https://wccftech.com/shuttle-introduces-new-3-liter-pcs-for-intel-8th-gen-processors/

Suprisingly Shuttle has not updated their XPC slim series which has primarially been known as their 3 liter format, has not offered support for Intel’s Socketed 7th generation Core processors. This range is finally being expanded by the new XH310 and XH310V models. I would assume the 9th gen support is a ways off due to pricing and power needed, we also have recently covered Shuttles updated lineup here.

The models with a 3-liter volume are the largest and therefore most flexible ones in the XPC slim series. They are based on the Intel H310 chipset and support Intel processors up to 65 Watts of TDP for socket LGA1151v2. Up to 32 GB DDR4 memory can be used in both devices.