StorageReview takes a look at the Dell PowerEdge R660 E3.S Backplane
A quote from the article:
The Dell PowerEdge R660 is a 1U rackmount server designed to support the latest and greatest in server technology, including E3.S Gen5 storage, DDR5 memory, and configurations with liquid CPU cooling. It features support for two processors (dual sockets), 32 RDIMMs, and up to three graphics cards.Dell PowerEdge R660 E3.S Backplane Review