Problem with A8N-Sli and Ram

[morpheous87]

The motherboard is A8N-Sli, CPU Athlon 64 3000+.
Till now the computer was with 2 sticks of RAM, each 512MB DDR400 Kingston. Now I've got a new A-data 1GB DDR400, and I put it in one of the free slots. BIOS recognise only 1.5GB, I tried separately, and all of the RAMs are working properly. BIOS is last version I think (I upgraded it soon). Is it the problem beacause the new one is 1GB stick? How can I make the computer recognise all 2GB ram ( Without double channel ram mode) ?

 

[jaquith]

Welcome to Tom's Forum!

ref ASUS A8N-SLI - http://www.asus.com/Motherboards/AMD_Socket_939/A8NSLI/#specifications
4 x184-pin DIMM, Max. 4 GB, DDR 400/333/266 ECC,Non-ECC,Un-buffered Memory

Without looking at you manual I often find the older MOBO's require equal Channel sizes so IMO get another 1GB of DDR-400.

 

[morpheous87]

Can I switch off the dual channel mode and use all of 2GB ram ?

 

[jaquith]

Nope. The BIOS reads the size per DIMM and per channel.

Manual -> http://dlcdnet.asus.com/pub/ASUS/mb/socket939/A8N-SLI/e2068_a8n-sli.pdf ; note 1-12. I doubt the mapping options will help, but you can mess around with them to see if there's any differences.