ATX PC peripheral power connector Used to power on PATA drives, CD-ROMs, add-on fans, extra video card power, supplemental motherboard power, case lighting.
ATX power supply connector v 1.x with 20 pin connector was widely used at PC motherboard. Replaced by v 2.x with 24 pin connector
SATA power connector Serial ATA specifies a fifteen-pin power connector. Slimline connector with six pins is used for some small form-factor applications.
DELL N750P-S0 (NPS-750BB A) server PSU 4x6 + 6 connector was very common in many DELL server PSU, but each has different pin map. Dell AA23290, AA23300, 7000814-0000, NPS700AB, NPS750-S0, 700815-0000 PSU's.
Dell Optiplex Mini tower power This is the pinout for the new style Dell towers that use 8 pin headers. The connectors are Molex 5557 and 5559 mini fit jr.
Dell Optiplex Power Supply Connector Power Supply Model HP-150SS / PS-5231. The plug is an ATX 20 pin plug, but it's incompatible with ATX standards (different pinout, no 3.3V)
HP Compaq SFF small ATX Power Supply Identical to ATX pinout, but use smaller connector and PSU form-factor is incompatible. HP 379349-001 PS-6241-6HF.