What kind of benefits would using large amount of HBM3 memory would have on the Grace CPU ? How big of an improvement in common tasks ? Or is it just an overki

What kind of benefits would using large amount of HBM3 memory would have on the Grace CPU ? How big of an improvement in common tasks ? Or is it just an overkill for a CPU, in general ? Have they solved the "Memory Wall" for CPU's with their current implementation ?