The Durabook S14I and the Durabook S15AB are often searched for side by side, even though they cover different sizes and, more importantly, different technology generations. This article compares both devices based on their respective current datasheets. Durabook no longer maintains a dedicated product page for the S15AB; the linked copy of the manufacturer datasheet carries no date, so its currency cannot be verified.
The S14I has a 14.0-inch FHD display (1,920 x 1,080), while the S15AB has a somewhat larger 15.6-inch Full HD display at the same resolution. Anyone needing more screen area for spreadsheets or multiple windows gets more room with the S15AB, but has to carry a larger and heavier device as a trade-off.
This is where the biggest gap between the two devices lies. Per the datasheet, the S14I uses an Intel® Core™ Ultra 5 (125U, 135U) or Intel® Core™ Ultra 7 (155U, 165U), each with up to 4.9 GHz, 12 cores, 14 threads, and integrated Intel® AI Boost for on-chip AI acceleration. The S15AB, by contrast, runs on an 8th-generation Intel® Core™ i5-8265U or i7-8565U. Several architecture generations separate the two processor families; a direct percentage clock-speed comparison cannot be reliably derived from the two datasheets, but the basic performance class is clearly different.
Per the datasheet, the S14I starts at 16 GB DDR5 RAM (5600 MHz, 2 slots) and can be upgraded to 64 GB, combined with a 256 GB PCIe NVMe SSD (optionally up to 2 TB). The S15AB offers 8 to 32 GB DDR4 RAM and a 256 GB to 1 TB SATA SSD. Both the memory technology (DDR5 versus DDR4) and the storage interface (PCIe NVMe versus SATA) are newer and faster on the S14I.
Per the datasheet, the S14I reaches IP53 and is tested to MIL-STD-810H. The S15AB reaches IP5X and is tested to MIL-STD-810G, the older predecessor version of the test standard. IP53 means protection against dust plus protection against spraying water up to 60 degrees from vertical, while IP5X only quantifies dust protection and makes no statement about water protection.
The S14I can optionally be fitted with a sunlight-readable display at 1,200 nits. The S15AB reaches 400 to 500 nits as an option, roughly matching the brightness of a classic consumer notebook. For regular use in direct sunlight, the S14I is clearly ahead.
Per the datasheet, the S14I reaches 16 hours of runtime with the main battery and can optionally be extended with a second hot-swap battery to a combined total of up to 32 hours. The S15AB reaches up to 13 hours per the datasheet with a high-capacity battery, with no documented option for a second battery. For multi-shift operation without a power outlet, the S14I offers considerably more flexibility.
Per the datasheet, the S14I is rated for -29 °C to 63 °C. For the S15AB, operating temperature is not quantified in any available source; only a direct statement from the manufacturer would be binding here.
The S14I offers two Thunderbolt 4 ports, USB 3.2 Gen 2 and Gen 1 (Type-A), two RJ45 Ethernet ports, HDMI 2.1, RS232, and dual-SIM combining Nano-SIM and eSIM for mobile reception. The S15AB offers USB 3.1 (Type-C and Type-A), USB 2.0, HDMI, VGA, and Gigabit Ethernet, but no Thunderbolt and no SIM option. In terms of modern peripheral connectivity, the S14I is ahead, while the S15AB still carries VGA, an older interface useful for legacy projectors and monitors that the S14I lacks.
Per the datasheet, the S14I combines a smart card reader with a TPM module as standard. The S15AB has TPM 2.0 and a Kensington lock built in, plus an optional smart card reader. A docking connector on the underside of the device, as offered optionally on the S14I, is not documented for the S15AB per its datasheet; a docking station can only be connected to the S15AB via its USB ports, ruling out a vehicle docking station. An overview of further security mechanisms for rugged laptops, including OPAL 2.0 drive encryption, is available in the article Rugged Laptop Security Features.
Per the datasheet, the S14I weighs 2.37 kg (varies by configuration). For the S15AB, a weight of roughly 2.6 kg and dimensions of 375 x 273 x 29.5 mm are documented. Despite the smaller display, the S14I is the noticeably lighter of the two devices.
This side-by-side comparison makes clear that these are not two variants of the same device class, but two different technology generations that happen to share a similar display size.
Even though the S14I offers the more modern technology in nearly every category, the S15AB remains in use in existing fleets, for example when replacement units are needed to keep a uniform software environment, or when replacing an entire fleet is not yet economically sensible. For new purchases, the Durabook S14I is usually the better choice, given its newer processor generation, higher rating, and longer battery life. It is also worth noting that the manufacturer no longer maintains a current product page for the S15AB, which points to an advanced product lifecycle and should be factored into long-term spare-parts planning.
Details on the Durabook S14I and ordering are available on the Durabook S14I product page, including the interactive configurator with 17 equipment groups. For the Durabook S15AB, the manufacturer no longer maintains its own product page; the core data is documented in the Durabook S15AB datasheet. For an assessment of which device fits your fleet, the team is available via the contact page.