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Running other things off the PC power supply. Where do you draw the line?
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BadMouth:
I have this 430w power supply: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026&Tpk=corsair%20430
Which, going by the specs says the 12V rail can handle 28A.

It's going to be powering only:
                A 95w cpu (95w)
                2GB DDR2 (30w)
 WD black hard drive  (11w)
           Nvidia 8600GT(47w)
       Budget mobo      (50w?)
----------------------------------
                     Total     233w plus a keywiz, coin door LEDs and maybe an led marquee light.

I plan to rotate the monitor using a 12v linear actuator that has a max draw of 3.5A, but the monitor will be riding on bearings and shouldn't require much force to move, so I doubt it will ever pull that much current.  Using an online calculator, maximum possible draw comes out to 42w.

Would it be ok to power the actuator from the PC power supply, or would that be a recipe for disaster?
Should I still be leary of doing this even with a bigger power supply?



Dervacumen:
Seems reasonable to me but I always overbuild so I'd probably go with a larger PS.  Remember the manufacturers give numbers that are lab tested under ideal conditions.  You'll see higher draw, likely.  What's the difference in cost for a larger PS?  Is it worth the PITA when you have to troubleshoot the whole system if something goes wrong?  Not trying to scare you, just think about that.
P-chan:
Buy a 2nd cheap PC powersupply and use it strictly for the motor?  This one is $15 shipped and has decent reviews.  Small price to pay for piece of mind, IMO. 

http://www.newegg.com/Product/Product.aspx?Item=N82E16817152019

kahlid74:
Your calculations look good so I would think you'd be fine powering it off the same PS.  The only thing I would be concerned with is how good of quality the PS is.  That actuator could produce noise that the PS can't filter and in turn could drive it back to your PC potentially damaging your components.  So I'm not worried about the PS being powerful enough to handle it, I'm more worried about what could come back through the PS to damage the computer.
Vigo:
What, no Cuisinart and shoe buffer running off of that power supply as well? Wimp!
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