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RAM
Identify, explain, and install RAM!
30
Computer Science
Professional
05/10/2012

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Term
DRAM
Definition
Dynamic Random Access Memory
Term
SIMM
Definition
Single Incline Memory Module; essentially, a packaging type for 8 DRAM chips; max 32-bits
Term
FPM RAM
Definition
Fast Page Mode RAM; old, outdated RAM! It's a trap!
Term
SDRAM
Definition
Synchronous DRAM; DRAM that's tied to the system clock so it works synonymously with the MCC
Term
DIMM
Definition
Dual Inline Memory Module; alternate packaging type; 64-bits
Term
Bank
Definition
Slot where you put the RAM
Term
What five speeds were used on early SDRAM systems?
Definition
PC66, PC75, PC83, PC100, and PC133
Term
How can you tell what speed SDRAM you need for a system?
Definition
The speed of the SDRAM must surpass the speed of the frontside bus
Term
RDRAM
Definition
Rambus DRAM; handle speeds up to 800MHz; a stick is called RIMM; 184 and 160 pins for desktop and laptops
Term
Dual-Channel Architecture
Definition
RIMM is structured so data is pulled alternatively from each stick, so two sticks are required for the RAM to work
Term
CRIMM
Definition
Continuity RIMM; used to fill an empty RAM slot to allow RIMM to use properly
Term
DDR SDRAM
Definition
Double Data Rate SDRAM; two processes per clock cycle; 184 pin DIMMs, and match 168 pin DIMMs in size, but not pin compatibility
Term
What's the difference between DDR SDRAM DIMM with dual-channel architecture and RIMM?
Definition
RIMM requires two sticks, which requires CRIMM, while DDR SDRAM can function with a single stick
Term
DDR2
Definition
Same as DDR SDRAM, but clock-doubles the input-output circuits to add a 4-bit buffer similar to a cache
Term
DDR3
Definition
Doubles buffer to 8-bits, includes XMP that enables users to overclock the RAM easily
Term
XMP
Definition
Extended Memory Profile
Term
Double-sided RAM
Definition
Chips on both sides of the DIMMs; some motherboards can't handle double-sided RAM
Term
CL2/CL3
Definition
Clock Cycle 2/3; How many clock cycles DRAM takes before the MCC can ask for more code
Term
Latency
Definition
Time it takes for RAM to be able to send another line of code
Term
Parity RAM
Definition
Used to verify that data coming from the RAM is correct, but didn't always catch errors and couldn't repair errors.
Term
ECC RAM
Definition
Error correction code RAM; corrects errors as they occur; slower and more expensive than regular RAM; comes in all DIMM package types
Term
What is the average number of RAM DIMMs a motherboard can handle?
Definition
4
Term
Buffered/Registered RAM
Definition
RAM with intermediary buffering chips to allow for more than 4 sticks of RAM
Term
What are two symptoms that a computer may need more RAM?
Definition
General system sluggishness and excessive hard drive accessing
Term
Disk Thrashing
Definition
Excessive accessing of the HD
Term
Can you put DRAM that is faster than the motherboard requires in a PC?
Definition
Yes, but it will not operate faster
Term
Can you put sticks of multiple speeds in a PC?
Definition
Yes, as long as both are ≥ the required speed by the motherboard and the motherboard doesn't use dual channel
Term
SPD
Definition
Serial Presence Detect; chip on the DIMM or RIMM that contains all the information about the DRAM installed for the computer to read
Term
What does a memory error indicate?
Definition
They can indicate bad RAM, but sometimes they are completely random and unrelated to RAM
Term
NMI
Definition
Non-maskable interrupt; manifests as a Blue Screen of Death (BSoD)
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