yeah, i have an m17x as well, R1 running dual 260ms and no, it doesn't seem to be using SLI or both of my cards.
The only way i got around it was using the same fix that was offered for beta
You can find it on this thread http://ffxiv.zam.com/forum.html?game=268&mid=128209577296288344&howmany=50
The problem is, you have to use the 258.96 drivers. and for other m17x users as well as myself (you can confirm this in notebookreview forums) the mobile version offered by nvidia runs really buggy, with random video freezes/crashes, etc. it doesnt happen all the time, but it can happen and get very annoying, they definitely do not run as well as the ones offered by Dell.
However, for now it's a trade-off. I get better performance and SLI is working. If it gets too bad with the buggy drivers, I'll just revert to the Dell drivers and use the one card until another fix shows up; it doesn't really run too bad on the one card. Just bugs me that I'd have to use the one, when I have 2 available =/.
Hope that helps! Edited, Sep 25th 2010 10:50pm by InchKujata
FFXIV: Kendall Lawliet, Lindblum Server
FFXI: Inch 75 bst / 75 thf / 75 blm
and others not worth mentioning.
Sore WOW . Level 49 Undead Mage. Boulderfist Server.
Inchy:SMN 69/WHM 46