Back in 2008 Virginia Tech built a cluster of Apple G5 towers: https://news.softpedia.com/news/Virginia-Tech-Deploys-29-Teraflop-Mac-Cluster-90534.shtml https:

Back in 2008 Virginia Tech built a cluster of Apple G5 towers: https://news.softpedia.com/news/Virginia-Tech-Deploys-29-Teraflop-Mac-Cluster-90534.shtml https://news.softpedia.com/news/Virginia-Tech-Deploys-29-Ter... Several universities also built clusters with Apple Xserve rack servers.