Sapphire Radeon R9 290X Vapor-X 8GB and 4GB review: is 8GB useful?
 

AMD recently announced its hardware partners could start offering their own versions of the Radeon R9 290X with 8GB memory. Sapphire was the first (and as of yet the only) to be able to offer us a 290X with 8GB memory, namely the Sapphire Radeon R9 290X Vapor-X. We put the graphics card to the test and compared it to the 4GB edition to find out whether the added 4GB has a sizeable impact or not.

http://uk.hardware.info/reviews/5913...-is-8gb-useful