Lenovo ThinkPad E15 Gen 4 laptop i7-1255U 40GB 1TB Silver

Business laptop with 40GB DDR4

The ThinkPad E15 Gen 4 pairs a 12th Gen Intel Core i7-1255U with 40GB of DDR4 memory and a 1TB PCIe SSD built from two 512GB modules. It runs Windows 11 Pro on a 15.6 inch FHD IPS panel rated at 300 nits with an anti-glare finish. A backlit keyboard and fingerprint reader are included for daily office work.

Sustained load behaviour

The 10-core, 12-thread processor operates at a 1.7GHz base and can reach 4.7GHz max turbo, while Intel Iris Xe graphics share system memory. Under continuous multi-threaded workloads the U-series chip will throttle to stay within its thermal envelope, so expect lower clocks than short bursts. The dual SSD layout helps keep storage throughput steady during long file transfers.

Deciding specification

The single figure that determines fit is the 40GB DDR4 capacity; it cannot be expanded beyond the factory configuration. Buyers who need more memory or discrete graphics for heavy rendering should look elsewhere.

Connectivity and ports

One Thunderbolt 4 port, one USB-A 3.2 Gen 1, one USB 2.0, HDMI 2.0, RJ-45 and a headset jack provide the physical interfaces. Wireless-AX and Bluetooth handle wireless links. The 720p webcam with dual-array microphone covers basic video calls.