Lenovo ThinkPad E16 Gen 3 Intel U7-255U/ 16GB RAM/ 512GB SSD
PRODUCT DESCRIPTION
Lenovo ThinkPad E16 Gen 3, Intel U7-255U / 16GB RAM / 512GB SSD (21SR000DSG) - 3 Years Local Warranty
A 16-inch Business Laptop With a Full Numeric Keypad
The ThinkPad E16 Gen 3 is the large-screen member of the E family: a 16-inch WUXGA 1920 x 1200 display in a 16:10 aspect ratio, with a full-size keyboard including a numeric keypad. For finance, accounting, logistics and anyone who spends the day in spreadsheets or an ERP, that keypad is the reason to choose this over a 14-inch machine.
Core Ultra 7 255U: 12 Cores, Turbo to 5.3 GHz
This build carries Intel's Core Ultra 7 255U — 12 cores (2 performance, 8 efficient, 2 low-power efficient), 14 threads, turbo to 5.3 GHz and 12MB of cache. It sits on the Arrow Lake platform with the upgrade headroom that brings.
Memory to 64GB and Two Storage Slots
Two DDR5-5600 SODIMM slots supporting up to 64GB, and two M.2 slots — one 2242 and one 2280, both PCIe 4.0 x4. Supplied with 16GB and a 512GB Opal 2.0 drive, this is a machine that can be grown rather than replaced when requirements change.
16:10 Screen, Gigabit Ethernet, Thunderbolt 4
The 16:10 panel gives noticeably more vertical space than a traditional 16:9 laptop — more spreadsheet rows and more of a document visible at once. Connectivity covers Thunderbolt 4 / USB4 at 40 Gbps, a second USB-C at 20 Gbps, two USB-A ports, HDMI 2.1 and gigabit RJ-45 ethernet.
Lenovo ThinkPad E16 Gen 3 Datasheet — Technical Specifications
General
| Product | Lenovo ThinkPad E16 Gen 3 |
| Part Number | 21SR000DSG |
| Machine Type | 21SR |
| Operating System | Windows 11 Pro 64-bit |
| Warranty | 3-Year Onsite, per the distributor configuration for this part number |
| Local Warranty (Singapore) | Included with every SourceIT purchase, with GST invoice |
Processor & Graphics
| Processor | Intel Core Ultra 7 255U (Arrow Lake) |
| Cores / Threads | 12 cores (2 P-core + 8 E-core + 2 LP E-core) / 14 threads |
| Base Frequency | P-core 2.1 GHz / E-core 1.7 GHz / LP E-core 700 MHz |
| Max Turbo | P-core 5.3 GHz / E-core 4.2 GHz / LP E-core 2.4 GHz |
| Cache | 12MB Intel Smart Cache |
| Graphics | Integrated Intel Graphics, up to 8 TOPS |
| NPU | Intel AI Boost |
Memory & Storage
| Memory Supplied | 16GB DDR5-5600 SODIMM |
| Memory Architecture | Two DDR5 SODIMM slots, dual-channel capable — socketed, not soldered |
| Maximum Memory | 64GB |
| Storage Supplied | 512GB M.2 2242 PCIe 4.0 x4 NVMe SSD with Opal 2.0 |
| Storage Architecture | Two M.2 slots — one M.2 2242 and one M.2 2280, both PCIe 4.0 x4 |
Display
| Screen Size | 16" |
| Resolution | WUXGA 1920 x 1200 |
| Aspect Ratio | 16:10 |
| Panel Type | IPS, anti-glare |
| Brightness | 300 nits |
| Colour Gamut | 45% NTSC |
| Refresh Rate | 60 Hz |
Ports & Connectivity
| Thunderbolt / USB-C | 1x USB-C Thunderbolt 4 / USB4 40 Gbps; 1x USB-C 20 Gbps (USB 3.2 Gen 2x2) |
| USB-A | 1x USB-A 5 Gbps (USB 3.2 Gen 1); 1x USB-A 10 Gbps (USB 3.2 Gen 2), Always On |
| Video Out | 1x HDMI 2.1 |
| Ethernet | 1x RJ-45 gigabit |
| Audio | 1x 3.5 mm headphone / microphone combo jack |
| Wireless | Wi-Fi 6E AX211 2x2, Bluetooth 5.3 |
| WWAN | Not supported on this model |
Battery & Power
| Battery | 64Wh Li-ion |
| Charging | Rapid Charge |
| AC Adapter | 65 W USB-C |
Security & Manageability
| TPM | Discrete TPM 2.0, TCG certified, FIPS 140-3 certified |
| Physical Lock | Kensington Nano Security Slot |
| Keyboard | Full-size 6-row with numeric keypad, backlit, spill-resistant, Copilot key, TrackPoint and precision touchpad |
Physical & Durability
| Dimensions | 356 x 249 x 21.15 mm maximum (10.1 mm front / 17.05 mm rear) |
| Weight | From 1.63 kg (3.59 lb) |
| Chassis | Aluminium top with PC-ABS or aluminium bottom; black |
| Durability | MIL-STD-810H military test passed |
| Audio | Stereo speakers with Dolby Atmos, audio by HARMAN |
| Certifications | ENERGY STAR 9.0; EPEAT 1.0 Gold; TCO Certified generation 10; RoHS |
Configuration-Dependent Items
| Camera and Fingerprint Reader | The E16 Gen 3 offers a 5.0MP camera or an FHD 1080p + IR hybrid, and an optional power-button fingerprint reader. Ask us to confirm which are fitted to this build |
| Processor Verification | An earlier version of this listing carried a conflicting claim of a Core Ultra 7 255H with 16 cores. This page states the Core Ultra 7 255U that matches the part number and title; we are confirming the processor with the distributor and will correct the page if the 255H proves correct |
| Free M.2 Slot | Two slots exist and one is occupied. Confirm the second is free before planning a storage upgrade |
Compatibility & Fit
Buy this for the screen and the keypad. A 16-inch 16:10 panel and a full numeric keypad make this the E-series machine for spreadsheet-heavy and data-entry roles. The cost is portability: at 1.63 kg it is around 300 g heavier than the 14-inch E14 Gen 7 and noticeably larger in a bag.
