Silverstone SX800-LTI
- Wattage:
- 800 W
- 80 PLUS Rating:
- Titanium
- Modularity:
- Fully Modular
- ATX Standard:
- ATX 2.x
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Manufacturer: Silverstone Last updated: September 8, 2026
Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship) Review
The Silverstone SX800-LTI holds a genuinely rare distinction: at 800W, it's specifically noted as delivering unprecedented power output for the SFX-L form factor at the time of its design, a category where the very first enthusiast-focused units started at just 450W. Paired with 80 PLUS Titanium certification, the highest efficiency tier currently defined, this represents the top of what's achievable in a small form factor power supply as of this writing.
The Silverstone SX800-LTI holds a genuinely rare distinction: at 800W, it's specifically noted as delivering unprecedented power output for the SFX-L form factor at the time of its design, a category where the very first enthusiast-focused units started at just 450W. Paired with 80 PLUS Titanium certification, the highest efficiency tier currently defined, this represents the top of what's achievable in a small form factor power supply as of this writing.
Wattage and Efficiency
800W continuous output (850W peak) with 80+ Titanium certification delivers 90% to 94% efficiency across the 10% to 100% load range, genuinely exceptional numbers that exceed what most full-size ATX units achieve, packed into a footprint built specifically for small form factor cases. A single +12V rail rated at 66A reflects a clean, class-leading power delivery design for this form factor.
Fan Design and Noise
The 120mm fan, larger than the fans found on standard SFX units and part of what defines the SFX-L format's advantage, uses intelligent RPM control with a minimum 18dBA noise floor during active operation. Below 20% load, the unit switches to fully fanless semi-passive operation, meaning genuinely silent running during typical idle or light desktop use.
Modularity and Cabling
100% modular cabling using flexible flat cable arrays is specifically engineered for small form factor case constraints, where standard round cables can be considerably harder to route and tuck away cleanly given the limited internal volume.
Design and Build
All-Japanese capacitors and strict ±3% voltage regulation reflect genuine premium build quality, and a power density of 775W per liter is a real, measurable engineering achievement specifically relevant to the small form factor category, where every cubic centimeter of case volume matters.
Comparison to Sibling Products
Against a standard ATX unit like the Corsair RM850x, covered elsewhere on this site, this Silverstone model delivers comparable wattage in a dramatically smaller footprint specifically built for SFX-L-compatible small form factor cases, at a real price premium reflecting both the Titanium efficiency tier and the engineering required to fit this much capacity into a compact form factor. Within the small form factor category specifically, this remains one of the highest-wattage, highest-efficiency options available, a genuine flagship pick for anyone building a powerful small form factor system rather than compromising on capacity to fit a compact case.
Who This Power Supply Is Actually For
Small form factor builders who refuse to compromise on power capacity. This is specifically engineered to bring near-ATX-flagship wattage into an SFX-L case.
Buyers who want the highest available efficiency tier in a compact form factor. Titanium certification here is a genuine, rare achievement for this category.
Anyone building a powerful ITX-adjacent gaming or workstation system. 800W of Titanium-rated power comfortably covers demanding component pairings in a small case.
Not for standard ATX cases or builds without a genuine small-form-factor size constraint. A standard ATX unit, several covered elsewhere on this site, will be more cost-effective for a case with no space limitation.
Not for the most budget-conscious small form factor builds. Titanium efficiency and this wattage tier carry a real price premium over more modest SFX units.
Specifications
Identity
| Brand | SilverStone |
|---|---|
| Model Number | SX800-LTI |
Output and rails
| Single +12V Rail | Yes |
|---|
Form factor and fit
| Length | 130 mm |
|---|---|
| Colour | Black |
Cables
| Modularity | Fully Modular |
|---|
Monitoring, protection and price
| Protections | OCP, OVP, OPP, SCP, OTP, UVP |
|---|---|
| Price | 180 USD |
| Warranty | 3 years |
| Wattage | 800 W |
|---|---|
| 80 PLUS Rating | Titanium |
| ATX Standard | ATX 2.x |
| Form Factor | SFX-L |
| 12V-2x6 Connectors | 0 |
| Zero-RPM Mode | Yes |
| Sleeved Cables | No |
| PCIe 8-pin Connectors | 4 |
| Connector Count | 1x 24-pin, 1x EPS 8-pin, 4x PCIe 8-pin, 12x SATA, 3x Molex |
| Fan Size | 120 mm |
| Fan Model / Bearing | Globe Fan S1201512HB, 13-blade fluid dynamic bearing |
| OEM / Platform | Enhance Electronics |
| Japanese Capacitors | Yes |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Small form factor builders who refuse to compromise on power capacity. This is specifically engineered to bring near-ATX-flagship wattage into an SFX-L case.
- Buyers who want the highest available efficiency tier in a compact form factor. Titanium certification here is a genuine, rare achievement for this category.
- Anyone building a powerful ITX-adjacent gaming or workstation system. 800W of Titanium-rated power comfortably covers demanding component pairings in a small case.
Not for
- Not for standard ATX cases or builds without a genuine small-form-factor size constraint. A standard ATX unit, several covered elsewhere on this site, will be more cost-effective for a case with no space limitation.
- Not for the most budget-conscious small form factor builds. Titanium efficiency and this wattage tier carry a real price premium over more modest SFX units.
FAQs
What are the key specifications of the Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship)?
The Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship) is a power supply from Silverstone. Key specs: Wattage 800 W, 80 PLUS Rating Titanium, Modularity Fully Modular, ATX Standard ATX 2.x, 12V-2x6 Connectors 0.
Will the Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship) work with my current setup?
The Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship) lists Wattage is 800 W. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship) best suited to?
It suits small form factor builders who refuse to compromise on power capacity. this is specifically engineered to bring near-atx-flagship wattage into an sfx-l case., buyers who want the highest available efficiency tier in a compact form factor. titanium certification here is a genuine, rare achievement for this category., anyone building a powerful itx-adjacent gaming or workstation system. 800w of titanium-rated power comfortably covers demanding component pairings in a small case..
What are the drawbacks of the Silverstone SX800-LTI (SFX-L/800W/80+ Titanium/Fully Modular/Small Form Factor Flagship)?
It is a poor fit for not for standard atx cases or builds without a genuine small-form-factor size constraint. a standard atx unit, several covered elsewhere on this site, will be more cost-effective for a case with no space limitation., not for the most budget-conscious small form factor builds. titanium efficiency and this wattage tier carry a real price premium over more modest sfx units..
Compare and read more
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