- May 4, 2000
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https://www.tomshardware.com/news/us-navy-supercomputer-cray-amd-nvidia

Assuming they are using the 64-core variation of the CPU, that's 4,536 CPUs.
The U.S. Navy Department of Defense Supercomputing Resource Center (DSRC) on Monday announced plans to install its first supercomputer with a peak performance of over 10 petaflops (12.8 petaflops to be exact).
Packing 12.8 petaflops would qualify the supercomputer to be one the top 25 most powerful computers today. However, the Navy won't finish installation for this supercomputer until 2021, so it's ranking may end up being lower by then.
This might rival Markfw's fleet.The new Cray supercomputer will feature 290,304 AMD Epyc 7002-series processor cores, 112 Nvidia Volta V100 GPUs, a 200 gigabit per second Cray Slingshot network interconnect, 590TB of memory and 14 petabytes of usable storage.
Assuming they are using the 64-core variation of the CPU, that's 4,536 CPUs.