What PSU do I need?

[redmist]

I'm having a bit of trouble trying to find out what PSU I need.
Here are the parts for my rig so far:
Motherboard: http://www.dabs.com/products/gigabyte-970a-ds3-am3--amd-970-ddr3-atx-8DLY.html?refs=50509&src=3
CPU: http://www.dabs.com/products/amd-sempron-145-2-8ghz-1mb-am3-45w-74NJ.html?refs=56930000&src=3
GPU's: x3 PowerColor 5850's
RAM: http://www.dabs.com/products/kingston-4gb--1-x-4gb--ddr3-1333mhz-dimm-240-pin-cl9-7FS4.html?refs=468490000-42670000&src=3
Case: http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021

I have absolutely no idea what PSU I would need. I've had a look around and I'm guessing it would be somewhere around 1000Watts.
Could someone with more experience than me let me know what PSU I would need?
Thanks for your help guys,
-redmist

[crazyates]

A good rule of thumb is add 100W for your system, not including your GPUs. FOr 5850s, I would say ~200W for each of the 5850s, although they won't pull that much. You're looking at around a 700W PSU. You could go less, if it was a high quality one.

You want a fool-proof recommendation: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182264

$99
750W
80Plus GOLD
Single Rail
Modular

[Gator-hex]

Technically you're supposed to use something with 6 x 6pin PCI-E Power
http://www.scan.co.uk/products/1000w-akasa-venom-power-ak-pa100am03-uk-hybrid-modular-80-plus-gold-eps-12v-135mm-fan-atx-v23-psu

But you can get away with a cheaper 4 x 6pin PCI-E Power model and use a couple molex to PCI-E adapters
http://www.scan.co.uk/shop/computer-hardware/all/power-supplies/hybrid-modular-720w-950w

[mufa23]

"Single Rail"! Make sure it's a Single Rail PSU! I've owned many computers, but only once has a PSU ever failed. And that was because I overloaded a rail on one of my PSU's. Made a load pop, some smoke shot out the back, and then a very load electrical buzzing for a quick second until the breaker blew. Luckily, it didn't fry the rest of the mining rig.

[redmist]

Ok thanks for all the help guys!!
So do you think this one will be good?
http://m.dabs.com/products/corsair-800w-gaming-series-gs800-2013-edition-80--bronze--atx--ps-2-psu-8H0L.html?src=3
Thanks for the recommendation crazyates, but I don't wanna buy anything from the US because of high postage

[crazyates]

"Single Rail"! Make sure it's a Single Rail PSU! I've owned many computers, but only once has a PSU ever failed. And that was because I overloaded a rail on one of my PSU's. Made a load pop, some smoke shot out the back, and then a very load electrical buzzing for a quick second until the breaker blew. Luckily, it didn't fry the rest of the mining rig.

You technically can do a multi-rail, as long as you load balance properly. I had a 1000W 4 rail unit, that ran 3 smaller cards just fine. It wasn't until I tried to run some 5970s that the rails started giving me fits.

[crazyates]

Ok thanks for all the help guys!!
So do you think this one will be good?
http://m.dabs.com/products/corsair-800w-gaming-series-gs800-2013-edition-80--bronze--atx--ps-2-psu-8H0L.html?src=3
Thanks for the recommendation crazyates, but I don't wanna buy anything from the US because of high postage

Yep I think that's a single rail unit, so you're all set.

[redmist]

Ok thanks for all the help guys!!
So do you think this one will be good?
http://m.dabs.com/products/corsair-800w-gaming-series-gs800-2013-edition-80--bronze--atx--ps-2-psu-8H0L.html?src=3
Thanks for the recommendation crazyates, but I don't wanna buy anything from the US because of high postage

Yep I think that's a single rail unit, so you're all set.

Great! Thanks for the help guys