So, yes clearly I made a stupid mistake and bought non crossfire card to go with my crossfire card. This is my original card is a SAPPHIRE Radeon HD 7770 GHz Edition Crossfire The new Card MSI Radeon HD 7770 GHz non crossfire. Now forgive some stupidity here as I haven't used crossfire since my Uber Edition cards. So I seen the Crossfire, enabled it ran benchmarks, checked usage, looks all good improved performance. So I decide to update drivers to 13.4, but I lose the crossfire option. After looking around and checking things I see the issue I have non crossfire card. I try Beta 13.5, no go 13.2 beta 7 no go. No crossfire options. However I can go back to 13.1 and I can enable Crossfire. Now along the way I notice I put my card wrong slot, move it to the 16x slot, I was in 4x. I test again crossfire enabled same result much more performance gain (obviously over 4x slot). I show GPU usage for both as I should, Afterburner shows results of like 1.9GB Vram being used. GPU-Z shows Crossfire Enabled 2 GPUs So I don't know how, or why. But its clearly working. The performance gains can't be denied by benchmarks when either card alone cannot perform that high. The only drawback is OpenCL is not working properly. Any thoughts etc? I can upload some screenshots/photos later if I need if there is disbelief.