I'm sorry, what was the board you wanna get??
people have had a hard time overclocking the 10xxT series to 4.0 GHz ( but able to do so at the last moment) with a motherboard like the one absic is recommending you which I too think is a good motherboard...
but now, 8 GB against the 16 GB won't do any difference on the cpu overcloking to 4 GHz, cuz either way you gonna use the 4 slots of ram WHICH is really hard for the CPU to KEEP STABLE, UNLESS you really keep those Memory sticks at 1333 MHz, which is not good (for my point of view of course) much more than 1333 MHz ram is gonna keep you from reaching 4 GHz CPU speed...
now with a 10xxT cpu you can reach the 4 GHz with RAM even at 1600 MHz with 4 stick (8 GB mostly), really gonna have a hard time reaching 4 GHz with the board absic recommended you
so, the better thing to do here is (in my own opinion);
get a quad core black edition and be able to reach 4 GHz
get ram 1333 MHz with the best timings you can get, 8 or 16 GB if you want
or in the other hand
get the hexacore 1090T and be able to reach 4 GHz
get RAM 1600 MHz with the best timings, 8 or 16 GB if you want but gonna need more $ for this
in resume, to get 4 GHz cpu speed, gonna depend on the motherboard you get, cuz is mainly about stable power (Vcore) you can get to the CPU
either setup is great and way much more power than you need to do things you gonna do...
so if you wanna an advice..... get the quadcore with the board absic says but hhmmm unable to get 4 Ghz
what did I said?