Soldato
The 5850s I had were great cards, cool and very quiet, however, I PERSONALLY had a tough time with ATIs Crossfire drivers, nothing insurmountable admittedly, but none the less very annoying.
Changing driver sets constantly, flickering desktop images, DP not working with certain revisions (or ghosting double images), Alt tabbing to enable crossfire, crossfire not working when I changed options in CCC etc etc. I gave up around 9.12 after waiting for magic driver revisions and went 470SLI, far noisier and hotter, but for me, less hassle with far more options within the Control Panel.
I understand the scaling's improved with the 6 series, which is great, now if they devoted more time and resourses to getting a great control panel with lots of options to fault find (along the lines of the SLI load balancing graph and the ability to test different rendering modes) then I'd consider their Multi-GPU offerings again.
One thing that i have learnt from others with ATi is not to jump on a new GPU line & expect trouble free multi GPU implementation.
Multi GPU 1900, 3870, 5970 have been great as im always late to the party & make sure my shirt (Drivers) gets ironed out first.




