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Comptia A+ 901 1.3a

RAM variations & troubleshooting

QuestionAnswer
Which is quicker two same RAM sticks one with CL7 and one with CL9? The CL7 is quicker because it delayed by less clock ticks than the other.
What does the acronym CAS stand for? Column Array Strobe is one of the wires that helps the MCC find a particular bit of memory.
A tech took a stick of RAM from an older PC and placed it in a newer PC. The DIMM's were a match but the PC would not boot up. Why? If the older PC had a system clock speed that was slower than the newer system clock speed. RAM may take one more tick of the clock cycle. Thus, a tech must go into BIOS and slow down the RAM timings.
Which type of RAM is needed to correct errors? ECC- error correcting code
Which type of RAM uses the last bit as either an even or odd checking system? Parity
What requirements are needed to use ECC RAM? Motherboard and chipsets must be compatible for ECC. Usually servers
What is buffered memory requirements? Mostly used on servers it has extra chips on it that act as a memory controller.
A tech used a DDR3 2400 non ECC buffered RAM stick on a users desktop to help with surfing the web. What was the result? The RAM would not work since most desktops will not have motherboards that are compatible with buffered RAM.
Where should a tech look to find which RAM to use? The motherboard manual.
A tech used placed two Kingston 256MB PC100 32x64 168Pin SDRAM sticks in a users PC. When the tech looked at the Task Manager it showed only one stick of RAM. What is the explanation? Dual channel SDRAM was not created until RAMBUS or DDR2. Therefore SDRAM does not allow for dual channel.
Which is a better option for a users desktop with these specs: 4 x DIMM, Max. 32GB, DDR3 2133(O.C.)1866/1600/1333/1066 MHz ECC, Non-ECC, Un-buffered Memory Dual Channel Memory Architecture. RAMBUS DRAM or DDR3 DRAM? DDR3 DRAM.
Which is a better option for a users desktop with these specs: 4 x DIMM, Max. 32GB, DDR3 2133(O.C.)1866/1600/1333/1066 MHz ECC, Non-ECC, Un-buffered Memory Dual Channel Memory Architecture. 1- 32 GB RAM sticks; 2- 32 GB RAM sticks; 2- 16GB RAM chips? 4- 8 GB RAM sticks
If a DDR RAM stick is labeled PC-4800 what is the speed rating? What is the clock speed? DDR-600, 4800/8= 600; 300 MHz-600/2= 300
What is the clock speed for this memory chip: DDR 1GB PC3200 ECC? (memory bus clock rate) x (bus clock multiplier) x (dual rate) x (number of bits transferred) x (bits per byte)= _x 1x2x64/8=3200; 200 MHz
If a DDR RAM stick is labeled PC-3500 what is the clock speed? 3500/16= 217 MHz
What is the clock speed for this memory chip: DDR2 1GB 6400 ECC DELL? 6400/32= 200 MHz
What is the "magic number" for DDR? x or / by 16
What is the formula for DDR2? (memory bus clock rate) x (bus clock multiplier) x (dual rate) x (number of bits transferred) x (bits per byte)= 1x2x2x64/8
What is the "magic number" for DDR? x or / 32
What is the speed rating for the following: DDR2 1GB 166 MHz? 166 x 2 x 2 x 64/8= 5300; PC2 5300
What is the clock speed for this memory chip: DDR3 1GB PC3-6400 ECC DELL? 100 MHz clock speed
What is the "magic number" for DDR3? x or / 64
What is the formula for DDR3? (memory bus clock rate) x (bus clock multiplier) x (dual rate) x (number of bits transferred) x (bits per byte)= 1x4x2x64/8
What is the recommended page-file size in Windows? 1.5 x amount of installed RAM.
A user complains when they open 5 programs that the hard drive light goes crazy and the PC slows down noticeably. What is going on? The pagefile system is having to access excess storage space causing disk thrashing.
What are Windows requirements for RAM in a 32 bit and 64 bit system? 32 bit= 1 GB ; 64 bit= 2 GB
What are Mac OS X requirements for RAM? 2 GB
What is the hot key combination for finding out RAM capacity? WINDOWS- PAUSE/BREAK KEY
Where can you find out RAM capacity? System Control Panel
Where can you adjust pagefile? System Control Panel, Advanced Settings, performance, advanced
What tool does Windows give you to find out your RAM performance? Performance Tab in the Task Manager
What is Ready Boost? It allows you to use flash media devices as super-fast, dedicated virtual memory.
A tech is trying to recommend to a client that they use Ready Boost but the client would rather just add more memory. Which will give better performance? Adding memory
A user has Windows Vista and already has one flash drive dedicated to Ready Boost. They try to add a second device, what will happen? It will not work because Vista can only have one Ready Boost- Windows 7 and later can have 8 flash devices for Ready Boost.
How do you turn on Ready Boost? Right click computer- Properties- Ready Boost- Dedicate this to Ready Boost
What size flash drive do you need for Ready Boost? 1-32 GB, but will usually get about 4 GB from drive.
Microsoft recommends how much RAM for Ready Boost? 1-3x the amount of the system RAM.
What does the acronym SPD stand for? Serial Presence Detect- It's a chip on the stick of RAM that tells the MCC all info about itself. On current machines all timings are determined based from this chip.
How do you repair a broken SPD? You have to buy a new stick of memory.
A users system places a parity error with an address on the screen. What would the next step be? A tech should write down the address to see if the same address occurs in future error codes. If so replace the RAM.
What is a page fault? An error message usually due to memory issues
What is a NMI? Non- maskable interrupt- BSOD or pinwheel of death
Windows 7 and later has what diagnostic tool to test RAM? Windows Memory Diagnostic
Created by: MelCrab