How to figure out how many watts is enough for your power supply?

I just ordered parts to put together a good fast system. I ordered a 750w power supply and am wondering if it is enough.

If you want to know exactly what I'll be running off of it, it is listed here: http://www.tomshardware.com/forum/ [...] 0#t1955537

But I'd like to know the forumla for figuring it out for other systems I build too.

thansk!!

Drop the Rosewill PSU, from the look of things a good quality 650W will be more than enough. Look for: Antec, BFG, Corsair, PC P&C, OCZ, or Silverstone (unless in a 220v area).

That particular Rosewill is a new one; 80+ bronze certified, with Active PFC. While the older Rosewills were lessons in overrated suckage, that new model should be decent. At the very least, it was run at 100% during the certification process, and didn't croak.

Thanks for your input guys!

I found this article and shed some light on the topic for me: http://www.anandtech.com/casecooli [...] i=3413&p=1