FSP HYDRO G 650W Power Supply Review

While FSP may not be a PSU brand that is on the tip of your tongue, we have been reviewing FSP computer power supplies now for 8 years, and the fact of the matter is that these units have been getting better and better over time. Where does the new Hydro G 650W fit into that progression?



The FSP Hydro G 650W is the second member of Hydro G series that we have seen from FSP. With this unit coming in at 650W, and being a bit lower down the capacity scale than the last unit, we are getting the opportunity to see how well the Hydro G design scales. The good news is the previous Hydro G 750W was a success so we would expect the same from the 650W model today as well. However, if everything went as planned then everyone who has ever bought a lottery ticket would have won the lottery by now. So, let's move on and see if the Hydro G 650W has struck it rich today or if it has just struck out.

HardOCP’s testing methodology is intended to very much push power supplies to their advertised wattage rating in temperatures that will represent some of the hottest computer enthusiast cases. So if a unit passes all our testing it is definitely not something to take lightly. In fact we expect more power supplies to fail our testing than make it through unscathed.

Build Quality

The FSP Hydro G 650W build quality starts things off today on the same good note that the Hydro G 750W did as their build qualities are identical for all intents and purposes. The exterior of the unit once more has a nice look to it while also carrying FSP's new interchangeable stickers which allow you to change the logo look. While those stickers are not particularly amazing, the rest of the finish is high quality and the unit is fully modular with FlexForce style cables. When we move to the interior, we find a very modern topology once more that is fitting for the units product placement. When we look to the component selection, we again see somewhat of a mixed bag. On the upside, we get Nippon Chemi-con and Rubycon standard capacitors along with a FDB fan. On the downside, we get Teapo solid capacitors. While those are not the best solid capacitors we have seen, they are at least solid capacitors so they should be a bit more robust and everything is, seemingly, well put together today. When we turn our attention to the support for this unit, we see the same mixed bag of pluses and minuses that we saw with the 750W model. So, making a second appearance is a 5 year warranty and right along with it is documentation that is, once more, very close to worthless.

Load Testing

The load testing results of the Hydro G 650W shouldn't be much of a surprise given the results posted by the Hydro G 750W we saw recently. As was the case then, the results posted by the Hydro G 650W are simply excellent. When we look at the voltage regulation, the 12v rail showed a peak change of 0.08v while the 5v and 3.3v rails showed peak changes of 0.08v and 0.06v respectively. These values are generally excellent by absolute numbers and they are very very good by relative values as well. How good? Well, the Hydro G 650W was better than EVGA NEX650G, Cyonic AU-650x, and the Thermaltake Toughpower DPS G 650W while only ending mixed compared to the XFX ProSeries 650W. Then, when we look at the efficiency, we see that the efficiency is also doing very well as it ranged from 87.32% to 91.75% efficient at 120v and 85.50% to 90.70% efficient at 100v. When we look at the 80 Plus results, we see that, using 80 Plus’s loads and conditions, the Hydro G 650W was 87.28%-90.52%-87.17%. These excellent values mean that this unit falls within the 80 Plus Gold category. Lastly, the Hydro G 650W passed our Torture Test in fine shape.

Moving on to the Transient Load Tests, we see that this unit posts values that are passing but, like the Hydro G 750W before it, only competitive in the most basic sense of the word. During our Transient Load tests, the 12v rail had a peak change of ~360mV and the loaded 5v rail had a peak change of ~70mV while the unloaded 5v rail during the 12v load had a peak change of ~70mV. With these values the Hydro G 650W was only able to end mixed compared to the EVGA NEX650G, the Cyonic AU-650x, and the XFX ProSeries 650W. True the unit did best the Thermaltake Toughpower DPS G 650W, but overall that means this unit is still just doing "ok" relative to a lot of older units and we would very much like to see better results from this unit than this.

DC Output Quality

When we look at the DC output quality of the FSP Hydro G 650W, we see that this unit is bouncing back to the form we initially saw in our standard load tests. During testing, the Hydro G 650W saw all of the main DC output rails start off at ~20mV of ripple/noise or below. When the trace amplitudes increased during testing today they did so by small margins as the peak value on the 12v rail was ~25mV, the peak value on the 5v rail was ~10mV, and the peak value on the 3.3v rail was ~15mV. As was the case before with the Hydro G 750W, these values are impressive for absolute numbers and when it comes to relative values they are more than holding their own as well. Indeed, the Hydro G 650W bests the EVGA NEX650G, the Cyonic AU-650x, and the Thermaltake Toughpower DPS G 650W. Among the units we have been looking at today, the only unit that the Hydro G 650W does not best is the XFX ProSeries 650W. So, while not a clean sweep, this is an impressive showing by the Hydro G 650W.


The FSP Hydro G 650W follows in the footsteps of a number of power supplies from FSP (and just about everyone else these days) by claiming that it is going to be a quiet product. In this case, the Hydro G 650W has a number of things going for it such as very high efficiency, a FDB fan, a clean layout, and pedigree. The good news is the Hydro G 650W does not let its predecessor down as it was very quiet in our load testing environment. Indeed, the only time this unit was audible was during our full load tests and then, as before, I had to be directly inline with the units exhaust to detect it in our load testing environment. As such, the Hydro G 650W joins the Hydro G 750W as a good option for users looking for a quiet power supply in normal and quiet cooling scenarios.

Paul's Thoughts:

After the Hydro G 750W review a number of people were a bit surprised at how well that unit did in our testing. If you were one of those people and if there were any questions about whether or not the Hydro G series of power supplies was a good line of power supplies after that review then hopefully today's review of the Hydro G 650W will settle that for you; because it is a very very good line of products. So, go buy one. That's sort of all I have for you today as this unit is essentially a carbon copy of the 750W model at 650W output. Ok, good chat everyone, good chat.

You're still here? It's over. Go home. Go.

The Bottom Line

The FSP Hydro G 650W is the second power supply we have seen from FSP in the Hydro G line and this review played out almost identically to that of the first power supply we saw from this line. Looking at the Hydro G 650W, we again see a unit that had excellent voltage regulation, very good efficiency, excellent DC Output Quality, and very good/excellent build quality. To continue with the broken record sound of things today, the aspect of this units performance today that was not in the very good to excellent category was the units Transient Load Test results. However, you can't please everyone and that did mostly had to do with relative values not necessarily absolute values. Now, when we look at pricing today, we see that the unit is coming in at $89.99 plus shipping (or $74.99 after MIR plus shipping) which makes it more than competitive with the 650W units we have been comparing it too. Indeed, that makes it one of the cheaper options among those units. Therefore, this unit is a bit of a no brainer, save for one issue, as it has not only performance but price going for it as well. That issue? The 750W model in the Hydro G line is available right now for $79.99 after $20 MIR, and it is just as good of a PSU. Sure most people don't need 650W's let alone 750W for most builds, but lots of people look at price differences like this and justify themselves into the larger product. Therefore, the biggest issue the Hydro G 650W has going for it today is that there is a Hydro G 750W model on the market.

Move quick as the rebates at Newegg end tomorrow.

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FSP HYDRO G 650W Power Supply