You can refer to our article called Hard Disk Drive Power Consumption Measurements: X-bit’s Methodology in Depth for details on this test. We will just list the specific modes we measure the power consumption in:
- Start (the current the drive consumes when starting up)
- Idle (the drive is not accessed at all, but it is turned on and ready to work)
- Random Read and Write
- Sequential Read and Write
We don’t publish the results of the X25-V RAID because our testbed only allows measuring the power draw of one drive at a time. You can just multiply the results of the single drive by 2, though.
Let’s check out each mode one by one.
The Intel SSDs need only half the current required by the other models. Interestingly, the 256GB Western Digital consumes much more power than its junior cousin which must be due to the effect of its larger-capacity flash memory chips. That model from WD and the Kingston V series require over 1 ampere, which is more than today’s 2.5-inch HDDs need.
The Kingston is the only SSD to act up in idle mode. It needs twice the power the other SSDs want. It either cannot switch into sleep mode with reduced power consumption or was busy minding some business of its own.
At random loads, the Kingston needs a lot of power at writing while being quiet economical at reading. It is the Intel SSDs that are the most economical at reading, though. They are also as economical as the WD drives at writing.
The Intel SSDs are also superior at sequential operations. The WD drives consume more than the others at reading just as the Kingston does at writing.