For Z820 Workstation Heatsink (No Fan) — Parts 636164-001 / 635868-001

Replacement heatsink specifically for the Z820 workstation. This item is the heatsink only — it does not include a fan. Compatible OEM part numbers: 636164-001 and 635868-001. Designed as a direct replacement to restore proper cooling in compatible Z820 systems. Please confirm your existing part number matches before purchase to ensure fitment.