Something to check with tech support. If the 8790's have this bios, then the GX7's should be able to use it too and all it would take is having Hypersonic certify it works with no glitches on our systems - since they are basically the same.
The BIOS upgrade that was put on mine either has the kick in or max. I keep mine on max all the time (keeping it mostly at 35 celsius. The ramp up would be cool, but I like not giving the system a chance to heat up (except for gaming and then you should be using max anyways).