Overview

The Corsair SF Series has long been a go-to choice for small form factor PC builders, and the SF450 (model CP-9020181-NA) is a prime example of why. This 450W SFX power supply carries an 80 PLUS Platinum efficiency rating, meaning it wastes less energy as heat compared to Gold or Bronze units. It's fully modular, with individually sleeved cables that make cable management in tight spaces much easier.
A 92mm PWM fan handles cooling, and it features a Zero RPM mode that keeps the fan completely off under low to moderate loads. When the fan does spin up under heavy load, it remains impressively quiet. Inside, 105°C-rated Japanese capacitors ensure long-term reliability, backed by a 7-year warranty from Corsair.
This PSU is ideal for Mini-ITX and Micro-ATX builds where space is at a premium. Its 450W capacity is well-suited for mid-range CPUs paired with a single mid-range GPU, striking a good balance between power delivery and compactness.

Compatibility Guide

The SF450 conforms to the SFX form factor, so it fits directly into any case with an SFX mounting bracket. Most Mini-ITX cases and many Micro-ATX cases support SFX out of the box. An included SFX-to-ATX adapter plate lets you mount it in standard ATX cases as well.

  • There are no direct restrictions on CPU socket or memory type, but ensure your motherboard has the required EPS12V (CPU 8-pin) and ATX 24-pin connectors.
  • A 450W unit is a good match for CPUs with a TDP around 65W (e.g., Core i5, Ryzen 5) and GPUs with a TDP around 150W (e.g., GeForce RTX 4060, Radeon RX 7600).
  • For high-end GPUs (RTX 4080 class or above) or heavily overclocked systems, consider stepping up to the SF600 or SF750.

Product Info

The Corsair SF450 (CP-9020181-NA) launched in 2018 and sits in the mid-to-high-end segment of the SFX PSU market. Its key selling points are Platinum-level efficiency, full modularity, and a compact footprint.

  • Rated Output: 450W
  • Efficiency Certification: 80 PLUS Platinum (≥89% at 20-100% load on 115V input)
  • Form Factor: SFX (ATX compatible with included bracket)
  • Modular Type: Fully modular (individually sleeved cables)
  • Fan: 92mm PWM fan with Zero RPM mode
  • Protection: OVP, UVP, SCP, OTP, OPP
  • Warranty: 7 years
  • Availability: online retailers, Corsair official store, major PC parts retailers

Best Use Cases

  • Small Form Factor (SFF) Builders: Perfect for Mini-ITX and Micro-ATX cases where every millimeter counts. The SFX size and fully modular cables make assembly and cable routing much simpler.
  • Silence-Oriented Users: The Zero RPM fan mode means the PSU fan stays off during light workloads, creating a truly silent PC experience. Great for home theater PCs or quiet office machines.
  • Mid-Range Gaming/Creator PCs: A Core i5 or Ryzen 5 paired with a mid-range GPU like an RTX 4060 or RX 7600 will run comfortably on 450W, leaving some headroom for typical loads.
  • Secondary or Budget Builds: Ideal for a compact home server, a secondary gaming rig, or a low-power workstation where efficiency and reliability matter more than raw wattage.

Things to Consider

The SF450's 450W capacity is a limitation for high-end hardware. If you plan to use a Core i7/i9 or Ryzen 7/9 CPU alongside a power-hungry GPU like the RTX 4070 Ti SUPER or above, you should look at the SF600 or SF750 instead. Also, because SFX PSUs have shorter cables than ATX units, they may not reach all connectors in a full-tower ATX case, even with the included adapter. Competitors in this space include the SilverStone SST-SX500-LG (500W, Gold) and the Corsair SF600 (600W, Platinum). Price-wise, the SF450 is more expensive than entry-level 450W units, but the Platinum efficiency, modular design, and 7-year warranty justify the premium for those who value quality and longevity.

FAQ

Q: What cases is the SF450 compatible with?
A: It fits any case with an SFX mounting bracket. An included SFX-to-ATX adapter allows installation in standard ATX cases. However, cable length is shorter than ATX PSUs, so it may not reach in very large tower cases.
Q: What kind of gaming PC can I build with 450W?
A: A system with a 65W TDP CPU (e.g., Core i5-13400, Ryzen 5 7600) and a 150W TDP GPU (e.g., RTX 4060, RX 7600) will run comfortably. An RTX 4070 may also work with a power-efficient CPU, but we recommend the SF600 for more headroom.
Q: Does the Zero RPM mode work all the time?
A: No, the fan stops only under low loads (roughly below 20-30% of rated capacity). Under higher loads, the fan spins up automatically. The behavior is not user-configurable, but it ensures quiet operation during typical desktop use.

Product Disclosure (Amazon)

  • Manufacturer: CORSAIR
  • Seller: Kahala Market(輸入品専門店)
  • Fulfilled by: Kahala Market(輸入品専門店)
  • ASIN: B07F7SGJ82
  • Note: This article covers a manufacturer-made product based on Amazon listing details.