Connectivity
In the course of refreshing the ProBook 640, HP has extended the connectivity by a modern USB Type-C port (USB 3.1 Gen 1), but it has also, regrettably, axed two of the until now four USB 3.0 ports. The most aggravating thing here is that all interfaces are situated on the right. This is just as true for the Gbit LAN, headset, power socket, DisplayPort (4K suitable), and docking station port. From an ergonomic point of view, this is not really an ideal solution for users who connect a lot of peripherals and use a mouse on the laptop's right. Solely a VGA-out is situated on the device's rear.

SD Card Reader
Like most rivaling models (with exception of Dell's Latitude E5470), the card reader does not transfer data in the high-speed UHS II standard. The maximum performance of our Toshiba Exceria Pro SDXC 64 GB UHS-II SD card consequently settled to a bit below 90 MB/s

Communication
Intel's Wireless-AC 8260 module adds Wi-Fi and Bluetooth functionality to the ProBook. It supports the Bluetooth 4.2 standard and Wi-Fi 802.11 a/b/g/n/ac (2.4/5 GHz) and achieves gross transmission rates of up to 866 Mbit/s (2x2 TX/RX). We managed impressive download speeds of clearly over 600 Mbit/s with our router (Linksys EA8500) in ideal transmission conditions - much more is hardly possible with modern Wi-Fi adapters. The range and connection stability did not give reason for complaint in the test, either.