Comment Re:Obligatory Open Source comment (Score 1) 260
It's still worthwhile if you aren't upgrading the OS. Replacing MOBO + CPU + RAM is still cheaper than replacing a whole machine. Keeping the case, power supply, drives, keyboard, mouse, monitor, etc. etc.
Motherboards have gotten so all-inclusive lately, and USB so ubiquitous, that expandability is generally moot. Unless you're gaming, of course.