Upgrade headroom is the other reason. Two DDR5 SODIMM slots to 64GB and two M.2 slots mean this machine can be re-specified in service rather than replaced — useful when a finance or engineering user outgrows 16GB two years in.
One thing we are actively checking. The previous version of this listing asserted two different processors on the same page: a Core Ultra 7 255U with 12 cores in the body, and a Core Ultra 7 255H with 16 cores in the specification block. Those are materially different chips. This page states the 255U, which matches the product title and the part number as supplied to us, and we have removed the conflicting claim. If your purchase depends on the distinction — the 255H is a higher-power part with more cores and Arc 140T graphics — ask us and we will confirm with the distributor before you order.
Ports and docking: Thunderbolt 4 with a second 20 Gbps USB-C, two USB-A, HDMI 2.1 and onboard gigabit ethernet. It shares its port layout with the E14, so one dock specification covers a mixed E-series fleet.
Package Contents & ThinkPad Ordering Information
In the box: ThinkPad E16 Gen 3 laptop, 65 W USB-C AC adapter, and documentation. Windows 11 Pro is pre-installed. Some configurations of this part number have also been supplied with a Lenovo carry case — ask us to confirm for your order.
ThinkPad Ordering Information
| 21SX000GSG | ThinkPad E14 Gen 7 — Intel Core Ultra 5 225U, 16GB, 512GB |
| 21U2001JSG | ThinkPad E14 Gen 7 — Intel Core Ultra 5 226V, 16GB, 512GB |
| 21SR000DSG (this listing) | ThinkPad E16 Gen 3 — Intel Core Ultra 7 255U, 16GB, 512GB |
| 21R5002BSG | ThinkPad L13 Gen 6 — Intel Core Ultra 5 225U, 16GB, 512GB |
Datasheet & Downloads
- Lenovo PSREF specification book — ThinkPad E16 Gen 3 (Intel) (PDF)
- Lenovo PSREF product page — ThinkPad E16 Gen 3 (Intel)
- Lenovo per-part-number configuration (21SR000DSG) on PSREF
The PSREF specification book documents the ThinkPad E16 Gen 3 (Intel) platform — chassis, ports, memory architecture and certifications, which are fixed for the machine type. The per-part-number link opens Lenovo's configuration record for this exact SKU and renders in a normal browser; it is the definitive reference for the options fitted to this particular build.
Frequently Asked Questions — Lenovo ThinkPad E16 Gen 3
Does it have a numeric keypad?
Yes — the 16-inch chassis has room for a full-size keyboard with a numeric keypad, which the 14-inch E14 does not.
Which processor does it actually have?
This page states the Core Ultra 7 255U, 12 cores and 14 threads, matching the part number and title. The previous listing also carried a conflicting Core Ultra 7 255H claim, which we removed. If the distinction matters to your purchase, ask us and we will confirm with the distributor first.
Can I upgrade the memory and storage?
Yes on both counts — two DDR5 SODIMM slots to 64GB, and two M.2 slots. Confirm with us which are free on your unit before ordering parts.
How much heavier is it than the E14?
About 300 g — from 1.63 kg against 1.32 kg — and physically larger. If the machine travels daily, the E14 is the easier carry.
Is the 16:10 screen better than 16:9?
For documents and spreadsheets, yes. The taller aspect ratio shows more rows and more of a page without scrolling.
Does it have wired ethernet?
Yes, gigabit RJ-45 on board.
What warranty does it come with?
3-year onsite service per the distributor configuration for this part number, plus local Singapore warranty and a GST invoice from us. Lenovo's PSREF book lists 1-year options as the model's base term, so keep the invoice with your asset record.
