Power cable adapter Thermalright TG-WV-P38H1R 1×12VHPWR to 3×8‑pin PCIe (reverse wiring)

Thermalright TG-WV-P38H1R is a power cable adapter that converts one 12VHPWR connector into three 8‑pin PCIe connectors using reverse wiring. Designed for GPU power delivery, the adapter allows systems with existing 8‑pin PCIe power cables to connect to graphics cards that use the newer single 12VHPWR plug. The compact cable assembly preserves pin mapping required for reverse-wired configurations and supports practical reuse of power supply cabling when upgrading or replacing a graphics card.

Advantages

The adapter provides a straightforward way to bridge legacy 8‑pin PCIe cabling with modern 12VHPWR GPU inputs without modifying the power supply. Reverse wiring ensures compatible pin assignment for specific GPU designs and helps avoid custom splicing or purchasing new modular cables. The compact design reduces cable clutter inside the chassis while enabling distribution of current across three 8‑pin connectors for stable GPU power delivery.

Suitable for

• Systems where an existing PSU has multiple 8‑pin PCIe cables but the GPU requires a 12VHPWR connector
• Upgrades to a new graphics card while reusing compatible PSU cabling
• Building or testing rigs that need flexible GPU power routing without replacing the PSU

Key specifications

• Input: 1 × 12VHPWR (female) to 3 × 8‑pin PCIe (male) via reverse wiring
• Purpose: GPU power adapter for 12VHPWR to multiple 8‑pin PCIe connections
• Cable arrangement: compact multi-branch assembly intended for internal PC use
• Compatibility: designed for systems using standard 8‑pin PCIe power cables and GPUs with 12VHPWR sockets
• Connector orientation: reverse-wired pin mapping to match specified GPU power pinout

How to use

Power off the system and disconnect it from mains power prior to installation. Insert the adapter’s 12VHPWR plug into the GPU’s 12VHPWR socket, then connect up to three 8‑pin PCIe power cables from the PSU to the adapter’s PCIe outputs. Ensure each 8‑pin cable is fully seated and that cable routing does not place strain on connectors. After all connections are secure, reconnect mains power and power on the system. Verify stable operation and monitor GPU power draw during initial use.

Usage recommendations

Use the adapter only with power supplies and cables that meet the required current and safety specifications for your GPU. Distribute the GPU’s power across all three 8‑pin cables to reduce load on individual wires. Do not use the adapter if any connector or cable shows damage, and consult the GPU and PSU documentation to confirm compatibility with reverse-wired adapters.