# オウルテック 【80PLUS GOLD取得】 HASWELL対応 ATX電源ユニット新規採用FDB(流体軸受け)12cmファン 5年間交換保証セミモジュラーケーブル Seasonic G Series 550W SSR-550RMS > Owltech's Seasonic G Series SSR-550RMS is a 550W semi-modular ATX PSU with 80PLUS GOLD, Japa Tags: power_supply, seasonic, g-series, 80plus-gold, 550w, semi-modular Source: https://www.amazon.co.jp/dp/B00WJXBMO4 Article page: https://web-autoai.com/articles/80plus-gold-haswell-atxfdb12cm-5-seasonic-g-series-550w-ssr?lang=en Prices and ratings change over time — check the article page for the current values. --- ## Overview The Owltech-branded Seasonic G Series SSR-550RMS is a 550W ATX power supply with 80PLUS GOLD certification, built on Seasonic's proven platform. It uses high-quality Japanese 105°C electrolytic capacitors on both primary and secondary sides, significantly boosting long-term reliability. A fluid dynamic bearing (FDB) 120mm fan delivers quiet operation and extended lifespan, while the semi-modular cable design reduces clutter and improves airflow inside the case. This unit is also known as Haswell-ready, ensuring compatibility with modern C6/C7 sleep states. With 550W of continuous power, the SSR-550RMS is ideal for mid-range gaming PCs or content creation builds. A Core i5 or Ryzen 5 paired with an RTX 4060-class GPU runs comfortably within its limits. Backed by a 5-year replacement warranty and Japanese capacitor quality, this PSU offers exceptional value for budget-conscious builders who refuse to compromise on reliability. The G Series is a well-known global model from Seasonic, reviewed positively by numerous hardware outlets. Owltech acts as the authorized Japanese distributor, providing a local manual and domestic support—an extra layer of confidence for home users. ## Compatibility Guide This PSU conforms to the standard ATX form factor (approx. 160mm depth), fitting most mid-tower cases without issue. It provides a single EPS12V (4+4 pin) CPU connector, covering Intel LGA1700/1200/115x and AMD AM4/AM5 boards with one 8-pin input. High-end boards requiring 8+4 or 8+8 pin EPS power will need an adapter or a different unit. Two PCIe 6+2 pin cables support graphics cards with one or two 8-pin (or 6-pin) inputs. The PSU does not feature a native 12VHPWR connector; owners of RTX 40-series GPUs that use 12VHPWR must use the included adapter or a dedicated cable. Six SATA connectors and five 4-pin peripheral connectors provide ample storage and accessory power. A single FDD connector is also present. Haswell compatibility ensures stable operation with modern Intel and AMD sleep states. ## Product Info First released around 2015, the SSR-550RMS remains in active production, a testament to its lasting value. It sits at the entry-level end of the mid-range segment, balancing cost and dependability. Few competitors offer this feature set at such a low price point. ## Best Use Cases * Office PCs and media servers: High efficiency at low loads and a long-life FDB fan suit 24/7 operation. A GPU-less build could even use a lower wattage unit, but the G Series still shines in quietness and reliability. * Secondary or spare PCs: Perfect for cost-effective second computers, especially with an APU like Ryzen 5 or Core i5 without a discrete GPU. * Not recommended for: High-end gaming rigs equipped with Core i7+/Ryzen 7+ CPUs and RTX 4070 Ti or faster GPUs, as those systems typically require 650W or more. Also, users who demand fully modular cables or native 12VHPWR support should look elsewhere. ## Things to Consider The SSR-550RMS was designed before the ATX 3.0/3.1 specifications and lacks a native 12VHPWR connector. If you plan to use a GPU that mandates 12VHPWR (such as some RTX 40-series cards), you will need an adapter, which can complicate cable management. Additionally, the semi-modular design means the 24-pin ATX and 8-pin CPU cables are permanently attached. Enthusiasts who prize ultra-clean builds may prefer a fully modular unit. Power-wise, 550W is adequate for mid-range hardware, but a Core i7 + RTX 4070 combo could push the limit; a 650W or higher PSU would provide more headroom for peak loads and future upgrades. On the positive side, the PSU handles modern C6/C7 sleep states without issues, ensuring broad platform compatibility. ## FAQ Q: Can this PSU power an RTX 3060 Ti or RX 6700 XT? A: Yes, both cards have a recommended PSU rating of 550–600W, so the SSR-550RMS is sufficient. However, if paired with a high-tier CPU like a Ryzen 7 or Core i7, total system draw could exceed 500W. Always add a 50W safety margin when calculating your total power budget. Q: Where can I buy additional modular cables? A: The modular cables are proprietary to the Seasonic G Series. ### Product Disclosure (Amazon) - Manufacturer: オウルテック - ASIN: B00WJXBMO4 - Note: This article covers a manufacturer-made product based on Amazon listing details.