Good NVIDIA Tweaking/Monitoring Utility

[userofcomputer]

Do any of you know any good Tweaking/Monitoring Utility for my GeForce 6800GT?
(BTW, congratulate me as I just finished my first build yesterday)

I installed the official nTune from NVIDIA, but it's not good at all, nothing to tweak with it.
What about RivaTuner?

And what about any good System Monitoring Utilities, I would like to see HDD and Northbridge temps. I've got a nForce 4 Ultra so it should work.

 

[xtknight]

RivaTuner is really good. nHancer is good for tweaking graphics settings.

Use MBM for motherboard stuff. Unless there's a sensor on your HDD, you can't monitor it, same with the north bridge. nTuner works for monitoring system temps.

 

[IceBreakerG]

Do any of you guys know if Riva Tuner will show you the current voltages as well? I've been having some system issues lately, and i'm on my 3rd video card right now (BFG 6800GT OC PCIe). I don't know if its a problem with my mother board (Gigabyte GA-K8NXP-SLI) or not. But i'd like to know what the voltage going to my card is. Also, what is the amount of voltage the card should be receiving anyway?