Ok I got the HR-03/R600 and so far notice a in Voltage regulator current from roughly 40.45C at idle to 25.74C at idel. That's a whopping 14.71C drop (roughly not an exact depending on ambient temps). Because R600 doesn't go into 3d mode using RTHDRIBL I am still testing. But will post results soon. However. It appears that the PWM, mosfet heatsink along with the memory mosfet heatsink is really doing it's job (and its alu not copper!).
Here are some pics
Before the install of HR-03/R600 heatsinks only
After HR-03/R600 install of heatsinks only
Take a look at what I circled. These items apparently needs to be properly cooled. As you look at the pic below you will see that the pwm sink will cover them.
Take note of the extended "arm" on the row of ram sinks to the left of the GPU. It covers 2 other vital components that need to be cooled. One is a pwm I am not sure about the other component.
This photo shows the Arctic Silver Cleaner, the name of the video card heatsink and overall photo of the R600 with the memory/pwm (mosfet) heat sinks
This photo shows the rear of the R600 and the memory ram sinks.
Side note:
ATI ram sinks are notorious for having oil on them from the pads used (at least for me). Using arctic silver cleaner did a much better job at removing the oil (which prevents double adhesvie tape from sticking to the ram) then using rubbing alcohol alone.