AMD Ryzen 5 7640U with six Zen 4 cores spotted on Geekbench, almost as fast as a Ryzen 9 6900HX

Even though the official launch of AMD’s U-series Zen 4 Phoenix mobile processors for ultrabooks may still be a few months away, we can already get an idea about their performance gains thanks to a new Geekbench test for the Ryzen 5 7640U model. This is supposed to be the six-core successor of the Ryzen 5 6600U and the benchmark results show considerable performance uplift especially in multi-core loads where the R5 7640U is fairly close to the last gen R9 6900HX.

Geekbench reports that the R5 7640U was tested on the Maya-PHX platform, so this “leak” was most likely facilitated directly by AMD. The database entry informs that this processor comes with a Radeon 760M iGPU featuring 8 RDNA 3 cores. Base operating speed was set to 3.5 GHz, while maximum frequencies could hit 4.89 GHz. Each core gets 1 MB of L2 cache, and the testbed also includes 16 GB of RAM, probably LPDDR5. Minimum TDP should be 15 W, although it is not stated in the database entry.

According to WCCFtech, the Geekbench score of 1896 points in single-core mode puts the R5 7640U in front of the R9 6900HX and R5 6600U by 300 points (25% performance uplift). In multi-core mode, the R5 7640U is 60% faster than the R5 6600U, but it lags behind the R9 6900HX by ~15% due to having two fewer cores. Moreover, Benchleaks on Twitter estimates that the Phoenix-U APU is 8.2% faster in single-core mode, but 17.6% slower in multi-core mode compared to a Ryzen 7 5800X desktop-grade processor.

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