The Loongson 3C6000 server CPU, jointly developed by the Microprocessor Research Center of Institute of Computing Technology, Chinese Academy of Sciences and Loongson Technology Co., Ltd, is based on the LoongArch instruction set architecture and manufactured using 12nm process. With a main frequency of 2.2 GHz, it achieves a peak performance of 844.8 GFLOPs with double-precision floating-point, positioning it as a competitive alternative to mainstream international server CPUs.
The Loongson 3C6000 integrates 16 64-bit six-issue LA664 processor cores, supporting virtualization technology and delivering a significant improvement in general-purpose processing performance compared to its predecessor. The LA664 core features simultaneous multithreading technology, incorporating 4 integer units, 4 vector units, and 4 memory access units. It includes 64 KB of L1 instruction cache and 64 KB of L1 data cache per core, along with 256 KB of private L2 cache. The CPU achieves a SPEC CPU2006 benchmark score exceeding 17 points/GHz.
The Loongson 3C6000 employs a MESH-based on-chip interconnect network, integrating 32 MB of shared L3 cache on a single die. It supports 4 channels of 72-bit DDR4-3200 memory with ECC, significantly enhancing memory access efficiency and doubling the memory bandwidth compared to the Loongson 3C5000. It also integrates 64 lanes of PCIe-4.0 I/O links, offering an order-of-magnitude improvement in I/O performance over the Loongson 3C5000. Additionally, it includes a dedicated security processor module, supporting high-performance national cryptographic standards such as SM2/3/4, with SM3 encryption and decryption bandwidth exceeding 16 Gbps.
The Loongson 3C6000 introduces the proprietary LoongLink (Loongson Coherent Link) for inter-die connectivity, supporting the Loongson cache coherence protocol. This technology is designed to compete with high-speed interconnects like NVLink and CXL, addressing key challenges in Chiplet-based integrated chip design. Leveraging LoongLink and advanced packaging technology, the Loongson 3D6000 server CPU can be configured with two dies, offering 32 cores and 64 threads, while the Loongson 3E6000 server CPU can be configured with four dies, providing 64 cores and 128 threads.
In benchmark tests, the Loongson 3C6000 demonstrates performance comparable to Intel's Xeon Silver 4314 (16 cores, 32 threads, 2.4 GHz) from 2021. The dual-die Loongson 3D6000, equipped with 8 channels of 72-bit DDR4-3200 memory, achieves performance on par with Intel's Xeon Gold 6338 (32 cores, 64 threads, 2.0 GHz) from 2021.
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