Please could I have soe help with what psu to get?

Hi ive got a system here that I am going to make and im not sure on how much wattage and cooling i should need

Everything seems fine to me if you don't plan to OC... maybe beef up your PSU a little bit just to help extend it's life a bit (running a PSU at full load will shorten its lifespan).

if you plan to OC you might want to look at an aftermarket Heat Sink & Fan.... I personally like Zelmans, good quality stuff... or if you want to splurge some money, get liquid cooling.

Thanks zenmaster , i will be using it most for gaming so i looked on the site of my supplyer and there is this an ASUS 8600GT with 512 ddr3. there is a link here except this one only has 256 http://www.newegg.com/Product/Prod [...] 6814121096

Don't guess at how much you need; calculate the minimum then bump it by no less that 25%

So if you need a bare minimum of 400 then get a 500, if you need 600 then get 750... and so on.. this will help keep your psu cool and not push it too hard. I'm only building with a minimum of 750 watt psu's these days... sure it's a bit of overkill, but these systems are designed for overclocking and all the rest... I have an E6600 running solid at 3.7 with a bus at almost 1700 using ddr 800 memory...

use this link to figure it out

http://www.extreme.outervision.com [...] orlite.jsp

Tanks everyone for the tips so at the moment i am probably going ro change to the E6600 because ive used a couple calculators for wattage and the quad core uses much more and it involves more cooling.
unfortunately for us aussies the 8800gts is about $200aud more expensive tha the 8600gt so i cant upgrade that far without dropping some stuff