250 watt 旧电源能否带动现在市面上主板和CPU?

Depending on how much hardware you connect to the same power supply...Personally, I'd been using an old 230 W power supply that I brought 5/6 years back, and had upgraded the whole system (M/B, RAM, CPU, etc.) to more modern models. I had had absolutely no problem with it since I had always tried to avoid connecting additional hardware to the same power supply. For example, I had externalized one of my HDDs that were the latest model, had connected monitor directly power outlet instead of the computer's power supply, ... Of course, I'm no longer using such old power supply nowadays, as more new hardware like CD-R/W drives, big HDDs, USB devices, etc. all are draining power aggressively from the power supply. In conclusion, if you manage your power distribution carefully, even a 250 W power supply is fine for modern computers (unless you are "heavy" hardware installed), though you might have to externalize some of the power drainers to power outlets.

wow... you are really burning your power supply huh...dare not do that. I did similar thing last time, and sufferred occasional data error with my HDD (so externalized some devices). I think the stability of the local electricity supply is crucial too.