Can you tell me how many watts is it?

[Stavsavv]

http://

how many watts is it?

 

[MarkW]

Your link is only partially there... Use this page, it will give you a number.

http://extreme.outervision.com/psucalculatorlite.jsp

 

[Stavsavv]

so 400 volt are 400 watts?

 

[MarkW]

Volts and watts are very different animals.

I think this page explains it about as well as any I have seen, while keeping it simple:

http://www.helcohi.com/sse/body/hp.html