OCC has published a review on the Sapphire Radeon HD 5850 Toxic 2GB

As a factory overclocked card it is easily faster than the reference card by way of comparison. Cooling performance is another aspect that was measured since this card does use a non-stock cooling solution. Running with the factory clock speeds and letting the driver control the fan speed, the maximum temperature I recorded was 66=B0 C under load with a 39=B0 C idle temperature. The fan reached 43% utilization at this load temperature so you have both cool and quiet.

Sapphire Radeon HD 5850 Toxic 2GB Review