---
manufacturer: Lenovo
model: ThinkSystem SR645
slug: lenovo-thinksystem-sr645
part_number: 7D2X
u_height: 1
is_full_depth: true
airflow: front-to-rear
front_image: true
rear_image: true
comments: '[Lenovo ThinkSystem SR650 product guide](https://lenovopress.lenovo.com/lp1280.pdf)'
weight: 20.2
weight_unit: kg
interfaces:
  - name: XCC
    type: 1000base-t
    mgmt_only: true
module-bays:
  - name: PSU 1
    position: PSU1
  - name: PSU 2
    position: PSU2
  - name: OCP3
    position: OCP3
  - name: PCIe1
    position: Slot1
  - name: PCIe2
    position: Slot2
  - name: PCIe3
    position: Slot3