I have to say I am unimpressed by just about all the non-reference coolers like the ACX. The reference design is actually really, really good - not only does it ensure good cooling of the card, it also makes all of the hot air get straight out of the case via the grille in the back plate.
In contrast, the coolers like the ACX dump all the hot air straight back into the case, which both reduces the cooling effectiveness (you are cooling with pre-heated recycled air) and makes everything else inside the case run hotter. This is a problem both with running multiple GPUs and power hungry overclocked CPUs.
Oh, and the resistor-across-the-EEPROM mod should work on non-reference 780Tis as well.