Hi all, I use 4 x 1gb memory sticks (A Data 800 mhz, 4 4 4 12). When all 4 sticks are installed, windows (64bit) randomly freezes and pc must be restarted. A few weeks ago I tested each memory alone on pc, 1 of them seemed to be faulty and I got it replaced. During the replacement process I have been using only 2 gb, there wasn't a single issue. After I installed 2 new memories, together with 2 old ones, the same problem appeared again. Random freezes. It doesn't matter how I combine those memories, 2 gb always work. I have the latest bios (mobo: Asus P5k), I tried changing NB voltage and few other settings, nothing helped. I noticed 1 thing though, all the memory sticks are extremely hot to touch. I am not sure whether the problem is mobo or windows, but until a month ago I have been using 32 bit windows and there were no freezes. Thanks for any advice.