DriverHeaven posted a review on the Sapphire HD4870 TOXIC 1GB Graphics Card

Sapphire are the biggest AMD graphics card partner and a few months ago they released an overclocked version of the 4870 (Toxic edition) carrying a custom cooling solution. However, that version only shipped with 512MB of GDDR5 memory which wasnt ideal for the growing demands of high end enthusiast users.

Today were looking at a new offering from Sapphire based on the original 4870 Toxic. This edition now brings 1GB of memory to the table to combine with the pre-overclocked frequencies.

Sapphire HD4870 TOXIC 1GB Graphics Card Review