hello, i'm building a gaming system with the asrock FM2A75 Pro4-M motherboard and AMD A10-5800K APU processor. i'd like to have about 8GB or 16GB of ram.

i'm not sure which RAM i should buy. i'd like some fast ram because i heard the APU performs well with really fast ram above 1866. can someone suggest compatible ram for my MOBO & CPU combination?

thanks.

p.s, is 16GB overkill? i want to run windows 7 pro 64bit without virtual memory but i don't want to get out of memory errors. is 8GB good enough?