XRING 01 lacks any SLC cache, leaving some performance on the table

Inside Xiaomi’s XRING 01: A Unique SoC Design Without SLC Cache for Reduced Power Usage

Xiaomi’s XRING 01 represents a significant leap in technology, blending cutting-edge design with practical engineering solutions to compete in today’s high-performance silicon market. The engineers faced the challenge of maintaining power efficiency while delivering top-tier performance, leading to some innovative choices.

One of these key decisions was the use of TSMC’s second-generation 3nm process. However, there’s more to the story than just selecting a state-of-the-art manufacturing partner. A detailed breakdown of the XRING 01 chipset reveals that it lacks any SLC (System Level Cache), a move that involves both risks and benefits.

By removing the SLC cache, Xiaomi sought to manage issues related to wattage overhead when the device isn’t handling heavy workloads. To compensate for the potential drop in performance due to this omission, they increased the cache across the CPU, GPU, and NPU components.

The XRING 01 boasts a 10-core CPU cluster, complete with 16MB of L3 cache. This strategic design was necessary, given the constraints of die size in comparison to competitors like the Snapdragon 8 Elite and Dimensity 9400. The smaller dimensions help keep costs in check, ensuring efficient use of space. The architecture includes each Cortex-X925 with 2MB of L2 cache, every Cortex-A725 with 1MB, and the Cortex-A520 with 512KB.

The ARM Immortalis-G925 GPU, with its 16 cores, features 4MB of L2 cache. Meanwhile, the custom 6-core NPU carries 10MB of cache. This robust configuration was highlighted by Geekerwan, a YouTube channel that analyzed the performance dynamics of Xiaomi’s decision to forgo SLC cache. By doing so, they reduced the risk of power inefficiencies during low-power tasks.

Xiaomi’s gamble on a 10-core CPU instead of the typical 8-core setup appears to have paid off. Benchmarks show the XRING 01 nearly matching the Snapdragon 8 Elite in multi-core performance, with Geekbench 6 results confirming minimal speed discrepancies.

Despite Xiaomi’s claims of achieving a 3 million score on AnTuTu, independent testing revealed a score about 13% lower. While the role of the missing SLC cache in this discrepancy remains unclear, the XRING 01 still stands strong against rivals like Google’s Tensor and Huawei’s Kirin, marking it as a remarkable feat in custom chipset development.

Overall, Xiaomi has crafted a brilliant piece of technology in the XRING 01, reflecting its commitment to innovation and efficiency in modern computing solutions.