ASUS ROG Phone 6D Ultimate is a better-cooled ROG Phone 6 Pro in a different color shade, that's kind of the point. It's a way to see MediaTek's most powerful processor, the Dimensity 9000+, at work and to run Apex Legends Mobile in full detail. I'd say it's even better cooled than the ROG Phone 6 and the latest Nubia Red Magic phones tested, and that's even without the cooler on. And the battery life you'll see is very impressive.