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ASRock Steel Legend SL-1200P power supply review: Combines genuine Platinum efficiency with a winning stand-out design
The ASRock Steel Legend SL-1200P is a strong contender in the high-wattage modular PSU segment. It combines legitimate Platinum-tier efficiency, excellent ripple suppression, dual 12V-2x6 outputs, and a distinctive aesthetic at a price that is firm but interesting. A few thermal concerns at extreme loads and aggressive protection thresholds are the primary caveats.
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ASRock was founded in 2002 as a spin-off from Asus, originally tasked with producing value-oriented motherboards for cost-sensitive markets. Over the following two decades, it grew into a serious competitor across the motherboard and graphics card spaces, eventually expanding into monitors, mini PCs, and industrial compute platforms. The PSU market, however, was conspicuously absent from its catalog until recently, when the company announced a broad simultaneous launch of nearly twenty power supply models spanning four distinct series: Taichi, Phantom Gaming, Steel Legend, and Challenger. It was not a cautious entry at all. ASRock came in with a full lineup covering wattages from 550W to 1650W, certifications ranging from 80Plus Bronze to Titanium, and a ten-year warranty across its premium tiers, signaling a serious long-term commitment to the segment.
The Steel Legend PSU series sits in the middle of that hierarchy. The base "G" variants are Gold-certified, fully modular, and aimed at mainstream builders. The "P" variants, of which the SL-1200P is one, step up to Platinum efficiency and add higher wattage headroom, dual 12V-2x6 connectors, and a set of engineering refinements that make a valiant effort to justify the premium. With all its merits, the ASRock Steel Legend SL-1200P deserves a spot in our list of best power supplies.
The SL-1200P ships in a substantial cardboard box. The packaging uses a metallic stripe motif with a picture of the unit on the front, serious in tone and consistent with the Steel Legend branding. Inside, the PSU is wrapped in a protective pouch and surrounded by foam inserts.
The accessory bundle is genuinely good: mounting screws, an AC cable, cable ties, reusable cable straps, a jump-start adapter for bench testing, and clear cable combs. There is no full manual, but a concise quick-start installation guide covers what most users need.
The cables are immediately distinctive. Where virtually every other manufacturer ships black cables, ASRock chose grey per-wire sleeving with black connectors. It is a deliberate aesthetic decision and one that works well, particularly in lighter or open-frame builds. The two 12V-2x6 cables receive additional nylon sleeving and feature partially neon-green connectors. The green section disappears from view once the connector is properly seated, functioning as a simple visual confirmation of correct insertion.
More importantly, each 12V-2x6 cable carries an embedded temperature sensor with a two-pin connector that feeds back to the PSU. If the cable overheats, the unit shuts down. It is an inelegant solution to a problem that arguably should be handled at the connector standard level, but it is a functional one and preferable to doing nothing. Three 6+2 pin PCI Express connectors round out the cable configuration, and the total connector count for a 1200W unit is very good.
At 150 mm in length, the SL-1200P is marginally longer than the ATX specification recommends, but this should present no practical challenge in any quality modern case. The chassis is visually busy by PSU standards and is neither black or white – the SL-1200P is grey, much like its cables, making it visually unique amongst its competitors.
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