The chipset is an HM77 (spec code SLJ8C). The 2.3GHz quad-core model uses an i7-3615QM processor (not a QE).

The late 2012 Mac Mini server uses an i7-3615QM (2.3GHz model, confirmed I have this one), or i7-3720QM (2.6GHz model). While the processor design itself is capable of supporting 32GB RAM (as you have seen on ark.intel.com), this would actually require 4 memory slots. To see this you need to dig a little further into the data sheets from Intel which state: "1Gb, 2Gb, and 4Gb DDR3 DRAM device technologies are supported. Using 4Gb DRAM device technologies, the largest memory capacity possible is 32 GB, assuming Dual Channel Mode with four x8 dual ranked DIMM memory configuration. Note: 2 DIMMs per channel supported only in Quad-Core rPGA package only" Please consider the above statement carefully if you are not familiar with memory geometry and rank. Unfortunately the Mac Mini motherboard uses the BGA type processor package (not the rPGA socket) and only has two slots for RAM (one DIMM per channel), so you are limited to 16GB total RAM.