This is a description of workhorse servers that can handle demanding workloads such as VDI, AI/machine learning, and private cloud. They offer flexible configurations with up to 16 x 2.5- or 8 x 3.5- drives, 8 PCIe slots, and 24 DIMMS (including 12 NVDIMM-Ns). They also support up to 50% more accelerator cards with up to 3 x 300W or 6 x 150W cards. The servers have industry-leading energy efficiency and multi-vector cooling to deliver correct air flow to each PCIe slot. The internal storage subsystem is optimized for M.2 boot.