Hello to everyone I'm new to this forum! I found here this great RBE tutorial which was very helpful to me. Just the Powerplay settings with their linked ten clock infos remained unclear to me. It was not really obvious under which conditions which powerplay state is applied in connection with low, medium and high mode. So I flashed a Bios on my HD 3870 with "color marked" clocks, which means that i use ten different clock settings with wide spreads between them. Afterwards I ran Windows with several applications and monitored the GPU clock with the Rivatuner in order to determine the applicated power states and the related modes. My HD 3870 is equipped with the following states: State 0 - Boot State 1 - Power savings for notebooks, high performance, optimal performance, overdrive template State 2 - Power savings for notebooks, high performance, optimal performance State 3 - UVD Now to the results: In idle mode (desktop, office, firefox) the card is running in State 2 in low mode. It does not make any difference if Aero is activated or not (I use Win 7 64 bit as OS). Sometimes there are short leaps in idle to medium mode, but they last only for one two seconds, are not reproduceable and do not depend on GPU load. In 3D applications like games (Bad Company 2, TW 08) or Furmark the card remains in State 2, switching to high mode. State 3 is activated when replaying HD videos, immediately applying high mode, just switching temporarily into low mode when winding back or forward. When replaying Youtube videos or other non HD video sources (especially TV series episodes sized appr. 370 MB), the card remains in State 2 low mode. Whether the checkbox "enable Ati Overdrive" in the CCC is activated or not, the card remains in State 2. If the card is being overclocked by CCC, the clock set in CCC is applied instead of high mode in State 2. I was not able to shift the card onto State 1. The only evidence of State 1 is that its medium mode is the new lower bound of GPU clock in the CCC Overdrive tool. So it would be very interesting to find out what this overdrive template is, which is the difference between State 1 and 2, and under which conditions it is applied. Additionally I would like to know under which conditions the medium modes are applied. The hitherto expressed assumption is that it consists with Windows Aero, but I didn't find any clue for it as enabling and disabling Aero doesn't make any difference. So I look forward to here your ideas!