https://www.techpowerup.com/300326/...0-thread-processor-also-readies-ryzen-3-7300x
Like other Zen 4 chips, they're DDR5 only.
Intel's Hybrid architecture has a key payoff, and that's with multi-threaded application performance. The E-cores may be tiny, but offer impressive performance, and when deployed in large-enough numbers, have an enormous impact on the multi-threaded performance. The 8P+16E Core i9-13900K beating the Ryzen 9 7950X; and more importantly, the 6P+8E Core i5-13600K beating the Ryzen 7 7700X, is forcing AMD to reconsider CPU core-counts across its product-stack. The first sign of this is the discovery of a Geekbench submission, where the popular benchmark detects the unreleased Ryzen 7 7800X as a 10-core/20-thread processor.
There's another equally interesting processor that surfaced on Geekbench—the Ryzen 3 7300X. [...] The Ryzen 3 7300X is a 4-core/8-thread processor with "Zen 4" CPU cores (confirmed to be "Zen 4" based with the 1 MB/core L2 cache size). The processor has a single "Zen 4" CCD, with four cores disabled, but the L3 cache left untouched at 32 MB. The chip has an impressive 4.50 GHz base frequency, and 5.00 GHz boost.
Like other Zen 4 chips, they're DDR5 only.