CPU up to 3 Times Faster
The most noteworthy change on the new pi 4 board is the 1.5GHz quad-core ARM Cortex-A72 CPU. It has a 3x performance boost over the previous model. It delivers a 500Mhz speed allows for more processing power while using less energy
Update Bluetooth 5.0
It has the biggest connectivity upgrade from Bluetooth 4.2 to Bluetooth 5.0 when comparing the Raspberry Pi 4 with Pi 3B; The new standard offers quadruple the range and roughly double the speed over the legacy option. Plus Bluetooth 5.0 uses much less power than Bluetooth 4.2
Dual Displays, 4K Output
Video capabilities also see a big leap with the Raspberry Pi 4, you can get 4K support now (4K/60fps). You also have dual 4K monitor support via a pair of micro HDMI ports (Come with 2X Micro HDMI to HDMI Cable).
2 USB 3.0 & 2 USB 2.0
The new model pi 4 equipped four USB ports, with two of them sporting USB 3.0. This is a notable upgrade over the last model, which only featured four USB 2.0 ports, give you a better experience.