Hi, I'm having trouble getting two 512mb memory sticks to work properly in dual channel mode on my computer. My system specs are as follows: Gigabyte GA-K8NF-9 (Latest bios drivers - F7) nForce4 4x AMD Athlon64 3500+ S939 2.2GHz 2x DDR 333mhz CL2.5 memory sticks (1 is branded RAmos, the other has no brand name) ATI Radeon X800XL 256MB PCI-E The problem I'm having is to do with getting dual channel mode to recognise 1GB of memory on my system, because at the moment it is only recognising 512MB of memory. My system only reads both memory sticks when they are working in single channel mode. I took the memory sticks to my computer parts supplier, he tested both sticks on his computer and had no problems. I'm not sure if he was running the memory in single or dual channel mode though. I've read the manual for my motherboard, I've read through different forums (including this one), and I've read the article explaining dual channel memory at this website: (www.hardwaresecrets.com/article/133/1). None of these helped with my problem. There is an interesting part in the article though, that discusses how instead of the chipset controlling dual channel mode, Athlon64 S939 cpus handle dual channel memory via an embbeded Dual Channel memory controller (Page 6). Does anyone here have a solution to my problem?