Only when I absolutely need to. Did a minor upgrade this spring...new mobo and vid card. Last major one was in 03, when I upgraded from P3 to P4, with a new mobo, processor, RAM and vid card. Upgraded the vid card again in 04 to a 6800GT. That one went bad this spring, and took out the AGP slot when it went, necessitating the latest upgrade. (STILL AGP, since at the time, I believed the card to be good...)