Worth buying a med-level card for mining in spare time?

[nazgulnarsil]

I currently have a nvidia gts250 that gets about 35Mh/s.  Would it be worth it electricity wise to buy a 5850 (200+ Mh/s) for $150 and leave it running when I'm not gaming?
$150 is 21 bitcoins right now, but having a nicer graphics card for gaming as well as being able to sell the card in the future is nice if BTC don't pan out.

How long would it take to generate 21 BTC with said 5850 using deepbit or another mining pool?

[1714015846]

1714015846

[1714015846]

1714015846

[arturh]

In order how much it costs you, you'll need a Wattmetter and your electric company's last invoice, to know the cost of kWh.

[nazgulnarsil]

so it's close enough in cost to buying coins to make it ambiguous.

[smooth]

try this

http://bitcoinx.com/profit/index.php

[fornit]

its not close, its an easy decision pro buying.
you dont have to buy components, you waste less electricity since you can still do everything except gaming (and very few other things) parallel to mining, it doubles as a gaming card, plus you can sell your old card. its profitable enough that even high electricity costs + a crappy inefficient psu wont change that.
be sure to check if it fits into your case though, the 5850 is not as long as its big brothers but its still a rather long card.