http://extreme.outervision.com/psucalculatorlite.jsp
This is a good site for working out power consumption
I'd say it's pretty damn close. I plugged in my system and it's only maybe ~100W less than what it recommends.
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I run GTX470 at 500W system. Geforce recommends 550W.
You want to run GTX460 on 550W system. Geforce recommends 450W.
Source: Personal experience with GTX470 + OCZ ModXstream 500W PSU.
Source 2: Nvidia Geforce official web page.
http://www.geforce.com/#/Hardware/HelpMeChoose
Drag the Power meter to 450 and browse. The GTX460 should pop at 450W and dissapear at 400W.
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