Thanks @Squicker.
Tried the Factions mission today I reversed until I had most of the hyperspace jump points in view than just sat and watched the show. All 8 of the thread cores utilized to around 50%.
Frame rate around 58 FPS at worst. However the graphics cards were very unbalanced during this test, one was running at 100% while the other stayed below 50%??
Towards the end I noticed an Anaconda with a large amount of damage so I flew in close to have a good look. A few seconds after leaving it to fly on, the screen went black but the audio kept playing then another 5 seconds after E: D crashed, so I submitted the crash report as requested.
I assume it may be related to the GFX driver and the unbalanced cards. Strangely enough both card temps were still at around 70 degrees C, well within comfortable limits. However I am about to install the new Mantle enabled beta driver, might be a good test to see if this causes issues with E: D next week.