SilverStone SX600-G SFX Power Supply Review

SilverStone's SX600-G is one of the most capable SFX PSUs you can buy. Six-hundred watts is a lot for this form factor, and today we are going find out if the company's offering is able to deliver its advertised power even in extreme conditions.

SilverStone is one of the few manufacturers that shows great interest in small form-factor PSUs. Aside from the compact ATX power supplies its portfolio includes, the company also has an SFX series that includes five members with capacities ranging from 300 to 600W. The two lower-output models are 80 PLUS Bronze-certified, while all the rest meet the 80 PLUS Gold requirements. Today we're taking a detailed took at the family's flagship, the SX600-G.

Since SilverStone also manufactures enclosures, it found out early that enthusiasts with small cases may need compact dimensions, but strong PSUs to support high-end components. With so many mini-ITX cases on the market, there are plenty of choices. On the other hand, there aren't a lot of SFX PSU options. That's doubly true for units with over 500W capacity exploiting a fully modular cabling design. So SilverStone practically plays alone in this arena. Fortunately, since it's quite experienced with the form factor in question, SilverStone is traditionally a trusted source for quality products. We're naturally expecting a lot out of the SX600-G, then, which we are going to put through extreme loads and hot environments. After all, inside a small chassis, temperatures can rise quickly.

Besides 80 PLUS Gold-rated efficiency and fully modular cabling, the SX600-G also enables semi-fanless operation that is deactivated (according to SilverStone's specifications) once the supply's internal temperature reaches 45 degrees Celsius. It is amazing to see such a high-capacity SFX PSU using a fanless mode, and we were interested in checking this mode's performance in the real world. Surely high efficiency plays a key role in keeping thermal dissipation at low levels. But the airflow in this unit can't be optimal, since the large components needed to generate 600W take up so much room. We'd expect the result to be a quick increase to that target 45 °C threshold once the PSU is stressed.

Specifications

SilverStone's efficiency rating satisfies the 80 PLUS organization's Gold specification. That level still retains some prestige, although currently it comes third behind the 80 PLUS Platinum and Titanium certifications. To the best of our knowledge, there aren't any SFX PSUs available with higher than a Gold rating, and it definitely won't be easy to manufacture one.

The SX600-G is fully modular and supports the sleep states (C6 and C7) that Intel's Haswell-based processors introduced. In addition, it is equipped with all basic protection features, though according to SilverStone's specifications, Over-Temperature Protection (OTP) isn't available; we consider that capability to be crucial.

The maximum operating temperature at which this unit can deliver full power continuously is 40 °C, according to SilverStone. Taking into consideration the other technical specifications, we have to assume that it was hard to guarantee trouble-free operation under full load at 50 °C. However, we will follow our testing protocol that dictates full load and overload testing at 45 °C.

As for cooling, the SX600-G uses a small, double ball-bearing fan, and SilverStone exploits a semi-passive mode to make this PSU quieter at light loads. The company states that the fan starts spinning only when its internal temperature exceeds 45 °C; we will check this by testing at ambient temperatures, since the conditions in our hotbox won't allow for conditions under 45 °C. Finally, SilverStone covers this supply with a three-year warranty -- a bit brief, in our opinion, for a PSU at this price point. We would prefer a five-year guarantee. 

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  • Dark Lord of Tech
    Price is a little high.
  • Onus
    The price is a little high.
    I'm not sure I agree with such high ratings of some of the Corsair units, with as many failures as they apparently experience within the first year. It also doesn't bode well for the poor capacitors in this Silverstone either. So far though, at this level, there is no other choice.
  • damric
    The review was perfect this time, Aris. My only nitpick is the graphs are hard to read.

    Well done.

    As far as the PSU itself, I was turned off by the 40C max operating temp fan kicks up at 45... bah... If they would have used better caps then temp could easily been rated for 50C.
  • David Dewis
    I wanna use this to run a GTX 980 in the Silverstone RVZ02 with a i5-4670 (non K) That is all.
  • g-unit1111
    Nice to see that manufacturers are starting to take small form factor builds seriously. I especially like the direction that Silverstone is going in. First the RVZ02B now high quality SFF power supplies. Wave of the future?
  • DarkSable
    This is a wonderful power supply, if you aren't pushing it altogether too hard.

    @David Dewis, go look at the Sandia Cooler. When you're done lusting after that, look at the Id-cooling Is-vc45 Vapor Chamber CPU Cooler... which you can buy right now and use to overclock an i5 in the new Raven just fine. I've got my media PC in an RVZ01 with a Pentium anniversary edition overclocked to heck, and it does just fine. (I can't wait for the RVZ02 to put my gaming rig in and run watercooling out the back.)
  • DarkSable
    That being said. Tom's. What are you doing.

    Silverstone just released the SX500-LG, which is a very slightly longer (130mm) SFX-profile power supply that fits a 120mm fan on top, instead of a dinky, noisy 80mm fan. That's the power supply that I want to see a review of!
  • g-unit1111
    933870 said:
    (I can't wait for the RVZ02 to put my gaming rig in and run watercooling out the back.)


    I very badly want a RVZ02, it will make a nice home for my old i5-3570K. :lol:
  • Grognak
    52dB and more than 25 idle... "Tiny box that makes a lot of noise" isn't my definition of SFF.
  • Aris_Mp
    I will ask for the SX-500LG, however I have many samples to process till its turn comes to hit the test bench. Unfortunately a full PSU review needs lots of time and I won't do rushed reviews.
  • Geoff C
    I converted my i7 920 (ATX Mobo) and 7970 to an SFF case 12"x17"x4" last year and have been powering it off of Silverstone's previous SFX450 - I know I'm pushing the power supply long and hard (and when gaming and taxing the CPU and GPU the PSU fan also really spins up).

    Any way to compare/contrast the SFX450 vs the 600? I know its an extra $130 but I'm tempted to upgrade the PSU in the next 6 months just because I know I'm taxing it by running it so hard...
  • warmon6
    @Grognak,

    Good thing SFF means "small form factor" and not "Low Noise Form Factor" :lol:
  • Aris_Mp
    @Geoff C

    You can read the review of the SFX450 below. It was made with the same equipment so the results are comparable.

    http://www.techpowerup.com/reviews/Silverstone/ST45SF-G/
  • arossetti
    I have this PSU in an NCase M1 V2. I've never experienced and issue with it and to me it's dead silent. It's a little on the pricey side but for my case it was really the only option for building as high performance ITX build with the NCase.