Raspberry Pi 3 B Usb Ports
The pi 4 has two usb 2 0 ports and two usb 3 0 ports.
Raspberry pi 3 b usb ports. The model a only has one while all the others have four usb 2 0 ports. Broadcom bcm2837b0 cortex a53 armv8 64 bit soc 1 4ghz. 2 4ghz and 5ghz ieee 802 11 b g n ac wireless lan bluetooth 4 2 ble. The original b had a 2 port hub ethernet controller the lan9512 which basically turned the 1 usb port on the processor into 2 ports ethernet.
The new b upgrades the lan9512 to the lan9514 a 4 port usb hub w ethernet. Gigabit ethernet over usb 2 0 maximum throughput 300 mbps extended 40 pin gpio header. The b s main improvement over the 2016 raspberry pi 3 model b is a boost to processor speed while the b shares the same quad core 64 bit cpu it has been clocked at 1 4ghz a 16 7 increase. In all models prior to the pi 4 the usb ports connect to a combo hub ethernet chip which is itself a usb device connected to the single upstream usb port on bcm2835.
You can connect just about any device to a raspberry pi via the port as long as the software or driver for it is available for raspbian os. The new pi has even more usb ports. 4 usb 2 0 ports. The raspberry pi 3 model b is the final revision in the raspberry pi 3 range.