RAM Power Consumption

[Trenta Zeloso]

Hi everyone,
I am new to the forum. I was wondering if any of you have ever tried to estimate power absorbed by RAM modules. This would obviously depend on multiple variables so I believe JEDEC should have set some standards defining the specific conditions to be met to calculate it. In this way different models and manufacturers can be effectively compared. I know that Micron has made available a Power Calculator template on their website for each RAM generations that can be downloaded and used for free. So if one has the datasheet for a specific model and brand, they should be able to extract some info as defined in JEDEC standards and fill out Micron's template and this would then give the power estimated for that RAM. Is anyone familiar with this? This method is pretty popular in literature, although it is a model and as such comes with inherent limitations.
Thanks a lot,
TZ

 

[unwind-protect]

I once measured power for the whole computer with more and less RAM sticks.

Let me see whether I can dig up my notes.

 

[CyklonDX]

ddr4 its 3-5W @ 1.2V per stick
ddr5 its 5-10W @ up to 1.1V per stick

lpddr sticks typically 2-4W less

sticks can take more or less depending on system configuration.
Most often each channel availability to the cpu causes more wattage on them; doing heavy workload, populating them fully might also go further up.

 

[gregsachs]

Optane DCPMMM is rated at 15-18w per stick.

 

[Trenta Zeloso]

Thanks all for your feedbacks. @CyklonDX, these are more or less values I can find on the Internet I presume. I would need something more "traceable", in the sense that I would like to prove that the values I obtained have been derived following a reliable and established procedure. Is there any chance that any of you guys can read a datasheet and interprete Micron's power calculator template? I spent a few hours on them but its definitely too technical for my level of knowledge of electronics.

 

[CyklonDX]

look at voltage, and mA the chips on the sticks are taking.
(mA * V) / 1000 = Watts

 

[Trenta Zeloso]

The problem is that the data sheets provide a bunch of different currents so the question is which one to take. Usually they are named with I_DD and then something else. Also, I'm not familiar with electronics principles, but there are a bunch of pins and each of them can have different current flows, I presume?

 

[CyklonDX]

take the total highest, and lowest; but this is normal for almost all components.

 

[kapone]

Why is RAM power consumption important??

 

[nabsltd]

Why is RAM power consumption important??

Because it's the only way to satisfy this AI chatbot's needs?

Seriously, guys, these weirdly theoretical first posts should be a dead giveaway that it's an AI chatbot.

From now on, only feed them back garbage...don't post as if a human who really wants to solve a problem.