I am finding that with all obvious parameters set the same, BIOS 3.13 will run mprime -t for 3 hours before failing, but with 3.50 mprime -t fails in less than one minute. The system is a 3500+, Mepis Linux, Memclock limit 166, 2T, x11 multiple (3.13), 218MHZ LDT, all spread spectrums disabled...