twice as many blades
But half the amount of memory slots per blade it seems like
The G7 while double wide has 64 slots, Gen8 has 32
G7, I guess as you might expect taps out at 2TB of max ram, Gen8 taps out at 1TB
http://h18004.www1.hp.com/products/quickspecs/13742_na/13742_na.html
http://h18004.www1.hp.com/products/quickspecs/14394_na/14394_na.html
Nice to have the option I guess but I guess HP realized most customers would rather have 2 x quad socket 32-DIMM systems in the same space vs 1 x quad socket 64-DIMM system.