Dual channel doesn't work

[luccindefoe]

I'm trying to get my computer to work in dual channel.

Motherboard: MSI K9N6PGM2-V (MS-7309)
CPU: AMD Athlon 64 x2 3800+
RAM:
Slot 1 - Ceon DDR2 (PC2-5300) 1024MB 5-5-5-15
Slot 2 - Ceon DDR2 (PC2-5300) 1024MB 5-5-5-15

I can't get it to work in dual channel. POST and CPU-Z say it works in single channel (and I believe them ).
The only difference between the RAM modules (according to CPU-Z) is the Part Number.
One is 1024736750L, the other is 1024636750L.
I didn't buy them together. I used to have 1GB and I bought another 1GB which was the same manufacturer, same size, same speed.

Thanks for the help.

 

[RetiredChief]

(1) Most common cause is installed in wrong slots - Not Your Problem as You only have two slot.
(2) Looking at manual, did not see a line item for enabling daul channel.

(3) Have you tried clearing CMOS, or In bios selecting Load "Optimized"