Long story short my RAM wont work in "Dual" mode. Unfortunatley i dont have a "matching" pair of modules: 1x 1GB 400mhz Module (No Idea 1x 512mb 400mhz Module (PNY) 1x 512mb 333mhz Module (PNY) (2x 512's dont work together...blue screen) I cant use all the modules together because my system wont boot. I can use the 1GB Module in slot 1 and any other 512mb module in slot 2. 1) Do i need to adjust Bios settings to allow dual channel to be activated? 2) I have flashed bios with update from DFI website. Still no avail? £) After upgrading i didnt format my drive due to the data i have stored on there...should i format? Anyone point out som tips i might need? Thanks I know i should have simular RAM but surely i can get it to run ok?