hynix dram is ok; at least they're stable at stock speed. for oc i'm not sure.
like the article said, it's better to get 240gb range for better performance.

when each nand has larger capacity, that means fewer nand chips are used in ssd, which in turn means parallelism needed for sustaining ssd performance will be reduced further. this happened to crucial drives before, resulting their small capacity ssd to become under-performed/slower than advertised.

edit: note that this doesn't mean the new samsung ssd 850 is bad. from the charts, they are still performing rather fine.

nah. it's not easy to replace the places of 850 evo/pro in consumer sata ssd category.

850 is entry-level ssd. it will be much cheaper.

on the other hand, maybe there will be new stuff coming up.