| RAM | ROM |
|---|---|
| RAM stands for Random Access Memory. | ROM stands for Read Only Memory. |
| In RAM data can be read/write at any time during the operation of system. | In ROM data can be read only. One cannot write in ROM after the chip is ready to use. |
| It is a volatile memory i.e. its contents are lost when the device is powered off. | It is a non-volatile memory i.e. its contents are retained even when the device is powered off. |
| Its accessing speed is faster. | Its accessing speed is slower. |
| The price of RAM is comparatively high. | The price of ROM is comparatively low. |
| The size of RAM chip is larger than ROM chip. | The size of ROM chip is smaller than RAM chip. |
| Types of RAM are Static RAM (S-RAM) and Dynamic RAM (D-RAM). | Types of ROM are Programmable Read Only Memory (PROM), Erasable Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM) etc. |
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