A:Answer There isn't an i6 processor but assuming you mean the i5 i'll put an explanation below.
the intel core series consists of three different brands of processors the i3, i5, & i7. The higher the number the better the processor in a given category of computer, for example an i7 processor with a model number ending in U is for an ultrabook or thin and light machine this i7 processor is not the same as one in a desktop or desktop replacement laptop which will end in K & HQ respectively.
the easiest way to comprehend this is to compare it to BMW's cars. There is a 3 series, 5 series, & 7 series. now think of the letters U, HQ, and K as engine sizes U= four cylinder engine HQ= six cylinder and K=8 cylinder
so and Intel core i3 in an ultrabook would be like the basic 3series with a four cylinder engine, an i7 in the same computer would be like throwing a turbocharger on that same engine.
i hope this long winded explanation helps
