Iria

Sapphire has become known for it's TOXIC Edition cards which use their Vapor-X cooler with vapour chamber technology for better cooling but this 4870 TOXIC also features three large heatpipes and a thermally controlled fan which run quiet in all of our testing. We tested this with Crysis GPU benchmark set to run on a loop at 1920x1200 at Very High Settings and using ATI's Catalyst COntrol Center we measured a temperature of 63 degrees Celsius after ten minutes in the loop. This is cooler than some 4800 cards run at idle so this is a big win for Sapphire. At idle in the desktop we measured the card at 51 degrees Celsius. Excellent all around.
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Source: AMDZone
Check out our 4870 reviews here