Hot Test Results

As we can see in the tables below, the FSP Hydro G 750W can deliver good electrical performance under stress. Our instrumentation recorded a maximum ripple of 40mV on the 12V line, a good figure for a PSU of this class. Similarly, the voltage ripple on the 3.3V and 5V lines is 26mV and 22mV respectively. The filtering is however strange, as the PSU's output power quality degrades at both high and low loads, unlike the vast majority of designs which only degrade as the load increases. The voltage regulation is adequate, at 2.8% for the 12V line, 3.3% for the 3V line and 2.9% for the 5V line.

Main Output
Load (Watts) 153.07 W 380.57 W 562.39 W 744.11 W
Load (Percent) 20.41% 50.74% 74.99% 99.22%
  Amperes Volts Amperes Volts Amperes Volts Amperes Volts
3.3 V 2.2 3.41 5.49 3.39 8.24 3.33 10.98 3.29
5 V 2.2 5.18 5.49 5.13 8.24 5.05 10.98 5.03
12 V 10.98 12.22 27.45 12.16 41.18 11.98 54.9 11.89


Line Regulation
(20% to 100% load)
Voltage Ripple (mV)
20% Load 50% Load 75% Load 100% Load CL1
3.3V + 5V
3.3V 3.3% 16 12 18 22 22 26
5V 2.9% 16 10 18 26 30 30
12V 2.75% 32 26 34 36 40 38

A high ambient temperature has a substantial negative impact on the electrical performance of the Hydro G 750W PSU. The average nominal load (20-100%) efficiency drops by 1.4%, while the maximum efficiency now is 90.6% at 50% load. Nevertheless, the drop is balanced across the entire load range and only slightly greater at maximum load, indicating that the components are not being overly stressed.

Due to the high ambient temperature, the fan of the Hydro G 750W PSU started with a load of 210 Watts this time and, naturally, began accelerating much quicker than before. Acoustics are being sacrificed but the Hydro G maintains comparatively low operating temperatures, surpassing 80°C only on the small secondary side heatsinks and under maximum load. Apparently, FSP does want this unit to remain quiet under normal operating conditions, but they are more than willing to sacrifice that acoustic comfort when the conditions are harsh in order to ensure the longevity of the PSU itself.

Cold Test Results Final Words
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  • MrSpadge - Thursday, March 3, 2016 - link

    Because the PSU likes water spilled on it, I guess.
  • Shadowmaster625 - Thursday, March 3, 2016 - link

    Why have "Hydro" in the name if it doesnt have any liquid coolant in it?
  • Murloc - Thursday, March 3, 2016 - link

    because it sounds cool (pun intended)
  • LiviuTM - Thursday, March 3, 2016 - link

    more likely from the "Hydro Dynamic bearing", I guess.
  • geniekid - Friday, March 4, 2016 - link

    They should get into aftermarket cooling. "FSP Hydro Extreme - the ultimate air cooling solution."
  • DanNeely - Thursday, March 3, 2016 - link

    "The number of connectors per cable is a bit unusual though. For example, one cable has four SATA connectors, another has two SATA and two Molex connectors, and two of them have two SATA, one Molex and one floppy connector each. There is no cable with just Molex connectors on it. "

    It might be unconventional, but in principle I kinda like it; much better than every cable being identical. I was wiring up a new box a few days ago, and ended up using a cable with 4 or 5 sata connectors to power a single SSD and via a sata to molex adapter the case's built in fan controller; while having to stuff the rest out of sight in the very cramped space behind the mobo. I'd probably only have put molexes on 2 of the cables though because they're getting somewhat rare. Wiring a floppy connector in at all is rather surprising; virtually nothing has used them for years.

    Also, that description adds up to 10 sata connections 4+2+2+2, not 12 as in the summary table.
  • nagi603 - Monday, March 7, 2016 - link

    Other manufacturers have somewhat better mixes for their modular ones. My Seasonic X400 has shorter cables with only 2 sata connectors on it, and also one with 2 molex connectors. Either would have worked for you. The mixed ones of FPS are bad because in a high-power build, you plan to use a lot of sata connectors tipically, or a lot of molexes. Not both.
  • rhysiam - Thursday, March 3, 2016 - link

    Thanks for the review!

    Just a suggestion, could you chart the claimed 80 Plus standard on the "Energy Conversion Efficiency" charts? I know we can look it up and compare that way, but it would be much easier to have a unit's performance and 80 Plus (Gold in this case) standard on the chart for comparison. Thanks.
  • mauler1973 - Saturday, March 5, 2016 - link

    When I click on the newegg link for the product it goes to toms hardware site address before going to newegg. What's the deal?
  • Oxford Guy - Friday, March 11, 2016 - link

    "Their designs are usually found in advanced mid-range units, such as the Be Quiet! Dark Power Pro 10 series"

    The Dark Power Pro 10 series had high-end units made by Seasonic in it, not just FSP models. They came with advanced features like a Lunpen filter and a premium fluid bearing fan. The series topped out at 1200 watts.

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