James Reinders has an article in InsideHPC describes Intel XeonPhi memory modes:
[…]In this article, I will discuss one of the “mode” options that Intel Xeon Phi processors have to offer unprecedented configurability: memory modes. For programmers, this is the key option to really study because it may inspire programming changes. In my next article, I’ll tackle the other mode option (cluster modes). The memory modes allow the MCDRAM to be used as either a high bandwidth cache or a high bandwidth memory, or a little of each.[…]
http://insidehpc.com/2017/03/intel-xeon-phi-memory-mode-programming-mcdram-nutshell/
Firmware Security 