The mass market 720QM laptops have a very tight thermal / power envelope. You will notice for example over on newegg that there are 23 720QM machines there are no 820QM's. That is because both the power supply and the thermal management system are pretty much at their upset limit with the 720. Based upon calls I have made inquiring about the 820 option, the 820 / 920 are officially options on many of these machines, many vendors have backed off selling it for this reason.