnt auto-detect the High Ram moduals correctly. I seeing it with XMS and Patroit Ram.

What is the type and speed is your 512's?

They are both DDR400 PC3200, the same as this 1GB module. Some one said it might be because of the dual channel being turned on. But i've looked in the BIOS and found no way of being able to turn it off. I think it's conflicting.

Corsair? have you tried just the 1GB?

Yep, it sees the 1GB stick fine. When I insert the two 512 sticks it just either goes upto 1.5gb or just stays at 1gb and if I put a 512 stick on the first slot it just says 512. So it brings me to the conclusion that the dual channel setting is getting in the way but I don't know how to turn it off there's nothing in the BIOS that mentions it.

try the 512's in 1 and 3 and the gb in 2

Yea I did that and it said there was only 512 installed. If I put 512 in the first slot is says only 512 and if I put the 1GB in it it says there's only 1GB so if I avoid the first slot and put the 1GB in 4 and the 512's in 2 and 3 I get 1.5GB memory. The dual channel is conflicting it looks so much like.

what about the 512's in 2 and 4 and the 1 gb in 3?

It just sees it as 1GB. because my motherboard expects it to be added in pairs. bollocks. looks like I need to try and take it back. Thanks for the help mate ! It seems stupid you can't turn off this dual channel stuff.

rather than take it back just wait and buy another one just like it and have 3 GB

ye ye good idea, cheers!

or turn off dual channel memory support

Quote: Originally Posted by Psycho Pigeon ye ye good idea, cheers!

It's most likely the dual channel is causing the "problem". I believe that you can't mix and match, you either use dual channel in total or you don't use it at all.

Another thing to try would be to flash your BIOS. Do so with great caution and much research!

Quote: or turn off dual channel memory support

How would I do this though? There's nothing in the manual that mentions this at all.

in some motherboards its an option...in others it isnt... in your board.... its related to they processor ... i dont think you have a rev.e proc...well read this:

That means you have a Rev.E processor. According to the 26094 AMD
document, Rev.E processors now have the ability to use all slots
in single channel (64 bit) memory mode. That is why three sticks
worked and all the memory (1.5GB) was detected. If you had a
release of processor previous to Rev.E, either the computer
wouldn't POST in that config, or some of the memory would not
be detected.

*****
Previous to Rev.E

1 stick (use B1 or B2, as Ax slots won't work)
2 sticks (B1 & B2 - single channel, A1 & B1 - dual channel,
A2 & B2 - dual channel)
4 sticks (pair in A1 & B1, pair in A2 & B2, less hassle if all
DIMMs identical, unclear what rules the BIOS is using)

*****
Rev.E

1,2,3, or 4 sticks now possible.
Sticks can now be placed in the Ax slots, whereas before
Ax slots were only to be used for dual channel configurations.
B is no longer the "primary bus", A and B bus are equals.

Combinations which are not paired, revert to single channel
64 bit mode. If your DIMMs are not matched to the BIOSes
satisfaction, it will throw the board into single channel
mode. 2 unmatched sticks, 4 unmatched sticks, and any kind
of 3 sticks, can give single channel mode.


more info can be found here....
http://hardware.mcse.ms/archive69-2005-8-223294.html