DRAM

What is the main effect of running PC memory in dual-channel mode?

  1. ATwo memory channels are used simultaneously, roughly doubling peak bandwidth
  2. BThe memory latency is halved
  3. CThe memory capacity doubles
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Answer: A. Two memory channels are used simultaneously, roughly doubling peak bandwidth

In dual-channel mode, the memory controller transfers data over two independent channels at the same time, roughly doubling peak bandwidth. Capacity is set by the total of the modules and is independent of the number of channels. Latency hardly changes.

  • A. Correct. Two channels in parallel roughly double the bandwidth.
  • B. The latency of a single access hardly changes.
  • C. Capacity is the total of the installed modules and is not doubled by channels.
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More DRAM questions

  1. Which correctly describes a "rank" on a DRAM module?
  2. How many 8-bit-wide (x8) DRAM chips are needed per rank to form a 64-bit data bus (without ECC)?
  3. In most current PC processors, where is the memory controller that controls DRAM located?
  4. What is commonly required by DRAM standards when the chip temperature is in the high range (for example, above 85 °C)?
  5. As DRAM capacity grows, what tends to become a problem with respect to refresh?