The 503+ (v1.2A, don't know about earlier versions) will run 100MHz FSB with EDO RAM just fine. The board has built-in correction for the clock mis-match. You can even run DIMM bank 0 with SIMM(s) but you have to fart around with BIOS settings forever to make it stable (slow). Many motherboards do not handle clock mis-match. Also look at 400MHz CPU...about +15% speed for about +$15 more. Martin Kurr email [log in to unmask] > From: Paul Jones[SMTP:[log in to unmask]] > Subject: [PCBUILD] 100MHz bus and EDO ram > A student of mine has been told that if he wants to put an AMD K6-2/350 on > a FIC VA-503+ MB, he can't use his old EDO memory because of the 100MHz > front side bus. Curious about the people moderating your messages? Visit our staff web site: http://nospin.com/pc/staff.html