If you run a monitor program like HWinfo64 you can see many different temperature readings that can presumably cause throttling (undisclosed), not just the CPU and the GPU. In particular, check the package power and various throttling flags. The heatpipes and fins and presumably the power supply too are undersized to support max spec combined CPU and GPU operation under longer heavy loads (but you have to follow Frank Azor's tweets to learn this, as it isn't stated in the specs). Also look up "9560 thermal insanity FLIR". If you game, it is highly recommendable to put thermal pads on VRM mosfets.