Memory Systems

CHAPTER 7

Overview of DRAMs

DRAM is the “computer memory” that you order through the mail or purchase at the store. It is what you put more of into your computer as an upgrade to improve the computer’s performance. It appears in most computers in the form shown in Figure 7.1—the ubiquitous memory module, a small computer board (a printed circuit board, or PCB) that has a handful of chips attached to it. The eight black rectangles on the pictured module are the DRAM chips: plastic packages, each of which encloses a DRAM die (a very thin, fragile piece of silicon).

FIGURE 7.1 A memory module. A memory module, or DIMM (dual in-line memory module), ...