FormulaMod Fm-24PPS 24-Pin ATX Power Supply Jumper Starter for Standalone Loop Leak Testing

FormulaMod Fm-24PPS 24-Pin ATX Power Supply Jumper Starter for Standalone Loop Leak Testing

TL;DR: The Fm-24PPS is a molded 24-pin ATX jumper that plugs into the main power connector of a standard ATX PSU and bridges the PS_ON signal to ground, so the supply turns on without a motherboard attached. It is the standard tool for leak testing a custom water cooling loop on the bench: plug the PSU...

Common Applications

The Fm-24PPS is a molded 24-pin ATX jumper that plugs into the main power connector of a standard ATX PSU and bridges the PS_ON signal to ground, so the supply turns on without a motherboard attached. It is the standard tool for leak testing a custom water cooling loop on the bench: plug the PSU into the jumper, connect the pump's SATA or Molex lead, switch on the PSU, and run the loop in isolation for the test period. The jumper is passive with no LED or switch, so the PSU's rear switch is the only on/off control. It is compatible with any 24-pin ATX power supply regardless of brand.

Frequently Asked Questions

Q: What is this jumper used for?

A: Powers an ATX PSU without a motherboard so the pump can run for a leak test, or the loop can be cycled before final hardware install.

Q: Will it work with any ATX power supply?

A: Yes, any 24-pin ATX PSU. Older 20-pin only PSUs need a 20-to-24-pin adapter; this jumper assumes a 24-pin connector.

Q: Does it have an on/off switch?

A: No. Use the PSU's rear rocker switch to power the loop on and off. There is no LED indicator on this jumper.

Q: Is it safe to leave running for a 24-hour leak test?

A: Yes. The jumper passively bridges PS_ON to COM. Standard leak-testing practice is 24 hours; monitor the loop and PSU temperature during the run.

Q: Does it power up the rest of the rig?

A: No, it only signals the PSU on. Components draw power normally from their respective rails (SATA, Molex, PCIe) once the supply is running.