I think you vastly underestimate just how much slower DRAM is compared to cache (SRAM). Your super fast CPU will be sitting idly doing nothing if it were not fo

I think you vastly underestimate just how much slower DRAM is compared to cache (SRAM). Your super fast CPU will be sitting idly doing nothing if it were not for the caches between it and DRAM, which keep it fed with data and instructions.