Terry L :
i haven't got into the scrypt N coins yet but to put 2GB ram (i would guess you mean sram, not external dram) in one 55nm ASIC is impossible (QFN) at this stage (unless using BGA with a humongous sized chip like the CPU or GPU). it's because ram itself takes huge amount of space. however if you are opting for 16nm and BGA, it might be a good bet but considering the kind of money you have to put into design and development as well as the yield, it's way less economical comparing to gpu.
using fpga and dram is a fine alternative for now.
Yeah, that guy just say you can easily add DRAM.
Who will add SRAM into it anyway? The OP also means adding DRAM is really easy and I second that.
N-Scrypt is USELESS, as the above Terry L already mentioned by saying,
it is possible to add DRAM. N-scrypt is not worth it at all, there's no such thing as ASIC resistance, people should jsut get use to that already.
Look at Bitcoin and where it got it. (skyrocketing)
when ASIC comes out, suddenly, N-scrypt coins will have the lowest hashrate of the entire world.
and unless a coin comes out with a really good network, it will just be thrown away completely.