Processing and Memory - Strata Study Guide - page 29

14. B. Virtual memory, also called a swap fi le, consists of a hard disk fi le that is used to hold
data that is swapped out of RAM temporarily until it is needed again and swapped back in.
SRAM, DRAM, and ROM are all physical types of memory.
15. C. SDRAM is synchronous dynamic random access memory. Synchronous refers to the
synchronization of its speed with that of the front-side bus. Do not confuse this with
SRAM (static RAM) or SDR (single data rate).
16. C. If SDR is the baseline, then DDR (also known as DDR1) is 2x the speed, DDR2 is 4x the
speed, and DDR3 is 8x the speed.
17. A. Small-outline DIMM (SODIMM) is typically used in notebook PCs. There is no such
thing as SODRAM. Regular DIMMs are typically used in desktop PCs. ROM
is not a type of RAM; it's read-only memory.
18. B. According to Table 1.2, a 184-pin DIMM is a double data rate (DDR) DIMM.
19. D. A deeper prefetch buffer is the primary reason why DDR3 is faster than DDR2 RAM.
A BIOS chip is ROM. The L1 and L2 caches are on the processor, not on the RAM.
20. B. Synchronous RAM is synchronized with the system bus speed, which is in turn
controlled by the motherboard's system timer.