This is the icon I was talking about :
I remember when I first ran starcraft II it was using the HD3000, it was slow and laggy (particularly when my laptop was on power saving or balanced mode - throttling of processor speed somehow changes the speed of the HD3000 too), Alt+tabbed and checked this icon and it was grayed out. Forced the GT540M to run it and the game was ok.
So, when Im running Saints Row TT, this icon is green and if you move/click the Optimus icon, you can see the SRTT icon in it.
Still havent tried to force it through nvidia's application panel or the high performance option in the menu. Will do it today (and close the Intel software too).
Now I know why gaming laptops dont include optimus technology..zzzz
The 3rd mission ( at the armory ) is not fun to play at all ._.