Is an SSD NAS cheaper to run?
By Devin Chua · Data checked by Owen Nakamura · Updated On electricity alone, an SSD saves about CA$5.07 a year per drive versus a hard drive — real, but small. The catch is the upfront price: flash costs far more per terabyte (about CA$316.48/TB more per TB at today’s live prices), so for bulk storage the premium never pays back on power within a drive’s life. SSDs win on noise, size and speed — not on running cost for capacity.
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The payback maths, at live prices
The power side is easy: a 2.5″ SSD draws ~1–2 W against a 3.5″ hard drive’s ~4–6 W, so per drive that is about 5 kWh a year versus 44 kWh — a saving of roughly CA$5.07 a year at 13¢/kWh. The price side is where it turns:
- Cheapest tracked NAS hard drive: CA$46.24/TB per TB.
- Cheapest tracked SSD: CA$362.72/TB per TB.
- SSD premium: CA$316.48/TB per TB more than a hard drive.
Swapping a single 4 TB hard drive for a 4 TB SSD therefore costs about CA$1,266 more upfront and saves about CA$5.07 a year — a payback of roughly 250 years, well beyond the drive’s useful life. For multi-terabyte bulk storage, flash simply does not pay back on electricity. (Prices are live from Amazon.ca and update on each sync, so this figure stays current.)
Where an SSD NAS genuinely wins
Running cost is the wrong reason to go all-flash, but there are good ones: a silent, coolbox for a living room; a small library (photos, a working set) where the terabyte count is modest enough that the premium is bearable; and an SSD/NVMe cache or metadata volume in front of a hard-drive pool, where a little flash speeds the whole array without paying for bulk capacity in flash. For everything else — media libraries, backups, archives — hard drives remain far cheaper to buy and, over the drive’s life, cheaper overall. Compare the whole-NAS figure in the operating-cost calculator, and the capacity trade in how many drives do I need.
Frequently asked questions
Is an SSD NAS cheaper to run than a hard-drive NAS?
On electricity, yes — an SSD saves roughly CA$5.07 a year per drive versus a hard drive at 13¢/kWh. But SSDs cost far more per terabyte (about CA$316.48/TB more per TB at today's prices), so for bulk storage the upfront premium dwarfs the power saving and it never pays back within the drive's life. SSDs win on noise, size and speed, not on running cost for capacity.
How long until an SSD NAS pays back on power?
At today's live Canadian prices, swapping a 4 TB hard drive for a 4 TB SSD costs about CA$1,266 more upfront and saves about CA$5.07 a year in power — a payback of roughly 250 years, far beyond a drive's useful life. In other words, for bulk capacity it effectively never pays back on electricity alone.
When does an SSD NAS actually make sense?
When capacity is small or the reasons aren't about cost: a silent, cool, low-idle box for a living room; a small photo or working-set library where the TB count is modest; or an NVMe/SSD cache and metadata volume in front of a hard-drive pool. For multi-terabyte bulk storage, hard drives remain far cheaper both to buy and, over the drive's life, overall.
Do SSDs really use less power than hard drives?
Yes — a 2.5-inch SATA SSD draws about 1–2 W versus a 3.5-inch hard drive's 4–6 W, and it has no spin-up. Across a year that is roughly 5 kWh versus 44 kWh per drive. The power difference is real; it is just small in dollars next to the price premium of flash for large capacities.
Devin Chua works out which drives, RAM and NVMe cache fit which NAS model at nasdrives.ca, and what the RAID choice means for usable capacity, checked against what is in stock on Amazon.ca.
Data checked by Owen Nakamura, Technical editor (data checking)