I took delivery of a nice cf-31 mk4 today. Under 6k hours, and in very good condition. Even better than I expected. Here's the mystery. Bios says 32 bit operating system, with 3 (and something) gb usable memory, with 8gb installed. But the Windows system page (visible when you hit properties after left clicking computer icon) says its a 64 bit Windows operating system with 7 (and something) gb usable memory 8 installed. I bought the machine thinking it was a 64 bit system. What should I believe, and how do you explain the variance? Sorry if this is a common occurrence. I'd never heard of it before.