Second block installed, all back in the case leak testing:
http://i720.photobucket.com/albums/w...dslibridge.jpg
Up and running :D
http://i720.photobucket.com/albums/w...darksideon.jpg
Temps are real nice, both cards mem/vrm almost identical, second cards core ~2*C hotter but its running slightly more voltage too. ~42-44*C core. 44*C mem, 50*C VRM after extended gaming.
The mem or mem controller on my new card was sensitive to heat, but I've now got both cards at +900 MHz (3911 MHz / 7822 MHz effective) running stable in games. 250 GB/s bandwidth, don't think they'll be bandwidth starved with that :)
** Apologies for that awful exposed cabling, I'll be sleeving it soon!