I never had a problem with Asus tweak utility with my Asus GTX 670, I found it did what I wanted without a problem.
But I don't push my cards to the point that it's flashing all sorts of colors, white spots and black screens
I think it's more of a problem with AMD 7 series and the R9 series from what other users in my area tell me.
EDIT: for you guys having inside case heating problems
I use a Corsair 650D case with the factory 200mm front fan blowing into the case from the front.
The rear fan is a
Noctua NF-P14-FLX 140mm Ultra Quiet Cooling Fan 750-1200RPM that use a round frame with the same hole-spacing as common 120mm fans and producing more airflow due to its larger diameter and its been installed backwards so it's drawing air in from the rear. I also use a silver-stone magnetic dust filter on the back as to keep dust down to a min.
The ACool 45mm thick dual fan rad is mounted to the top of the case and the Corsair SP 120mm fans are mounted on the bottom of the rad, so it's blowing heat from inside the case through the rad and out the top of the case. I know your all going to give me the shits about that
But in short, It works. I have the case closed up and If I hold an incense stick to the top of the case where the rad is it blows the smoke up, and if I move over just a bit where there is a gap from the side of the rad that's exposing dust n such to fall through don't! the smoke rises Why? because I've created kinda a neutral positive pressure inside the case and have no heating issues at all.
I ran furmark 15 min stress test with all fans on low speed and the gpu set on auto. It hit a max temp of 71c with the gpu fan speed reaching a max of 53% and the system was totally quiet for the run.
I'll see how well this fan setup works when I get home mid week after I install the 2nd gpu... things might change but I dont think by much. I have enough CFM at low speeds to be able to keep air moving around. The only thing I do notice is the motherboards vrm cooler gets a bit warm to the touch now but that's not an issue. A trim in the water line hear and an an add on hose there, will h20 the vrms but time will tell the story if I need to or not.