My system specs:
AMD Phenom II 945 125W TDP C2 @ 3.5Ghz (1.40V voltage)
2x2GB OCZ Platinum 1600Mhz CL7 1.9V (i plan to add another 2 sticks)
Samsung 500GB F1 HD502IJ
OCZ ModXStream 500W 
 

 
Anyone?
 
 

http://www.tomshardware.com/forum/306665-33-what-other-requirements
 
Google is your Friend. 

It doesnt tell me much, some people say it will work on good brand 500W and some it wont.
In fact on the official EVGA website says the card requires min. 550W PSU with 38A on 12V rail (my card has 36A which is so close...)
In fact this review: (damn it i cant post a link, the review is on hardwarekanucks . com) says that the power consumption under load is about 355W which should be no problem for my PSU so it's quite confusing.
 
Anyone else?

at stock clocks probably it will do, but with overclocking involved it could be a problem ... 500W is really not that whole much ...

Let's go with this...

Maximum power draw for the GTX570 is 219W without overclocking.
Maximum power draw for the AMD Phenom II 945 IS 125W without overclocking.

You already are at 344W just with those 2 components.

Each HDD takes 12-20W per drive for platter drives.
Each Optical drive takes 10-15W when not burning.

So with just 1 of each, you are maxing out at 379W.

All of these items are pulling off the 12V rails and your PSU has 432W maximum available to the 12V.

Can it do it, short answer is yes. Do you want to do it, my answer is not if you want that PSU to last. You are stressing the 12V at 87% of capacity at max load when it is a 80 plus PSU that will only really be able to stress to roughly 80%.

This is why EVGA and NVIDIA recommend a 550W PSU at minimum.

Yes but If you go on 550-600W than choose Seasonic X-560.
But AX650 or HX650 is something what you need. Or X-660 or X-650 is cheaper now but good PSU, enough Ampers enough W.
But But But CORSAIR is better choice, 7 years warranty, better cables and easy communication with technical support if you need something.
Seasonic Gold is 5 years Warranty (2 less than CORSAIR)and only 10-20$ cheaper.
Both brands AX CORSAIR and X Seasonic have excellent and very silent fan inside - San Ace.
 
 

I cannot afford new PSU atm, oh well i'll just go for something less power consuming like HD 6950.
 
Thanks for the replys.

You can upgrade and drop the power consumption if you go to a GTX670.
 
GTX570 requires 550W with 38A on 12V
GTX670 requires 500W with 30A on 12V
 
I know you said you couldn't afford the PSU upgrade, but consider that possible idea too.  You are going to have to spend money somewhere, its just a matter of where.

Well but the problem is GTX 670 costs about twice as much. 

Yea, its a toss up both ways.  I understand the cost constraints, but I just wanted to throw the idea at the wall and see if it sticks.  I would hate to not make the suggestion if you are stuck with the GTX570.  You could also Step Up the GTX570 to a GTX670.  The $$$ on that isn't due until you get through the Step Up queue, which can take anywhere from a week to a couple months.

well if you really want the 570 check around the marketplace in here and look at microcenter sometimes you can catch great deals on psu's and you could check out this one from newegg http://www.newegg.com/Product/Product.aspx?Item=N82E16817182132

Always pay attention to amps, without it, wattage has no context.  Some higher quality PSU's have more 12v amps than others with more wattage; so you can't just refer to a PSU or what a system needs by wattage alone.
 

pcmaster00

This is why EVGA and NVIDIA recommend a 550W PSU at minimum.

pcmaster00, I don't know if you learned from me or not, you post was a good call, certainly much smaller.  
 
Something to considering with either AMD or Intel or nVidia: TDP isn't electrical draw, it is just a category. 
 
Even nVidia doesn't call the power draw of their cards TDP, they call it 'board power'.  A central processor's real TDP could be anywhere from 95W to 125W (it could have a full load of 96W TDP), thus given the category name of 125W TDP.  But it's electrical power draw is definitely higher than 125W (closer to 150W considering efficiency ratings), so the amp rating puts him in the danger zone with his PSU unless he's willing to reset to stock. 
 
