ddr3 1600mhz vs 2133mhz without ssd and gpu

i have purchased a used Lenovo branded pc, Thinkcentre M79 Tower Processor AMD A8 PRO-7600B R7, 10 Compute Cores 4C+6G, 3100 Mhz, 2 Core(s), 4 Logical Processor(s) builtin is R7 graphics with feature level DirectX12 so i don't need dedicated graphics card. when i use dual Ram it's working as...