Loongson’s 3A5000: China’s best shot?

Loongson’s 3A5000 is the most promising domestic Chinese CPU we’ve seen so far. Compared to the Zhaoxin KX-6640MA and Phytium D2000, Loongson’s 3A5000 is a wide core with a better balanced backend and a better cache hierarchy. But it suffers the same fundamental issues as the other two in its quest to be a general purpose CPU. Loongson’s LA464 simply cannot deliver performance in the same class as any recent Intel or AMD architecture. Compared to its western counterparts, LA464’s architecture is smaller, the L2 and L3 caches are worse, and the DDR4 memory controller is embarrassingly bad. Even though Loongson has gotten their cores up from 1 GHz to 2.5 GHz, no one runs desktop or even laptop CPUs at clocks that low. Because of its massive clock speed deficiency, Loongson can’t even get in to the same performance ballpark as recent desktop CPUs. It even struggles against Neoverse N1 running at 3 GHz.

This is a far more detailed looking at these processors than we posted a few days ago.


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