U.2. The drives have PCIe lanes connected via the blue cables to the motherboard, which is then wired to the CPU. Here's a review that goes into details on the

U.2. The drives have PCIe lanes connected via the blue cables to the motherboard, which is then wired to the CPU. Here's a review that goes into details on the hardware: https://www.servethehome.com/dell-emc-poweredge-r7525-review-flagship-dell-dual-socket-server-amd-epyc/ https://www.servethehome.com/dell-emc-poweredge-r7525-review...