| Attribute |
Lenovo ThinkPad P51 (20HJS0EF0A) × | 
DELL Precision M3520 (5F07J) × |
| General | | |
| Model | Lenovo ThinkPad P51 | DELL Precision M3520 |
| Product code | 20HJS0EF0A | 5F07J |
| Design | | |
| Form factor | Clamshell | Clamshell |
| Brand | Lenovo | DELL |
| Family | ThinkPad | Precision |
| Series | P | - |
| Model name | P51 | M3520 |
| Part number | 20HJS0EF0A | 5F07J |
| Market positioning | High performance | - |
| Release year (year) | 2017 | 2017 |
| Processor | | |
| Processor family | 7th gen Intel Core i7 | 7th gen Intel Core i7 |
| Processor frequency (GHz) | 2.9 | 2.9 |
| Processor boost frequency (GHz) | 3.9 | 3.9 |
| Processor model | i7-7820HQ | i7-7820HQ |
| Processor cores | 4 | 4 |
| Processor threads | 8 | 8 |
| Processor lithography (Nm) | 14 | 14 |
| Processor socket | - | FCBGA1440 |
| Processor cache (MB) | 8 | 8 |
| Memory | | |
| Internal memory type | DDR4-SDRAM | DDR4-SDRAM |
| Maximum internal memory (GB) | 64 | 32 |
| Memory clock speed (MHz) | 2,400 | 2,400 |
| Internal memory (GB) | 16 | 16 |
| Display | | |
| Display diagonal (inch) | 15.6 | 15.6 |
| Panel type | IPS | IPS |
| HD type | - | Full HD |
| LED backlight | + | + |
| Touchscreen | - | - |
| Display resolution | 1920 x 1080 pixels | 1920 x 1080 pixels |
| Graphics | | |
| On-board graphics adapter | + | + |
| Discrete graphics adapter model | NVIDIA Quadro M1200M | NVIDIA Quadro M620 |
| Discrete graphics memory type | - | GDDR5 |
| Discrete graphics adapter | + | + |
| Discrete graphics adapter memory (GB) | - | 2 |
| On-board graphics adapter base frequency (MHz) | 350 | 350 |
| Maximum on-board graphics adapter memory (GB) | 64 | 64 |
| On-board graphics adapter model | Intel HD Graphics 630 | Intel HD Graphics 630 |
| Storage | | |
| Total storage capacity (GB) | 512 | 512 |
| Number of SSDs installed | - | 1 |
| Card reader integrated | + | + |
| SSD form factor | - | M.2 |
| Storage media | SSD | SSD |
| Optical drive | - | - |
| Networking | | |
| 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
|
| Bluetooth | + | + |
| Ethernet LAN | + | + |
| Ethernet LAN data rates (Mbit/s) | | |
| Wi-Fi | + | + |
| 4g | - | - |
| 3g | - | - |
| Bluetooth version | - | 4.2 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 4 | 3 |
| USB 3.x Type-C ports | 1 | - |
| Combo headphone/mic port | + | + |
| Docking connector | + | - |
| USB Sleep-and-Charge | + | + |
| DVI port | - | - |
| USB Type-C thunderbolt 3 ports | - | 1 |
| HDMI ports quantity | 1 | 1 |
| Ethernet LAN (RJ-45) ports | 1 | 1 |
| Audio | | |
| Speaker power (W) | 2 | 2 |
| Audio chip | Realtek ALC3268 | Realtek ALC3246 |
| Built-in microphone | + | + |
| Camera | | |
| Front camera | + | + |
| Front camera resolution (numeric) (MPixel) | - | 0.9 |
| Front camera resolution (pixels) | 1280 x 720 | 1280 x 720 |
| Keyboard | | |
| Numeric keypad | + | + |
| Keyboard backlit | - | + |
| Full-size keyboard | + | + |
| Pointing device | ThinkPad UltraNav | Touchpad |
| Software | | |
| Operating system installed | Windows 10 Pro | Windows 10 Pro |
| Operating system architecture (bit) | 64 | 64 |
| Weight and dimensions | | |
| Weight (kg) | 2.67 | 2.18 |
| Height (mm) | - | 24.3 |
| Depth (mm) | 252.3 | 251 |
| Width (mm) | 377.4 | 376 |
| Power | | |
| AC adapter power (W) | 170 | 130 |
| Security | | |
| Cable lock slot | + | + |
| Fingerprint reader | + | - |
| Trusted platform module (TPM) | + | - |