Selling an open-box Corsair Vengeance DDR5 128GB kit, model CMK128GX5M2B6400C42.

This memory kit was opened only to validate operation, run MemTest86, and photograph the modules. It has not been used for daily work, gaming, mining, or long-term workloads. Use has been limited to validation and testing.

Per Corsair specs, this kit features DDR5-6400 speed (PC5-51200), 128GB capacity (2 x 64GB modules), CL42, 1.35V tested voltage, 288-pin UDIMM form factor, and Intel XMP 3.0 support. The modules use black aluminum heatspreaders. The kit's XMP profile shown in the validation screenshots specifies 42-52-52-104 timings at 6400 MT/s.

Condition

Functional: Tested and verified working at 6400 MT/s with 42-52-52-104 timings on an Intel Core Ultra 9 285K / ASUS ROG Maximus Z890 Hero system. The attached MemTest86 V11.7 report dated October 23, 2026 shows PASS: 52/52 tests passed, zero errors, with each listed test completing 4/4 passes. Total test time was 16 hours, 16 minutes, 33 seconds. CPU-Z, HWiNFO, and Windows Task Manager screenshots also show the full 128GB recognized and running at 6400 MT/s.

Cosmetic: Open-box condition. Opened only for validation, MemTest86, and photographs. Please review all listing photos for the exact physical condition of the modules and packaging.

Included

• Corsair Vengeance 128GB (2 x 64GB) DDR5-6400 CL42 memory kit
• Original retail packaging (opened for validation testing and photography)

Compatibility / Technical Notes

This kit ships with Intel XMP 3.0 profiles. Corsair lists compatibility with Intel 700-series and 800-series platforms. For best results, enable the XMP profile in BIOS to reach the rated overclock speed. Maximum memory speed and system stability depend on the capability of the motherboard and CPU, BIOS version, and memory configuration. The kit's default SPD specification is 4800 MT/s CL40 at 1.1V.

Please confirm your motherboard's qualified vendor list (QVL), BIOS support for 64GB DDR5 UDIMMs, and support for the full 128GB capacity before purchasing. Validation results apply to the Intel system shown in the screenshots.

Buyer Notes

• Sold exactly as pictured and described.
• This listing is for one 128GB kit containing two 64GB modules.
• Please confirm motherboard and CPU memory compatibility before purchasing.
• For fraud prevention and shipment verification, all item serial numbers are recorded and logged prior to shipment.
• Item condition and packaging are photographed/recorded before shipment to help prevent shipping or return disputes.
• Manufacturer warranty coverage is subject to Corsair's warranty terms and verification process.

References

• Corsair product page
• PCPartPicker listing
• Amazon listing

Tags

Corsair, Vengeance, DDR5, DDR5-6400, 128GB RAM, 2x64GB, CL42, CMK128GX5M2B6400C42, Intel XMP 3.0, desktop memory, workstation RAM, gaming RAM, open box, MemTest86