Help choosing GPU and PSU

Here what i would get - PSU: XFX P1-650S-NLB9 PRO650W Core Edition Power Supply:
http://www.amazon.co.uk/XFX-P1-650S-NLB9-PRO650W-Editio...



GPU:Asus Radeon HD 7850 DirectCU II Graphics Card (2GB GDDR5, PCI Express 3.0, 870MHz/4840MHz, HDMI, DVI-I, DirectX
11.1 http://www.amazon.co.uk/gp/product/B007OYS4R6/ref=s9_si... TOTAL 279.35€.

Or i would get this PSU:Corsair CMPSU-650TXV2UK Enthusiast Series TX650 V2 High Performance 650W Power Supply
http://www.amazon.co.uk/Corsair-CMPSU-650TXV2UK-Enthusi...



GPU:Asus nVIDIA SLI GeForce GTX 570 DirectCu II Graphics Card
http://www.amazon.co.uk/Asus-nVIDIA-GeForce-DirectCu-Gr... TOTAL 310,42 €

That is in pounds , not euros :s

The psu you need will be determined by the graphics configuration. In simple terms, a graphics card with two 6 pin pci-e connectors will need about a 500w psu. If you add a second such card, you will need 150-200w more.

If you will be using only a single monitor, I suggest it would be better to plan on just one good card.
Here is my thinking:

a) How good do you really need to be?
A single GTX560 or 6870 can give you great performance at 1920 x 1200 in most games.

A single GTX560ti or 6950 will give you excellent performance at 1920 x 1200 in most games.
Even 2560 x 1600 will be good with lowered detail.
A single 7970 or GTX680 is about as good as it gets.

Only if you are looking at triple monitor gaming, then sli/cf will be needed.
Even that is now changing with triple monitor support on top end cards.

b) The costs for a single card are lower.
You require a less expensive motherboard; no need for sli/cf or multiple pci-e slots.
Even a ITX motherboard will do.

Your psu costs are less.
A GTX560ti needs a 450w psu, even a GTX580 only needs a 600w psu.
When you add another card to the mix, plan on adding 150-200w to your psu requirements.
A single more modern 28nm card like a 7970 or GTX680 needs only 550W.
Even the strongest GTX690 only needs 650w.

Case cooling becomes more of an issue with dual cards.
That means a more expensive case with more and stronger fans.
You will also look at more noise.

c) Dual cards do not always render their half of the display in sync, causing microstuttering. It is an annoying effect.
The benefit of higher benchmark fps can be offset, particularly with lower tier cards.
Read this: http://www.tomshardware.com/reviews/radeon-geforce-stut...

d) dual card support is dependent on the driver. Not all games can benefit from dual cards.

e) cf/sli up front reduces your option to get another card for an upgrade. Not that I suggest you plan for that.
It will often be the case that replacing your current card with a newer gen card will offer a better upgrade path.

@TheCereaKillerPT , try that again without the vulgar language.

I'm sorry , but i tried to use diferrent words , because my english is not that good , if u understand   Can you help me ?

lol my bad