Lenovo ThinkPad E15 Gen 4 15.6" FHD i7-1255U 40GB 1TB business laptop 21E6007GUS

Product identity and audience

The Lenovo ThinkPad E15 Gen 4 is a 15.6-inch business laptop with a 12th Generation Intel Core i7-1255U processor, 40GB DDR4 3200MHz memory and a 1TB PCIe NVMe SSD. It targets professionals who need a portable Windows 11 Pro machine for office applications, video calls and light content creation. Buyers who want more storage or a discrete graphics card for heavy 3D work should look elsewhere.

Interface limits and practical constraints

The single Thunderbolt 4 port delivers 40Gbps bandwidth, Power Delivery 3.0 and DisplayPort 1.4, allowing two external 4K displays at 60Hz alongside the internal panel. HDMI 2.0 adds a third video output. Wi-Fi 6E AX211 and Bluetooth 5.2 handle wireless connectivity, while the sole USB 3.2 Gen 1 port caps peripheral throughput at 5Gbps. The 45% NTSC colour gamut and 300-nit brightness limit colour-critical tasks.

Installation experience and common issues

Memory is maxed at 40GB with zero free slots, so no RAM upgrades are possible. The M.2 SSD can be swapped, though the resealed chassis may show opened tamper seals. Driver updates for Intel Iris Xe graphics and the AX211 wireless module occasionally require manual installation after a clean Windows 11 Pro setup. The 45Wh battery supports Rapid Charge to 80% in one hour.