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A PCIe 6-pin GPU power connector is conventionally rated for up to 75 W of auxiliary power; an 8-pin is rated for up to 150 W. That difference does not, by itself, tell you whether a graphics card will work with your power supply: check the exact card’s connector requirements and the PSU’s documented output and cables. A 6-pin-to-8-pin adapter is not a universal fix.
What changes between PCIe 6-pin and 8-pin?
The 8-pin connector adds two positions and uses sense-pin coding that lets a compatible graphics card identify the connection. Under conventional PCIe classification, the 6-pin connector allows up to 75 W and the 8-pin up to 150 W from that auxiliary connector. These figures describe the connector allowance, not the total power consumption or rating of a graphics card.
| Connector | Conventional auxiliary allowance | Positions and sense arrangement |
|---|---|---|
| PCIe 6-pin (2×3) | Up to 75 W, per PCI Express Card Electromechanical Specification Rev. 3.0 (2013) [NVIDIA-hosted specification copy] | Three +12 V positions, two grounds, and one sense position [NVIDIA pinout guide] |
| PCIe 8-pin (2×4) | Up to 150 W, per PCI Express Card Electromechanical Specification Rev. 3.0 (2013) [NVIDIA-hosted specification copy] | Three +12 V positions, two sense positions, and three grounds [NVIDIA pinout guide] |
The PCI-SIG specification copy cited here is Revision 3.0 (2013), hosted on an NVIDIA developer forum; it is supporting specification material, not a claim that this is the newest revision. Card power also depends on the PCIe slot, all auxiliary connectors, the card’s design, and the manufacturer’s instructions.
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How do the pinouts and sense pins differ?
The 6-pin provides three +12 V positions, two ground positions, and one sense position. The 8-pin provides three +12 V positions, two sense positions, and three ground positions. An 8-pin card header can use the sense-pin states to distinguish an 8-pin connection from a 6-pin one and limit auxiliary draw accordingly.
#1 Best Overall
- Compatibility Warning: This male-to-male 8-pin PSU to 6+2-pin PCIe/GPU cable is compatible with Corsair Type 3, Type 4, and select other PSUs with matching pinouts. It’s NOT compatible with EVGA PSU, Corsair RM850X Shift series, or other PSUs with different pinouts. Modular 8-pin layouts vary by brand/series—physical fit ≠ electrical match. Always verify your PSU’s 8-pin connector shape and pinout diagram before purchase. Using an incompatible cable may cause power failure or hardware damage
- Reliable Power Solution: Connect an 8-pin (EPS/ATX) male PSU connector directly to a 6-pin or 8-pin PCIe/GPU slot on your motherboard or graphics card. The cable effectively converts EPS power to PCIe power for secure and efficient delivery. Ideal for setups requiring additional power-routing flexibility while preventing power-related system issues. Note: Pin 4 on the PSU side is intentionally unused, and Pin 5 on the GPU side is double-wired to ensure stable 12V output.
- Graphics Card Compatibility: Perfect for powering high-performance graphics cards, this cable features a 6+2 pin PCIe connector that can be used with both 8 pin and 6 pin GPU interfaces, making it a versatile solution for varying power requirements.
- Easy Installation: With a 2ft length, this cable offers ample reach to accommodate different system configurations without creating excess clutter. Its plug-and-play design ensures a hassle-free setup, helping you get your system up and running in no time.
- Robust Construction: Crafted with a braided cable sleeve and heat-shrink tubing, this power extension/conversion cord offers superior durability and protection. The robust build ensures a secure and stable connection that withstands wear and thermal stress, making it ideal for high-performance computing environments.
Pin numbers depend on the viewpoint. NVIDIA’s workstation guide shows PCIe 6-pin positions 1–3 as +12 V, position 5 as sense, and positions 4 and 6 as ground. Its 8-pin diagram shows positions 1–3 as +12 V, position 4 as Sense1, position 6 as Sense0, and positions 5, 7, and 8 as ground. Consult the guide’s stated viewing side; a cable-plug view and a card-header view can be mirrored. [NVIDIA pinout guide]
Will a 6-pin plug fit an 8-pin GPU socket?
A 6-pin plug may fit a compatible 8-pin card header in the specified orientation, but that does not make it equivalent to an 8-pin supply. The card may detect the 6-pin sense state and limit auxiliary power. An 8-pin plug is keyed to prevent direct insertion into a 6-pin header. Never force a connector; check the graphics card manual for its supported configurations.
Rank #2
- Compatible with EVGA Modular PSU Only Designed for EVGA modular power supplies with PCIe/VGA ports. Not compatible with Corsair or other brands due to different pin configurations. Please verify your PSU model before purchase.
