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Hi i have a question about power supply in watts if i upgrade to 3 gtx cards???.... right now i have a gtx 560 ti and a gtx 570, plus an i7 2600k,hdd 2 teras and a bluray with a 850 watts power supply and i want to upgrade to another gtx 570 so i will have 560 ti for graphics and part of rendering and 2 gtx570 for rendering what power supply i need to have that handle my system and the power of the cards?.

You need something of about 1000W with 6x 6pins.
See the PDF at the top of this linked page for SLI certified power supplies.
http://www.geforce.com/Hardware/PowerSupplies
A GTX470 has about the same power draw at 215W as a GTX570 (219W). A 560ti draws 170W or 210W for the LE.
Look down the 3way GTX470 column for candidates.
There are a number of 1000W and 1200W units there.
HTH

thanks pixel rush for the link information, i found there a calculator of your computer spec i really need 1000 w thats all i want to know.