As in the title is the extra VRAM any use
Here is the link
http://www.computerbase.de/2014-05/sapphire-amd-radeon-vaporx-r9-290x-oc-4gb-vs-8gb-test/?utm_source=newsletter-webarticle&utm_medium=email&utm_content=html&utm_term=content-title&utm_campaign=newsletter-webarticle
Here is the link
http://www.computerbase.de/2014-05/sapphire-amd-radeon-vaporx-r9-290x-oc-4gb-vs-8gb-test/?utm_source=newsletter-webarticle&utm_medium=email&utm_content=html&utm_term=content-title&utm_campaign=newsletter-webarticle