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

Final Analysis

The HPT650M is a nice-looking power supply that easily stands apart from the crowd. But most enthusiasts would argue that aesthetics aren't particularly important in the world of PSUs, and we'd agree. In our opinion, it'd be better if the HPT650M distinguished itself with impressive performance instead of an inspired exterior.

FSP's underlying platform is good. However, it's not strong enough to match the benchmark results from similar-capacity PSUs made by Seasonic, CWT, and Super Flower. We'd be a little more forgiving if the HPT650M's price tag was lower, but it's not. For the same amount of money you can get Seasonic's excellent Focus Plus Platinum instead.

Moving forward, we hope that FSP improves this design's overall performance. Specifically, it needs to address the minor rails' mediocre transient response and extend the short hold-up time. We expect high-end power supplies to offer a hold-up time longer than 17ms. At least the HPT650M's power-good signal is accurate.

We're even more concerned that FSP put two EPS connectors on a single cable. This can lead to huge problems if you use both connectors to feed a power-hungry CPU. Given that each connector delivers up to 336W, doubling that amount of power could easily melt the cable, especially if it consists of 18-gauge wires. We're happy to see a company offer two EPS connectors on a 650W power supply. But they have to be implemented properly, otherwise it's better not to have them at all.

FSP's rails clearly don't match the competition when it comes to load regulation and transient response. However, the 5VSB rail sets an example for other manufacturers to follow thanks to its high efficiency. In fact, the HPT650M's 5VSB circuit is one of the most efficient we've ever measured. FSP takes the standby rail very seriously, contrary to other OEMs that don't put as much effort into getting it right.

The HPT650M's most notable advantage compared to the other PSUs in this category is its quiet operation, achieved through the use of a low-speed FDB fan and its relaxed speed profile. Although the HPT650M doesn't offer a semi-passive mode, you won't hear this PSU at idle because of how slowly the fan spins under light loads. We think this is the best approach to cooling, since it doesn't allow for heat to build up inside of the PSU. Sensitive components like electrolytic capacitors don't wear out prematurely as a result.

With a number of upgrades, this could be a very good product capable of matching its competition. Until FSP applies those fixes, though, the company should seriously consider a lower price to make the HPT650M more appealing to enthusiasts and gamers who do their research.

MORE: Best Power Supplies

MORE: How We Test Power Supplies

MORE: All Power Supply Content

Disclaimer: Aris Mpitziopoulos is Tom's Hardware's PSU reviewer. He is also the Chief Testing Engineer of Cybenetics, and developed the Cybenetics certification methodologies apart from his role on Tom's Hardware. Neither Tom's Hardware nor its parent company, Future PLC, are financially involved with Cybenetics. Aris does not perform the actual certifications for Cybenetics.

Create a new thread in the Reviews comments forum about this subject
This thread is closed for comments
Comment from the forums
    Your comment
  • 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.