(i). It is much slower than SRAM & is not able to keep pace with the Main Processor.
(ii). It requires refreshing in order to retain the information in its memory cells.
The charge stored in the capacitor of a DRAM leaks & most of the charge cannot be retained for long or may be lost within a few milliseconds. To preserve the information, the charge must be refreshed every 1 or 2 milliseconds by use of a Refresh circuit, which can be incorporated within the CPU.
Kavungya answered the question on April 2, 2019 at 08:23
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