Thanks friend, so I have to find out any ATI 5830 or 5850 now !
Once again, thanks for all !

Thank you for your comment ! Is there anybody using laptop with ATI 5830 as HP ENVY 15 INTEL CORE I7 720QM for mining ? I think laptop always consumes less power than desktop, but how is about performance of laptop's ATI 5830 VGA ?

thanks all for your good advice. But I can not find any Ati 58XX on the market. Can I consider an ATI 6870 ?

 :)Hi everyone, I'm a newbie, I am very pleased to know all of you. I've just known about bitcoin. I've already got a PC as :
- Mainboard : Asus M2N68-CM
- CPU : AMD Athlon 64X2 4800+ ( 2.5Ghz X 2 )
- GPU : Asus EAH5570 SILENT/DI/1GD2
- HDD : Seagate Barracuda 320 GB
- Power Supply : Cooler Master 450W
- Ram DDR2 : 2GB - 800 Mhz

Please advise me can I start to mine bitcoin with that PC ? How much I can earn a month with that GPU ?
I am looking forward to hearing from you soon.

Thanks & best regards,

Betcialist