also keep in mind the memory timings. If the 2700 memory runs at lower timings and you stick in the pc3200, the pc3200 may run more relaxed timings, and if it can't handle the lower timings of the 2700, it may not even post. To remedy this, go to your BIOS, set the memory timings to "optimal" or whatever the highest timings are, then put the 3200 in, and then boot. Play with the timings from there, and see where it goes!