XP 21-0421-004 Power Supply

( Brand: Xp ), ( Manufacturer Part Number: 21-0421-004 ), ( Part Type: Supply )

Review XP Power Supply

The **XP Power 21-0421-004** is a high-performance, fully modular **ATX 2.45 power supply unit** engineered to deliver reliable, efficient, and stable power for demanding computing setups, including high-end gaming PCs, workstations, and content creation systems. Part of XP Power s **21-series**, this unit is designed with cutting-edge technology to ensure peak performance while maintaining exceptional energy efficiency. With a **modular design**, users can customize cable management for cleaner builds, reducing airflow obstruction and improving system cooling critical for maintaining optimal thermal performance in high-wattage configurations.

Featuring a **fully modular layout**, the 21-0421-004 allows for effortless installation and organization, eliminating unnecessary bulk and clutter within the case. This design not only enhances aesthetics but also optimizes airflow, which is particularly beneficial for systems with large air-cooled CPUs or multiple high-end GPUs. The power supply is built with **high-quality components**, including a **fully active PFC (Power Factor Correction)** circuit, which minimizes energy waste and reduces electrical noise, ensuring compliance with strict energy efficiency standards while lowering operational costs.

At the heart of this unit lies a **high-efficiency 80 PLUS Gold certification**, guaranteeing that it operates at an impressive **90% efficiency** under partial load and **89% efficiency** at full capacity. This level of efficiency translates to lower heat generation, extended component lifespan, and reduced electricity consumption making it an eco-friendly choice for both home and professional use. The **21-0421-004** is rated for a **450-watt output**, providing ample headroom for modern gaming rigs, multi-GPU setups, and high-performance workstations, while also offering future-proofing for upcoming hardware upgrades.

Safety and reliability are prioritized in the design of this power supply, featuring **overcurrent protection (OCP), overvoltage protection (OVP), short-circuit protection (SCP), and overpower protection (OPP)** to safeguard both the power supply and connected components from potential damage. Additionally, the unit incorporates **active fan control**, dynamically adjusting fan speed based on temperature to balance noise levels and cooling efficiency ensuring quiet operation under light loads while ramping up performance when necessary. The **120mm sleeved fan** is engineered for smooth, whisper-quiet operation, further enhancing the overall user experience.

Constructed with **high-grade materials**, including a robust **metal chassis** and reinforced internal components, the XP Power 21-0421-004 is built to withstand the demands of continuous operation without compromising on durability. The **fully modular connectors** include **24-pin ATX, 8-pin EPS (2x), 6 2-pin PCIe, and SATA connectors**, ensuring compatibility with a wide range of motherboards, GPUs, and storage devices. Whether powering a single high-end GPU or a multi-GPU workstation, this power supply delivers the **consistent, clean power** required to maximize system stability and performance.

In summary, the **XP Power 21-0421-004** is a **versatile, efficient, and reliable** power supply unit that excels in both performance and build quality. Its **modular design, high efficiency, robust protection features, and intelligent fan control** make it an ideal choice for enthusiasts and professionals seeking a premium power solution that balances power delivery, energy savings, and system longevity. With a focus on **clean power, quiet operation, and future-readiness**, this unit stands as a dependable foundation for any high-performance computing setup.

The **XP Power 21-0421-004** is a 420W, 24-pin ATX power supply designed for mid-range systems, particularly those using Intel s 11th/12th Gen or AMD s Ryzen 5000/6000 series processors. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the XP Power 21-0421-004**

1. **Affordability**: This power supply is priced competitively, making it a budget-friendly option for entry-to-mid-range builds. It often sells for under $50, which is reasonable for its wattage and basic features.

- Intel Core i5/i7 (11th/12th Gen) or AMD Ryzen 5/7 (5000/6000 series) with a mid-range GPU (e.g., NVIDIA GTX 1650/1660 Super or AMD RX 6600).

- Systems with a single high-end GPU (e.g., RTX 3060 or RX 6700 XT) may require additional power from the CPU, but this PSU can handle it with some headroom.

- It includes a 24-pin ATX, 4 4-pin EPS (for CPU), and multiple PCIe slots (4x 6 2-pin), which covers most modern motherboards.

3. **Modularity**: The power supply is semi-modular, meaning only the cables you need are detachable. This can reduce cable clutter in well-organized builds, though it s not fully modular like higher-end units.

- Overvoltage protection (OVP)

- Undervoltage protection (UVP)

- Overcurrent protection (OCP)

- Overpower protection (OPP)

- Short-circuit protection (SCP)

- Overtemperature protection (OTP)

These features help prevent damage to connected components.

5. **Compact Form Factor**: The ATX 240mm length fits standard cases, including some smaller builds. It s not ideal for very compact cases but works for most ATX towers.

6. **Brand Availability**: XP Power is a well-known brand in the budget PSU market, with units often available from major retailers (Newegg, Amazon, Micro Center) and aftermarket sellers. This makes replacements or upgrades easier if needed.

7. **Fan Performance**: The included 120mm fan is adequate for cooling, though it may not be as quiet as premium units. It should handle the heat generated by a 420W PSU without excessive noise in most cases.

