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Current drawn by SSDs & HDDs
I have molex connectors to SSDs & HDDs
Is the amount of current drawn by SSDs less than the HDDs, given these's no platters to spin? Where can I find the current drawn by these devices in real time; is this in windows or some 3rd party software? What is the max current drawn by SSDs & HDDs and does this vary with the data transfer rate? Peter |
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Current drawn by SSDs & HDDs
Peter Jason wrote:
I have molex connectors to SSDs & HDDs Is the amount of current drawn by SSDs less than the HDDs, given these's no platters to spin? Where can I find the current drawn by these devices in real time; is this in windows or some 3rd party software? What is the max current drawn by SSDs & HDDs and does this vary with the data transfer rate? Peter Buy yourself a clamp-on DC ammeter. The jaws can be placed around the yellow 12V wire (motor power) on a 3.5" hard drive. On an SSD, you'd put the clamp-on ammeter around the red +5V wire. Details on the wires can be found here. Compare your "properly colored" wiring computer, to your "all black ribbon" power supplies, to figure out where to make measurements on newer systems. http://www.playtool.com/pages/psucon...onnectors.html The manufacturer provides some information on power consumption, but it isn't always the information you want. Hard drives usually have reasonable specs. Sometimes the spin-up current is missing from 2.5" hard drives (that's around 5V @ 1A or so and makes it hard to run off a USB 5V 0.5A port). NVMe drives are going to be hard to measure, as there are no exposed wires. You would need a PCI Express carrier card, one with breakouts for power, to make a measurement. An NVMe drive is apparently always going to be more than 5W consumption. Sure, the power consumption has a proportionality to write speed, but I don't have a read-made table showing any quirks. It should be linear with bandwidth, but who really knows. If your NVMe drew 5W at 2GB/sec, you could use linear interpolation between 5W and maybe half a watt when it's idle or something. My SATA SSDs here generally fit within the USB2 footprint of 5V @ 0.5A. One I tested the other day was maybe 0.3A or 0.35A during sustained write. Drives with Sandforce chips draw up to 7W peak. Intel Optane is pretty hard on electricity. It should be higher than regular flash. A clamp-on DC ammeter is fine, as long as there is a power cable you can make the measurement on. (You must be able to gain access to an individual wire - slapping the meter around the whole cable, the magnetic field cancels out and the reading is 0.) Drives that plug into stuff with no exposed cables, that's going to be a chore to get at. A $20 Harbor Freight multimeter, requires wiring the ammeter portion in series with the load. Which is a prohibitive nuisance, and why I use a clamp-on DC ammeter. The clamp-on DC ammeter also allows measuring out-sized currents. For example, when the starter motor in my car had problems, the clamp-on DC ammeter "peak" reading feature, determined the starter was drawing 150 amps. My regular multimeter measured the battery terminals dipping to 9V (my multimeter has "peak" detection in both directions). The starter was getting 1350W while "stalled". I can measure anywhere from 10mA to 400A with it. Paul |
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Current drawn by SSDs & HDDs
On 18-6-2018 2:38, Peter Jason wrote:
I have molex connectors to SSDs & HDDs Is the amount of current drawn by SSDs less than the HDDs, given these's no platters to spin? Where can I find the current drawn by these devices in real time; is this in windows or some 3rd party software? What is the max current drawn by SSDs & HDDs and does this vary with the data transfer rate? Peter Cut a wire and put an amp meter there. Or produce a male/female molex pair with a connection for an amp meter between computer supply and disk. then measure current. There is no magical solution for what you want. A shunt capacitor across the amp meter might be a good idea. 1Uf cap should do it. |
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Current drawn by SSDs & HDDs
On 6/17/2018 5:38 PM, Peter Jason wrote:
I have molex connectors to SSDs & HDDs Is the amount of current drawn by SSDs less than the HDDs, given these's no platters to spin? Where can I find the current drawn by these devices in real time; is this in windows or some 3rd party software? What is the max current drawn by SSDs & HDDs and does this vary with the data transfer rate? Peter Found a few numbers: Do SSDs use more or less power than HDDs, and by how much? https://www.quora.com/Do-SSDs-use-mo...nd-by-how-much The Power Consumption vs Workload chart is interesting https://superuser.com/questions/5897...ion-ssd-vs-hdd |
#5
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Current drawn by SSDs & HDDs
On Sun, 17 Jun 2018 20:02:07 -0700, Mike S
wrote: On 6/17/2018 5:38 PM, Peter Jason wrote: I have molex connectors to SSDs & HDDs Is the amount of current drawn by SSDs less than the HDDs, given these's no platters to spin? Where can I find the current drawn by these devices in real time; is this in windows or some 3rd party software? What is the max current drawn by SSDs & HDDs and does this vary with the data transfer rate? Peter Found a few numbers: Do SSDs use more or less power than HDDs, and by how much? https://www.quora.com/Do-SSDs-use-mo...nd-by-how-much The Power Consumption vs Workload chart is interesting https://superuser.com/questions/5897...ion-ssd-vs-hdd Thanks to all. The reason for the question was to rate very-flexible multi-stranded flexes of small sizes (13 strands x 012mm cable) to replace the stiff ones in normal molex connectors. Since I have many HDDs in the computer case the tangle of the long multi-plug molexs is beyond belief, and now since I have small powerboards inside the case, I want to give each drive its own cable & plug. |
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Current drawn by SSDs & HDDs
On Tue, 19 Jun 2018 10:51:33 +1000, Peter Jason wrote:
On Sun, 17 Jun 2018 20:02:07 -0700, Mike S wrote: On 17/06/2018 5:38 PM, Peter Jason wrote: I have molex connectors to SSDs & HDDs Is the amount of current drawn by SSDs less than the HDDs, given these's no platters to spin? Where can I find the current drawn by these devices in real time; is this in windows or some 3rd party software? What is the max current drawn by SSDs & HDDs and does this vary with the data transfer rate? Peter Found a few numbers: Do SSDs use more or less power than HDDs, and by how much? https://www.quora.com/Do-SSDs-use-mo...nd-by-how-much The Power Consumption vs Workload chart is interesting https://superuser.com/questions/5897...ion-ssd-vs-hdd Thanks to all. The reason for the question was to rate very-flexible multi-stranded flexes of small sizes (13 strands x 012mm cable) to replace the stiff ones in normal molex connectors. Since I have many HDDs in the computer case the tangle of the long multi-plug molexs is beyond belief, and now since I have small powerboards inside the case, I want to give each drive its own cable & plug. You might consider having less larger capacity drives. |
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