And this is the problem right here, CoH2 is very very demanding while not having omgwtf graphics.
When this game was released only the GTX Titan (GK-110 Chipset) Was able to run this on max settings/AA.
[...]wall[...]
see, i thought you were referring to something that rendered the game unplayable with SLI turned on, which the old texture corruption bug occasionally did (screen turns green because corrupted fog texture or skybox explodes and i can't see anything if my camera is more than 20 degrees off the ground...)
the shitty performance is bad but it's not an SLI issue. i have no idea what my frame rate is, i'm really bad at detecting low frame rates, but i have everything but AA maxed at 2560x1440 and i don't notice any issues without huge amounts of particles/snow. i think i get about 40 frames most of the time, which is fine for me.
UT4 Alpha hasn't given me any problems with Vsync and mouse.
!!!!!!
now this is exciting. i got into UT3 late in the game and never played earlier ones so i'm very excited for 4. i hope it doesn't flop like 3...