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Passivley cooled Gigabyte GV-R485MC-1GI HD 4850
http://www.provantage.com/gigabyte-technology-gv-r485mc-1gi~7GIG906P.htm
That's overkill. And even if it's passive, his system fans still need to remove all that heat.
what is the top rated quietest (both with and without fans)
He also stated it's not a gaming machine, so he wouldn't need a 4850. 4670 is the correct answer.
Might not be 'needed' but you can find a 4670 512mb at newegg for $44.99 AR. I mean do you really want to go for an even lower end card that'll cost around the same price any way?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121329&cm_re=4670-_-14-121-329-_-Product
Maybe. I mean a HD4670 will still produce more heat and take more power than a HD4350 right? If the tasks are simple, no reason for a more powerful GPU right? I mean why waste resources? But I get your point, HD4670's are cheaper now.