Xbox Series X vs Series S System Architecture Comparison

Microsoft designed the Xbox Series X and Xbox Series S with a unified architectural philosophy, ensuring compatibility across both platforms while targeting different performance tiers. This article explores how the central processing units, graphics engines, and memory structures align between the two consoles, highlighting where they share DNA and where they diverge to meet specific resolution and framerate goals. Readers will gain a clear understanding of the technical similarities that enable cross-generation gaming and the hardware distinctions that define each system’s capabilities.

Shared Core Foundation

At the heart of both consoles lies a custom system-on-chip (SoC) designed in partnership with AMD. Both the Series X and Series S utilize an eight-core CPU based on the Zen 2 architecture. This alignment ensures that game logic, physics calculations, and AI processing behave consistently across both devices. Developers can optimize titles for the shared instruction set, knowing that the fundamental computational approach remains the same, even if the clock speeds vary slightly between the two models.

Graphics Processing Units

While the underlying graphics architecture is identical, utilizing AMD’s RDNA 2 technology, the implementation differs significantly to accommodate price and performance targets. The Xbox Series X features 52 compute units running at 1.825 GHz, delivering approximately 12.15 teraflops of processing power. In contrast, the Xbox Series S contains 20 compute units clocked at 1.565 GHz, resulting in roughly 4 teraflops. Despite this disparity, both GPUs support hardware-accelerated DirectX Raytracing and Variable Rate Shading, ensuring that visual features remain consistent even if the fidelity differs.

Memory and Bandwidth

System memory is another area where the architecture aligns in type but diverges in capacity and bandwidth. Both consoles use GDDR6 memory integrated directly with the SoC to minimize latency. The Series X is equipped with 16GB of memory, split into a high-bandwidth partition for the GPU and a standard partition for the system. The Series S utilizes 10GB of GDDR6, with a similar split but lower overall bandwidth. This configuration allows the Series S to maintain the architectural benefits of unified memory while operating within a stricter power and cost envelope.

Storage and Input/Output

The storage subsystem represents one of the strongest points of architectural alignment. Both consoles feature a custom NVMe solid-state drive designed to eliminate loading bottlenecks. They share the same I/O throughput architecture, including the hardware-based Decompression Block and the Velocity Architecture software stack. This ensures that game assets stream at comparable speeds relative to the data required for each resolution tier. Additionally, both systems support the proprietary Storage Expansion Card, allowing users to expand storage without sacrificing the custom SSD performance.

Performance Targets and Alignment

The ultimate goal of this architectural alignment is to provide a seamless ecosystem. The Series X targets native 4K resolution at up to 120 frames per second, leveraging its superior GPU and memory bandwidth. The Series S targets 1440p at up to 120 frames per second, often employing upscaling techniques to reach 4K displays. By keeping the CPU and SSD architecture nearly identical, Microsoft ensures that games load quickly and run logically the same way on both machines, with the primary differences manifesting in visual fidelity and resolution scaling.