Module Thirteen Flashcards
What is system memory?
RAM. The main storage area for programs and data when the computer is running.
What does DRAM stand for?
Dynamic Random Access Memory
What is System Ram?
DRAM
How does DRAM work?
It stores each data bit as an electrical charge within a single ‘bit cell’. The electrical charge dissipates and the memory is lost if there is no power to refresh the cell.
What does SDRAM stand for?
Synchronous DRAM
What does synchronous mean?
Existing or occurring at the same time.
What does DIMM stand for?
Dual Inline Memory Module
What does SO-DIMM stand for?
Small Outline Dual Inline Memory Module
What is SDRAM synchronized to?
The system bus.
How many bits of bus data does SDRAM have?
64-bits
What does it mean to have a 64-bit data bus?
It means that in each clock cycle, 64 bits of information can be delivered to the CPU.
What does DDR SDRAM stand for?
Double Data Rate Synchronized Dynamic Random Access Memory.
DDR SDRAM can also be referred to as just what?
DDR
DDR SDRAM has a feature called “double pumped”. What does “double pumped” mean?
SDRAM has for instance a 64-bit clock cycle. How a clock cycle works it, there is a low and high state. In each clock cycle 64 bits of information are processed.
With DDR SDRAM there is 64 bits processed in the low state of a clock cycle and 64 bits processed in the high state of the clock cycle. Doubling the amount of data processed per clock cycle.
What would the maximum data rate be for 64-bit DDR SDRAM if the bus speed is 100MHz? Answer in MBps. Explain your answer.
1600MBps 64 bits (low state) + 64 bits (high state) * 100/8.
How did DDR2, DDR3, and DDR4 increase bandwidth? And what’s the drawback?
By increasing bus speeds instead of the speed of the actual memory chips. Latency is the drawback.
What type of packaging do DDR2, DDR3, and DDR4 use?
DIMM and SO-DIMM
Can I use DDR3 modules with DDR4 motherboard?
No, the form factors of the edge connectors are different.
HDD (Hard Disk Drives) are made up of what three things?
- They’re encoded magnetically.
- They’re encoded magnetically on coated glass or plastic platters.
- Those platters are accessed by “drive heads”.
What are the two formats for HDDs?
- Desktop 3.5”
- Laptop and external hard drives 2.5”
What is the memory capacity range of HDDs?
100GB-10TB
What does RPM stand for?
Revolutions Per Minute
How fast can high performance HDDs go?
15000 RPM
How fast can budget to midrange HDDs go?
5400-7200 RPM
