Lesson 5 Chapter 3 - RAM Overview Flashcards
What are packages?
Packages are the physical form factors
In 2000, desktop computers evolved from SIMM to what?
DIMM dual inline memory modules
What is a DIMM? What kind of RAM?
race mario kart
DIMM is a circuit board on which dynamic RAM integrated circuits are mounted in series.
DIMM is the dominant form factor for adding memory to… ? (3)
mine, jet, tray
- PCs
- Printers
- Servers
What are the 2 most used DIMM? What are they used in?
leet, 121
DIMM used in Desktop PCs and other large devices 133.35 mm
SODIMM used in laptop and other smaller, more portable devices 67.6 mm
RAM used in today’s PC has what 2 important characteristics?
dance routine, leonardo
- Synchronous
- Dynamic
[SDRAM]
What does synchronous mean?
kesha
Synchronous means synced with the system clock (timing clock of the motherboard)
What does dynamic mean? [As in SDRAM, DRAM, not SRAM]
Dynamic means RAM doesn’t permanently hold its contents
Are SRAM and DRAM volatile or non-volatile? Which has contents that rely on power?
SRAM - non-volatile, does not rely on power to hold content indefinitely
DRAM - volatile, its contents refresh every few milliseconds and rely on power
What is DDR memory?
i/o, single
Double Data Rate memory transfers data in and out at double the rate of Single Data Rate memory or SDRAM
What is the “two-bit prefetch” action? How often? Where is it transferred to and from?
In DDR, 2 bits are transferred in a single clock cycle from memory to an I/O register
What is the benefit of prefetching?
loading…loading, $, trees
Prefetching decreases transfer times by buffering/caching a resource (a set of bits) before it’s required
When was DDR memory introduced?
2000
What are 5 characteristics of DDR3?
eat, pin, dog double, 2-3tv, size
- Consumes 30% less power consumption, more efficient, faster
- Uses 240-pin DIMM
- Doubles the size of the prefetch buffers from 4 to 8 bits (bandwidth boost)
- DDR3 supports dual and triple-channel memory configurations
- DDR3 stick sizes range from 1GB to 8 GB
What are 3 characteristics of DDR4?
eat, pinup woman, size
- Consumes 20% less power consumption, more efficient, higher speeds
- It has 288-pin DIMM with a slight curve on both ends of the motherboard connector
- DDR4 DIMM sticks range from 4 GB to 64 GB sticks
What are 4 characteristics of DDR5?
year and compatible and tv, 2x music, pins, size
- Released in 2021, compatible multi-core architectures, improves channel efficiency power management and performance
- 2x bandwidth of DDR4 and 50% more speed
- 288-pins but not interchangeable
- DDR5 DIMM stick sizes range from 8 GB to 128 GB
What’s the max data rate for DDR3 (Gbps)?
data rate is doubled going forward DDR4, DDR5, etc
1.6 Gbps
What’s the max memory size for DDR3-5? (3)
- DDR3 8GB
- DDR4 32/64GB
- DDR5 128GB
What’s the number of connection pins for DDR3-5? (3)
DDR3 240
DDR4-5 288
How many prefetch bits for DDR3-5? (3)
doubles at some point
DDR3 8
DDR4 8
DDR5 16
What’s the bandwidth (Gbps) for DDR3-5?
DDR3 17
DDR4 25.6
DDR5 32
What is the voltage for DDR3-5? (3)
DDR3 1.3/1.5
DDR4 1.2
DDR5 1.1
Are there SODIMMS available for each of the DDR versions? T or F?
True
What are low-voltage versions of the DDR3 SODIMMs called?
message boards
DDR3L Modules
Are low-voltage and standard-voltage versions of DDR3 compatible?
No, not compatible
How many pins do DDR3-5 SODIMMs use? (3)
DDR3 SODIMM 204-pin module (low-voltage version available)
DDR4 SODIMM 260-pin module (slightly wider than DDR3 SODIMM)
DDR5 SODIMM 262-pin module (2 independent I/O channels for +bandwidth, standardized sideband bus)
What are multichannel memory configurations? What component uses it? What’s the benefit?
Multichannel configurations are used by the desktop/laptop motherboard to increase performance (when using memory)
What is a single-memory channel for which component? How much does it deliver?
DIMMs, with a 64-bit data bus, deliver 64-bits of data at a time with single-memory channels
How do you achieve triple-channel memory? What #-bit data bus does this achieve? How does this have to be installed?
You need 3 memory modules of 64 bits each to create the 192-bit total data bus
It has to be installed in series (on memory slots of the same color) to be used together
Each multiple-channel memory architecture requires….?
gaming
A memory controller that has support for its number of channels (dual channel memory controllers support 2 channels, etc)
Memory modules are ___ bit devices
64-bit devices
What does ECC RAM stand for?
Error Correction Code RAM
What does ECC RAM do? What does it use to do this?
ECC RAM uses special circuitry to detect and correct errors in data on the fly without interrupting the system
Where is ECC RAM commonly seen on?
ECC RAM is common on performance-enhanced workstations and servers
What is parity memory? What does it use to do this?
Parity memory is a simpler version of ECC RAM and uses a parity bit to check for errors (no correction)
What’s the difference between parity memory and ECC RAM?
only, not
Parity memory only finds the errors, doesn’t correct it
