The Dell OptiPlex 3040 SFF is a pre-built business desktop computer first released in 2015. Although more than five years old, it is still a viable solution for home and office. The motherboard is using the H110 chipset and supports 6th gen Intel Core processor, 16GB of DIMM DDR3L-1600 memory, and a low profile GPU. You can even make a gaming PC form this machine with a proper GPU upgrade.
Dell OptiPlex 3040 SFF is a Small form factor computer. The Small Form Factor (SFF) is an in-between model. It has less space for the larger form factors (Mid tower, Mini tower, and Desktop), but it is still easily upgradable. Usually the SFF come with 2x PCIe slots, so fitting a low profile graphics card is possible.