ASRock Steel Legend SL-1200P 1200W 80+ Platinum PSU
ASRock
ASRock Steel Legend SL-1200P 1200W 80+ Platinum PSU
The ASRock Steel Legend SL-1200P is a 1200W fully modular ATX3.1 power supply aimed at high-end PC builders who need certified efficiency, native GPU connector support, and long-term reliability. It delivers 80 PLUS Platinum and Cybenetics Platinum efficiency alongside a native 12V-2x6 connector with TempGuard temperature monitoring, making it a strong fit for systems built around current-generation graphics cards. A 10-year warranty backs the unit for builders who plan to keep their platform running for the long haul.
Why this product
80 PLUS Platinum and Cybenetics Platinum certified
It carries both 80 PLUS Platinum and Cybenetics Platinum efficiency ratings, plus a Cybenetics LAMBDA A noise certification, covering efficiency and acoustic performance in a single unit.
ATX3.1 and PCIe 5.1 ready
It meets the ATX3.1 specification and includes a native 12V-2x6 connector, so it is prepared for current and upcoming PCIe 5.1 graphics cards without adapters.
Native 12V-2x6 with TempGuard monitoring
The NTC sensor built into the VGA connector monitors temperature in real time and signals the PSU to intervene if conditions become unsafe, reducing risk at the GPU power connection.
Fully modular cable design
Every cable detaches from the unit, keeping unused cables out of the case and making airflow management straightforward during a build or upgrade.
iCool intelligent fan control
In iCool mode the 135mm FDB fan stays off under low to medium loads, reducing noise during everyday use and only spinning up when load or temperature rises.
10-year warranty
ASRock backs this unit with a 10-year warranty, one of the longer coverage periods in its class.
- Wattage1200W
- Efficiency Rating80 PLUS Platinum
- ATX StandardATX3.1
- GPU ConnectorNative 12V-2x6 with TempGuard
- Modular DesignFully Modular
- Fan Size135mm Striped Axial FDB
- Warranty10 Years
- SKUASR-2551
- EAN4711581492721
- Compatible with ATX3.1 motherboard form factor builds.
- Supports PCIe 5.1 graphics cards via native 12V-2x6 connector — no adapter required.
- Fully modular cabling is compatible with standard ATX case builds where cable management matters.
- Cybenetics certification badge may be absent from some earlier unit packaging; the certification itself applies to the product regardless.
- iCool fan-off mode is user-selectable; buyers who prefer continuous fan operation can switch iCool off and the fan will run at all times.
Best for
- High-end gaming or workstation builds that pair a demanding current-generation GPU with a platform requiring reliable, high-wattage power delivery.
- Builders prioritising efficiency who want both 80 PLUS Platinum and Cybenetics Platinum ratings to reduce running costs and heat output.
- Long-term platform owners who want a 10-year warranty so the PSU can outlast multiple GPU and CPU upgrade cycles.
- Noise-conscious builders who benefit from the iCool fan-off mode during lighter workloads, keeping the system quieter at idle and under moderate load.
- Tidy cable-management builds where a fully modular design allows unused cables to be left out of the case entirely.
Trade-offs
- Budget-focused builds — at 1200W with Platinum certification, a 10-year warranty, and a fully modular design, this unit carries a corresponding price that exceeds what entry-level or mid-range builds typically require.
- Low-power or compact systems — 1200W is well above the needs of a basic office PC or an ITX small-form-factor build, where a lower-wattage unit would be a better fit.
- Buyers who require a semi-modular option — this is a fully modular design, meaning all cables must be connected at both ends; there are no permanently attached cables for builders who prefer a semi-modular setup.
SL-1200P
- 80 PLUS® PLATINUM Certified
- Cybenetics PLATINUM and LAMBDA A Certified*
- ATX3.1 & PCIe5.1 Ready
- Fully Modular Cable Design
- Native 12V-2x6 Connector Dual Color Design with TempGuard
- 100% Highly Reliable Japanese Capacitors
- 135mm Striped Axial FDB Fan
- iCool Intelligent Fan Control Mode
- Built-in 5V BOOST function
- Remarkable 10-Year Warranty
*The Cybenetics certification on the packaging has been updated. Some earlier units may not show the badge. For the latest certification details, please visit the official Cybenetics website. Product specifications and performance remain unchanged.
With ASRock Classic Green connectors, users can easily see if the connector has been plugged properly. The NTC sensor at the VGA connector monitors the temperature and sends signal the PSU to ensure safe operation.
●iCOOL Mode ON: The power supply runs more efficiently. The fan stays off during low to medium loads, reducing noise and improving energy efficiency. The fan only activates when the load or temperature increases.
●iCOOL Mode OFF: The fan runs continuously, regardless of load.
General
| Brand | ASRock |
|---|---|
| Model | SL-1200P |
| Wattage | 1200W |
| Modular Design | Fully Modular |
| ATX Standard | ATX3.1 |
| Warranty | 10 Years |
Efficiency & Certification
| 80 PLUS Rating | Platinum |
|---|---|
| Cybenetics Efficiency | Platinum |
| Cybenetics Noise | LAMBDA A |
Connectivity
| GPU Connector | Native 12V-2x6 with TempGuard |
|---|---|
| PCIe Standard | PCIe 5.1 Ready |
| Connector Feature | ASRock Classic Green (plug-confirmation colour coding) |
Cooling & Components
| Fan Size | 135mm Striped Axial FDB |
|---|---|
| Fan Control | iCool Intelligent Fan Control Mode |
| Capacitors | 100% Japanese Capacitors |
| Special Function | Built-in 5V BOOST |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.