motherboard: unknown. It says Compaq (no longer in existence) but I can't remember now if Compaq made their own mobos or farmed out to jobbers.
Most likely this is befpre the Pent 386 or 486 era computers, but after the old AT and XT computers were current. 1980's.
I will tell you this is came from a DOS machine, and unless you are willing to learn archaic DOS commands and try to find ancient programs to run on it, it is useless for anything.
The ROMs and RAM are definitely from the 1980s, but the Compaq hardware is from around 1996.
That is a Pentium (socket 7) motherboard. It is a weird form factor, and it will probably require the original Compaq case and power supply. The smaller board in the motherboard picture is the L2 cache. It could be upgraded back then. Later, it was soldered to the motherboard and eventually integrated into the CPU.
The PCI card is an early PowerVR 3D accelerator. It only handled 3D graphics, so a normal video card was required for everything else. The motherboard, CPU, and this card may have come from the same computer.