* SDR SDRAM: Single Data Rate Synchronous Dynamic Random Access Memory
- introduced in year 1997
- Pins: 168
- Operating voltage: 3.3 V
- clock speeds are 66, 100, and 133 MHz (15, 10, and 7.5 ns/cycle)
- ECC, non-ECC
* DRDRAM: Direct Rambus Dynamic
Random Access Memory, or, RDRAM: Rambus DRAM
- The motherboards with support for RDRAM debuted in 1999
- Pins: 184
·
PC600:
16-bit, single channel RIMM, operate at 300 MHz clock speed, 1200 MB/s
bandwidth
·
PC700:
16-bit, single channel RIMM, operate at 355 MHz clock speed, 1420 MB/s
bandwidth
·
PC800:
16-bit, single channel RIMM, operate at 400 MHz clock speed, 1600 MB/s
bandwidth
·
PC1066
(RIMM 2100): 16-bit, single channel RIMM, 533 MHz clock speed, 2133 MB/s
bandwidth
·
PC1200
(RIMM 2400): 16-bit, single channel RIMM, 600 MHz clock speed, 2400 MB/s
bandwidth
·
RIMM
3200: 32-bit, dual channel RIMM, operate at 400 MHz clock speed, 3200 MB/s
bandwidth
·
RIMM
4200: 32-bit, dual channel RIMM, operate at 533 MHz clock speed, 4200 MB/s
bandwidth
·
RIMM
4800: 32-bit, dual channel RIMM, operate at 600 MHz clock speed, 4800 MB/s
bandwidth
·
RIMM
6400: 32-bit, dual channel RIMM, operate at 800 MHz clock speed, 6400 MB/s
bandwidth
* DDR SDRAM: Double Data Rate Synchronous Dynamic Random Access Memory
- introduced in year 2000
- Pins: 184
- Operating voltage: 2.5 V
- are not backwards compatible with SDR SDRAM
- ECC, non-ECC, Registered (Buffered), non-Registered (unbuffered)
|
Standard name (Chip Type) |
Module name |
Memory clock |
I/O Bus clock |
Data transfers Per second |
Peak transfer rate (Bandwidth) |
|
DDR-200 |
PC2-1600 |
100 MHz |
200 MHz |
200 Million |
1.600 GB/s |
|
DDR-266 |
PC2-2100 |
133 MHz |
266 MHz |
266 Million |
2.133 GB/s |
|
DDR-333 |
PC2-2700 |
166 MHz |
333 MHz |
333 Million |
2.667 GB/s |
|
DDR-400 |
PC2-3200 |
200 MHz |
400 MHz |
400 Million |
3.200 GB/s |
* DDR2 SDRAM: Double Data Rate Two Synchronous Dynamic Random Access Memory
- introduced in the second quarter of 2003
- Pins: 240
- Operating voltage: 1.8 V
- are not backwards compatible with DDR DIMMs
- ECC, non-ECC, Registered (Buffered), non-Registered (unbuffered)
|
Standard name (Chip Type) |
Module name |
Memory clock |
I/O Bus clock |
Data transfers Per second |
Peak transfer rate (Bandwidth) |
|
DDR2-400 |
PC2-3200 |
100 MHz |
200 MHz |
400 Million |
3.200 GB/s |
|
DDR2-533 |
PC2-4200 |
133 MHz |
266 MHz |
533 Million |
4.264 GB/s |
|
DDR2-667 |
PC2-5300 |
166 MHz |
333 MHz |
667 Million |
5.336 GB/s |
|
DDR2-800 |
PC2-6400 |
200 MHz |
400 MHz |
800 Million |
6.400 GB/s |
|
DDR2-1066 (planned) |
PC2-8500 (planned) |
266 MHz |
533 MHz |
1066 Million |
8.500 GB/s |
Note: DDR2-xxx (or DDR-xxx) denotes effective
clockspeed, whereas PC2-xxxx (or PC-xxxx) denotes theoretical bandwidth (though
it is often rounded up or down). Bandwidth is calculated by taking transfers
per second and multiplying by eight
* DDR3 SDRAM: Double Data Rate Three Synchronous Dynamic Random Access Memory
- announced in early 2005, while the specification is expected to be publicly available in mid-2007.
- Pins: 240
- Operating voltage: 1.5 V
- are not backwards compatible with DDR2 DIMMs
|
Standard name (Chip Type) |
Module name |
Memory clock |
I/O Bus clock |
Data transfers per second |
Peak transfer rate (Bandwidth) |
|
DDR3-800 |
PC3-6400 |
100 MHz |
400 MHz |
800 Million |
6.40 GB/s |
|
DDR3-1066 |
PC3-8500 |
133 MHz |
533 MHz |
1066 Million |
8.53 GB/s |
|
DDR3-1333 |
PC3-10600 |
166 MHz |
667 MHz |
1333 Million |
10.67 GB/s |
|
DDR3-1600 |
PC3-12800 |
200 MHz |
800 MHz |
1600 Million |
12.80 GB/s |