Thermaltake Toughpower SFX 850W Gold PSU Review

Protection Features

OCP (Cold @ 26°C) 12V: >104A (>146.87%), <11.776V
5V: >28A (>140%), <5.08V
3.3V: >27.1A (>135.5%), <3.34V
5VSB: >4.3A (>143.33%), <4.903V
OCP (Hot)
OPP (Cold @ 35°C) >1277.52W (>150.3%)
OPP (Hot)
OTP ✓ (>185°C @ 12V Secondary)


12V to Earth: ✓
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓

PWR_OK Proper Operation
SIP Surge: MOV
Inrush: NTC Thermistor & Bypass Relay

OCP is sky-high on all rails, and to make matters worse, the PSU broke during the cold OPP test, exceeding 150% of its max-rated capacity! To add insult to injury, the second sample broke during the over-temperature evaluation test. It stopped working at 185°C and didn’t start again. HKC needs to take a good look at the protection features.

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8 thoughts on “Thermaltake Toughpower SFX 850W Gold PSU Review

  1. I also bought myself a Thermaltake Toughpower SFX 850W Gold PSU for my Fractal Terra build. I had this Corsair SF850L 850W from a previous build, but I thought I would go smaller, so as to put a 120 mm fan. Boy do I regret. The Thermaltake sounds like it has a canary locked inside, making a chirping noise, almos continuous, you can hear 7 meters away. Considering the price, this is outrageous. Thinking about going back to my Corsair, who’s fas was anyway idle most of the time…

    1. How you install it? With the fan facing downwards? Also, Cybenetics Standard+ rating is not what I call silent. The average noise output of 35-40 dBA is notable.

  2. Exactly the same thing happens to me, the screeching noise that this source emits is unbearable, with the money it is worth and this huge failure.

  3. Great review with alot of detail thanks guys, I’ve read alot of forums and seen videos of numerous people complaining about the Thermaltake SFX850 having loud coil wine at lighter loads (about where the fan just about starts spinning due to load). Was this noticed during the testing of your unit?

    1. we didn’t notice something, else we would have wrote about it, but it can happen yes, with different production batches. By testing 1-2 PSUs only, you can’t have a complete picture about the whole production, sorry.

  4. Mine has a horrid whine when the fan can’t decide wether it wants to spin or not. This doesn’t seem to be an uncommon issue either which is annoying. So far warranty support has been unhelpful.

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