Silverstone SX600-G: SFX 80+ Gold PSU

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Virtually all consumer IT products have been shrinking for some years, and Silverstone is one long-established case maker that's keenly aware of the trend. Their latest big gaming cases are considerably smaller than previous generations (compare, for example, this year's Raven RV5 to the original Raven), and they've made a concerted effort to introduce HTPC and other small cases utilizing SFX power supplies rather than the much bigger ATX PSUs. The dearth of good SFX power supply options has more or less forced Silverstone to come up with their own, which is a good thing for IT consumers in general and silent PC enthusiasts in particular.

We've looked (in Silverstone case reviews) at their 300W and 450W SFX models, both quite useful and quiet enough, especially at lower power loads. There are four SFX models in the lineup now: 300W Bronze 80 PLUS, 450W Bronze, 450W Gold, and the 600W Gold model under review here. This 600 watter is unique in a number of ways: Gold 80+ efficiency, completely detachable output cables, and the highest rating of any SFX PSU ever.

At Computex in Taipei a couple months ago, Tony Ou, Silverstone's PR/Marketing lead man, was talking up a new metric for power supplies: Power per volume. Specifically, watts per liter. The typical ATX PSU has a volume of ~1.9 liters, which means a 600W PSU offers roughly 315W/liter. Going up the power scale results in higher power density, as the power supplies still have to fit at least in the 8.5 x 15 cm back exhaust plate of every ATX case. So a super power PSU with a deep casing like the Silverstone ST1500 is 529W/L. Make it more efficient and fit it into a smaller casing, like the ST1500-GS, and W/L goes up, to 646W/L. The very small SX600-G being examined here only occupies about 0.8 liters, which gives a whopping power density of 756W/L.

Watts per liter is Silverstone's new metric, touted on PSUs displayed at Computex Taipei 2014.

So aside from this highlight, what are the salient features of this SX600-G PSU? Here's the summary from Silverstone:

Silverstone SX600-G HIGHLIGHTS
from the product page
FEATURE & BRIEF Our comment
Intelligent semi-fanless operation Usually means the fan won't start till a certain temperature is reached
Support standard SFX form factor and ATX via included bracket
Same type of flat plate that accompanies Seasonic PSUs
High efficiency with 80 PLUS Gold certification Very good
100% modular cables
Very handy during installation
All cables made with flexible flat arrays
Also much shorter than usual, for small cases
600W continuous power output at 40ºC operating temperature rated for 24/7 operation Impressive in such small package
Class-leading single +12V rail with 50A It's just what ATX12V calls for
Strict ±3% voltage regulation and low ripple & noise Tight might be a better term than strict
Support dual PCI-E 8/6pin connectors OK

AC Input
90~264VAC, 47~63 Hz
DC Output

The product web page is notable for its comprehensiveness; the SX600-G is more thoroughly spec'd than most retail computer PSUs.

Silverstone SX600-G: Other Technical Details
PFC Active PFC(PF>0.95 at full load)
87%~90%(20% to 100% loading - 80 PLUS Gold)
MTBF 100,000 hours
Operating temperature 0°C ~ 40°C
Over current protection
Over power protection
Over voltage protection
Over Temperature Protection
Under voltage protection
Short circuit protection
No load operation
Connectors 1 x 24 / 20-Pin motherboard (300mm)
1 x 8 / 4-Pin EPS / ATX 12V (400mm)
2 x 8 / 6-Pin PCIE (400mm / 150mm)
4 x SATA (300mm / 200mm / 100mm / 100mm)
2 x 4-Pin Peripheral (300mm / 200mm)
1 x 4-Pin Floppy (300mm / 200mm / 200mm)
Color Black(Lead-Free Paint)
Cooling Single 80mm silent fan
Noise Level 0 ~ 40 dBA
Dimension 125 (W) × 63.5 (H) × 100 mm (D)
Weight 1.45 kg
Form factor SFX

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