REVIEWING THE BASICS - CHAPTER 7

1.	How many pins are on a DDR3 DIMM? DDR2 DIMM?

 Both have 240

2.	How many pins are on a DDR DIMM? SDRAM DIMM?

 184

3.	How many notches does a DDR 3 DIMM have?

 1

4.	Which two metals might be used for the edge connectors of memory modules and memory slots they install in?

 copper, gold

5.	What was the first type of DIMM that ran synchronized with the system clock?

 SDRAM

6.	What major improvement did DDR make over regular SDRAM?

 Faster x2

7.	When a DIMM has chips on both sides of the module, do the pins on one side of the module work independently or dependent to pins on the other side of the module?

 Independently

8.	What prevents a DDR DIMM from being installed in a DDR2 DIMM slot on a motherboard?

 Notches

9.	Which module, a DDR3 or DDR2 DIMM, uses lower voltage?

 DDR2

10.	In a memory ad for DIMMs, you notice 64Meg √ó72 for one DIMM and 64Meg √ó64 for another DIMM. What does the 72 tell you about the first DIMM?

 72 shows the data path width of the DIMM listed in the ad. The 64 indicates the DIMM is non-ECC, and the 72 for the other DIMMs indicates ECC memory.



11.	A DIMM that contains memory chips in two memory banks on the module is said to be ______.

 Dual Ranked

12.	Generally, which DIMM gives better performance, a single-ranked DIMM or a dual-ranked DIMM?

 Dual ranked DIMM

13.	What type of DIMM supports triple channeling?

 DDR3

14.	What is the speed rating in MHz for a DIMM that has a PC rating of PC2-6400? What type of DIMM is assigned a PC2 rating?

 800 Mhz

15.	If two bits of a byte are in error when the byte is read from ECC memory, can ECC detect the error? Can it fix the error?

 Yes. No.

16.	When parity memory detects an error, what happens?

 The system halts

17.	How many notches are on an SDRAM DIMM?

 168

18.	Looking at an SDRAM DIMM, how can you know for certain the voltage needed by the module?

 3.3 V

19.	A DIMM memory ad displays 5-5-5-15. What is the CAS Latency value of this DIMM?

  5

20.	What is the most amount of RAM that can be used by a 32-bit installation of Windows XP Professional?

 4GB

21.	A motherboard uses dual channeling, but you have four DIMMs available that differ in size. The motherboard supports all four sizes. Can you install these DIMMs on the board? Will dual channeling be enabled?

 Yes. No.

22.	What is the purpose of the memory technology called SPD?

 SPD declares to system BIOS at startup the module�s size, speed, voltage, and data path width.



23.	 You need to upgrade memory on a motherboard that uses RIMMs. You notice one RIMM and one C-RIMM module are already installed on the board. Which module should you replace?

 C-RIMM

24.	What types of memory can be used on a 100-MHz motherboard?

 PC800

25.	How many 30-pin SIMMs are installed in one bank?

 We don’t need to know this.

26.	How many 72-pin SIMMs are installed in one bank?

 We don’t need to know this.


27.	Which is faster, CL3 memory or CL5 memory?

 CL5

28.	You are looking to purchase two DIMMs running at 400 MHz. You find DIMMs advertised at PC4000 and PC3200. Which do you purchase?


PC3200
29.	You need to find out how much RAM is installed in a system. What command do you enter in the Run dialog box to launch the System Information utility?



30.	Although ECC memory costs more than non-ECC memory, why would you choose to use it?

If you are doing very important calculations (like calculating pi)

Thinking Critically

1.	You need to upgrade memory in a system but you don’t have the motherboard documentation available. You open the case and notice that the board has four DIMM slots; three slots are colored yellow and one slot is black. What type of DIMM does the board likely use? How can you be sure?

 IDK

2.	If your motherboard supports DIMM memory, will RIMM memory still work on the board?

 No

3.	If your motherboard supports ECC SDRAM memory, can you substitute non-ECC SDRAM memory? If your motherboard supports buffered SDRAM memory, can you substitute unbuffered SDRAM modules?

 Yes. No.

4.	You have just upgraded memory on a computer from 256 MB to 512 MB by adding one DIMM. When you first turn on the PC, the memory count shows only 256 MB. Which of the following is most likely the source of the problem? What can you do to fix it?


a.	Windows is giving an error because it likely became corrupted while the PC was disassembled.

b.	The new DIMM you installed is faulty.

c.	The new DIMM is not properly seated.

d.	The DIMM is installed in the wrong slot.



5.	Your motherboard supports dual channeling and you currently have two slots used in Channel A on the board. You want to install an additional 512MB of RAM. Will your system run faster if you install two 256 MB DIMMs or one 512 MB DIMM? Explain your answer.

Two 256 MB because they dual channel.