Motherboard buying guide , type ATX, micro ATX vs mini itx Types of mother boards ATX, Micro ATX, mini ATX AT (Discontinued by ibm 12*80 ATX 4 RAM slots 4-6 Pcie slots more USB slots, hdmi 12*96 inches (rectangular design) 20 or 24 pin connector Several expansion slots 6 Micro ATX SIZE: 9.6*9.6 (Rectangular design) 3-4 pcie expansion slots 4 RAM slots More USB connectors 24 pin power connector Cheaper than ATX, Likely to fix smaller computer cases. MINI ITX Size 6.7 *6.7 inches *Some itx mother boards uses heatsink just like laptops no fan. *Less power consumption *1 pcile expansion slots 2 RAM Slots Few usb connnectors Mini ITX fixes designed for same micro ATX and ATX. BTX by Intel to improve air circulation for cooling But failed due newer chips & equipments. NLX designed by Intel fir low end low profile computers. EATX:(Gaming mother board) 8 RAM slots quad channel 5-7 pcie expansion slots More USB ports High quality sound Motherboard & processor sockets has to match. same generation motherboards & cpu tend to match. SOme motherboards also support for next gen processors. Just go to processor specs, find processor socket number. Find motherboards that supports the socket number. Usually same generation Intel core processors i3,i5,i7,i9 have same socket pin. Ex: AM4 for amd cpus Intel lga 1151 Over locking in mother board bios/uefi is also simple. All amd Ryzen series comes with over clocking. When comes to Intel we have pay extra price for unlocked version prefix with k. Ex: i10- 10080k Pcie slots used insert graphic cards. 16 lanes better and pcie 4th gen more speed. Pcie 5th yet to release as on date know more about pcie slots here. Pc cases size Not all cases supports all motherboard formfactors check the pc case size & specs as well. Things to consider before buying motherboard board Cpu & motherboard should have same matching socket ( know socket number) Size: more size more features & price PCIE slots with latest generation at least 3-4 *16 lanes M.2 slots for SSD does your mother board supports nvme protocols for faster SSD M.2 speed number of ports & latest gen usb 3.0 vs usb 2.0 hdmi v1.4 vs hdmi 1.3 thunderbolt, usb type c, pcie latest gen audio surrounding 7.0 etc Designed for cooling. Ram slots Sata slots for HDD. etc.