In just about every way. CPU caches are made from SRAM and live on the CPU itself. Main system RAM is made from DRAM and live on separate chips even if they are

In just about every way. CPU caches are made from SRAM and live on the CPU itself. Main system RAM is made from DRAM and live on separate chips even if they are soldered into the same physical package (system in package or SiP). The RAM still isn't on the SoC.