In depth comparison and review of Lenovo ThinkPad P51 (20HJ) and HP Zbook 15 G3. 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 HP Zbook 15 G3 based on its technical characteristics, features, user experience, expert reviews and price level.
robust build quality
powerful processor performance
expandable memory options
high-resolution display
good connectivity options
heavier than competitors
expensive base model
average battery life
noisy under load
| DESIGN AND DIMENSIONS | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Product Type | Mobile workstation | Mobile workstation |
|---|---|---|
| Dimensions (WxDxH) | 37.74 cm x 25.23 cm x 2.94 cm | 38.6 cm x 26.4 cm x 2.6 cm |
| Weight | 2.55 kg | 2.59 kg |
| Case Material | Glass-fibre reinforced plastic, magnesium-aluminum alloy | - |
| Colour | Black | - |
| DISPLAY | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Screen Size (Type) | 15.6" - IPS | 15.6" |
|---|---|---|
| LCD Backlight Technology | LED backlight | LED backlight |
| Screen Resolution | 1920 x 1080 (Full HD) | 1920 x 1080 (Full HD) |
| Widescreen | Yes | Yes |
| Image Aspect Ratio | 16:9 | 16:9 |
| Image Brightness | 250 cd/m² | 300 cd/m² |
| Features | Anti-glare | - |
| PROCESSOR | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| CPU | Intel Core i7 (7th Gen) 7820HQ / 2.9 GHz | Intel Core i7 (6th Gen) 6820HQ / 2.7 GHz |
|---|---|---|
| Max Turbo Speed | 3.9 GHz | - |
| Number of Cores | Quad-Core | Quad-Core |
| Cache | 8 MB | 8 MB |
| 64-bit Computing | Yes | Yes |
| Chipset | Mobile Intel CM238 | - |
| Features | Integrated memory controller | Hyper-Threading Technology, Intel Turbo Boost Technology 2.0, Intel Smart Cache |
| MEMORY | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| RAM | 8 GB (1 x 8 GB) | 16 GB |
|---|---|---|
| Max RAM Supported | 64 GB | 64 GB |
| RAM Type | DDR4 SDRAM - non-ECC | DDR4 SDRAM |
| Speed | 2400 MHz | - |
| Rated Speed | 2400 MHz | - |
| Form Factor | SO-DIMM 260-pin | SO-DIMM 260-pin |
| Slots Qty | 4 | 4 |
| Empty Slots | 3 | - |
| STORAGE | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Main Storage Size (HDD/SSD) | 500 GB HDD SATA 6Gb/s / 7200 rpm | 240 GB SSD |
|---|
| AUDIO & VIDEO | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| 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 Quadro M2000M / Intel HD Graphics 530 |
| Video Memory | 4 GB | 4 GB GDDR5 SDRAM |
| Video System Features | - | NVIDIA Optimus, Shader Model 5.0 |
| Camera | Yes - 720p | Yes - 720p |
| Sound | Stereo speakers, dual array microphone | Stereo speakers, dual array microphone |
| Codec | Realtek ALC3268 | CX7501 |
| Compliant Standards | High Definition Audio | High Definition Audio |
| Audio Features | - | Bang & Olufsen Audio |
| COMMUNICATIONS | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Wireless | 802.11a/b/g/n/ac, Bluetooth 4.1 | Bluetooth, Wi-Fi |
|---|---|---|
| Wireless Controller | Intel Dual Band Wireless-AC 8265 - M.2 Card | - |
| Network Interface | Gigabit Ethernet | Gigabit Ethernet |
| BATTERY | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Technology | 4-cell Lithium Ion | Lithium Ion |
|---|---|---|
| Battery Capacity (Size) | 66 Wh | - |
| Battery Life | Up to 6.5 hours | - |
| AC ADAPTER | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Input | AC 120/230 V (50/60 Hz) | AC 120/230 V (50/60 Hz) |
|---|---|---|
| Output | 170 Watt, 20 V | 150 Watt, 19.5 V |
| INPUT | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Type | Keyboard, TrackPoint, UltraNav | Keyboard, touchpad, pointing stick |
|---|---|---|
| Numeric Keypad | Yes | - |
| Features | Spill-resistant, multi-touch touchpad | Volume control, spill-resistant, touchpad with gesture support |
| CONNECTIONS & EXPANSIONS | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| 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 |
LAN VGA USB 3.0 (charging) HDMI 2 x USB-C 3.1 Gen 2 (supports Thunderbolt 3, DisplayPort Alt Mode) Headphone/microphone combo jack 2 x USB 3.0 Dock |
| Memory Card Reader | 4 in 1 (SD Card, MultiMediaCard, SDHC Card, SDXC Card, SDXC UHS-II Card) | Yes (SD Card, SDHC Card, SDXC Card, SDXC UHS-II Card) |
| SOFTWARE | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Operating System (OS) | Windows 10 Pro 64-bit Edition | Windows 10 Pro 64-bit Edition |
|---|
| MISCELLANEOUS | Lenovo ThinkPad P51 (20HJ) | HP Zbook 15 G3 |
|---|
| Dockable | Yes | Yes |
|---|---|---|
| Included Accessories | Power adapter | Power adapter |
| Security | Trusted Platform Module (TPM 2.0) Security Chip, fingerprint reader | Trusted Platform Module (TPM 1.2) Security Chip |
| 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, hard drive password, power-on password |
| Compliant Standards | RoHS | ISO 9001, ISO 14001, RoHS, ISO 27001 |
| ENERGY STAR Certified | Yes | Yes |
| Manufacturer Warranty | - | Limited warranty - 2 years - pick-up and return |
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