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Whilst sharing much with it’s older siblings Micro-ATX & Flex-ATX, mini-ITX is actually quite different in some very important ways The maximum mainboard size is only 170mm x 170mm, where Flex/Micro-ATX can be much bigger.A Mini-ITX PSU is less than 100 Watts.Mini-ITX is backward-compatible with both Flex-ATX and Micro-ATX.
