I've heard that (I'm not experts on this, so correct me if i am wrong) making SRAM is huge different than making processing units (ALU, FPU or others). But CPU

I've heard that (I'm not experts on this, so correct me if i am wrong) making SRAM is huge different than making processing units (ALU, FPU or others). But CPU needs both SRAM and processing units. Marking always show best case only, therefore the final product won't as good as the marketing numbers.