As for why EVGA and nVidia recommend more, I think it has to be with liability mainly.  If they didn't include a recommendation for system power, people are free to get anything and ruin their graphics card if they get too little, all while expecting EVGA/nVidia to be responsible for RMA's-- which is a waste of their money due to customer negligence.  Hence higher average system power recommendations.
 
Fact is, if someone used a fast dual-core with HT, like i5-655K or Core i3-2130, paired with a GTX690, and the basics, they wouldn't need a PSU with more than 32A from 12v, which is in the range of most 450-500W units -- but nVidia throws up a 700W requirement.  It is more about liability, nVidia can't gaurantee what we put in our systems and how long we keep it, or even the quality of unit we buy, so a generalized PSU only makes sense if it is exaggerated.

I talk about best PSU on market. That is not necessary. Only if you think to go on 550W you must buy real 550W than, it's Seasonic.
CORSAIR TX650 V2 it's not so exspensive but I think its more than enough for GTX570. Don't go on 6950. It's hoter and weaker, gameplay is better and smoother on GTX570.
TX650 V2 for about 85$ and 53A on 12V rail is excelent for you with 2x 6+2 pin and everything else... and with this PSU you can tuch stock GTX580 performanse. Bronze PSU with 5 years Warranty. 
 
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020
 
Think twice almost GTX580 stock and 6950 on 90C is two different things.
Maybe you think it's third rang CORSAIR PSU but they say TX series is for hardcore gamers and pc entusiast.
I think it's cheapest and best options but you decide. 
 

Thank you for all the answers guys, i have picked HIS HD7850 2GB, from what i've seen it has amazing performance (outperforming GTX 560 ti's and HD 6950's) and in the same time the power consumption is ridiculously low (requires only 22A on 12V rail and 460W+ PSU)
Not to mention was super cheap, paid $265 + it has 3 years of warranty.

It's my first ATI card hopefully i wont be disappointed...

Having recently switched from a ATI HD5850 back in October to a GTX 570, I can honestly say that the game play and driver support is way better for Nvidia cards.  Take the advice of Arnie:
 
 "Send it back!!!! Neeeeooooooowwwww!!!"  (in a  Arnold Swarzennegger voice)

I know it is, that's why i was always owning a Nvidia GPU's.
But no choice in there, i want 2GB VRAM badly (Project C.A.R.S.), and in that price i can get a GTX 560 Ti (1GB VRAM) at best which is not satisfactory. 
And my PSU would barely run it, so it's no go.
 
I just hope the ATI drivers arent that complete screw up as i heard..
 
Also great avatar. 

Yes Nvidia is better definitely now, and last 3-4 years.
Almost all life I'm on AMD, 90% ATI.
Only 10% on Nvidia and GTX left good impresion on me. 
But I 'm very satisfied with 5870 2GB. It was powerfull card, now becomes week for gaming and next is NVIDIA.
NVIDIA try to make gaming like real life not AMD and I won't support such company at this moment. NVIDIA have vision not AMD.
But sometimes money is problem and you can't buy what you want. 
 

i have used a few amd cards and most of them have rocked and drivers were simple and easy to install and use 

Sorry guys i have 1 more question.
As i said earlier my PSU is ModXStream 500W (Dual 18A 12V rail)
Homever HD7850's has only 1 power connector, how is the power going to be distributed, will the PSU is going to deliver the 36A or only 18A ?
I'm little confused in there.
 
Sorry i know it's not appriopriate forums but someone might know answer, thanks.

Because of that I always use single rail 12V.

 

Looks like this card needs only about 10A on 12V i was wrong, anyways it's all i needed to know.

I think and my advice for you is to try to save some money for new PSU. Easy for few weeks, few months. Try to save 80$ and buy one good, reliably Bronze single rail 650W PSU from CORSAIR with enough Amps for everything and exactly W like they say.
Because PSU you faild to play almost on GTX580 performance. 
TX650 V2 is thing for 5-6 maybe 7 year it worth 80-85$.