I have intel dh67cl motherboard, my motherboard supports ram not higher then 1333mhz , recently my ram stick got faulty and dead now , i wnat to buy new ram but 1333mhz ram is more expensive almost 40% more then that of 1666mhz or 1800mhz should i purchase ram higher then 1333mhz ? will it work ? i can get 8gb of of 1666 or 1800 and if i go for 1333mhz i can buy only 4gb in same price plz suggest