35W Limit on PCIe x16 slot: Optiplex 790 SFF | DELL Technologies
They typically only include a single PCIe slot, two RAM slots and limited connectors for storage devices. Despite their small size, many Mini ITX motherboards ...
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You will also not find no more than 2 RAM slots on the typical mini-ITX motherboard, which decreases the total amount of memory you can have in your system compared to an M-ATX board (4 slots).
Before Buying an ATX Motherboard, You Should Know These Facts
One of the most important differences between Mini ITX and the two ATX motherboard types is the number of RAM slots that the motherboard comes with.