Ch7 Upgrading Memory - Reviewing the Basics

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

Both use 240-pins

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

184
168

How many notches does a DDR 3 DIMM have?

1 offset notch

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

Tin and gold

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

SDRAM - Synchronized Dynamic Random Access Memory

What major improvement did DDR make over regular SDRAM?

Runs twice as fast and has 184 pins. Processes data when the beat rises and again when the beat falls

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

Independently

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

Offset Notch

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

DDR3

In a memory ad for DIMMs, you notice 64Meg x72 for one DIMM and 64Meg x64 for another DIMM. What does the 72 tell you about the first DIMM?

Data path width

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

Dual Ranked

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

Single-ranked DIMMs cost more but perform better because the controller accesses all chips at the same time.

What type of DIMM supports triple channeling?

DDR3

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?

6400
DDR2

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

When parity memory detects an error, what happens?

If the number of bits is not an odd number for odd parity or an even number for even parity, a parity error occurs.

How many notches are on an SDRAM DIMM?

2 Notches

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

Two notches on SDRAM DIMMs are positioned to identify the technologies that the module supports.

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

The first value

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

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

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. To support Dual Channeling you must install matching DIMMs in each channel.

What is the purpose of the memory technology called SPD?

Serial Presence Detect (SPD) is a DIMM technology that declares to system BIOS at startup the module's size, speed, voltage, and data path width. If the DIMM does not support SPD, the system might not boot or boot with errors. Today's memory always supports SPD.

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 - Continuity Random Inline Memory Module

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

SDRAM

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

4

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

2

Which is faster, CL3 memory or CL5 memory?

CL3
CAS Latency (CL) and RAS Latency (RL) measure access time to memory. The lower values are faster than the higher values.

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

8 Byte (64-bit) data path X 400mHz = 3200 = PC3200
Or 64-bit data path X 400MHz = 25600 ÷ 8 Bytes = 3200 = PC3200

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

MSinfo32

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

The memory controller can check memory for errors and possibly correct those errors using ECC

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