The Spanish Computer History Museum created a permanent exhibit modeled after the Cray-1 using 30 retired Mac minis. In the benchmarks listed in reports, this cluster achieved 1.5 trillion floating-point operations per second.
These 30 Mac minis are all models from 2012 to 2014, with five featuring quad-core Intel Core i7 processors and 25 featuring dual-core Intel Core i5 processors, totaling 70 compute cores. Each node runs macOS Mojave and distributes computational tasks via MPI.
The exhibit replicates the appearance of the Cray-1, using natural convection cooling and featuring a stylized terminal. Reports compared the cluster's benchmark results to the original Cray-1's theoretical peak of approximately 160 million floating-point operations per second, yielding a magnitude of about 9,000 times; these two figures come from different eras and use different statistical methodologies.
The museum team also plans to raise funds through crowdfunding for approximately 80 Mac minis equipped with M4 chips to further expand the computing cluster. This remains part of the team's current plan.