In depth comparison and review of Lenovo ThinkPad P51 (20HJ) and Lenovo ThinkPad P16s Gen 1 (21BU). Compare sizes, performance, storage capacities, batteries and other important specifications and features to easily choose the right laptop for you. Our goal is to help you uncover differences between the products and find the laptop that will best fit your needs.
Advantages and disadvantages of Lenovo ThinkPad P16s Gen 1 (21BU) based on its technical characteristics, features, user experience, expert reviews and price level.
robust build quality
excellent keyboard feel
impressive battery life
good thermal management
reliable performance
heavy form factor
modest display brightness
limited GPU power
higher price point
| DESIGN AND DIMENSIONS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Product Type | Mobile workstation | Mobile workstation - 180-degree hinge design |
|---|---|---|
| Dimensions (WxDxH) | 37.74 cm x 25.23 cm x 2.94 cm | 36.19 cm x 25.55 cm x 2.083 cm |
| Weight | 2.55 kg | 1.677 kg |
| Case Material | Glass-fibre reinforced plastic, magnesium-aluminum alloy | Carbon fibre (top), glass-fibre (top), polycarbonate (top), polyphenylene sulfide (bottom) |
| Colour | Black | Black |
| DISPLAY | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Screen Size (Type) | 15.6" - IPS | 16" - IPS |
|---|---|---|
| LCD Backlight Technology | LED backlight | LED backlight |
| Screen Resolution | 1920 x 1080 (Full HD) | 1920 x 1200 (WUXGA) |
| Widescreen | Yes | Yes |
| Image Aspect Ratio | 16:9 | 16:10 |
| Image Brightness | 250 cd/m² | 300 cd/m² |
| Colour Gamut | - | 45% NTSC |
| Features | Anti-glare | Anti-glare, 170° viewing angle, DC dimming |
| PROCESSOR | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| CPU | Intel Core i7 (7th Gen) 7820HQ / 2.9 GHz | Intel Core i7 (12th Gen) 1260P / 2.1 GHz |
|---|---|---|
| Max Turbo Speed | 3.9 GHz | 4.7 GHz |
| Number of Cores | Quad-Core | 12-core |
| Cache | 8 MB | 18 MB |
| 64-bit Computing | Yes | - |
| Chipset | Mobile Intel CM238 | - |
| Features | Integrated memory controller | Integrated memory controller |
| MEMORY | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| RAM | 8 GB (1 x 8 GB) | 32 GB (1 x 16 GB + 16 GB (soldered)) |
|---|---|---|
| Max RAM Supported | 64 GB | 48 GB |
| RAM Type | DDR4 SDRAM - non-ECC | DDR4 SDRAM - non-ECC |
| Speed | 2400 MHz | 3200 MHz |
| Rated Speed | 2400 MHz | 3200 MHz |
| Form Factor | SO-DIMM 260-pin | SO-DIMM 260-pin |
| Slots Qty | 4 | 1 |
| Empty Slots | 3 | 0 |
| STORAGE | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Main Storage Size (HDD/SSD) | 500 GB HDD SATA 6Gb/s / 7200 rpm | 1 TB SSD M.2 2280 PCIe 4.0 x4 - TCG Opal Encryption - Samsung |
|---|
| AUDIO & VIDEO | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Multi-GPU Configuration | 1 single GPU card / integrated GPU | 1 single GPU card / integrated GPU |
|---|---|---|
| Graphics Processor (GPU) | NVIDIA Quadro M1200 / Intel HD Graphics 630 | NVIDIA T550 / Intel Iris Xe Graphics |
| Max Monitors Supported | - | 3 external monitor(s) |
| Video Memory | 4 GB | 4 GB GDDR6 SDRAM |
| Camera | Yes - 720p | Yes - 1080p |
| Camera Features | - | Privacy shutter, IR camera, Windows Hello, fixed focus |
| Sound | Stereo speakers, dual array microphone | Stereo speakers, dual array microphone |
| Codec | Realtek ALC3268 | Realtek ALC3287 |
| Compliant Standards | High Definition Audio | High Definition Audio, Dolby Audio, Dolby Voice |
| COMMUNICATIONS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Wireless | 802.11a/b/g/n/ac, Bluetooth 4.1 | Bluetooth 5.2, 802.11a/b/g/n/ac/ax (Wi-Fi 6E) |
|---|---|---|
| Wireless Controller | Intel Dual Band Wireless-AC 8265 - M.2 Card | Intel Wi-Fi 6E AX 211 |
| Network Interface | Gigabit Ethernet | Gigabit Ethernet |
| BATTERY | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Technology | 4-cell Lithium Ion | 4-cell lithium polymer |
|---|---|---|
| Battery Capacity (Size) | 66 Wh | 86 Wh |
| Battery Life | Up to 6.5 hours | - |
| AC ADAPTER | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Input | AC 120/230 V (50/60 Hz) | AC 100-240 V (50/60 Hz) |
|---|---|---|
| Output | 170 Watt, 20 V | 100 Watt, 5 / 9 / 15 / 20 V |
| INPUT | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Type | Keyboard, TrackPoint, UltraNav | Keyboard, TrackPoint, UltraNav |
|---|---|---|
| Numeric Keypad | Yes | Yes |
| Keyboard Backlight | - | Yes |
| Features | Spill-resistant, multi-touch touchpad | Spill-resistant, multi-touch touchpad, Fn keys with Unified Communications controls |
| CONNECTIONS & EXPANSIONS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Slots | 1 x ExpressCard/34 (1 free) | - |
|---|---|---|
| Interfaces | USB 3.1 Gen 1/USB 3.0 (Always On) 3 x USB 3.1 Gen 1/USB 3.0 USB-C (supports Thunderbolt 3) Mini DisplayPort HDMI LAN Dock Headphone/microphone combo jack |
USB 3.2 Gen 1 (Always On) USB 3.2 Gen 1 2 x USB4 (supports USB-C 3.2 Gen 2, Thunderbolt 4, DisplayPort 1.4 Alt Mode) (Power Delivery 3.0) HDMI Headphone/microphone combo jack LAN |
| Memory Card Reader | 4 in 1 (SD Card, MultiMediaCard, SDHC Card, SDXC Card, SDXC UHS-II Card) | - |
| SOFTWARE | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Operating System (OS) | Windows 10 Pro 64-bit Edition | Windows 10 Pro 64-bit Edition (available through downgrade rights from Windows 11 Pro) + Windows 11 Pro Licence |
|---|
| MISCELLANEOUS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21BU) |
|---|
| Dockable | Yes | - |
|---|---|---|
| Included Accessories | Power adapter | USB-C power adapter |
| Security | Trusted Platform Module (TPM 2.0) Security Chip, fingerprint reader | Discrete Trusted Platform Module (TPM 2.0) Security Chip, fingerprint reader, smart card reader |
| Security Slot Type | Kensington security slot | Kensington security slot |
| Theft/Intrusion Protection | Security lock slot (cable lock sold separately) | Security lock slot (cable lock sold separately) |
| Features | Administrator password, hard drive password, power-on password, ThinkVantage Active Protection System, MIL-STD-810G tested | Administrator password, power-on password, RapidCharge, MIL-STD-810H tested, self-healing BIOS, NVMe password |
| Compliant Standards | RoHS | RoHS, TUV Rheinland Low Blue Light Certification, TCG Certified, TUV Rheinland Eye Comfort Certification |
| ENERGY STAR Certified | Yes | - |
| Max Operating Temperature | - | 35 °C |
| Min Operating Temperature | - | 5 °C |
| Humidity Range Operating | - | 8 - 95% |
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