FSP Hydro PTM 650W PSU Review: Clean, Quiet Power for Mid-Range PCs

Protection Features and DC Power Sequencing

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features. Our protection features evaluation methodology is described in detail here.

Protection Features
OCP12V: 63.8A (117.78%), 12.039V
5V: 31.1A (155.5%), 5.037V
3.3V: 30.2A (151%), 3.323V
5VSB: 4.2A (168%), 4.978V
OPP781.3W (120.2%)
OTP✓ (160°C @ 12V heat sink)
SCP12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓
PWR_OKAccurate (but less than 16ms)
NLO
SIPSurge: MOV
Inrush: NTC thermistor & bypass relay

OCP on the +12V rail is set properly, while the minor rails have high OCP triggering points. Over-power protection is configured conservatively at 120.2%. We prefer this to an unrealistically high OPP setting.

Over-temperature protection works properly, and we confirmed that short circuit protection operates as-expected on every rail. The power-good signal is accurate, but it's far too low at ~10ms. According to the ATX specification, this should be at least 16ms.

DC Power Sequencing

According to Intel’s most recent Power Supply Design Guide (revision 1.4) the +12V and 5V voltages must be equal or greater than the 3.3V rail’s output at all times.

For our first measurement, we turn the PSU off and switch it back on without load on any of its rails. In the second test, we set the PSU to standby mode, dial in a full load, and start the PSU. In the last test, with the PSU switched off, we dial in a full load before restoring power.

Everything goes smoothly in these tests; the 3.3V rail is lower than the +12V and 5V rails at all times.

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  • AnimeMania
    Is there a reason why they put the word "Hydro" in the title?
  • SR-71 Blackbird
    Thanks Aris , nice review , much appreciated.
  • average joe
    they want to market it as water cooler compatible... yeah i know..
  • average joe
    there used to be some really crappy power supplies in the world but now most of them are fine. you had to be really careful or you burn up everything. that doesn't happen anymore.
  • average joe
    there really only three companies that make PSU now and they all just badged for different brands. one might insist on using higher grade but its still a superflower.
  • average joe
    rosewill capstones are usually superflower and 1/2 the money
  • police_leduc113
    Even so, for guys like me who only use a "normal pc" without OC, this one will do just fine right? Cause i got it from black friday for the right price, while Seasonic stuff are insanely expensive in my country
  • SR-71 Blackbird
    Some of the Rosewill Capstones , don't get good reviews from buyers , I avoid them.
  • Co BIY
    POLICE_LEDUC113 - Yes, This is a better than average power supply. Not the absolute best but priced in the US with the absolute best. If you got it at good price compared to the competition then it will do well for you.