Powerful SilverStone SX1000 – 1000W Fully Modular

Around the past several of years, many of the larger PSU makers introduced small SFX and SFX-L PSUs that were made to match up the power standards of effective video gaming systems. Along with power output scores reaching 700 Watts or far more, some of them could actually power flagship-level PC gaming systems. This was quite the feat considering that finding a quality SFX PSU even for a popular gaming system was a very difficult mission until a couple of years ago.
However, for some buyers, even 700 Watts is not going to be adequate. Specifically as you begin mixing up over into the high-end workstation space – think numerous Radeon Pro workstation cards here – even a lot more power is necessary. So to complete that task SilverStone has rolled out a 1000 Watt SFX-L form factor PSU, the SX1000.
Currently well-known for products and solutions like their SFX design-pushing SX800-LTI 800W PSU, the company has gone back to the drawing panel in an attempt do one much better. We did not expect that the company would very easily handle to squeeze even more power out of an SFX PSU, and yet close to three years after the launch of the SX800, here we are: SilverStone has an SFX-L PSU with the shocking output of 1 kW. This right now is the most powerful SFX-L PSU on the market place, so of course we need to take a look at it to see exactly how it stacks up.
The SilverStone SX1000 is a fully modular power supply, which means that every single cable can be unattached, together with the 24-pin ATX cable. Building the 24-pin ATX cable detachable generally does not make any functional sense, but it does in this case: allowing the user can change the short 12” ATX cable with a longer variant if the PSU is going to be installed inside of an ATX case. Without any exclusion, all of the cables are “flat” type cables, with black wires and black connectors.SilverStone SX1000The SilverStone SX1000 is an SFX-L model, meaning that it is primarily based on the SFX standard but it is 30 mm deeper. Its case measures 125 (W) × 63.5 (H) × 130 (D) mm (4.92 x 2.5 x 5.12 inches), which does reduce the match ups of the power supply, as several SFX-compliant cases do not provide that type of clearance. Even so, cases meant to hold SFX PSUs and multiple(extra-large) video cards should all be supplying good enough clearance for an SFX-L PSU.
SilverStone is definitely not a company that designs aesthetically luxury products and the SX1000 stays to that tradition, with the designer sticking to a classic all-black design. The chassis is sprayed with satin black paint but most of its surface is covered by stickers. The stickers on the sides of the unit only display the company and product logos, whereas the sticker that covers the whole of the unit’s top side hosts the standard electrical specs and certifications of the unit. At the bottom part of the unit, we can see the black fan and the finger guard, with a metallic crest presenting the company’s logo covering the fan’s engine.
Despite the quite cramped space requirements, the designer continue to managed to fit an on/off button next to the AC receptacle. The front side of the unit is covered by a lot of cable connectors, together with a sticker label that hosts a basic legend. All of the cable connectors except those of the ATX cable are protected with plastic-type material protective caps.
A main advantage of the SFX-L form factor is that it allows for 120 mm fans to be mounted, a requirement for the cooling needs of this kind of a powerful unit. Globe supplies the low profile 120 mm fan, which is a dual ball bearing model with a max speed of 2400 RPM at 12 Volts. This is a unusual option by SilverStone, as the company generally prefers to use sleeve bearing fans because of their lower noise output, even for their top-tier items.SilverStone SX1000The filtering level of the SX1000 is a little bit beefed up, as it begins at the rear of the AC receptacle and continues onto the main PCB, with four Y capacitors, four X capacitors, and two filtering inductors. There are 2 APFC capacitors, provided by Rubycon, rated at 400 V / 470 μF each. A big filtering inductor is located right next to them. The heatsinks are fairly standard for a PSU with that kind of output, with relatively minimal mass and surface area. We would not expect to see this sort of heatsinks in ATX units rated over 600 Watts, yet the limited space in the SX1000 needs certain sacrifices. That does not mean that the temperature ranges of the components have to escalate but does hint the use of special very low loss parts that will generate minimal amounts of heat – which also are relatively expensive.

High quality construction with all Japanese capacitors High quality construction with all Japanese capacitors
The electrical effectiveness of the SilverStone SX1000 is very good and within our expectations for an Enhance platform. Line filtering could use some enhancement, as the voltage ripple figures are reasonably high, with our tools recording a max of 78 mV, 34 mV, and 26 mV on the 12V, 5V, and 3.3V lines respectively. These figures are enough, but top tier units very easily halve these values. Meanwhile line regulation is drastically better, with the 12V line maintaining a regulation factor of 0.9%. The regulation of the 3.3V and 5V lines is a little greater than 2%, which is good enough for a modern design.  Video: SilverStone-YouTubeThe electrical functionality of the SilverStone SX1000 is certainly not bad at all – it does meet all 80Plus Platinum certification and quality requirements with ease – it is just a minimal worse than its less powerful predecessors. It as well struggles to maintain reasonable noise and temperature levels when the load is very high, even when the operating conditions is relatively cool. However, due to the possibility of high internal temperatures, the designer is using very high-quality components so that they will not be thermally stressed. This bodes well for the quality and long life of the SilverStone SX1000, as these components will perform very reliably under typical operating conditions. Photo: SilverStone
The development of a highly effective gaming small form factor PERSONAL COMPUTER for the living room is the true desire of every single serious game player. Still, few are determined enough to be capable to justify an aesthetically elegant and compact gaming PC with a flagship graphics card in it. However, SilverStone’s latest power supply is created to specifically focus on that small, yet existent, segment of the current market. More pragmatically, possibly, it could also be used to power systems with a single high-end graphics card while working close to its half potential, offering top performance and reliability. However, the quite high retail price of $366 at this writing significantly limits the marketplace potential of the SX1000, as only consumers who do not care about having a price range when building a PC would buy it.


Load Range
+3.3V +5V +12V +5VSB -12V
25A 25A 83.3A 3.0A 0.3A
Peak (Amps)
/ / / / /
0A 0A 0A 0A 0A
Range (%)
±3% ±3% ±3% ±5% ±10%
Line Reg.(%)
±1% ±1% ±1% ±1% ±1%
40mV 40mV 100mV 40mV 80mV
Model (safety certification)
Black(Lead-Free Paint)
Combined +3.3V & +5V
Combined +12V
Input Voltage
90V ~ 264V
Input Frequency Range
47Hz ~ 63Hz
Active PFC(PF>0.9 at full load)
89% ~ 92% at 20% ~ 100% loading
100,000 hours
Operating temperature
0°C ~ 50°C
Over current protection
Over power protection
Over voltage protection
Short circuit protection
Over temperature protection
1 x 24 / 20-Pin motherboard connector(300mm)
2 x 8 / 4-Pin EPS / ATX 12V connector(”400mm” x 2)
6 x 8 / 6-Pin PCIE connector(”400mm / 150mm” x 3)
8 x SATA connector(”300mm / 200mm / 100mm / 100mm” x 2)
3 x 4-Pin Peripheral connector(300mm / 200mm / 200mm)
1 x 4-Pin Floppy adapter connector(100mm)
Cooling System
Single 120mm dual ball bearing fan
Form factor
Noise Level
0 ~ 36 dBA
125 mm (W) x 63.5 mm (H) x 130 mm (D)
4.92″ (W) x 2.5″ (H) x 5.12″ (D)
1.39 Kg
80 PLUS Platinum


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