Well i have uninstalled the game and im in the process of reinstalling to see if that fixes the problem. Fingers crossed.
@ Arclight, I get what your saying reffence the VM bing to cores of 1Gb. Thanks for that mate. If this reinstall failes to clear up the problem. Il look at seeing if i can run the card in "single card mode".
@ stoneys-nutz, I had to running in crossfire but killed one of them a while back.
Edit: A reinstall of SH5 with the 10.3 drivers and the DVI - DVI cable attached and hey presto running just like before.
Thanks to everyone here who helped me get this sorted.