Intel Processors for Socket FCLGA3647 – Buy Used Xeon Scalable CPUs at GEKKO

What Is Socket FCLGA3647?

Socket FCLGA3647 is the physical interface used to mount first- and second-generation Intel Xeon Scalable processors, known under the codenames Skylake-SP and Cascade Lake-SP, onto the motherboard. The designation refers to the Flip Chip Land Grid Array design with 3647 contact points. In the FCLGA layout, the pins are located in the socket itself, while the underside of the processor features only flat contact pads. This design enables a very high contact density in a compact footprint and forms the technical basis for the complex signal paths required by a platform with six memory channels and multiple UPI links. If you find this socket in your own server, you can assume you are dealing with a platform designed for continuous professional use, as it was developed exclusively for the Xeon Bronze, Silver, Gold, and Platinum ranges.

The Purley Platform: Chipset, Memory Connectivity, and Multi-CPU Communication

Processors using Socket FCLGA3647 run on the so-called Purley platform, which is based on the Intel C620 chipset, codenamed Lewisburg. This combination enables six memory channels per processor, making it possible to install large amounts of ECC memory to support demanding applications such as databases, virtualization environments, and other data-intensive workloads. In multi-processor systems, Intel relies on Ultra Path Interconnect, or UPI: via two or three UPI links, multiple CPUs can exchange data directly with one another without taking a detour through system memory. Depending on the processor family, configurations with one, two, four, or eight CPUs are possible, making this platform highly scalable for enterprise workloads.

Narrow ILM or Square ILM: An Important Detail When Buying

One detail that is often overlooked when buying processors for this socket is the design of the heatsink retention mechanism. There are two mechanically different ILM variants, Narrow ILM and Square ILM, which differ in the arrangement of the mounting holes and in the amount of space required on the motherboard. Narrow ILM is by far the more common version and is found in most motherboards regardless of the number of sockets, while Square ILM is less common and mainly used in selected compact server chassis. Which version is present depends primarily on the motherboard design rather than on the processor itself. In all cases, the heatsink and motherboard must match the specific ILM type, otherwise the cooler simply cannot be mounted correctly. Before ordering a processor for Socket FCLGA3647, it is therefore worth checking the technical specifications of the existing motherboard, especially if you are upgrading an existing system.

From Bronze to Platinum: Xeon Scalable Performance Classes at a Glance

The range of processors for Socket FCLGA3647 spans from efficient Bronze and Silver CPUs with lower core counts up to high-end Platinum models with as many as 28 cores, large cache capacities, and the maximum number of UPI links. Gold processors often represent the most practical balance between core count, clock speed, and acquisition cost, which is why they are frequently used in servers and powerful workstations. Models carrying the suffix R from the Cascade Lake Refresh generation often offer more cores and higher clock speeds than their predecessors across the Bronze, Silver, and Gold ranges, although this usually comes with slightly higher power consumption. If you are upgrading an existing system based on this socket, you can gain noticeably more compute performance per socket, but you should make sure your cooling solution is designed for the higher TDP.

Tested Quality: Socket FCLGA3647 Processors at GEKKO

At GEKKO Computer, every processor for Socket FCLGA3647 undergoes functional testing before being added to our inventory as refurbished hardware. Defective units are consistently sorted out and never offered for sale. This ensures that you receive a ready-to-use product that can be installed directly without prior testing. All listed CPUs are in stock and shipped promptly after your order is placed, which is a real advantage when fast replacement is required or when expanding an existing data center. If you also need RAID controllers to connect additional drives, you will also find suitable options in our range.

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