memory
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Memory
Wikipedia about DD4 SDRAM
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 |
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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memory.txt · Last modified: 03-06-2021 14:53 by wim