Hello to all First of all my Spec AMD A64 3500+ 939 (newcastle core i think) DFI NF4 SLI-DR Leadtek 7800GTX 2GB OCZ platinum EL Revision2 (4 x 512 MB modules) Tagen TG480-U01 PSU Iv had this board for about 2 months and its been totally reliable very pleased. With modern games i decided to purchaes another 1GB ocz plat rev2 I updated the bios to N4D626-3 latest bios on the DFI website then istalled the RAM. It finally booted after switching to 2T but was very unstable. as soon as u try to run a game or start a program etc it freezes what bios works best with 4 memory slots used up N4D626-3 or the previous version NF4LD-310 So far had no luck trying to cure the problem myself Any ideas anyone???