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What form factor are those NVMe drives and how are the connected? I see cables, so I'm assuming they're not all plugged straight into their own PCIe slot. Are there a bunch of M.2 headers on the motherboard?

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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...

Almost definitely U.2 drives that slot into the front of the server. Here's a cartoony view of what that looks like (on a P5800X Optane SSD): https://www.servethehome.com/new-intel-optane-p5800x-100-dwp...

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