Lenovo 4XG7A63619 SR645 Epyc 7643

Lenovo 4XG7A63619 AMD EPYC 7643 48-Core Processor for ThinkSystem SR645

Overview

The Lenovo 4XG7A63619 is an AMD EPYC 7643 processor option for the ThinkSystem SR645 server platform — a 48-core, 96-thread compute engine built on AMD's 7nm Zen 3 architecture. With a base clock of 2.3 GHz, a boost ceiling of 3.6 GHz, and 256MB of L3 cache, this CPU is purpose-matched to workloads that demand both high thread density and low per-core latency: large-scale video analytics, AI inference at the edge, virtual machine hosting, and data-intensive surveillance back-end processing. If you're speccing out an SR645 and need to maximize concurrent workload throughput without stepping up to a higher-TDP socket, the 4XG7A63619 occupies a well-balanced position in the EPYC 7003 lineup.

Key Features

• 48 Cores / 96 Threads (AMD EPYC 7643): At 96 threads on a single socket, the SR645 with this processor can run dozens of simultaneous VM instances or analytics pipelines without the coordination overhead of a multi-socket topology. For a rack server anchoring a large-scale VMS back-end, that thread count means fewer physical nodes in the stack.
• 2.3 GHz Base / 3.6 GHz Boost: The 1.3 GHz headroom between base and boost means lightly-threaded tasks — license plate recognition bursts, event-triggered analytics queries — get the clock speed they need without dedicating a high-frequency SKU to the platform. Mixed-workload deployments benefit most from this range.
• 256MB L3 Cache: A 256MB L3 cache is substantial even by EPYC standards. For workloads with large working sets — video frame buffers, database index scans, ML model inference — keeping more data on-die reduces DDR4 round-trip penalties and sustains throughput under concurrency spikes.
• Octa-Channel DDR4-3200 Memory Interface: Eight memory channels at up to 3200 MHz deliver 204.8 GB/s of aggregate memory bandwidth. For surveillance analytics or encoding workloads that stream large frame buffers, that bandwidth ceiling matters — it's roughly 3× what a dual-channel consumer platform provides. Pair with appropriately fast registered DIMMs to realize the full bandwidth.
• 7nm Lithography (Socket SP3): The 7nm process node keeps the 225W TDP manageable for a 48-core processor. At the SR645's rated thermal envelope, this CPU fits within standard 2U cooling budgets — no exotic cooling mods required, though a compatible Lenovo heatsink is required separately (cooler not included).
• 64-bit Operating Mode: Supports standard 64-bit OS deployments — Linux distributions, Windows Server, VMware ESXi — without any compatibility provisioning. No 32-bit OS constraints to plan around in a modern data center or edge compute rack.
• 225W TDP: At 225W, power budgeting for a single-socket SR645 configuration is straightforward. Factor this against your rack PDU and UPS capacity; a dual-socket configuration doubles this figure and requires careful per-rack load planning.

Integration & Compatibility

The 4XG7A63619 is a Socket SP3 processor qualified for the Lenovo ThinkSystem SR645 platform. Socket SP3 is specific to AMD EPYC 7002/7003-series server CPUs — this processor does not install into consumer AM4 or workstation WRX80 boards. Confirm SR645 firmware revision compatibility with Lenovo's product matrix before ordering, particularly in mixed-generation configurations. Memory pairing should follow Lenovo's SR645 memory population guide to achieve the rated 204.8 GB/s bandwidth; under-populated or mismatched DIMM configurations will reduce available bandwidth below the octa-channel ceiling. For NVR and analytics server deployments, validate that the platform's PCIe slot allocation supports your intended capture or GPU cards alongside this CPU's I/O lane count. Consult Lenovo's Lenovo server compatibility documentation for supported DIMM types and maximum capacity per channel. If you are building a video surveillance infrastructure around this platform, also review your network switch uplink capacity — a 48-core analytics node at full throughput can saturate a 10GbE uplink under concurrent stream ingestion.

Frequently Asked Questions

Q: Which server platform is the Lenovo 4XG7A63619 compatible with?

A: The 4XG7A63619 is a processor option for the Lenovo ThinkSystem SR645 server. It uses the AMD Socket SP3 interface and is not compatible with other server platforms or consumer motherboards.

Q: Does the 4XG7A63619 include a heatsink or cooler?

A: No. A compatible heatsink is not included with this processor and must be ordered separately. Confirm the correct Lenovo-qualified heatsink for your SR645 chassis configuration before installing.

Q: What is the maximum memory bandwidth supported by the AMD EPYC 7643 processor?

A: The EPYC 7643 supports up to 204.8 GB/s of memory bandwidth via eight DDR4-3200 memory channels. Achieving this ceiling requires full DIMM population per channel with 3200 MHz registered DIMMs.

Q: What is the TDP of the AMD EPYC 7643, and how does it affect rack planning?

A: The processor has a rated TDP of 225W. In a single-socket SR645 deployment, budget this against your PDU and UPS capacity. Dual-socket configurations double this figure, so per-rack load planning is critical at scale.

Q: What core and thread count does the EPYC 7643 provide?

A: The AMD EPYC 7643 delivers 48 physical cores and 96 threads via simultaneous multithreading. This makes it well-suited for high-concurrency server workloads including VM hosting, video analytics pipelines, and parallel data processing.

Q: What memory type and speed does the EPYC 7643 support?

A: The processor supports DDR4-SDRAM at up to 3200 MHz across eight memory channels. Non-registered or consumer DRAM is not supported in server configurations — use server-grade registered (RDIMM) or load-reduced (LRDIMM) modules as specified by Lenovo's SR645 memory guide.