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Usually, the standoff has a #6-32 UNC male thread on one end which screws into a threaded hole in the case or motherboard backplate and a #6-32 UNC female thread in the other end which accepts a screw to retain the motherboard. Less often, the standoff has a female thread in both ends and a second screw is used to attach it to the case.
Size 4-40 is used to receive jackscrews securing cable connectors to external computer ports, and size 6-32 is used for motherboard mounts. Dell, Inc. refers to standoffs that receive thumbscrews as "hex nut screws" and measures them with the metric system.
COM-HPC Size D PICMG: 2020 160 × 160 mm (6.3 × 6.3 in) Used in embedded systems. Requires a carrier board. Typically used for COM-HPC Server Type modules with 4x full size DIMM memory sockets. COM-HPC Size E PICMG: 2020 200 × 160 mm (7.9 × 6.3 in) Used in embedded systems. Requires a carrier board.
Inside a gaming case during gameplay. 360° photograph. A full tower case. Accessories shown include: a fan controller, a DVD burner, and a USB memory card reader.. Cases can come in many different sizes and shapes, which are usually determined by the form factor of the motherboard since it is physically the largest hardware component in most computers. Consequently, personal computer form ...
They also present a shorter variant named Mini-DTX which is smaller in PCB size of 8 × 6.7 inches (203 × 170 mm). [2] The specification provides for up to 2 expansion slots on a DTX motherboard, in the same position as the top two slots on an ATX or microATX board.
Baby AT motherboard An ATX Form Card, used by later Baby-AT motherboards to allow for USB, PS/2 mouse, and IR connectivity through headers. In 1987, the Baby AT form factor was introduced, based on the motherboard found in the IBM PC/XT 286 (5162) [2] and soon after all computer makers abandoned AT for the cheaper and smaller Baby AT form factor, using it for computers that spanned several ...
FlexATX specifies that a motherboard be no larger than 9 × 7.5 in (229 × 191 mm), and can have no more than three expansion slots. The term is used also for the form factor of a PSU that is smaller than a standard ATX PSU and is used in small cases that host a FlexATX or Mini-ITX motherboard or in thin rackmount servers such as 1U racks .
There was never any official LPX specification, but the design normally featured a 13 × 9 in (330 × 229 mm) motherboard with the main I/O ports mounted on the back (something that was later adopted by the ATX form factor), and a riser card in the center of the motherboard, on which the PCI and ISA slots were mounted.
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