AMD Zen 4 ‘Raphael’ R9 7900X offers massive 180% increase in L3 cache bandwidth

HXL , a well-known whistleblower, recently shared a mysterious picture on Twitter. After much speculation, it turned out to be the L3 Cache test of the new AMD R9 7900X processor. 

It seems the Zen4 chip has fallen into the hands of HXL. So now we have some tests of the rather stealthy AMD Ryzen 7000 processors.

Using the AIDA64 testing tool, we ran several benchmarks where our R9 7900X scored an impressive 1494.8 GB/s, 1445.7 GB/s and 1476.6 GB/s in the L3 Write, L3 Read and L3 Copy tests respectively.

Even latency has improved a lot, with the new 7900X hitting a new low of 10.1ns (lower is better).

Of course, I can post numbers all day and no one blinks an eye. So, to put these benchmarks into perspective, I’ve compiled some relative performance charts.

A little look at this chart clearly shows that the new R9 7900X is in the lead. The Zen4 King and Alder Lake King gain 10.5ns and 15.5ns respectively. Of course, it won’t be AMD vs. AMD. Taking the Intel i9-12900K as a competitor, the new chip is 34% faster in latency than Intel’s best offerings.

Zen4 L3 cache latency vs Alder Lake

Yes, yes, I did not forget about the write / read / copy benchmarks. The R9 7900X breaks all previous records with 1494.8 GB/s, up 17%. Moving on to the L3 reading tests, Zen4 eats away at Alder Lake (not literally), taking an astounding lead of over 180%. The same picture is observed for L3 copy speed, where Alder Lake is 45% behind. 

L3 cache speed Zen4 vs Alder Lake

So, if we take these tests literally, then Zen4 should be about 50% faster than Alder Lake. Not exactly, take a look at the R9 5950X in the same tests, it has almost the same results. Also, L3 Cache doesn’t really detect your FPS and CPU-Z ST numbers, where Intel seems to have broken the 1000 barrier (many times).

As for AMD, Zen4 processors are expected to be released on September 15th.

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