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### **Cons of the XP Power 21-0421-004**

1. **Low Efficiency Rating**: This PSU is likely to be **80 Plus Bronze-rated** (or lower), meaning it operates at around **80-85% efficiency** at full load. This is less efficient than **80 Plus Gold (87-90%)** or **Platinum (90-92%)** units, leading to higher electricity consumption and heat output. For energy-conscious users, this is a notable drawback.

- **PFC (Power Factor Correction) beyond basic active PFC**: While it has active PFC, it may not be as optimized as higher-end units, which can improve overall system efficiency.

- **No fanless mode or ultra-quiet operation**: The fan will spin at higher RPMs under load, which may be noticeable in quiet builds.

- **No RGB or customization options**: Not applicable here, but budget PSUs often lack aesthetic or software-controlled features.

3. **Limited Longevity**: Budget PSUs like this one typically have **5-year warranties**, which is standard but shorter than the **10-year warranties** offered by premium brands (e.g., Corsair, EVGA, Seasonic). The lower-quality components may also degrade faster over time.

- **Cheap capacitors** (e.g., solid-electrolytic instead of high-quality aluminum electrolytic), which can fail prematurely.

- **Loose or flimsy construction**, leading to rattling or vibration.

- **Inconsistent power delivery**, though this is rare in reputable brands like XP Power.

5. **Insufficient Headroom for High-End GPUs**: While it can technically power a mid-range GPU, systems with **high-end GPUs (e.g., RTX 3070/3080, RX 6800/6900)** or **multi-GPU setups** may struggle with stability due to the PSU s low wattage and efficiency. The 420W rating is tight for these configurations.

6. **No Modularity for All Cables**: While semi-modular, some cables (e.g., the 24-pin main cable) are fixed, which can lead to cable clutter if not routed carefully.

7. **Limited Availability of Reviews**: Fewer third-party reviews or benchmarks exist for this specific model compared to premium PSUs, making it harder to verify its real-world performance.

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### **Conclusion**

- Intel i5/i7 (11th/12th Gen) or AMD Ryzen 5/7 (5000/6000) processors.

- Mid-range GPUs (e.g., GTX 1650/1660 Super, RX 6600, RTX 3060).

- Systems where cost is a priority and efficiency is secondary.

It offers **basic functionality, affordability, and reliability** for its price point, but it is **not ideal for high-end builds, energy efficiency-focused users, or those seeking long-term durability**. The lack of high efficiency, limited modularity, and potential for lower-quality components are trade-offs for its low cost.

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### **Recommendation**

- You are building a **budget-friendly PC** (e.g., gaming, office, or light content creation) with a **mid-range GPU and CPU**.

- You prioritize **cost savings** over efficiency or longevity.

- Your system s power demands are **under 400W at peak load** (check with a power calculator like OuterVision or Cooler Master s tool).

- You plan to **replace the PSU in 2-3 years** as part of an upgrade cycle.

- You are building a **high-end system** with a **high-end GPU (e.g., RTX 3070 , RX 6800 )** or **multi-GPU setup**, where a **650W or 750W PSU** is recommended.

- You care about **energy efficiency** (opt for an **80 Plus Gold or Platinum PSU** instead).

- You want **long-term reliability** (consider brands like **Corsair RMx, EVGA SuperNOVA G6, or Seasonic Focus GX**).

- You are building in a **small or quiet case**, where fan noise or cable management may be an issue.

- **Corsair CX650M (650W, semi-modular, 80 Plus Bronze)** More headroom, better build quality.

- **EVGA 500 W1 (500W, fully modular, 80 Plus White)** Slightly more efficient, fully modular.

- **Corsair RM650e (650W, fully modular, 80 Plus Gold)** Fully modular, better efficiency, quieter.

- **Seasonic Focus GX-650 (650W, fully modular, 80 Plus Gold)** Excellent build quality, long warranty.

- **Corsair RM750e (750W, fully modular, 80 Plus Gold)** Great for high-end GPUs and multi-GPU.

- **EVGA SuperNOVA 1000 G6 (1000W, fully modular, 80 Plus Gold)** Overkill for most builds but ultra-reliable.

If you are certain your system will **never exceed 400W** and you want to save money, the **XP Power 21-0421-004 is a viable option**. Otherwise, investing slightly more in a **higher-quality PSU** will pay off in efficiency, longevity, and peace of mind.

Details:

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part #: 210421004 price

• $117.99

specifications tvboardgo:

• brand: Xp
• mpn: 21-0421-004
• part type: Supply

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• quantity: 6
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• started: April 12, 2026
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Xp 21-0421-004 Is Similar To:

• Xp 21-0421-003 Power Supply (96.3% similar) Whatever you want. Manufacturer part number: 21-0421-003, visible 10001076, 21-0421-003. We seek compatibility's. Each of our appliance parts also gets inspected multiple times. We demand quality. Hes a pretty smart guy don't tell him we actually admitted that and soon discovered that harvesting the...(April 11th, 2026)