This is a modular PC power supply (PSU) cable — specifically the main 24-pin ATX motherboard power cable. 
Key details from the photos:
• One end: Standard 24-pin ATX female connector (the wide rectangular one with 2 rows of 12 sockets). This plugs into the motherboard’s main power socket.
• Other end: Split into two smaller connectors that plug into the modular ports on a modular/semi-modular PSU. These appear to be an 8-pin (or similar multi-pin with latch) and a 6-pin (2×3) style modular connector. This split design is common so the cable can fit different PSU modular socket layouts.
• All-black wires (flat ribbon-style grouping in places), typical of many aftermarket or OEM modular cables. Wire markings visible in one photo (AWM-style insulation, common for these cables).
What it’s used for
It delivers the main system power (3.3V, 5V, 12V rails + control signals like PS_ON and Power Good) from a modular PSU to the motherboard. It is not an extension cable, GPU/PCIe cable, CPU/EPS cable, or dual-PSU adapter.
Important notes for use or resale
• Modular cables are not universal. The PSU-side connectors and pinouts are brand/model-specific. Using the wrong one (even if it physically fits) can damage the PSU, motherboard, or other components. 
• Best listed/sold as a replacement modular 24-pin ATX cable for matching PSU brands (common ones include various Corsair, Seasonic, EVGA, Cooler Master, etc., but exact match requires checking the PSU’s modular port layout).
• Condition looks good/clean from the photos (no obvious damage, pins intact).
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