I've purchased 4 of these m900q Lenovo ThinkCenter's over the past couple of months. There an exceptional value, especially if you need to put together a mini lab real quick and I  need to upgrade some IT Certs.I've had no issues loading Windows Servers 2012rc2 thru 2022, Solaris 8 or10. Linux Redhat & Ubuntu. All devices found, all drivers loaded during OS install.I'm running with NVMe drives in them all with an Intel core i5, and running Oracle VirtualBox minor virtualization without issue.One negative comment about the Q model, is there is not an audio port on the back. So if your KVM supports audio you'll need a USB audio jack.Mine came configured with 1, 8gb sodimm, so an easy upgrade to 24gb, by adding 1, 16gb. Upgraded all hard drives to 2tb Crucial NVMe, purchased here from Amazon. The M900Q, can take an additional 2,1/2" ssd drive -see the video.The computer includes a fully licensed copy of Windows 10 Pro, which is worth $140.00 itself.