In depth comparison and review of Lenovo ThinkPad P51 (20HJ) and Lenovo ThinkPad P16s Gen 1 (21CL). 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 (21CL) based on its technical characteristics, features, user experience, expert reviews and price level.
robust build quality
excellent keyboard feel
good battery life
reliable performance
advanced security features
heavy design
limited graphics power
higher price point
noisy under load
| DESIGN AND DIMENSIONS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Product Type | Mobile workstation | Mobile workstation - 180-degree hinge design |
|---|---|---|
| Dimensions (WxDxH) | 37.74 cm x 25.23 cm x 2.94 cm | 36.198 cm x 25.55 cm x 2.05 cm |
| Weight | 2.55 kg | 1.81 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 (21CL) |
|---|
| Screen Size (Type) | 15.6" - IPS | 16" - IPS |
|---|---|---|
| LCD Backlight Technology | LED backlight | - |
| Screen Resolution | 1920 x 1080 (Full HD) | 2560 x 1600 (WQXGA) |
| Widescreen | Yes | Yes |
| Image Aspect Ratio | 16:9 | 16:10 |
| Image Brightness | 250 cd/m² | 400 cd/m² |
| Colour Gamut | - | 100% sRGB |
| Features | Anti-glare | Anti-glare, Eye comfort mode, Low Blue Light technology, 170° viewing angle, X-Rite Pantone factory color calibration, Dolby Vision, DC dimming, 85.4% screen-to-body ratio |
| PROCESSOR | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| CPU | Intel Core i7 (7th Gen) 7820HQ / 2.9 GHz | AMD Ryzen 7 Pro 6850U / 2.7 GHz |
|---|---|---|
| Max Turbo Speed | 3.9 GHz | 4.7 GHz |
| Number of Cores | Quad-Core | 8-core |
| Cache | 8 MB | L3 - 16 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 (21CL) |
|---|
| RAM | 8 GB (1 x 8 GB) | 32 GB (provided memory is soldered) |
|---|---|---|
| Max RAM Supported | 64 GB | - |
| RAM Type | DDR4 SDRAM - non-ECC | LPDDR5 SDRAM |
| Speed | 2400 MHz | 6400 MHz |
| Rated Speed | 2400 MHz | 6400 MHz |
| Form Factor | SO-DIMM 260-pin | - |
| Slots Qty | 4 | - |
| Empty Slots | 3 | - |
| STORAGE | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Main Storage Size (HDD/SSD) | 500 GB HDD SATA 6Gb/s / 7200 rpm | 1.024 TB SSD M.2 2280 PCIe 4.0 x4 - TCG Opal Encryption - Kioxia |
|---|
| AUDIO & VIDEO | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Multi-GPU Configuration | 1 single GPU card / integrated GPU | - |
|---|---|---|
| Graphics Processor (GPU) | NVIDIA Quadro M1200 / Intel HD Graphics 630 | AMD Radeon 680M |
| Max Monitors Supported | - | 3 external monitor(s) |
| Video Memory | 4 GB | - |
| Camera | Yes - 720p | Yes - 1080p |
| Camera Features | - | Privacy shutter, Windows Hello, fixed focus, hybrid FHD/IR camera |
| 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 |
| Audio Features | - | Input: Dolby Voice |
| COMMUNICATIONS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Wireless | 802.11a/b/g/n/ac, Bluetooth 4.1 | Bluetooth 5.1, 802.11a/b/g/n/ac/ax (Wi-Fi 6E) |
|---|---|---|
| Wireless Controller | Intel Dual Band Wireless-AC 8265 - M.2 Card | Qualcomm NFA725A |
| Network Interface | Gigabit Ethernet | Gigabit Ethernet |
| Features | - | Wake-on-LAN (WOL) |
| BATTERY | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Technology | 4-cell Lithium Ion | 4-cell lithium polymer |
|---|---|---|
| Battery Capacity (Size) | 66 Wh | 52.5 Wh |
| Battery Life | Up to 6.5 hours | - |
| AC ADAPTER | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Input | AC 120/230 V (50/60 Hz) | AC 100-240 V (50/60 Hz) |
|---|---|---|
| Output | 170 Watt, 20 V | 65 Watt |
| INPUT | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| 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 (21CL) |
|---|
| 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 USB-C 3.2 Gen 2 (supports DisplayPort 1.4 Alt Mode) (Power Delivery) HDMI (4K support) LAN Headphone/microphone combo jack |
| 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 (21CL) |
|---|
| Operating System (OS) | Windows 10 Pro 64-bit Edition | Windows 11 Pro |
|---|
| MISCELLANEOUS | Lenovo ThinkPad P51 (20HJ) | Lenovo ThinkPad P16s Gen 1 (21CL) |
|---|
| Dockable | Yes | - |
|---|---|---|
| Included Accessories | Power adapter | USB-C slim power adapter |
| Security | Trusted Platform Module (TPM 2.0) Security Chip, fingerprint reader | Discrete Trusted Platform Module (TPM 2.0) Security Chip, fingerprint reader |
| Security Slot Type | Kensington security slot | Kensington nano 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, MIL-STD-810H tested, self-healing BIOS, NVMe password |
| Compliant Standards | RoHS | RoHS, TCG Certified, TCO Certified 9.0 |
| ENERGY STAR Certified | Yes | - |
| Max Operating Temperature | - | 35 °C |
| Min Operating Temperature | - | 5 °C |
| Humidity Range Operating | - | 8 - 95% |
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