RAM upgrade issues

nve · January 18, 2021

Hi guys I bought some time ago old office PC with Asrock A320m HDV MOBI, AMD A10 9700E APU and 4 GB RAM Micron 2133 Mhz.

The thing is single stick of RAM of 4GB is pretty bad, especially for APU and want to upgrade it. But in my country same speed isn't sold at all. Furthermore Micron is also not sold as RAM. So can I mix my RAM? For instance there's 2400 Mhz stick with same latency CL 15-15-15-36. SInce my board have only two slots, it had to go dual channel or bust.

And secondary question, I read you can change RAM frequency in BIOS but I can't access RAM settings (not clickable) Is this a motherboard thing or just the original RAM can't be configure lack lack of XMS?