I can't wait for HMB to come to Nvidia, and others. I remember when I was first getting into computers, GDDR5 was the new thing. It was on the 4870 or something like that, then the 5000 series.
Also, Would there would be any performance difference if you were to put 12gb of HBM memory on a Titan X? or any other card that still uses GDDR5? I would love to see that.