Detailed Technical Specifications

Product Information

• Product Name: Lenovo ThinkCentre M900z All-in-One
• Model: ThinkCentre M900z
• Brand: Lenovo
• Series: ThinkCentre (Business All-in-One Series)
• Category: All-in-One Business Desktop
• Release Year: 2016
• Form Factor: All-in-One (AiO)
• Dimensions: With stand: 20.1" x 14.9" x 7.4" (511 x 378 x 188 mm)
• Weight: Starting at 18.5 lbs (8.4 kg)

Processor (CPU)

• Model: Intel Core i5-6500
• Generation: 6th Generation (Skylake) - Note: Often mislabeled as 9th Gen
• Cores/Threads: 4 cores, 4 threads (no Hyper-Threading)
• Base Frequency: 3.2 GHz
• Max Turbo Frequency: 3.6 GHz
• Cache: 6MB Intel Smart Cache
• Socket: BGA (soldered to motherboard)
• TDP: 65W
• Architecture: 14nm
• Intel Technologies: Intel vPro, VT-x, VT-d, SSE4.1/4.2, AVX 2.0

Display

• Size: 21.5-inch or 23.8-inch (depending on configuration)
• Resolution: 1920 x 1080 (Full HD)
• Panel Type: IPS (In-Plane Switching)
• Aspect Ratio: 16:9
• Brightness: 250-300 nits
• Viewing Angles: 178° horizontal/vertical
• Touchscreen: Optional 10-point multi-touch
• Anti-glare: Yes (non-reflective coating)
• Bezel: Thin bezel design

Memory (RAM)

• Capacity: 4GB DDR4 (as configured - minimal for business use)
• Type: DDR4-2133 (non-ECC, unbuffered)
• Slots: 2x SO-DIMM slots (typically 1 slot used in 4GB config)
• Maximum Supported: Up to 32GB (2x16GB)
• Memory Technology: Dual-channel capable (if 2 modules installed)
• Speed: 2133MHz
• Accessibility: User-upgradeable via rear panel access

Storage

• Primary Storage: 500GB 7200RPM SATA HDD
• Interface: SATA 6Gb/s
• Form Factor: 2.5-inch
• Storage Bays:
  • 1x 2.5-inch internal bay (occupied by HDD)
  • Optional M.2 slot for SSD (PCIe NVMe or SATA, depending on configuration)
• Optical Drive: Optional SATA DVD-RW (slim type, tray-load)
• Storage Expansion: Can support dual storage (SSD + HDD) in some configurations

Graphics

• Integrated Graphics: Intel HD Graphics 530
• Base Frequency: 350 MHz
• Max Dynamic Frequency: 1.15 GHz
• Execution Units: 24
• Video Memory: Shared system memory (up to 1.7GB)
• Max Resolution: 4096x2304 @ 60Hz (external display via DisplayPort)
• DirectX Support: DirectX 12
• OpenGL Support: OpenGL 4.5
• Display Outputs: Supports external displays via HDMI or DisplayPort

Operating System

• Pre-installed: Windows 10 Pro 64-bit (typically)
• Recovery: Lenovo Recovery Media, Windows Recovery Environment
• Windows Features: BitLocker, Remote Desktop, Group Policy, Domain Join
• Windows 11 Compatibility: Meets requirements with TPM 2.0 and Secure Boot
• Upgrade Path: Eligible for Windows 11 Pro upgrade

Connectivity

• Ethernet: Intel I219-LM Gigabit Ethernet (10/100/1000)
• Wireless: Intel Dual Band Wireless-AC 8260 (802.11ac, 2x2) + Bluetooth 4.2
• Wake-on-LAN: Supported
• Management: Intel Active Management Technology (AMT) 11.0

