4870 power supply question

You might get aways with it, but I would upgrade to something better ASAP...

I think thats cutting it a bit close.

thank you very much. I have another question now is it worth to buy some cheap 600 W PSU like Tracer or shall I wait for more money supply and get a decent one for 4870 like OCZ or Tagan? I just don't have enough money to get a good PSU now, I collected money only for graphics card upgrade =p

+1 obsidian86.
Cheap units often do not provide their claimed output and what they do give is poor quality power (in addition to stepping the mains voltage down the PSU also 'cleans' the output to provide a steady DC voltage, cheap units often fail to do this as well).
Also, the heavy OC on the CPU is going to greatly increase its power draw, another reason to get a good PSU first, then upgrade the card.

a good psu is a foundation to any system but have a look here http://game.amd.com/us-en/crossfir [...] s.aspx?p=3

There are many decent psu's around. Trouble is, unless you can see a review from a qualified reviewer, they are hard to identify. And if I tell you I had a Tagan 1000W cause random system problems in less than two months . . . or an OCZ that has been pumping power great for 5 years . . . what does that prove?

This is why most often there's a pat answer around here when someone asks about a good-quality psu: Buy an Antec (Earthwatts only), Corsair, PC Power & Cooling, or Seasonic. These *brands* (and the one specific Antec *line*) are known to be of high quality, and represent a safe recommendation.

For models from other brands, google the specific model plus the word "review" and read those that actually publish data from their own (a) examination of construction and (b) testing. Ignore all other "reviews".