The Rack-Mountable Mac Pro (2019) models share identical internal components to their tower counterparts, but feature a different chassis design (engineered to fit into a 5U rack), have different identifiers, and initially retailed at a premium price.
This particular configuration, the Mac Pro "Eight Core" 3.5 (2019 - Rack Mountable) -- features a single 3.5 GHz Eight Core Xeon W (3223) processor with Turbo Boost reaching 4.0 GHz and 24.5MB of cache and originally was equipped with 32GB of RAM, a 256 GB SSD, and AMD Radeon Pro 580X graphics with 8GB of GDDR5 memory (as of March 8, 2022, Apple updated the standard configuration to a 512 GB SSD and an AMD Radeon Pro W5500X with 8GB of GDDR6 memory).
In its default configuration, connectivity options include two USB 3 ports (via a pre-installed Apple I/O card), four Thunderbolt 3 ports (two on the Apple I/O card and two at the front of the chassis), two HDMI 2.0 ports (on the video card), two 10Gb Ethernet ports and a 3.5 mm headphone jack with headset support along with 802.11ac Wi-Fi and Bluetooth 5.0. Additionally, additional connectivity can be expanded using PCIe expansion cards.