ASRock Rack demonstrates 1U4E1S-ARM, a single-socket 1U server leveraging Arm's newly launched AGI server processor at Computex 2026.
Arm's push to develop and sell its own server CPUs ranks among the year's most fascinating technology stories. As a long-time IP and architecture vendor, Arm ruffled considerable feathers with its announcement to design its own chips, but the decision reflected years of watching demand for Arm architecture server CPUs explode around it.
Arm's first server chip is the Arm AGI, announced in March. Though volume production is scheduled for later this year, Arm's Taiwanese partners are eager to launch the next generation of Arm servers in this red-hot market for CPUs. When Patrick mentioned that ASRock Rack's Computex booth displayed an AGI server, a visit became mandatory.
While Meta serves as Arm's first major announced direct customer, ASRock Rack is a launch supporter for the AGI CPU. The company announced a server design in March alongside the AGI itself: the dual-node 2OU 2OU2N-ARM server, equipped with two compute nodes powered by ASRock's ARMD12M3 motherboards. Beyond this substantial 2U server, ASRock is deploying the same AGI motherboard in a more compact 1U form factor: the 1U4E1S-ARM.
The 1U4E1S-ARM essentially halves the density of the larger 2U design, fitting one processor in 1U compared to two in 2U.
The Arm AGI CPU is the centerpiece. Manufactured on TSMC's 3nm process, it contains 136 Neoverse V3 cores. Clock speeds are modest, with the highest-clocked variant reaching 3.7 GHz, positioning the AGI toward high-density CPU deployments rather than high-performance, low-core-count configurations. Base TDP runs 300W, comparable to other contemporary server CPUs and perhaps slightly lower.
Supporting the AGI's cores are 12 DDR5 memory channels rated to DDR5-8800. Memory bandwidth and channel density have become a key competitive battleground as core counts rise and agentic AI workloads demand consistent bandwidth. ASRock Rack simplified routing by using one DIMM per channel, split across the left and right sides of the chip.
The AGI is among the first-generation server CPUs to offer PCIe Gen6 connectivity, adding complexity to PCIe lane routing, retiming, and reliability for motherboard vendors. The chip supports 96 lanes of the latest I/O standard, with CXL 3.0 capable of running atop it. The 1U4E1S-ARM exposes roughly 80 of those lanes across drive bays and expansion cards.
On the expansion side, the server provides one full-height, full-length (FHFL) PCIe Gen6 x16 slot and one HHHL PCIe Gen6 x16/x8 slot. An additional 16 lanes feed an OCP NIC 3.0 slot. ASRock Rack's board also features QSFP ports, though their configuration and controller remain unspecified.
Storage options include two M.2 slots for internal drives and four hot-swap E1.S bays at the front, each rated for PCIe Gen5 x4 speeds.
The system draws power from a pair of redundant 800-watt 80 PLUS Titanium PSUs.
Despite being unfilled at Computex, the server appeared spacious for its component density. With motherboards designed for pairing, ASRock's first 1U Arm server offers considerable internal room.
ASRock has not released further details and has yet to list the server on its website. With motherboard design complete, the company likely awaits TSMC's CPU production ramp before full launch.
While Computex's showfloor overflows with servers, few match the significance of the Arm AGI systems to the industry's future. As the first generation built on Arm's in-house CPU designs, the AGI launch signals a major shift in relationships between Arm, its customers, and server buyers. With widespread Arm adoption in server CPUs, systems like the 1U4E1S-ARM finally give Arm the opportunity to capture a direct share of that market.