Here's the fix for controlling the fan speed. I'm sure Rivatuner or Ati Tray Tools will support the HD48xx series soon.
I suggest you try that fix before buying an aftermarket cooler, because the stock cooler pushes the hot air outside of the case, and aftermarket coolers don't.
But if you're not satisfied with the temperature, Hardware Canucks tried a few coolers on the HD4870 with great results.
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