What You Need to Know About Server CPUs, GPUs, and Memory

Server CPU Basics

CPU is the brain of a computer, consisting of the arithmetic‑logic unit (ALU), cache, and the bus that connects data, control, and status signals. Modern server CPUs include the Intel Xeon Cooper Lake family, which follows the Cascade Lake lineage and is built on a 14 nm process.

Two main platform codename families are relevant:

Whitley platform : uses Socket P4 and supports both Cooper Lake‑4 and Ice Lake‑SP processors, combining 14 nm and 10 nm architectures on the same socket.

Cedar Island platform : uses Socket P5 and is limited to Cooper Lake‑6 or Cooper Lake‑P CPUs, offering up to 26 cores, 14 nm process, six memory channels, and PCIe 3.0.

Server GPU Basics

GPU (Graphics Processing Unit) is a specialized processor for image and parallel computation, acting as the "heart" of graphics cards in PCs, workstations, game consoles, and many mobile devices.

The first full‑featured compute architecture was NVIDIA’s Fermi, featuring 512 accelerator (CUDA) cores, 16 streaming multiprocessors (SM), and ECC support. Since then, NVIDIA has released eight generations, with the latest being the Ampere architecture built on TSMC 7 nm, offering TF32 third‑generation Tensor Cores, NVLink 3, and structural sparsity for unified training, inference, and data analysis workloads.

Key GPU product families include the A100 accelerator, which exemplifies the Ampere generation, and earlier generations such as Pascal, Volta, and Turing, each introducing improvements in core count, memory bandwidth, and specialized tensor operations.

Server Memory Basics

Servers typically use DDR4 memory modules. All installed DIMMs must be of the same model and operate at a uniform speed, which is determined by the lowest of the following factors:

The maximum memory speed supported by the CPU.

The maximum speed allowed by the specific memory configuration.

Compatibility constraints: different types (RDIMM vs. LRDIMM) and specifications (capacity, bus width, rank, height, etc.) cannot be mixed.

Understanding these components and their compatibility constraints is essential for designing reliable and high‑performance server systems.