Well I have 2 128mb sticks and I was planning on placing them in slots 1 and 2. However, my alpha PEPP66 heatsink is blocking off slot 1 and I think slot 2 is a little close to the fins. Should I just stick them in 4 and 5 or 3 and 4 or what? Is there a difference between the performance of the slots. I read at overclockin.com one time that different FSBs could be reached by using different slots.