A GPU is a Graphic card.
Here is what I recommend for a high quality starter rig at low cost.
ASRock H81 ProBTC V2.0 Motherboard - These are made for mining (hence the term BTC even though you cant mine BTC on GPUs anymore - you could when this mobo debuted). It has 6 PCI-e (Graphic card) slots.
Intel G1820 (or 1840 or 3220) CPU
16-32 GB SSD
4GB DDR3 RAM or more
GetPimP.org’s bootable mining platform which now includes ZCash
RX 480 graphics card(s)
Corsair or EVGA 850-1000W power supply.
PCI-e risers
and a Mining Rig frame. I build these: