I still have a hexa-core Phenom II as my primary desktop workhorse. I'm not looking forward to the day the motherboard or CPU flakes out. It really does fulfill most of my needs. The only real advantage I can see by upgrading to something more modern is lower power usage. From an environmental perspective, I'm guessing I'd have to run the new system for a long time to make up for the impact of manufacturing the new motherboard and CPU.