Depending on your location and power costs though, before the recent crises, it was probably generally worth it get newer hardware for the power efficiency gains. I have an old DDR3 dual-socket XEON E5-2650 system, and while it's more than sufficient for everything I run on it (and then some), its idle power consumption is pretty bad. If prices do ever come down, I'll probably try to replace it purely for that reason, even though I'm not sure I'll ever need more raw horsepower than it's got.