The i9 in a Macbook is going to throttle like crazy. Equally dumb idea is putting the i9 in an Asus Zenbook Pro 15..,(reply>), Sergy Olkowski Film on all cores at full load, that is excellent.. Can't expect more than that.,(reply>), yeah my quad core would stay around 2.8-3.1 underload. I had to document it to apple for the warranty,(reply>), The i9 has a base of 2.9GHZ, wow it's going to throttle hard at full load, probably close to 2.2GHZ i'd guess.,(reply>), Yeah.. how hard does it throttle? I assume it's rather new, might be a bit of dust on the heatsink you can blow out. I think of it as tricking the customer.. Sure the i9 can clock to 4.8GHZ on 1 core for a short time, but besides that it's going to hit the thermal limit and have the same power as the i7 version of the Macbook.,(reply>), My macbook pro throttled the 4 core cpu and I spent 3k+ on it.. after that I can never buy an Apple product for professional work.