{
  "slug": "nvme-composite-temperature",
  "term": "NVMe Composite Temperature",
  "aliases": [
    "Composite Temperature",
    "NVMe CTEMP"
  ],
  "definition": "NVMe Composite Temperature is an implementation-specific temperature value in kelvins representing the controller and its associated namespaces in the SMART / Health Information log.",
  "note": "Base 2.3 Figure 210 places the field at bytes 1-2 and does not require its value to match any physical point in the NVM subsystem. Separate Temperature Sensor 1-8 fields are distinct telemetry. WCTEMP and CCTEMP in Identify Controller specify warning and critical overheating composite thresholds. [nvme-base-2-3-smart]",
  "status": "shipping",
  "advantages": [],
  "limitations": [
    {
      "text": "A monitoring label such as NAND temperature or controller-die temperature requires device-specific evidence; the composite field alone does not establish either interpretation.",
      "citationIds": [
        "nvme-base-2-3-smart"
      ]
    }
  ],
  "related": [
    "nvme-smart-log"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "citations": [
    {
      "id": "nvme-base-2-3-smart",
      "title": "NVM Express Base Specification 2.3, Figure 210, printed pp. 214, 216-217",
      "url": "https://nvmexpress.org/wp-content/uploads/NVM-Express-Base-Specification-Revision-2.3-2025.08.01-Ratified.pdf",
      "accessed": "2026-10-14"
    }
  ],
  "updated": "2026-10-14"
}