I need fast ram for apus but the ones on pcpartpicker aus are expensive (2133 mhz-8gb) but the 1866 mhz is really cheap so wondering if it will be to slow to bring out the full power of an apu
On the particular APU 1866Mhz is enough as it does not have the full GPU enabled so it does need the bandwidth as much as the full GPU on say the A10-7890K or A10-7850K.. If you really need a powerful gpu your are always better of getting a dedicated gpu card. So I would say get the 1866Mhz RAM (make sure you get a dual channel kit to get the most out of your APU).
On the particular APU 1866Mhz is enough as it does not have the full GPU enabled so it does need the bandwidth as much as the full GPU on say the A10-7890K or A10-7850K.. If you really need a powerful gpu your are always better of getting a dedicated gpu card. So I would say get the 1866Mhz RAM (make sure you get a dual channel kit to get the most out of your APU).