PCIe 8-Pin Power Cable Assemblies
The PCIe 6-pin and 8-pin connectors feed auxiliary power to graphics, accelerator and other add-in cards; the PCIe card specification allows 75 W through a 6-pin and 150 W through an 8-pin. A 6+2 plug splits so one lead can serve either socket. Both use a 4.2 mm pitch housing and are keyed against the CPU 8-pin, which looks similar but carries a different pinout. Our manufacturing partner builds PCIe power assemblies to your drawing, from single leads to splitters and adapters.
Where PCIe 8-pin assemblies are used
Add-in cards in servers
Power for GPUs, accelerators, capture and network cards that take a 6-pin or 8-pin feed.
Industrial and embedded PCs
Short leads inside rack-mount and fanless industrial computers, where the card sits close to the supply.
Splitters and pigtails
One supply output to two cards, or a second plug on the same lead, laid out to your drawing.
What you can specify
Each point is confirmed with our manufacturing partner before the quotation. Connectors are the genuine parts your drawing names, and an alternative is used only with your written approval.
- A 6+2 plug or a fixed 8-pin plug at the card
- Single leads, pigtails or splitters
- The supply end, to the pinout of your power supply or board
- Lengths, wire gauge and wire colors
- Sleeving, braid and labels
Testing and records
Every unit gets a continuity test — right pin, no open circuit, no short — and ships with a test report. Hi-pot, insulation resistance and pull-force testing follow the plan agreed in your quotation.
Pin positions are checked against the PCIe pinout on your drawing, so a lead cannot leave wired like a CPU 8-pin.
How testing and records work →How much does each pin carry?
Model the six 12 V pins and six returns of a 12V-2x6 or 12VHPWR connector as resistors, solve how the current really shares, and read each pin's current, each contact's heat and the margin left against the per-pin rating, a worn or open pin included.
Open the per-pin current calculator →Common questions
Can a PCIe 8-pin cable plug into a CPU 8-pin socket?
It should not, and the keying is there to stop it: the two connectors put 12 V and ground on different contacts. A cable that has to bridge the two is built as an adapter, to a drawing that shows both pinouts.
Why use a 6+2 plug instead of a fixed 8-pin?
A 6+2 lets one lead feed a card with either socket. If every card in your system takes an 8-pin, a fixed plug is simpler and cannot go in with its two-pin section out of line.
Do you build modular power supply cables?
To your drawing, yes. Modular supplies do not share a socket pinout, so the drawing — or the supply's documentation — has to give it, and the quotation confirms the parts at both ends.
What should a PCIe power cable RFQ include?
Lengths, both end connectors with part numbers, the pinout at the supply end, wire gauge and colors, 6+2 or fixed plug, any splitter layout, labels and quantities.
Related connectors
Industries
Connector and series names on these pages — JST, Molex, Micro-Fit, Mini-Fit, PicoBlade, Pico-Lock, CLIK-Mate, PCIe, MCIO, SlimSAS, OCuLink, HSD, HFM and DEUTSCH among them — may be trademarks of their respective owners. They are used only to identify the connectors an assembly is built with or mates with. Interconnix is not affiliated with, sponsored by or an authorized distributor of any connector maker.