Scan Line Interleave - SLI for short – describes the function that allows several graphics cards to operate within one computer. The 3dfx company first deployed SLI in 1996 to increase the performance of its Voodoo graphics cards. Today the term SLI is always used in relation to graphics card maker NVIDIA. SLI divides the graphics performance between two graphics cards running in one computer. This permits improved graphics performance.
Single Rail (operation)
Most power supplies separate the 12V current into several rails. Single rail refers to an operational approach that uses one undivided 12V rail. This has the benefit that more power is available at once through a rail. The disadvantage is the potential for collapsing voltages under high loads.
S-ATA is an extra plug connection for a computer. The S-ATA plug is primarily used for drives and has almost completely replaced the 4-pin Molex plug. Unlike the 4-pin Molex plug, the S-ATA plug has 15 pins and can deliver three different power supply voltages. It is also flatter than a Molex plug.
SCP stands for "Short Circuit Protection" and represents an important protective function for power supplies. If a fault leads to a short circuit in the computer, the SCP function switches off the power supply to prevent additional defects to the hardware.
SFX stands for "Small Form Factor" and is a type of form factor. SFX power supplies have a different casing form and are significantly smaller than normal ATX power supplies. This requires smaller fans as well. The underlying technology is no different from that of ATX network components. They are primarily used in small casings, such as for multimedia computers.