I had been running QNX 6.3 on my trusty old 1.4 GHz Pentium III system with two gigs of memory for the last couple years and it was alright. Never quite fast enough despite decent hardware (P3 chips were 2x as fast as P4s clock per clock, don't whine otherwise) and limited hardware support, I was looking forward to the upgrade because, finally, after four years I might get a better-optimized system.