What on earth would use more than 6gb of memory lol, i get your point though but still cannot think of anything that would use 6gb of memory. Maybe someone can enlighten me as to what would use 7-10gb of memory.
As you say the difference between 667 and 800 is hardly noticeable if you ask me.
I have ddr 1066 and run it at ddr 1200 and notice no difference at all
Infact i wasted my money buying ddr 1066 because at 1200 i can't notice the gain over my old 800 sticks. I think this whole memory speed thing is a gimmick made to sell memory

. Sure my system is 1% faster than my old ddr 800 but that came at a price of 1.2k, hardly worth it if you ask me.