hmmmm i did not notice slower clocks with my a3 gts
stock volts 675 playing moh a for a few hrs.
with the zalman 699 24/7 np,but have not tried the hr-03.
if its the money yes its quite pricey
in sli i can slip a fan(2x90mm) under the bottom card now which i cuold not do with stock h/s.
i think it pays off with good temps at higher volts(1.48)load no where near 75c like stock fan,(66)and seems to have much better post load temp back down.
but heatsink reveiws are all about amb temps so....two or three c differance means alot to out come.
BTW it looks smoking hot on the black pbc...i know looks are not everything