I am building a rig with the following components and planning on overclocking the i7 920 to somewhere around 4gigs
6Gb Corsair Dom 1600
1tb western digital hd
64gb western digital hd
assuming I have sufficient cooling, what wattage PSU should I be looking for, on top of that what make of PSU. I was thinking about a corsair 850watt, but am wondering if that'd be enough for future upgrades. I do not want a bottom of the barrel PSU wattage wise. Also I am on a budget.
The general rule of thumb is a high quality 500 to 500 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the 12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 4770, 5850, and 5870 cards which use a little less power due to their energy efficiency.
Before purchasing a new psu you will need to decide whether you will evdentually have a pc with one or two video cards.
Corsair, PC Power & Cooling, and Seasonsic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Lately we've been seeing a few other brands offering some high quality units.
A high quality power supply such as the Corsair TX750 can easily power an overclocked Intel Core i7 920 system with two video cards operating in Crossfire mode. The 850 is actually a little more than you probably need.