LGA 3647

LGA 3647
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Name	LGA 3647
Type	CPU socket
Introduced	2016
Designed by	Intel
Form factor	Land Grid Array
Contacts	3647
Supported processors	Skylake-based Xeon Scalable processors, Cascade Lake, Cooper Lake
Memory	DDR4 SDRAM, RDIMM, LRDIMM, 3DS DIMM
Platform	Intel Xeon Scalable processor family, servers, workstations

LGA 3647 LGA 3647 is a high-pin-count land grid array socket developed by Intel Corporation for enterprise and high-performance computing platforms. It was introduced to support the first generation of Xeon Scalable processors and subsequent Cascade Lake and Cooper Lake families, enabling increased memory channels and I/O density for data center workloads. Major vendors such as Dell Technologies, Hewlett Packard Enterprise, Supermicro, and Lenovo integrated platforms around this socket for use in cloud computing, high-performance computing, and enterprise storage systems.

Overview

LGA 3647 was announced alongside the Xeon Scalable processor family to replace earlier sockets like LGA 2011-v3 and to support features required by modern Amazon Web Services, Microsoft Azure, and Google Cloud Platform deployments. The socket’s design emphasizes support for multiple memory channels and large core counts to serve workloads in artificial intelligence, machine learning, virtualization, database systems, and high-frequency trading. Major chipset and motherboard partners including Intel Corporation, Asus, Gigabyte Technology, and ASRock Rack produced server boards around this platform for integrators such as Cisco Systems and Fujitsu.

Technical specifications

LGA 3647 uses 3,647 pins in a land grid array footprint to enable electrical connections necessary for high I/O and multi-channel memory access. The socket exposes support for up to six memory channels per CPU with DDR4 SDRAM modules including RDIMM and LRDIMM types and 3DS DIMM stacking technologies used by Micron Technology and Samsung Electronics. It supports PCI Express lanes as implemented in Intel Xeon Scalable processor family designs for connectivity with NVIDIA GPUs, Intel Optane DC Persistent Memory, and Mellanox Technologies network adapters. Mechanical specifications include a large heatspreader contact area compatible with standardized heatsink mounting systems used by Noctua, Cooler Master, and server OEM cooler suppliers. Power delivery and robustness were designed to meet SPECpower and industry-oriented reliability standards adopted by Intel and industry consortiums.

Socket variants and compatible processors

Two primary mechanical and keying variants emerged: the LGA 3647-0 (commonly used for single-socket and dual-socket server designs supporting Skylake-based Xeon Scalable processor family and Cascade Lake), and the LGA 3647-1 variant tailored for Cooper Lake and certain Intel Xeon die-package differences. Compatible processor lines include the first through third generations of Intel Xeon Scalable (codename Skylake-SP, Cascade Lake-SP, Cooper Lake-SP), and select Xeon Phi derivative packages in certain OEM platforms. Major processor SKUs adopted for this socket were marketed to customers such as Facebook, Alibaba Group, and Tencent for hyperscale deployments.

Cooling and motherboard considerations

Due to higher thermal design powers of multi-socket configurations and high-core-count SKUs, cooling solutions from vendors like Delta Electronics, Delta-branded server coolers, and custom liquid cooling systems by Asetek were commonly paired with this socket. Motherboard designs from Supermicro, ASRock Rack, and Gigabyte Technology included robust multi-phase voltage regulation modules supplied by companies like Infineon Technologies and Texas Instruments to support sustained turbo frequencies under load. Form factors ranged from standard EATX server boards to purpose-built multi-socket carrier boards used in GPU compute nodes for companies such as NVIDIA and AMD accelerators paired via high-bandwidth interconnects.

Adoption and market use

Enterprises and cloud providers adopted LGA 3647 platforms for compute-dense instances and latency-sensitive applications across providers including Amazon Web Services, Microsoft Azure, Google Cloud Platform, Oracle Cloud Infrastructure, and private clouds managed by VMware, Inc. and Red Hat. OEM systems from Dell EMC, Hewlett Packard Enterprise, Lenovo, and ODMs serving hyperscalers like Quanta Computer and Wiwynn integrated LGA 3647 into rack servers, storage appliances, and edge compute platforms. Research institutions and national labs such as Lawrence Livermore National Laboratory and CERN used LGA 3647-based nodes in clusters for simulations and data analysis.

Performance and benchmarks

Performance comparisons placed LGA 3647 platforms ahead of prior LGA 2011-v3 systems for multi-threaded and memory-bandwidth-bound workloads, with benchmarks from organizations like SPEC, Phoronix Test Suite contributors, and vendor whitepapers showing improvements in throughput for HPC codes, in-memory databases such as SAP HANA, and analytics stacks used by Hadoop and Spark. Real-world performance in cloud offerings influenced instance sizing choices by companies such as Netflix, Airbnb, and Stripe, while industry analyses by Gartner and IDC highlighted the socket’s role in scaling datacenter compute density. Thermal and power measurements often informed trade-offs between clock speed and core count for customers including Bloomberg L.P. and Goldman Sachs running latency-sensitive workloads.

Category:Intel CPU sockets