guys..i have problem with this,

trying to raıd 0 with 4 x samsung but i already get same results with 2xsamsung raıd0..

so i try different board..

i try different harddısk,all same,

so there is a limit on 300mb..raıd cant go over 300mb..so why?is this a amd problem?amd systems doesnt use 4 hdd on raıd0?pls help me..

i am getting 250mb avarage with 2xsamsung (max 280 around)
and
i am gettting 270mb avarage with 4 samsung (max 325 around)

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4 samsung f3 500gb

gigabyte 890FXA-UD5 board