Question

What are the limitations of internal memory?

Answer 1

As I understand it, something like an ALU would have a latch to keep the input data on the internal wiring / data paths until the next clock cycle. There are latches between every pipeline stage which accept new data on every clock cycle (assuming fully-pipelined ALUs, e.g. one-per-clock throughput with multi-cycle latency.) So the data isn't stored in any kind of "memory", other than the latches between pipeline stages. Mostly it's just live in the logic gates.

Answer 2

The limitation of internal memory are:-

1-Limitated capacity

2-Tempory in natural