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Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365 — main product image
Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365
Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365
Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365
Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365
Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365
Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365
Lenovo

Lenovo 21DJ0016US-4434-26779 ThinkBook 15 i7 Laptop, MS 365

1920x1080i7-1255U24GB DDR465WBluetooth 5.2

24GB RAM, 2TB NVMe SSD, and a 12th-Gen i7 in a sub-4-pound chassis — the ThinkBook 15 punches well above its weight class for professional workloads.

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Overview

The Lenovo ThinkBook 15 Gen 4 is built around Intel's 12th-generation i7-1255U — a 10-core (2P+8E), 12-thread processor with a 1.20 GHz base clock and a 4.7 GHz single-core boost. That base clock looks modest on paper, but the E-core architecture means the CPU never wastes a P-core on background tasks, keeping peak burst performance available when it matters. Paired with 24GB of DDR4 RAM and a 2TB PCIe NVMe SSD, this configuration eliminates the two most common bottlenecks in business laptops: memory pressure during parallel workflows and storage latency on large file operations. The 15.6-inch IPS panel runs at native 1920×1080 — not a 4K panel, but the FHD resolution is the correct choice at this screen size for maximizing battery efficiency without sacrificing sharpness at normal viewing distances.

In practice, this machine is built for knowledge workers who run multiple applications simultaneously — developers with large IDEs and Docker containers, analysts working across Excel, browser, and database tools, or executives who simply refuse to wait on their hardware. The Thunderbolt 4 port means a single cable can connect an external 4K monitor, high-speed storage, and power simultaneously. The fingerprint reader and backlit keyboard address the security and usability basics that enterprise deployments require. It is not a workstation-class system — the Iris Xe graphics are a firm ceiling for GPU-accelerated tasks — but for the CPU-and-storage-bound workflows that define most professional use, it is a well-specified, compact machine at a competitive price point, further sweetened by the included Microsoft 365 Personal year subscription.

Key Features

15.6" Full HD (1920x1080) 60Hz IPS Display; Wi-Fi 6 AX201 Wifi, Bluetooth 5.2, Ethernet LAN (RJ-45), 720p HD Webcam, FP Security, Backlit, .

Intel Core i7-1255U Deca Core 12th Gen Intel Core i7-1255U 1.20GHz Processor (upto 4.7 GHz, 12MB Cache, 10-Core , 12-Threads, 2) ; Intel Iris Xe Graphics, .

24GB DDR4 RAM (8GB Onboard + 16GB SODIMM); 65W Power Supply, 3-Cell 45 WHr Battery; Mineral Grey Color, .

2TB PCIe NVMe SSD; 2 USB 3.2 Gen1, 1 HDMI, Thunderbolt 4 (Type-C), USB 3.2 Type-C Gen2, , Windows 11 Pro-64.,

Includes Microsoft 365 Personal 1 Year Subscription for 1 User

Specifications

Processor
Intel Core i7-1255U, 10-Core (2P+8E), 1.20 GHz base / 4.7 GHz boost, 12MB Cache
Memory
24GB DDR4 (8GB soldered + 16GB SODIMM)
Storage
2TB PCIe NVMe SSD
Graphics
Intel Iris Xe (integrated)
Display
15.6" IPS, 1920×1080, 60Hz
Operating System
Windows 11 Pro (64-bit)
Wireless
Wi-Fi 6 (AX201), Bluetooth 5.2
Ports
2x USB 3.2 Gen1 Type-A, 1x HDMI, 1x Thunderbolt 4 (Type-C), 1x USB 3.2 Gen2 Type-C, SDXC reader, 3.5mm combo jack
Webcam
720p HD
Security
Fingerprint reader
Battery
3-Cell, 45 WHr
Power Adapter
65W
Color
Mineral Grey
Dimensions
14 x 9 x 1 inches
Weight
3 lbs
Included Software
Microsoft 365 Personal (12-month, 1 user, 1TB OneDrive)

Pros & Cons

👍 Pros

  • The i7-1255U boosts to 4.7 GHz on P-cores, delivering strong single-threaded performance for compile jobs and data processing.
  • 2TB PCIe NVMe SSD provides both high capacity and sequential read speeds that eliminate storage as a workflow bottleneck.
  • 24GB DDR4 RAM handles memory-heavy workloads like virtual machines or large datasets without requiring an immediate upgrade.
  • Thunderbolt 4 port supports 40 Gbps peripherals, external displays up to 8K, and pass-through charging — all from one cable.
  • Wi-Fi 6 (AX201) cuts latency and increases throughput on congested networks compared to Wi-Fi 5 adapters in older business laptops.

👎 Cons

  • 8GB of RAM is soldered on-board, capping the single-channel upgrade path and preventing a full dual-channel memory configuration.
  • The 45 WHr battery is small for a 15.6-inch laptop — expect 5–7 hours of real-world mixed use, not the all-day runtime of larger-battery competitors.
  • Intel Iris Xe handles light GPU work but has no dedicated VRAM — sustained rendering, ML inference, or gaming above 1080p will bottleneck here.
  • The 60Hz IPS panel is accurate but won't satisfy users coming from 90Hz or 120Hz displays; motion clarity is noticeably softer during scrolling.
  • The 720p webcam is functional but lags behind competitors offering 1080p at this price point, which matters for video-heavy remote work.

Frequently Asked Questions

The 1255U uses Intel's P-core/E-core design — 2 Performance cores handle heavy single-threaded tasks (up to 4.7 GHz boost), while 8 Efficiency cores manage background processes without taxing the P-cores. In practice, you can run a video export alongside browser tabs and email without perceptible slowdown.
Partially. 8GB is soldered directly to the motherboard and cannot be changed. The remaining 16GB occupies a single SODIMM slot, which can be swapped for a larger module — up to 32GB on that slot — giving you a maximum of 40GB total.
PCIe NVMe drives in this class typically deliver sequential reads of 3,000–3,500 MB/s — roughly 5–6x faster than a SATA SSD at ~550 MB/s. Boot times drop under 10 seconds, and large file transfers that would take minutes on older storage complete in seconds.
Yes. Thunderbolt 4 provides 40 Gbps bandwidth and supports external GPU enclosures, dual 4K displays, or a single 8K display. It also handles 100W power delivery, so you can charge the ThinkBook through the same port.
It provides 12 months of access to Word, Excel, PowerPoint, OneNote, and Outlook (full desktop apps, not web-only), plus 1TB of OneDrive cloud storage. After the year, it converts to a paid subscription unless cancelled.

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