Features
Small form factor computers are generally designed to support the same features as modern desktop computers, but in a smaller space. Most accept standard x86 microprocessors, standard DIMM memory modules, standard 3.5 inch hard disks, and standard 5.25 inch optical drives.
However, the small size of SFF cases may limit expansion options; many commercial offerings provide only one 3.5" drive bay and one or two 5.25" external bays. Standard CPU heatsinks do not always fit inside an SFF computer, so some manufacturers provide custom cooling systems. Though limited to one or two expansion cards, a few have the space for 3/4-length cards such as the GeForce GTX-295 Most SFF computers use highly integrated motherboards containing many on-board peripherals, reducing the need for expansion cards.
Even if labeled "SFF," cube-style cases that support full-sized (PS2 form factor) power supplies actually have a microATX form factor. True SFF systems use TFX or smaller power supplies, and some require a notebook-PC style external "power brick."
Some SFF computers even include compact components designed for mobile computers, such as notebook optical drives, notebook memory modules, notebook processors, and external AC adapters, rather than the internal power supply units found in full-size desktop computers.
Read more about this topic: Small Form Factor
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