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Cable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable, 4 Inches | PCIe Power Cable, 6 Pin Female to 8 Pin Male, for Compatible Low-Power Graphics Cards and Power Supplies
Cable Matters

Cable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable

Bottom line: The Cable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable: Ships as a 2-pack, so you get a spare adapter for a second build; main trade-off: adds no wattage or current capacity - PSU must already meet GPU draw.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Ships as a 2-pack, so you get a spare adapter for a second build
  • ✓ Latching 8-pin male connector resists accidental disconnection
  • ✓ Keyed 6-pin female housing enforces correct alignment on insertion
  • ✓ 4-inch length keeps the adapter tucked behind the card, not looped in airflow

Cons

  • ✗ Adds no wattage or current capacity - PSU must already meet GPU draw
  • ✗ Not compatible with CPU/EPS 8-pin motherboard ports
  • ✗ Limited to compatible low-power GPUs, not high-draw modern cards
  • ✗ 4 inches leaves little slack for routing in large or bottom-mount cases

Manufacturer description

The Cable Matters 6-Pin to 8-Pin PCIe GPU Power Adapter Cable solves a specific bench problem: your power supply offers a 6-pin PCIe plug, but the graphics card wants an 8-pin input. This 4-inch adapter bridges that gap with a keyed 6-pin female housing and a latching 8-pin male connector, so the link stays seated once the side panel goes back on. Cable Matters ships it as a 2-pack, which means one adapter for the build and one for the spare parts bin or a second system. Be clear on what this cable does and does not do. It changes the connector shape only. It does not raise your PSU's…

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SpecPicks Verdict

SpecPicks scored Cable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable using a rating × review-volume × price-fit model applied to published specs and reviews across the retro graphics & video category. Cable Matters's retro graphics & video lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for retro graphics & video of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Will this adapter let my 6-pin power supply run a card that needs 8-pin?

Only if your PSU and its 6-pin PCIe connection already supply enough power for that card. The adapter changes the connector from 6-pin to 8-pin but does not increase PSU wattage, current capacity, or available power. Check the documented power requirements of both the PSU and the GPU first.

Can I plug this into the 8-pin CPU power socket on my motherboard?

No. Cable Matters states this adapter is not compatible with CPU/EPS 8-pin ports. It is a PCIe power adapter for the 8-pin PCIe input on a graphics card only.

How long is the cable and how many do I get?

Each adapter is 4 inches long and it ships as a 2-pack, so you can use both in separate compatible systems or keep one as a spare.

Which graphics cards does it work with?

It is intended for compatible low-power graphics cards with an 8-pin PCIe power input, including select Gigabyte, Radeon, and Sapphire models. Confirm your card's connector type and documented power requirements before ordering.

Will the connection stay seated once the case is closed?

The 8-pin male connector uses a locking latch and the 6-pin female connector uses a keyed housing to support proper alignment and help prevent accidental disconnection.

Key Features

  • 6 Pin to 8 Pin PCIe Adapter: Connect a 6-pin male PCIe power plug from a compatible power supply to the 8-pin PCIe power input on a supported graphics card. Confirm the connector types before ordering
  • For Compatible Low-Power GPUs: Use the PCIe power adapter only when the power supply and its 6-pin PCIe connection provide sufficient power for the graphics card. Check the documented power requirements of the PSU and GPU before installation
  • 8 Pin to 6 Pin PCIe Adapter: The GPU power adapter changes a 6-pin PCIe connection into an 8-pin connector but does not increase the PSU wattage, current capacity, or available power. It is not suitable for bypassing GPU power requirements
  • Secure PCIe Connections: The 8-pin male connector features a locking latch, while the 6-pin female connector uses a keyed housing to support proper alignment and help prevent accidental disconnection
  • Convenient 2-Pack: Use the two PCIe adapter cables with separate compatible systems or keep one as a spare. Compatible with select Gigabyte, Radeon, and Sapphire graphics cards with an 8-pin PCIe power input. Check the GPU power requirements before use. Not compatible with CPU/EPS 8-pin ports

Full Specifications

BrandCable Matters
ColorBlack
Gauge18
Model104042x2
Wattage75
Cable Typeproprietary
Item ShapeRound
Item Length4 inches
Part Number104042x2
Connector Type6-pin Pcie, 8-pin Pcie
Number of Pins14
Maximum Voltage50 volts_of_direct_current
Special FeatureSecure Connection
Connector GenderMale
Compatible DevicesComputer
Indoor Outdoor UsageIndoor, Outdoor
Customer Package TypeStandard Packaging
Ethernet Cable CategoryCat 5
Recommended Uses For ProductPowering Graphics Cards in Computers
External Testing CertificationNão aplicável
Full listing titleCable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable, 4 Inches | PCIe Power Cable, 6 Pin Female to 8 Pin Male, for Compatible Low-Power Graphics Cards and Power Supplies

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Cable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable, 4 Inches | PCIe Power Cable, 6 Pin Female to 8 Pin Male, for Compatible Low-Power Graphics Cards and Power Supplies is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Cable Matters 2-Pack 6-Pin to 8-Pin PCIe GPU Power Adapter Cable, 4 Inches | PCIe Power Cable, 6 Pin Female to 8 Pin Male, for Compatible Low-Power Graphics Cards and Power Supplies
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