Lenovo ThinkCentre M820z AIO

21.5-inch business all-in-one on the Intel B360 chipset, offered from 8th-gen Celeron/Pentium through 9th-gen Core i9-9900, with up to 32 GB DDR4 SO-DIMM, one 2.5" bay plus an M.2 SSD slot, and an optional 10-point touch panel on a tilt/swivel stand.

Memory

Slots: Two DDR4 SO-DIMM slots, dual-channel capable
Type: DDR4-2400 (Celeron/Pentium/Core i3) or DDR4-2666 (Core i5/i7/i9) SO-DIMM, non-ECC
Max: 32 GB (2 × 16 GB), based on Lenovo's tested memory

Storage

Support: Up to two drives: 1 × 2.5" HDD/SSD + 1 × M.2 SSD; 2.5" HDD up to 1 TB, M.2 SSD up to 1 TB; optional Intel Optane Memory M10, M.2
Bays: 1 × 2.5" SATA 6 Gb/s bay (HDD 5.4K/7.2K rpm, or SATA SSD, plain or Opal)
M.2: 1 × M.2 slot: M.2 2242 PCIe 3.0 x2 or M.2 2280 PCIe 3.0 x4 NVMe SSD
RAID: Not supported
Optical: Slim 9.0 mm DVD-ROM or DVD±RW, or none
Card reader: Optional 3-in-1 card reader

Graphics

Integrated: Intel UHD Graphics 610 (Celeron/Pentium) or 630 (Core i3 and up)
Discrete: None offered
Outputs: 1 × DisplayPort
Max resolution: 4096×2304 @ 60 Hz (DP)
Monitors: Up to 2 independent displays: native panel + 1 external via DisplayPort

Expansion

M.2: Two M.2 slots: one for WLAN, one for the SSD/Optane Memory module

Networking

Onboard: Gigabit Ethernet, Realtek RTL8111G, 1 × RJ-45, Wake-on-LAN
WLAN: Optional Realtek RTL8821CE (1×1 ac + BT4.2), Realtek RTL8822BE (2×2 ac + BT4.2), Intel Dual Band Wireless-AC 3165 (1×1 + BT4.2) or Intel Dual Band Wireless-AC 8265 (2×2 + BT4.2), M.2 card

Power

Adapter: 150 W external adapter, 90% efficiency

Ports

Rear: 4 × USB 3.1 Gen 1 (one supports Smart Power On), 1 × DisplayPort, 1 × Ethernet (RJ-45)
Rear optional: 1 × serial
Right: 1 × USB 3.1 Gen 2 (Always On, fast charge), 1 × USB-C 3.1 Gen 1, 1 × headphone / microphone combo jack (3.5 mm)
Right optional: 1 × card reader

Display

Panel: 21.5" FHD (1920×1080) IPS, anti-glare, 250 nits, 1000:1 contrast, 16:9, ±89° viewing angles
Touch: Optional 10-point Advanced In-cell Touch (AIT), or non-touch
Features: Borderless design, low blue light mode

Physical

Form factor: AIO, 21.5"
Dimensions (W×D×H): Full function monitor stand, no camera: 491 × 252 × 377–486 mm; UltraFlex III stand, no camera: 491 × 252 × 335–417 mm; without stand, with camera: 491 × 49 × 321 mm
Weight: Without stand: 5.05 kg (non-touch) / 5.25 kg (touch); with full function stand: 7.18 / 7.38 kg; with UltraFlex III stand: 7.65 / 7.85 kg (PSREF, camera adds 22 mm height)
Colour: Black
Bays: 1 × 2.5" disk bay, 1 × slim ODD bay
Stand: Full function monitor stand (-5° to +45° tilt, 45° swivel, up to 110 mm lift) or UltraFlex III stand (-5° to +70° tilt, 45° swivel, up to 136 mm lift flat / 82 mm vertical), or no stand
Mounting: Supports VESA mount 100 mm
Security: Discrete TPM 2.0 (TCG certified); Kensington Security Slot; optional chassis intrusion switch
Audio: High Definition Audio, Realtek ALC233 codec; stereo speakers 2 W × 2; dual-array microphone
Camera: Optional 1080p webcam, LED indicator, physical on/off switch, multi-degree rotation (horizontal 0–180°, vertical -25° to 25°)
Rugged: MIL-STD-810G tests passed

Management

BIOS security: Administrator, power-on and hard disk passwords; boot sequence control; boot without keyboard/mouse; Smart USB protection; individual USB port disable
System management: None (no vPro/AMT offered)
Status: End of support 2025-02-24 (PSREF)

Operating systems

Preloads: Windows 10 Home 64, Windows 10 Pro 64, Ubuntu Linux, no operating system

Processors

Intel Celeron G4900
Intel Celeron G4920
Intel Celeron G4930
Intel Celeron G4950
Intel Pentium Gold G5400
Intel Pentium Gold G5420
Intel Pentium Gold G5500
Intel Pentium Gold G5600
Intel Pentium Gold G5620
Intel Core i3-8100
Intel Core i3-8300
Intel Core i3-9100
Intel Core i3-9300
Intel Core i5-8400
Intel Core i5-8500
Intel Core i5-8600
Intel Core i5-9400
Intel Core i5-9500
Intel Core i5-9600
Intel Core i7-8700
Intel Core i7-9700
Intel Core i9-9900