To give you an idea what I mean,my Leadtek GF2 Ti has hardware monitoring of temps etc,however I`ve to install the Leadtek driver software to use it,with the reference(using 43.45 at the moment) Nvidia drivers I don`t have the option but it`s really a minor issue and the stability and layout of the Nvidia drivers which I like, more then makes up for it.
Btw I`ve just checked Leadtek`s website and they are still listing 31.xx drivers for my card,so you can see by using Nvidia drivers you will always have the newest and latest version a lot quicker.