I have a 60MHz 060 chip and am running it at 66MHz on my GVP-m 4060 no problems. I had to get stable RAM though, my original 32MB SIMMs would fail at anything higher than 60MHz. At first I thought my setup would not overclock higher than 60, but when I tried the other SIMMs all was good! I am temped to try higher that 66Mhz on my GVP board!