Not as good as the A12X though.
Previously linked in A12X article.
https://arstechnica.com/gadgets/2018/11/apple-walks-ars-through-the-ipad-pros-a12x-system-on-a-chip/ GFXBench Metal 4 offscreen 383 / 201 ( T-Rex / Manhattan )
iPhone 11 benchmarks (with A12 ) same folks.
https://arstechnica.com/gadgets/201...ro-max-review-high-quality-for-high-prices/4/ GFXBench Metal 4 offscreen 275 / 139 ( T-Rex / Manhattan )
A12X Sling Shot 3.1 Graphics / Physics 13,224 / 4,686
https://www.anandtech.com/show/13661/the-2018-apple-ipad-pro-11-inch-review/6
A13 Sling Short 3.1 Graphics / Physics 8,677 / 3,527
https://www.anandtech.com/show/14892/the-apple-iphone-11-pro-and-max-review/6
The A13 is better than the A12, but still significantly trailing the A12X in graphics 'horsepower'.
The current Apple TV is limited by 3GB of RAM too ( the iPad Pro now has 4GB and optionally 6GB. New TV could at least get 4GB. ). Pushing 4K HDR screens more memory is probably going to help.
The Fan would help the A12X also and it is already ahead. The A12X also has an advantage in that the CPU die is not stacked on top the RAM inside the chip package. RAM is separate on the board. ( Not only a fan, but can cool the components better because they are spread out more. )
The size isn't going to make much of difference compared to the dongle alternatives it is going to compete with now (nevermind the100% integrated into the TV size reduction). The Apple TV app running on the top two streaming dongle vendors ( Roku and Amazon Fire) that market is pretty much toast for Apple. ( the below cost dumping of those this Black Friday and Cyber Monday, $30 and $25 respectively ... Apple isn't getting anywhere near that slugfest. That why they deployed the Apple TV app there. )
If Apple is going to lean heavily on the gaming differential then they'll need to keep the fan.