Chapter 10: Memory Flashcards
True / False: Memory is expensive?
True
In relation of memory, Cache memory is?
Fast, costly, low capacity
In relation of memory, Disks are?
Slow, less expensive, high capacity
The main memory is?
A compromise between speed, price, and capacity
Virtualized machines require how much memory?
2GB
Three main memory technologies discussed?
- DDR
- DDR2 & DDR3
- Fully Buffered DIMMs
What is DRAM?
Dynamic Random Access Memory
What is SDRAM?
Synchronous Dynamic RAM
What is DIMM?
Dual Inline Memory Module
DRAM capacity is measured in?
Words
What DRAM words can be?
- 4 bits
- 8 bits
- 16 bits
Capacity of DIMM is the sum of what?
Capacities of the DRAM chips (minus ECC chips)
How much data does a “rank” provide?
64 bits
SDRAM is synchronous with what?
System Clock
Registered DIMMs have what?
A Buffer (register)
True / False: Registered DIMMs are faster than unbuffered DIMMs?
False.
Using RDIMMs allows for what three operations?
- Isolation of memory controller from DRAM
- Lighter electrical load
- More memory slots
DDR memory transmits data on what?
The rising and falling clock tick edge
DDR uses a pre-fetch of what size?
2 bits
DDR uses what voltages?
2.5 to 2.8 VDC
What is the DDR bus clock speed?
200MHz
DDR2 operates at what bus clock speeds?
400MHz, 800MHz, 1600MHz (future)
DDR2 operates at what voltage?
1.8 VDC
DDR DIMMs have how many pins?
184
