That 240GB is on 4 sockets, so corresponds roughly to the 85GB/socket cited above, while the Power7 compared was about half the Intel, so about 50GB/socket, while Power8 is allegedly at 240GB/socket.
Thanks for the clarification. HN took ~30-40 minutes before it would show a reply option for this post, so I went ahead and acknowledged the performance difference in a reply to my original reply (ugh). Anyway, that's great to see such high memory bandwidth per socket, rather than summed over the whole machine.
But I'll respond anyways. It looks like you have GB and Gb per second confused. One is 8x the other.
admin-magazine: claims 120Gb/s [1]
intel claims: 246Gb/s [2]
Independent claims on intel forums range from 120-175Gb/s [3]
Intel's cut sheet for their own latest generation xeon states it only supports 25GB/s (200Gb/s) memory bandwidth [4]
[1] http://www.admin-magazine.com/HPC/Articles/Finding-Memory-Bo...
[2] http://www.intel.com/content/www/us/en/benchmarks/server/xeo...
[3] https://software.intel.com/en-us/forums/topic/383121
[4] http://ark.intel.com/products/75465/Intel-Xeon-Processor-E3-...