- 8 Pin to 6+2 Pin PCIe GPU Cable Connects an 8 pin PSU PCIe port to a 6+2 pin graphics card connector, supporting GPUs requiring 6-pin or 8-pin PCIe power connections.
- 18AWG Copper Wire for Stable Power Built with 18AWG tinned copper wire to provide reliable power delivery and stable performance for compatible graphics cards.
- 65cm Sleeved Cable for Better Cable Management The 65cm braided sleeved design provides flexible routing inside PC cases while improving appearance and durability.
- Important Safety Check Before Installation Use only with EVGA PCIe/VGA ports. Do not connect to CPU/EPS or motherboard ports. Incorrect cable use may damage your hardware.
Can you use a 6-pin-to-8-pin adapter?
NVIDIA’s support guidance says an adapter could potentially support normal operation only if the PSU’s 6-pin PCIe rails can handle the same current rating as an 8-pin cable, stated there as 150 W. This is conditional advice, not a general recommendation or a guarantee that a particular adapter, PSU, and card combination is safe. [NVIDIA adapter guidance]
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteBefore using an adapter, check the exact GPU and PSU manuals, including documented rail capability and the card maker’s instructions. Prefer a native PCIe lead when the card or PSU manufacturer requires one. Do not infer that a PSU can supply the needed power just because a plug can be made to fit.
Rank #3
- Specific Designed for Corsair, Thermaltake and ARESGAME,not compatible with other Brands of modular power supplies.Power delivery specifications is 18 awg 300V 10A Tinned copper wire,safe and stable. Please check the Model Compatible. Compatible with Corsair Type 3 and Type 4 PSU, Not for EVGA PSU Replacement for your lost or damage cables
- Compatible with Corsair Modular Power Suplly: AX1600i(TITANIUM), AXi, AX(TITANIUM & PLATINUM), HXi, HX(PLATINUM & GOLD), RMi, RMX, RM, SF, CS-M, CX-M, TX-M
- Compatible with Thermaltake Modular PSU: RGB GOLD, RGB PLATINUM, ARGB GOLD, Toughpower TF1 GF1 PF1 GF3 SFX
- Compatible with ARESGAME Modular PSU: AGK750, AGK850, AGT1000, AGS750, AGS850
- NOTE: Not compatible with CORSAIR PSU: AX1200, AX(GOLD), HX(BRONZE & WHITE). Not compatible with other brands of modular power supplies
Do not confuse PCIe GPU power with CPU/EPS power
An 8-pin CPU/EPS connector and an 8-pin PCIe GPU connector have different wiring and are not interchangeable. AMD’s Alveo UL3422 Installation Guide states: “This 8-pin connector is not compatible with an ATX12V/EPS12V power cable source.” Use a cable labeled PCIe or VGA that is approved for your exact PSU model; do not substitute a CPU/EPS lead. [AMD installation guide]
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to check compatibility with your graphics card and PSU
- Read the GPU manual. Confirm the required connector type and number, and any card-specific power instructions. The connector’s conventional allowance does not establish the card’s total power requirement.
- Identify the exact PSU model. Use its manual or manufacturer documentation to check output, rail capability, and which native PCIe cables are supplied or supported. Plug shape alone does not establish capacity.
- Check the cable itself. Use a native PSU PCIe/VGA lead or, if a replacement is needed, a cable the PSU maker lists for that exact model. Modular PSU cables are not universally compatible.
- Compare the documented requirements. Verify that the PSU’s available PCIe leads and documented power capability meet the GPU maker’s instructions. If they do not, do not assume an adapter resolves the mismatch.
NVIDIA’s workstation guidance illustrates why model-specific instructions matter: it gives a typical PCIe 8-pin rating of 150 W, but describes a particular 250 W workstation-card scenario that permits up to 175 W through a single 8-pin only when the PSU provides at least 18 A of dedicated current. That exception applies to the cited scenario; it should not be generalized to other cards or PSUs. [NVIDIA workstation power guidance]
Quick Recap
Best Value
- Adapts a single 8-pin PCIe power connection to dual 8-pin (6+2) slots, compatible with GPUs requiring multiple connectors
- Durable, high-performance design provides additional power to GPUs with a single 8-pin PSU connection
- Ideal for custom PC builds, offering a sleek look that keeps your setup clean and organized
- Efficiently splits one 8-pin connection into two 8-pin (6+2) connectors, ensuring stable power for high-demand GPUs
- Includes two adapters, offering flexibility for multi-connector GPUs or future upgrades, making it a cost-effective choice
Rank #4
- 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
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