content: Pools GPU but you only get to use VRAM from the main card. I have (2) 2GB R9-290s... and when running in crossfire SUPPOSEDLY I can only use 2GB. However, in GTA V, I tell it to ignore memory limits and my settings push VRAM usage to over 3GB... never had a crash. Witcher runs pretty awesome on this setup. Just about maxed all settings and smoooooooth. I've got an i5. edit... GPU, not CPU lol