No, an Asus A320m-k is not compatible with 3000MHz RAM.
No, an Asus A320m-k is not compatible with 3000MHz RAM.
It doesn't matter, all A320 chipsets only handle up to 2666mhz memory. If you can't pay for 2x8gb=16gb, aim for 2x4gb=8gb because dual-channel is essential for performance. The R3 1300X isn't worth it since the R3 1200 can be overclocked to match or exceed it at a lower cost—choose the 1200 or upgrade to the R5 1400 for SMT. Definitely pick B450; even the cheapest B450 will outperform any board with the A320 chipset.
Consider purchasing a different model, like 2x4GB instead of 1x8GB.
Remarkable how they reacted so poorly; their main goal was simply to prevent you from purchasing the A320 chipset. With that chipset, you can run RAM up to 3200 MHz, which is what I have right now. Clearly, you couldn’t run OC in the processor, but the memory would still work.