Table of Contents
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Memory
SDRAM
Synchronous Dynamic Random Access Memory
Wikipedia
DDR General
DDR / DDR-1
Wikipedia
2,5V / 2,6V
- DDR-200 (PC-1600, 2,5V)
- DDR-266 (PC-2100, 2,5V)
- DDR-333 (PC-2700, 2,5V)
- DDR-400 (PC-3200, 2,6V)
Examples of confusing partnumbers:
- DDR-266: Kingston KTD4400/512; 512MB DDR 266MT/s Non-ECC Unbuffered DIMM CL2.5 2.5V 184-pin 400mil
- DDR-400: Kingston KTD8300/1G; 1GB DDR 400MT/s Non-ECC Unbuffered DIMM CL3 2.6V 184-pin 400mil
DDR-2
Wikipedia
1,8V
- DDR2-400 (PC2-3200)
- DDR2-533 (PC2-4200)
- DDR2-667 (PC2-5300)
- DDR2-800 (PC2-6400)
- DDR2-1066 (PC2-8500)
DDR-3
Wikipedia
1,5V / 1,35V
- DDR3-800 (PC3-6400)
- DDR3-1066 (PC3-8500)
- DDR3-1333 (PC3-10600)
- DDR3-1600 (PC3-12800)
- DDR3-1866 (PC3-14900)
- DDR3-2133 (PC3-17000)
DDR-4
Wikipedia about DDR4 SDRAM
1,2V / 1,05V
- DDR4-1600 (PC4-12800)
- DDR4-1866 (PC4-14900)
- DDR4-2133 (PC4-17000)
- DDR4-2400 (PC4-19200)
- DDR4-2666 (PC4-21300)
- DDR4-2933 (PC4-23466)
- DDR4-3200 (PC4-25600)
Example speed indication for a DDR4-2666 module
MB/s: MegaBytes per second
MT/s: MegaTransfers per second
| Name | Value |
|---|---|
| Standard name | DDR4-2666 |
| Module name | PC4-21333 |
| Memory clock | 333 MHz |
| I/O bus clock | 1333 MHz |
| Data rate (MT/s) | 2666 |
| Peak transfer rate (MB/s) | 21333 |
DDR-5
Wikipedia
1,1 V
- DDR5-4000 (PC5-32000)
- DDR5-4400 (PC5-35200)
- DDR5-4800 (PC5-38400)
- DDR5-5200 (PC5-41600)
- DDR5-5600 (PC5-44800)
- DDR5-6000 (PC5-48000)
- DDR5-6200 (PC5-49600)
- DDR5-6400 (PC5-51200)
- DDR5-6800 (PC5-54400)
- DDR5-7200 (PC5-57600)
- DDR5-7600 (PC5-60800)
- DDR5-8000 (PC5-64000)
- DDR5-8200 (PC5-65600)
- DDR5-8400 (PC5-67200)
- DDR5-8800 (PC5-70400)
Mixing memory
- Not all memory can be mixed even if it has the same speed
- Be aware that it is possible that the memory controller can only make one setting which will be valid for al slots
- Make sure the ranking is the same
- Make sure the brand of the used chips all the DIMM's is the same
- Make sure the production date is the same
- Conclusion: Buy the DIMM's as a set otherwise chances are great your computer will not start up, not even in BIOS or UEFI
- Single and double rank
- Single rank DIMM: 1Rx4 or 1Rx8 on the DIMM module label
- Double rank DIMM: 2Rx4 or 2Rx8 on the DIMM module label
- JDEC / SPD and XMP profiles
- Single channel (any number of DIMM installed) and dual channel (even number off DIMM's installed)
- 1,2V and 1,35V. Warning: Watch out when using 1,2V memory at 1,35V. You might damage the memory
Tools
Tools to read the SPD memory on the DIMM's
i2c-tools contains
- i2cdetect
- i2cbusses ?
- i2cdump
- i2cget
- i2cset
- i2ctransfer
- i2c-stub-from-dump
ASrock motherboards
On newer ASrock motherboards you can see the memory settings in the UEFI tab “OC Tweaker” under “DRAM Information”
Useful links
DDR4 memory information in Linux
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