HiFive Pro P550 (sifive.com)

ddr5 and pcie gen 5

this is just awesome. also the cpu spec : a thirteen-stage, triple-issue, out-of-order pipeline

dont know how effort it would be to use amd gpu with open source drivers

The SoC features private L2 memory, with 128KB allocated to each core, while a total of 2MB L3 cache is shared among all four cores. The SoC operates in excess of 2GHz, according to Intel. Another important thing to remember is that the Pro 550 is built by Intel Foundry Services on the Intel 4 process (aka 7nm in traditional process node parlance).