Memory Flashcards
Why is DDR2 Ram faster than DDR Ram?
The input/output speed is faster.
What is dual channel memory?
It describes motherboard technology that doubles data throughput from Ram to the MCC.
Installed in pairs or trios for maximum data throughput.
How do you utilize Ram that uses Dual-Channel-Architecture?
Dual-Channel DDR requires two identical sticks of DDR, and they must snap into two paired slots.
What is buffered RAM?
Ram with small registers installed on memory that acts as a buffer between the DIMM and the MCC
What’s ECC?
It’s RAM that fixes errors as they occur. Slower than non-ECC
Why is SDRAM better than DRAM?
It is synchronized with the system bus.
What is PROM?
Programmable read only memory.
Written once, cannot be changed.
What is EPROM?
Erasable PROM
Can be erased and re-used.
What is EEPROM?
Electrically Erasable PROM (Flash memory, SSD)
What is the CMOS?
A separate memory chip that stores the BIOS settings
Kept charge by the CMOS battery.
What is Firmware?
Firmware is a software program or set of instructions programmed on a hardware device. It provides the necessary instructions for how the device communicates with the other computer hardware
Firmware is typically stored in the flash ROM of a hardware device.
What is Flash Memory?
Memory that retains data in absence of a power supply.
What is the system ROM?
It’s Flash ROM (ROM you can update), it enables your CPU to talk to basic hardware of your PC. It holds the BIOS for HDD’s, Display Devices, USB, etc..
What is ROM?
Read Only Memory.
It stores programs for your CPU to communicate with hardware.
Can’t be changed or erased.
What is DRAM?
Dynamic Random Access Memory.
It’s used as the main system memory. It is VOLATILE MEMORY that needs a constant refresh or it loses it’s data.
- Slower than SRAM
- Less expensive
- Used as primary storage (RAM, DIMM’s)
What is SRAM?
Static RAM.
VOLATILE
Very fast and very expensive.
Used often in CPU caches (L1, L2, L3)
What’s “Flashing the ROM”?
Upgrading your BIOS to support new technology.
How many levels of cache are there? What do they do?
- 3 levels.
- Level 1- Fastest cache. Integrated on or close to the CPU
Level 2- Secondary data.
Level 3- Data shared across multiple cores.
What is Virtual Memory? What is it’s size?
Computers use a portion of the Hard Drive as an extension of the RAM called a page-file.
It is 1.5 times the amount of RAM you have installed.
What is RAM?
Random Access Memory
It is physical hardware in a computer that temporarily stores data. It is volatile memory.
It transfers and stores data to and from the CPU
What is cache? What kind of RAM is it?
Smaller memory stored on the CPU.
It is Static Random Access Memory (SRAM). Very fast memory.
What is Parity?
Ram that detects errors but does not fix them real time. Adds an additional parity bit.
What is the term for the delay in the RAM’s response to a request from the MCC?
Latency.
Which of the memory types listed below are designed to store permanent data that cannot be changed?
- RAM
- EPROM
- ROM
- PROM
- EEPROM
PROM
ROM
What type of memory is flash memory?
EEPROM electrically erasable programmable read-only memory
What is VRAM?
A special-purpose memory type used by graphics controllers.
What is the type of media used as a secondary system storage in tablets and mobile phones?
eMMC
