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I dont have perfect apples to apples comparisons but I can paint you a pretty good picture. Idle active power consumption is mostly determined by the controller

I dont have perfect apples to apples comparisons but I can paint you a pretty good picture. Idle active power consumption is mostly determined by the controller and the amount of RAM on the device. read and write energy costs are very difficult to determine (for someone not working at samsung) First of all, almost all old ssd's beat new ones in power consumption. which makes sense as the controller needs more energy to read smaller and smaller tlc nand. especially the move to NVME drives. You can see that here https://www.anandtech.com/show/9702/samsung-950-pro-ssd-review-256gb-512gb/10 https://www.anandtech.com/show/9702/samsung-950-pro-ssd-revi... The idle power draw is also specified in the spec sheet. Its why I didn't bother with data. The evo drives dont have as much ram and a more forgiving controller. they are along the 0.5w lines I think So just how do these drives compare to hdd? and how do they consume power on everyday tasks? I dont have any articles of modern mobile hdd's because they kinda went out of style. But one article gives you the best case scenario https://www.tomshardware.com/reviews/ssd-hard-drive,1968-10.html https://www.tomshardware.com/reviews/ssd-hard-drive,1968-10.... Old, low capacity, sata flash drives. They are the most power efficient devices. Hopefully anantech or tom's hardware will retest NVME drives in laptops to hit the final nail in the coffin for nvme ssd power consumption compared to disks.

ksec 7y ago
Sigh. This is HN, not Anandtech, there are people here design SSD Controller and Firmware for a living. >The idle power draw is also specified in the spec sheet. Its why I didn't bother with data. Which is why you should check. I should also remind you Laptop SSD are tuned with energy usage in mind rather than performance. A modern 970 EVO desktop NVMe drives idle at 0.03w. You are off by a factor of 10. The same drives has a deep idle state of 0.005W. Your idle Power is off by 100x. Let's Assume a Laptop HDD has a similar idle and standby power. ( Which they dont ) The same drive compared to HDD has a Seq Red 10x and Random Read of 1000x to 100,000x. Let pick a middle of the pack number as 100x. Even if Active power of SSD were double of the HDD ( Which they dont ). In Mix workload SSD is faster than HDD by 20x, SSD would have saved 10x energy. >NVME drives in laptops to hit the final nail in the coffin for nvme ssd power consumption compared to disks. There is nothing final nails in the coffin. The difference is so drastic, and there is a reason why every laptop manufacturer jumped to SSD. Not because it was cheaper, but it saves huge amount of energy hence battery.

ksec 7y ago

Sigh. This is HN, not Anandtech, there are people here design SSD Controller and Firmware for a living. >The idle power draw is also specified in the spec sheet. Its why I didn't bother with data. Which is why you should check. I should also remind you Laptop SSD are tuned with energy usage in mind rather than performance. A modern 970 EVO desktop NVMe drives idle at 0.03w. You are off by a factor of 10. The same drives has a deep idle state of 0.005W. Your idle Power is off by 100x. Let's Assume a Laptop HDD has a similar idle and standby power. ( Which they dont ) The same drive compared to HDD has a Seq Red 10x and Random Read of 1000x to 100,000x. Let pick a middle of the pack number as 100x. Even if Active power of SSD were double of the HDD ( Which they dont ). In Mix workload SSD is faster than HDD by 20x, SSD would have saved 10x energy. >NVME drives in laptops to hit the final nail in the coffin for nvme ssd power consumption compared to disks. There is nothing final nails in the coffin. The difference is so drastic, and there is a reason why every laptop manufacturer jumped to SSD. Not because it was cheaper, but it saves huge amount of energy hence battery.