Ports & Connectors

• Left Side:
  • USB 3.0: 2x (Type-A, 5 Gbps)
  • Audio: 1x headphone/microphone combo jack
  • Card Reader: 4-in-1 media card reader (SD/SDHC/SDXC/MMC)
• Rear Panel:
  • USB 3.0: 2x (Type-A, 5 Gbps)
  • USB 2.0: 2x (Type-A, 480 Mbps)
  • DisplayPort: 1x (version 1.2)
  • HDMI-in: 1x (for connecting external devices like laptops)
  • Audio: Line-out and microphone jacks
  • Ethernet: 1x RJ-45 (Gigabit)
  • Security: Kensington lock slot

Audio

• Speakers: Stereo speakers (2x 3W)
• Audio Codec: Realtek ALC662
• Microphone: Dual array digital microphones
• Audio Features: Dolby Audio Premium, noise cancellation

Camera & Communications

• Webcam: 720p HD camera with privacy shutter
• Microphone: Dual array digital microphones with noise reduction
• Camera Features: Fixed focus, LED indicator when active

Expansion & Upgradeability

• RAM Slots: 2x SO-DIMM (accessible via rear panel)
• Storage: 2.5-inch drive bay + optional M.2 slot
• Wireless Cards: Replaceable M.2 wireless card
• Serviceability: Tool-less access to RAM and storage compartments

Power Supply

• Type: External power adapter
• Wattage: 135W or 170W (depending on configuration)
• Input Voltage: 100-240V AC, 50-60Hz
• Power Cord: Included (region specific)

Security Features

• TPM: TPM 2.0 embedded security chip
• Chassis Lock: Kensington lock slot
• BIOS Security: Password protection, secure boot, BIOS recovery
• Lenovo Security Features: Lenovo ThinkShield, Self-Healing BIOS
• Camera Privacy: Physical shutter for webcam

Software & Management

• Pre-installed Software: Lenovo Companion, Lenovo Settings, Lenovo Solution Center
• Management: Lenovo Client Center, Intel vPro (on select configurations)
• Remote Management: Compatible with Lenovo XClarity Administrator

Stand & Ergonomics

• Stand Type: Adjustable tilt stand
• Tilt Range: -5° to 30°
• Height Adjustment: No (fixed height)
• Swivel: No
• VESA Mount: Optional (100x100 mm, requires adapter removal)

Environmental Specifications

• Operating Temperature: 50°F to 95°F (10°C to 35°C)
• Storage Temperature: -40°F to 140°F (-40°C to 60°C)
• Relative Humidity: 20% to 80% (non-condensing)
• Altitude: Up to 10,000 feet (3,048 meters)
• Acoustic Noise: 30 dBA typical (idle)

Warranty & Support

• Standard Warranty: 3-year onsite warranty (parts and labor)
• Support Hours: Next business day onsite service
• Extended Warranty: Available up to 5 years

Certifications & Compliance

• ENERGY STAR 8.0 certified
• EPEAT Silver (depending on configuration)
• RoHS compliant
• WEEE compliant
• FCC Class B certified
• CE Marking

What's in the Box

• Lenovo ThinkCentre M900z All-in-One
• Power Adapter and Cord
• Wireless Keyboard and Mouse (Lenovo Preferred Pro or Basic)
• Documentation Kit
• Warranty Card

Performance & Usage Recommendations

• Target Use: General office productivity, business applications, reception desks, call centers
• Recommended Upgrades:
  • RAM: Upgrade to at least 8GB for Windows 10/11 comfortable operation
  • Storage: Add SSD for significantly better performance
• Not Recommended For: Gaming, video editing, 3D rendering, intensive applications

Important Notes & Limitations

• Processor Generation: The i5-6500 is 6th Generation (2015), not 9th Generation - significant performance difference
• RAM: 4GB is minimal for Windows 10/11 - consider immediate upgrade to 8GB minimum
• Storage: HDD will be slow for boot and applications - SSD upgrade recommended
• Graphics: Integrated graphics only - not suitable for graphics-intensive tasks
• Upgradeability: Limited compared to tower desktops - only RAM and storage are easily upgradeable
• Age: Released in 2016 - consider performance for modern applications
• Display: Non-touch unless specifically configured with touchscreen
• All-in-One Limitations: If display fails, entire unit may need service
• Windows 11: Compatible but performance may be suboptimal with only 4GB RAM