I think there are some issues with 8800M GTX and drivers not original release.
The Core speed won't got to max.
I'm testing this at the moment (well with someone with a machine) to hopefully fix this bug.
Does the M1730 come with an Intel or Nv Chipset.
As SLi is a real bugger to work on Intel Chipsets with any other driver than the original.
This is due to nV/Intel SLi agreement and nV's paranoia of it's own chipset, and Intel needing a special in beween chipset to get SLi to work and a special driver that unlocks this chip.
As for Rivatuner it probably doesn't recognize your very new GPU in it's database, and why you see the things you do.
For me 174.12 is doing well.