Where can I get a replacement fan for an ATI video card? The PN is 7120004100 from a S/N 230247024886 card.
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You need to tell us what card you have, the part number on the fan isnt meaningful without a manufacturer. Your best option is to replace the cooler on the card all together rather than attempting to replace the fan.
If you want to replace the fan, it would be easier to get an aftermarket cooler, they'll cost cheap...
I got a pair of 4870 stock fans for the original referance series cards.