Sapphire is preparing to push a very interesting product. This new offering according to TechConnect will be a 1GB Radeon HD4870 with a Vapor-X cooler and will be part of the Toxic line up.
Specs on the card are anticipated to be similar to the current HD4870 512MB Toxic card.
Read more here.
In terms of clocks, the upcoming card likely resembles the 512MB Toxic version and has a 800 Stream Processor-boasting 55nm RV770 GPU set to 780 MHz (750 MHz stock) and a memory frequency of 4000 MHz (3600 MHz). The Sapphire Radeon HD 4870 1GB Toxic Edition should reach stores in the coming weeks. No word on pricing.