OCC has published a review on the Sapphire Radeon HD 5870 Toxic 2GB

The Sapphire Toxic HD 5870 2GB takes off where the Vapor-X HD 5870 left off. Sapphire upped the ante by increasing the core clock to 925Mhz and adding another 1GB of GDDR5 memory clocked at 1225Mhz. This offers up a significant performance boost over the reference cards, for not much of an increase in price. With many HD 5870 cards selling in the $419 to $499 range on Newegg, the $449 suggested price point is more than fair for the benefits of enhanced cooling, custom construction and a nice factory overclock... with a warranty!

Sapphire Radeon HD 5870 Toxic 2GB Review