Why would you add the overhead? * Dead simple design. * Easily hot-swappable without expensive proprietary connectors. * Low cost solution that provides adequa

Why would you add the overhead? * Dead simple design. * Easily hot-swappable without expensive proprietary connectors. * Low cost solution that provides adequate bandwidth. This isn't something that will perform better than a proper server with actual PCIe lanes, but it will perform better than a blade from two generations ago that didn't have that kind of backplane bandwidth and it will cost less to manufacture.