Dutch Guy, u are one luck SOB! lol! Been there the last 2 years. DV is my fave place in the world! lol!
Those are the clocks i have been running mine at since i got my card. I'd recommend manually setting the fan speed when u r about to start gaming, as i forgot to do this, Rivatuner didn't control the fans as i was expecting, and while playing F.E.A.R. i got artifacts and a whole system crash!! I set mine to 85-90% just before i start playing,then reset back to about 60% once i've finished and its cooled down a bit. It culd probably go further, but it seems happy and i don't think it needs pushing anymore.
Pastymuncher, i don't know about SLI mate, i only have a single card. Might be worth a try tho.