[Verification Submission]: Energy comsumption of RAM

[DanniBradu]

Contact Details

srrakhun@microsoft.com

Source?

Power consumption value for RAMS – DDR2, DDR3, DDR4.

Some references links below point to approx. 1-4 Watts for 4 GB -16 GB RAM https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwj6y4GZsvj2AhVCyzgGHduGC_IQFnoECAMQAw&url=https%3A%2F%2Fwww.tomshardware.com%2Freviews%2Fintel-core-i7-5960x-haswell-e-cpu%2C3918-13.html&usg=AOvVaw1G1i-G-RB59wKrHrhi-k7b

https://medium.com/teads-engineering/estimating-aws-ec2-instances-power-consumption-c9745e347959

Regarding memory consumption, we found some interesting data from DRAM manufacturers. Micron provides a calculator [7] and a power model [8] giving theoretical power consumption for each command for DDR4 memory systems. In their example, we can see a power consumption of ~0,41W/GB. In its official documentation, memory manufacturer Crucial [9] says that: “As a rule of thumb, however, you want to allocate around 3 watts of power for every 8GB of DDR3 or DDR4 memory”. Which equals to ~0,38W/GB.

Topic, Type and Category

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link to the way that the data was generated or some narrative

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[mrchrisadams]

Hi @DanniBradu , @srini1978 .

This is pretty close to the figures used by Cloud Carbon Footprint, (they even cite some of the same sources…).

I'm going to open this up internally for a second review, but it seems like a safe answer for now.

Memory#

Chosen Coefficient#

For the purpose of estimating energy consumption for memory, we are assuming hyper-scale cloud providers are utilizing the more efficient memory systems on the market: DDR4 or potentially DDR5. Two memory manufacturers have provided some information about the energy profile of DDR4 memory systems. Crucial says that “As a rule of thumb, however, you want to allocate around 3 watts of power for every 8GB of DDR3 or DDR4 memory,” which amounts to ~0.375 W/GB. Micron provides a power model that states “... each DRAM will consume approximately 408.3mW of total power,” which equals a power consumption of ~0.4083 W/GB. Given this information, we have decided to take the average of both these figures, and go with 0.392 W/GB, or 0.000392 kW/GB. In the application we have implemented this as 0.000392 Kilowatt Hour / Gigabyte Hour. We want to acknowledge that this is a complex subject with limited available data, and welcome additional research or studies to improve this coefficient.

Source: Methodology | Cloud Carbon Footprint

[da-ekchajzer]

Hello all,

Here is what we have at Boavizta

Usage emission

I think that Teads data are the best consumption profile for ram (as far as I know).

We plan to implement the usage impacts for ram into the API soon.

It will be possible to retrieve it :

• From the ram electrical consumption if known
• From the ram load (used as a proxy for electrical consumption). We plan to do some regression analysis based on component characteristics to infer consumption profiles (p(workload) = electrical_consumption)

feel free if you need clarification