Is there a setting somewhere in Windows, or is there a program I can run, that will tell me if my RAM is actually running in dual channel mode? I have identical DDR400 SIMMS in slots 1 & 3 of my ASUS P4P80E-DLX mobo. I know they SHOULD be in dual channel mode. I want to confirm it. Also, if I add SIMMs in slots 2 & 4, do they have to be the same SIZE as the ones in slots 1 & 3 inorder to stay in dual channel mode? I saw a post that says yes, but that's never been confirmed and some sources say it doesn't matter, as long as the SIMMs are matched in their banks. I've also posted this to the ASUS help-desk.