3.3 – Given a scenario, install RAM types

Question 1

What is the transfer rate of DDR4-2133?
❍ A. 17,066 MB/s
 ❍ B. 19,200 MB/s
 ❍ C. 21,333 MB/s
 ❍ D. 25,600 MB/s

Answer 1

A. The transfer rate of DDR4-2133 is 17,066 MB/s. It is also known as PC4-
17000. 19,200 MB/s is the speed of DDR4-2400 (PC4-19200). 21,333 MB/s is
the speed of DDR4-2666 (PC4-21333). 25,600 MB/s is the speed of DDR4-3200
(PC4-25600).

Question 2

How many pins are on a DDR3 memory module?
 ❍ A. 288
 ❍ B. 184
 ❍ C. 240
 ❍ D. 200

Answer 2

C. DDR3 is a 240-pin architecture. 288-pin is DDR4, 184-pin is the first version of
DDR (DDR1), and you can find 200-pin architectures in laptops; they are known
as SODIMMs. To review, Table 10.2 shows the pin configurations for PC-based
DDR1 through DDR4.

Question 3

Which of the following allows for a 256-bit-wide bus?
 ❍ A. ECC
 ❍ B. Quad-channel
 ❍ C. Parity
 ❍ D. DDR2

Answer 3

B. The quad-channel memory architecture can allow for a 256-bit-wide bus (64-bit
per channel). However, this will only be the case if all four channels have memory
installed to them. ECC stands for error correction code, which can detect and
correct errors in RAM. Parity is when the RAM stores an extra bit used for error
detection. DDR2 is a type of DRAM that, for the most part, was used in either
single-channel or dual-channel environments.