Post originale di: Dan ,
So far the HDD only 21.5" model is missing the PCIe support hardware. We don't have any reports on the 27" model yet. I would buy the PCIe SSD only model and buy the largest you can afford. Then it you must add in the HDD. Frankly, you may want to wait on adding the HDD and just use an external USB3 or Thunderbolt drive (RAID being the best). It will be a good year or two before anyone offers a SSD upgrade option for this new system.