Imagine if there is a problem (read or write errors) in the blue box. The CPU is very likely to generate an invalid instruction fault. This fault will cause your software or Operating System to crash or reboot.
In Windows you’d see the Blue Screen Of Death:
In Linux you will get a Kernel OOP.
Linux is slightly different from Windows because there are two types of OOPs. One that behaves like Windows that will halt the entire system, requiring a computer reboot. There is a second type of OOPS that will reset only the CPU, leaving everything else to tick normally like nothing has gone wrong.
Again let me stress 99% of the time, these crashes are bad software and not bad RAM.