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What psu should i get?

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Corsair Vengeance Blue 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMZ8GX3M2A1600C9B) £ 42.95

1TB Seagate Barracuda Green 3.5" SATA 3GB/s Internal Hard Drive [ST1000DL002] £ 62.08

Cooler Master CM Storm Trooper Black Full Tower Chassis w/ USB3.0 £ 104.99

ASUS P8Z77-V DELUXE Intel Z77 Socket 1155 DDR3 PCI-Express Motherboard £ 190.00

Intel Core i5-3570K 3.40GHz (Ivybridge) Socket LGA1155 Processor (77W) - Retail £ 174.60

PALIT GeForce GTX 670 2048MB GDDR5 PCI-Express Graphics Card w/ 1 FREE Game! £ 311.99

I am hoping to add an SSD a better HDD later on this month.
I am also looking to SLI 2 or even 3 cards when i need a performance boost.
So can you tell me what PSU I need
Thanks
Callan

More about : psu

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Homebuilt system Master

SLI with 3 wouldn't be a good performance boost over 2 with the 3 rd slot being x4. The way I read the MB specs it only support 3 way CF, not SLI.

that being said 2 GTX 670's in SLi needs 170W (MAX) each + system power w/ CPU (overclocked) totaled running at less than 80% than the PSU max. 340+208 =548W so to stay at 80% of max you will need 700W minimum (you might get away with a solid 650W as I am using maximum's and you rarely will hit them)

My Pick:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

other good options:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Homebuilt system Master

for SLI I wouldn't go less than a mid tower.

these are all good mid-towers. My wife's and son's gaming rigs are built using the Fractal Design R3. I recommend it as a good solid quiet case. you will need some additional fans though to keep it really cool. I like the Zalman and the NZXT Phantom also.

http://www.scan.co.uk/products/fractal-design-define-r3...
http://www.scan.co.uk/products/nzxt-source-210-elite-bl...
http://www.scan.co.uk/products/antec-300-three-hundred-...(new-version)
http://www.scan.co.uk/products/nzxt-source-220-black-mi...
http://www.scan.co.uk/products/zalman-z9-u3-mid-tower-b...
http://www.scan.co.uk/products/fractal-design-core-3000...
http://www.scan.co.uk/products/xigmatek-midgard-anti-vi...
http://www.scan.co.uk/products/corsair-carbide-series-3...
http://www.scan.co.uk/products/nzxt-phantom-410-black-p...
http://www.scan.co.uk/products/nzxt-phantom-410-gunmeta...
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