| Processor | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Processor model | i7-7700HQ | i5-6200U |
| Processor series | Intel Core i7-7700 Mobile Series | Intel Core i5-6200 series |
| Processor threads | 8 | 4 |
| Processor socket | | LGA 1356 (Socket B2) |
| Processor cores | 4 | 2 |
| Processor codename | Kaby Lake | Skylake |
| Processor family | 7th gen Intel Core i7 | 6th gen Intel Core i5 |
| Processor frequency | 2.8 GHz | 2.3 GHz |
| Motherboard chipset | Intel CM238 | |
| Processor boost frequency | 3.8 GHz | 2.8 GHz |
| Processor cache | 6 MB | 3 MB |
| Thermal Design Power (TDP) | 45 W | 15 W |
| Software | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Operating system installed | No | Windows 10 Pro |
| Operating system architecture | | 64-bit |
| Display & Graphics | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Aspect ratio | 16:9 | 16:9 |
| Contrast ratio | 1000:1 | |
| Panel type | | IPS |
| Display brightness | 300 cd/m? | |
| Display diagonal | 15.6 inch | 15.6 inch |
| Display resolution | 3840 x 2160 pixels | 1920 x 1080 pixels |
| Display surface | Matt | |
| HD type | 4K Ultra HD | Full HD |
| LED backlight | Yes | Yes |
| Touchscreen | No | No |
| Discrete graphics adapter | Yes | No |
| Discrete graphics adapter memory | 4 GB | |
| Discrete graphics adapter model | NVIDIA Quadro M1200M | Not available |
| Maximum on-board graphics adapter memory | 64 GB | 1.74 GB |
| Number of displays supported | 3 | 3 |
| On-board graphics adapter | Yes | Yes |
| On-board graphics adapter base frequency | 350 MHz | 300 MHz |
| On-board graphics adapter family | | Intel HD Graphics |
| On-board graphics adapter DirectX version | 12.0 | |
| On-board graphics adapter dynamic frequency (max) | 1100 MHz | 1000 MHz |
| On-board graphics adapter model | Intel HD Graphics 630 | Intel HD Graphics 520 |
| On-board graphics adapter OpenGL | 4.4 | 4.4 |
| Memory | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Internal memory | 16 GB | 8 GB |
| Maximum internal memory | 64 GB | 16 GB |
| Memory clock speed | 2400 MHz | 1600 MHz |
| Memory layout (slots x size) | 1 x 8 GB | 1 x 8 GB |
| Memory form factor | SO-DIMM | |
| Memory slots | 4x SO-DIMM | 2x SO-DIMM |
| Internal memory type | DDR4-SDRAM | DDR3L-SDRAM |
| Storage | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| HDD capacity | 1000 GB | |
| SSD capacity | 256 GB | 256 GB |
| HDD interface | SATA III | |
| SSD interface | PCI Express | |
| SSD form factor | M.2 | |
| HDD size | 2.5" | |
| Storage media | HDD SSD | SSD |
| Number of SSDs installed | 1 | 1 |
| Number of HDDs installed | 1 | |
| Total storage capacity | 1512 GB | 256 GB |
| Optical drive type | No | DVD Super Multi DL |
| Card reader integrated | Yes | Yes |
| Compatible memory cards | MMC, SD, SDHC, SDXC | MMC, SD, SDHC, SDXC |
| Network & Communication | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| 3G | | No |
| 4G | | No |
| Bluetooth | Yes | Yes |
| Bluetooth version | 4.1 | 4.1 |
| Ethernet LAN | Yes | Yes |
| Wi-Fi | Yes | Yes |
| Wi-Fi standards | IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n | IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n |
| Interfaces/Ports | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Headphone outputs | | 1 |
| VGA (D-Sub) ports | | 1 |
| HDMI version | 1.4b | |
| Microphone in | | Yes |
| HDMI ports quantity | 1 | 1 |
| Combo headphone/mic port | Yes | Yes |
| DC-in jack | Yes | Yes |
| Docking connector | Yes | Yes |
| Ethernet LAN (RJ-45) ports | 1 | 1 |
| ExpressCard slot | Yes | |
| Mini DisplayPorts quantity | 1 | |
| Thunderbolt 3 ports quantity | 1 | |
| USB 3.0 (3.1 Gen 1) Type-A | 4 | 4 |
| USB Sleep-and-Charge | 1 | 1 |
| Input Devices | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Keyboard backlit | | Yes |
| Keyboard number of keys | | 102 |
| Numeric keypad | Yes | Yes |
| Pointing device | ThinkPad UltraNav | Clickpad |
| Spill resistant keyboard | Yes | |
| Windows keys | Yes | Yes |
| Audio | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Audio system | | DTS Studio Sound |
| Audio chip | Realtek ALC3268 | |
| Built-in microphone | Yes | Yes |
| Number of speakers | 2 | |
| Speaker power | 2 W | |
| Built-in Devices | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Front camera | Yes | Yes |
| Front camera resolution | 1280 x 720 pixels | |
| Front camera signal format | 720p | |
| Power | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| AC adapter output current | | 2.37 A |
| AC adapter output voltage | | 19 V |
| AC adapter frequency | 50/60 Hz | |
| AC adapter input voltage | 100 - 240 V | 100 - 240 V |
| AC adapter power | 170 W | |
| Security | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Cable lock slot type | | Kensington |
| Fingerprint reader | | Yes |
| Cable lock slot | Yes | Yes |
| Password protection | Yes | |
| Trusted Platform Module (TPM) | Yes | |
| Design | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Height | | 23.2 mm |
| Brand | Lenovo | Toshiba |
| Family | ThinkPad | Tecra |
| Series | P | |
| Model name | P51 | Z50-C-143 |
| Part Number | 20HJS27B00 | PT571E-06H03QEN |
| Product type | Mobile workstation | Notebook |
| Form factor | Clamshell | Clamshell |
| Colour of product | Black | Metallic |
| Housing material | Aluminium, Glass fiber, Magnesium | |
| Depth | 252.3 mm | 258 mm |
| Width | 377.4 mm | 379 mm |
| Height (rear) | 2.94 cm | |
| Height (front) | 2.45 cm | |
| Weight | 2.67 kg | 2.2 kg |
| Release Date | 2017-09-06 | 2018-01-10 |
| Battery Information | Lenovo ThinkPad P51 20HJS27B00 | Toshiba Tecra Z50-C-143 PT571E-06H03QEN |
| Battery life | | 8 h |
| Battery type | Lithium Polymer (LiPo) | Lithium-Ion (Li-Ion) |
| Number of battery cells | 6 | 4 |
