The Motherboard i have is a - Supermicro X5DA8 supporting Dual channel PC2100 DDR 266 ecc reg - 12gig total with 6 slots. http://www.supermicro.com/products/...E7505/X5DA8.cfm The memory sheme is interleaved so i must install 2 modules at a time. (I have 3 banks total each with 2 slots) Bank 1 Bank2 Bank3 | | | | | | 1B 1A 2B 2A 3B 3A Ok i want to run dual channel - right now i have 2 512 Dimms in slot 1B and 1A on bank 1 So i have 1 gig total ram. So questions - #1 Am i running in dual channel mode the way i have set up now? I Just bought 2 1gig Dimms to go along with my 2 512 dimms to total 3 gigs in my system. #2 Now would i just drop in those 2 1 gig dimms in bank 2 - 2B and 2A? Is that the correct way to run in dual channel mode? *BTW all the dimms are the same speed and make they are just differant sizes. Thanks for your help!!