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SilverStone SFX-L 800W Titanium Power Supply Review


Introduction and Features


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SilverStone continues to push the envelope of power density with the release of their new SX800-LTI small form factor power supply. Following close on the heels of the SX700-LPT, the new unit now packs 800 watts into a small chassis. SFX form factor cases and power supplies continue grow in popularity and in market share and as one of the original manufacturers of SFX power supplies, Silverstone Technology Co. is striving to meet customer demand.


(SX=SFX Form Factor, 800=800W, L=Lengthened, TI=Titanium certified)

SilverStone has a long-standing reputation for providing a full line of high quality enclosures, power supplies, cooling components, and accessories for PC enthusiasts. With a continued focus on smaller physical size and support for small form-factor enthusiasts, SilverStone added the new SX800-LTI to their SFX form factor series. There are now eight power supplies in the SFX Series, ranging in output capacity from 300W to 800W. The SX800-LTI is the third SilverStone unit to feature a lengthened SFX chassis. The SX800-LTI enclosure is 30mm (1.2”) longer than a standard SFX power supply case, which allows using a quieter 120mm cooling fan rather than the typical 80mm fan used in most SFX power supplies.

In addition to its small size, the SX800-LTI features very high efficiency (80 Plus Titanium certified), all modular flat ribbon-style cables, and provides up to 800W of continuous DC output (850W peak). The SX800-LTI also operates in semi-fanless mode and incorporates a very quiet 120mm cooling fan.

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SilverStone SX800-LTI PSU Key Features:

•    Small Form Factor (SFX-L) design
•    800W continuous power output rated for 24/7 operation
•    80 Plus Titanium certified for very high efficiency
•    Quiet operation with semi-fanless operation
•    120mm cooling fan optimized for low noise
•    Powerful single +12V rail with 66A capacity
•    All-modular, flat ribbon-style cables
•    High quality construction with all Japanese capacitors
•    Strict ±3% voltage regulation and low AC ripple and noise
•    Support for high-end GPUs with four PCI-E 8/6-pin connectors
•    Safety Protections: OCP, OPP, OVP, UVP, SCP, and OTP

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Here is what SilverStone has to say about their new SX800-LTI power supply:

Since its launch in 2015, the SFX-L form factor has garnered popular recognition and support among enthusiasts with its larger 120mm fan able to achieve better balance of power and quietness in small form factor PCs than what was possible with standard SFX. And as a leader in power supply miniaturization, SilverStone has continued its efforts in advancing the SFX-L forward to reach ever higher limit.

The SX800-LTI not only has unprecedented 800 watts of power output but also has the highest level of 80 PLUS efficiency with a Titanium rating. It includes all features available from top of the line SilverStone PSUs such as flexible flat cables, all Japanese capacitors and advanced semi-fanless capability. For those looking to build the most efficient small form factor systems possible with great quality and power, the SX800-LTI is definitely the top choice.

Please continue reading our review of the SilverStone SX800-LTI PSU!!!

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March 27, 2017 | 12:58 PM - Posted by Anonymous (not verified)

I do not quite get it. Who needs 800W in SFF PC? 800W is required for top/overclocked SLI or Crossfire configuration only.

March 27, 2017 | 01:55 PM - Posted by Anonymous (not verified)

Perhaps if Corsair comes out with something like the TWO.....which I would do an SLI config on to play on the name or something....

March 27, 2017 | 02:08 PM - Posted by quest4glory

Works well with an ATX adapter and would be perfect in an mATX case (which supports SLI) meaning you have more breathing room. Also, more options is never a bad thing.

So, overclocking your CPU and GPU can tax a PSU, and therefore that extra headroom is good to have.

Finally, it's Titanium rated. Perhaps they didn't want to put their best components in a 400W PSU, so they are doing more of a "one size fits many" configuration here.

You just don't see a lot of good quality PSUs in the lower end of the scale, and that's in part due to a consumer education issue, but also, it costs more for each SKU you pump out. In other words, it's an efficiency thing on the manufacturing side as well.

March 29, 2017 | 12:24 AM - Posted by Anonymous (not verified)

I will buy it, not because I need that extra wattage, but I need to push the silentness to the limit. With only use 200watt on my ITX, means with 800watt psu, It will be in 40% of its fan envelope, which sometime even the fan still not kicked on. Problem with psu without fan, is the hizzing sound

April 3, 2017 | 08:44 AM - Posted by Anonymous (not verified)

Quite obvious, the sweet spot is 50% usage on a PSU. When you get closer to 100% load, there is a chance that capacitors will pop. Also caps lose capacitance over time. I suppose it won't matter if you upgrade every year though.

March 27, 2017 | 05:34 PM - Posted by Lance Ripplinger (not verified)

I always enjoy your power supply reviews. Very insightful and thoughtful. It almost seems like Silverstone was trying to cut corners a bit on cost here. Using sleeve bearing fan, and cheap Rubycon capacitors is very unfortunate. I agree they should have used a much higher quality fan, and a much better Japanese capacitor. And that warranty is not good either. Very surprised Silverstone did this. They have always had such a good reputation for quality. An otherwise nice SFX power supply though.

March 28, 2017 | 03:02 AM - Posted by WA-209 (not verified)

This PSU proves there's no need for ATX PSUs anymore, which saves wasted space. You can run two 1080Ti cards and a high-end CPU from this PSU, which already is quite over the top. With more sensible hardware there's even a lot of room for overclocking.

Some brands have already started releasing mATX and ATX cases that support SFX PSUs only, like Silverstone, Lian-Li and Thermaltake, with more to come.

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