Ddr5 temperatures

sgoaty

sgoaty

sgoaty

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Interesting video if you have the time.


I've been messing with an intel system recently with less than ideal airflow. I was looking to get the RAM to run a bit faster as it's M die so should be capable of more than the 5600 cl40 it's rated to. I was lazy and used the memory try it on the motherboard and it was memtest stable at 6000 cl36 I ran prime and heaven simultaneously for a few hours and the system locked up. I restarted and ran it again straight away and noticed the RAM was up to 66c it locked up again almost immediately. I rigged a fan over the ram and tried it again. I had over 12 hours stable and RAM temp peaked at 47c.

I haven't really given RAM temperatures much thought before now. Those RAM coolers are looking quite appealing but it's annoying having fancy RGB ram then covering it up with ugly fans.
 
RAM is pretty heat tolerant at JEDEC specs/timings but gradually gets more sensitive the higher/tighter you go. If you have your tREFI maxed out for example then you'll find that you need to keep them ~50c and under to be stable.

I don't think you're at risk of actually damaging them, though.
 
ATIorNvidia said:
RAM is pretty heat tolerant at JEDEC specs/timings but gradually gets more sensitive the higher/tighter you go. If you have your tREFI maxed out for example then you'll find that you need to keep them ~50c and under to be stable.

I don't think you're at risk of actually damaging them, though.
Click to expand...

The heating issue effects the other chips that are now on DDR5, not the RAM chips as much.


DDR5 DIMMs feature two key new controllers/ICs directly on the module, rather than on the motherboard as in previous generations:

  • PMIC (Power Management Integrated Circuit): This is the main "controller" for power. It manages the voltage regulation (converting 5V to 1.1V VDD) directly on the DIMM, resulting in cleaner power and higher energy efficiency.
  • SPD Hub (Serial Presence Detect Hub): This chip manages the interface, identification, and temperature reporting of the module.
Other specialized chips on specific DDR5 types:
  • CKD (Client Clock Driver): Found on CUDIMMs (Clocked Unbuffered DIMMs) and CSODIMMs (laptop version), this chip improves signal integrity to allow for much higher frequencies.
  • RCD (Registering Clock Driver): Found on RDIMMs (Server/Workstation memory) to stabilize the system and allow for larger memory configurations.
  • On-die ECC: While not a "controller" chip, all DDR5 chips have this built-in capability to correct bit errors within the DRAM chip itself
 
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