You need to add the total power of all your parts you can go here and do that! http://extreme.outervision.com/PSUEngine and let me tell you I had a very nice 620w and I found my system uses 835w peak and my system would act funny and crash when I was hard on it. I now have the pc power& cooling 750w it did fix the problem but I should have got a 800w unit I didn't look up my parts untill after buying.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.