This article covers MSI MPG A1250GS PCIE5 PC電源ユニット 1250W ATX3.1.

Overview

MSI's MPG series brings us the A1250GS PCIE5, a fully modular 1250W power supply that complies with ATX 3.1 and PCIe 5.1 standards. It holds an 80 PLUS Gold certification, promising up to 90% efficiency at typical loads. The headline feature is a pair of native 12V-2x6 (16-pin) connectors, color-coded in yellow for a quick visual check on proper insertion. Built with 100% Japanese 105°C-rated capacitors, this unit is designed for long-term reliability, backed by a 10-year warranty. It's a strong candidate for anyone building a high-end gaming rig or workstation that demands stable power delivery for the latest GPUs.

Compatibility Guide

This is a standard ATX form factor PSU (150×150×86mm), fitting into most mid-tower and full-tower cases. The modular cable set includes: 1x ATX24-pin, 2x EPS4+4-pin, 2x PCI-E 5.1 16-pin (12V-2x6), 1x PCI-E 6+2-pin, 8x SATA, and 4x peripheral 4-pin connectors. The embossed jacket cables are flexible and easy to route, and the included cable organizer helps keep things tidy. Make sure your case has enough clearance for the 135mm fan and the rather deep 150mm body. If you're using an older motherboard without ATX 3.1 support, don't worry—the 24-pin and EPS connectors are fully backward compatible.

Product Info

Released in early 2023, the MSI MPG A1250GS PCIE5 currently retails for around ¥24,500 on Japan. It sits in the mid-high tier of the PSU market, offering a balance of efficiency, power, and modern connector support. The 135mm FDB fan ensures quiet operation under normal loads, and the nine protection circuits (OCP, OTP, OPP, SCP, OVP, UVP, SIP, NLO) cover all the bases. The key differentiator is the dual 12V-2x6 connectors, making it one of the few ATX 3.1 PSUs ready for multi-GPU setups with RTX 50-series cards.

Best Use Cases

High-end gaming: If you're planning a build with a top-tier GPU like the RTX 4090 or 5090, this PSU provides ample headroom and the correct connectors. The 1250W capacity also allows for overclocking both CPU and GPU without worry. However, for a single mid-range GPU (e.g., RTX 4070), a 750W unit would be more cost-effective.\n\n Content creation workstation: For prolonged rendering or video editing sessions that max out both CPU and GPU, the ATX 3.1 standard's transient response capability ensures stable voltage even during sudden power spikes. The extra wattage is also handy for powering multiple NVMe SSDs and water cooling pumps.\n\n* Future-proofing: If you plan to keep your system for 5+ years and may upgrade to more power-hungry components, this PSU's 10-year warranty and Japanese capacitors give you peace of mind. You won't need to replace the PSU for a long time, saving hassle and potential cable management rework.

Things to Consider

First, size matters: this is a standard ATX PSU, so it won't fit in small form factor cases that require SFX units. Second, 1250W is overkill for most builds. If you're using a single mid-range GPU and a mainstream CPU, you're paying for capacity you'll never use. Consider a 750W or 850W unit instead. Competitors like Seasonic Vertex GX-1200 and Corsair RM1000x offer similar specs and pricing; the MSI's advantage is the dual 12V-2x6 connectors. On the flip side, the efficiency is only Gold-rated, so if you run your PC 24/7, a Platinum or Titanium unit might save you more on electricity in the long run. Also, the fan is 135mm, which is slightly smaller than the 140mm fans found in some competing units—though in practice noise levels are still very low. ## FAQ
Q: Does this PSU support the RTX 5090?\nA: Yes, absolutely. It has two native 12V-2x6 connectors rated for 600W each, so it can handle one or even two RTX 5090s (if your motherboard supports multi-GPU). Just ensure each GPU's power draw stays within the cable's rating.\n\nQ: Can I use this with an older motherboard that only has a 24-pin ATX connector?\nA: Yes, compatibility is backward. The 24-pin main cable works with any ATX motherboard, and the EPS 4+4-pin cables will fit both 8-pin and 4+4-pin CPU power headers. The new 12V-2x6 connectors are only needed for modern GPUs; you can ignore them if you don't use them.\n\nQ: What is the warranty claim process?\nA: MSI provides a 10-year limited warranty. In case of failure, you need to contact MSI support with proof of purchase. The warranty covers defects in materials and workmanship but not damage from misuse, overclocking, or improper installation. Retain your invoice or order history.

Product Disclosure (Amazon)

  • Manufacturer: MSI
  • Seller: クリッパーズ
  • Fulfilled by: Amazon
  • ASIN: B0BSLLGJQ6
  • Note: This article covers a manufacturer-made product based on Amazon listing details.