By employing new circuit architecture, Samsung’s DDR4 will be able to run from 1.6 up to 3.2Gbps, compared to today’s typical speeds of 1.6Gbps for DDR3 and 800Mbps for DDR2.
they say they've doubled the speed, i beleive them. how did you make up the 5-10% gain? oh nevermind you DID make it up.
if you've actually checked with modern hardware, boosting memory speed gives us minimal gains. the boosts need to be made on the memory controller end. giving us faster MHz, tighter timings and lower operating voltages is all we need memory to do, and improve on.