RISC is another CPU instruction set. RISC operates on fewer and smaller functions but processes them very quickly. Only applications written for the RISC instruction set can take advantage of this feature. Megahertz is the number of cycles per second. Clock doubling or tripling technology speeds up the processor by increasing the clock speed internal to the chip.
RAM is random access memory.
RAM is erased every time the system is turned off. ROM is read-only memory. This memory is used for the long-term storage of programs and data as firmware on a chip. DRAM is cheaper and more often used as base, or main, memory. SRAM is static RAM and does not have to be refreshed almost continuously.