6 Best Alternatives to the Seasonic Focus V4 GX-1000 1000W (2026)

How each alternative compares

Seasonic Focus V3 1000W Gold ATX Power Supply

The Seasonic Focus V3 1000W is the direct predecessor to the V4. It shares the same 1000W output, 80 Plus Gold efficiency, and fully modular design. The dimensions are identical, measuring 5.9 by 3.4 by 5.5 inches. You get the same 10-year warranty and ATX 3.0 compliance. The main difference is the internal architecture. The V4 introduces the OptiSink design and a newer fan control algorithm. If you do not need the latest thermal management features, the V3 offers the same core reliability. It is a solid choice if you find it at a different price point, but the V4 remains the more modern option for new builds.

GAMEMAX 1050W ATX 3.0 ARGB Power Supply

The GAMEMAX 1050W ATX 3.0 PSU offers higher wattage at 1050W. It also carries an 80 Plus Gold rating and full modularity. However, it is significantly larger than the compact Seasonic. The GAMEMAX measures 10.3 by 5.24 by 11.4 inches, which is nearly double the length of the 5.5-inch Seasonic. It also features ARGB lighting, which the Seasonic lacks. This unit is best for users who prioritize extra headroom and aesthetic customization over compact form factors. It suits white-themed builds well. If your case cannot accommodate a large power supply, this option will not fit. It trades the Seasonic’s small footprint for higher power and visual flair.

MSI MAG 1000W Gold Modular Power Supply

The MSI MAG 1000W Gold Modular Power Supply supports the newer ATX 3.1 standard and PCIe 5.1. It provides a 12V-2x6 connector like the Seasonic. However, it is much larger, measuring 9.25 by 5 by 11.5 inches. The Seasonic is compact at 5.5 inches long. The MSI unit weighs 7.25 pounds. It offers a 10-year warranty and is fully modular. This PSU is ideal for users with standard ATX cases who do not need a compact unit. It provides modern connectivity standards. If you have space constraints, the MSI is too large. It is a good alternative for high-end gaming builds where size is not a limiting factor.

MSI 1000W Fully Modular Gold PSU

The MSI MPG A1000GS is another ATX 3.1 option with PCIe 5.1 support. It delivers 1000W with 80 Plus Gold efficiency. It is fully modular and includes a 12V-2x6 connector. The physical size is 9.5 by 5.4 by 11.5 inches, making it significantly larger than the compact Seasonic Focus V4. It weighs 8.82 pounds. This unit is designed for standard ATX cases. It is suitable for gamers who need modern connector support and do not mind a larger power supply. The Seasonic is better for small form factor builds. Choose this MSI model if you prioritize the latest ATX 3.1 standard and have ample space in your chassis.

MSI MAG 1000W White Modular Power Supply

The MSI MAG A1000GL White is an ATX 3.1 power supply with PCIe 5.1 support. It offers 1000W of power with 80 Plus Gold efficiency. It is fully modular and includes a 12V-2x6 connector. The unit measures 9.25 by 5.08 by 11.5 inches and weighs 7.54 pounds. It comes in a white color, which matches white-themed builds. The Seasonic Focus V4 is much smaller at 5.5 inches long. This MSI unit is ideal for users who want a white aesthetic and modern standards. It is not suitable for compact cases. If you need a standard-sized, white power supply with ATX 3.1 compliance, this is a strong alternative to the compact Seasonic option.

MSI MAG 850W Fully Modular ATX Power Supply

The MSI MAG 850W Fully Modular ATX Power Supply offers 850W of power, which is less than the 1000W Seasonic. It supports ATX 3.1 and PCIe 5.1 standards. It is fully modular and includes a 12V-2x6 connector. The unit measures 8.75 by 4.92 by 12 inches. It is larger than the compact Seasonic in length. This model is suitable for users who do not need the full 1000W capacity. It provides modern connectivity in a slightly smaller wattage package. It carries a 10-year warranty. If your system does not require 1000W, this 850W unit is a cost-effective alternative. It is best for budget-conscious gamers who still want ATX 3.1 support.

Quick picks

Our 7 picks

1 Best overall

Seasonic Focus V4 GX-1000 1000W PSU

Best for: modern ATX 3 builds needing 1000W power

Wattage

1000W

Efficiency Rating

80 PLUS Gold

Modularity

Full-Modular

ATX Version

ATX 3

PCIe Connector Type

12V-2x6

Fan Size

135 mm

View on Amazon: Seasonic Focus V4 GX-1000 1000W PSU Affiliate link

The Seasonic Focus V4 1000W Gold PSU is a fully modular ATX 3 power supply delivering 1000W of output with 80 PLUS Gold efficiency. It includes a 135 mm fluid dynamic bearing fan with hybrid silent control and a 16-pin 12V-2x6 PCIe Gen 5 cable. The 140 mm length fits standard ATX cases. This unit suits you if you build an ATX system requiring dedicated Gen 5 graphics power.

Pros

• 1000W output with 80 PLUS Gold efficiency
• ATX 3 compliant with 16-pin 12V-2x6 PCIe Gen 5 connector
• 135 mm fluid dynamic bearing fan with hybrid silent control
• Fully modular design with compact 140 mm depth
• Japanese 105 °C capacitors with 10-year warranty coverage

Cons

• 80 PLUS Gold efficiency rather than Platinum or Titanium ratings
• Total chassis weight reaches 6.6 pounds

Good fit if

• You need 1000W capacity for ATX 3 and PCIe Gen 5 hardware.
• You want a compact 140 mm fully modular power supply.

Skip if

• You require 80 PLUS Platinum or Titanium efficiency levels.
• You build a lower-draw PC that does not require 1000W.

Verdict: Seasonic Focus V4 1000W Gold PSU delivers 1000W of fully modular ATX 3 power with dedicated 12V-2x6 connectivity in a compact 140 mm casing. It provides durable operation backed by Japanese 105 °C capacitors and a 10-year warranty.

2 Also great

Seasonic Focus V3 1000W Gold ATX Power Supply

Best for: Users needing 1000W with 10-year warranty

Wattage

1000W

Efficiency Rating

80 PLUS Gold

Modularity

Full-Modular

ATX Version

ATX 3.0

PCIe Connector Type

12VHPWR

Fan Size

135 mm

View on Amazon: Seasonic Focus V3 1000W Gold ATX Power Supply Affiliate link

The Seasonic Focus V3 GX-1000 delivers 1000W of power with 80 PLUS Gold efficiency. It supports ATX 3.0 and includes the 12VHPWR cable for PCIe 5.0 GPUs. The unit features a 135 mm fan and fully modular cabling. You get a 10-year warranty with this compact 140 mm unit. It suits users needing reliable high-wattage support for modern graphics cards.

Pros

• 1000W output capacity
• 80 PLUS Gold efficiency rating
• ATX 3.0 and 12VHPWR support
• 10-year warranty coverage
• Compact 140 mm size

Cons

• Older V3 generation design
• Heavier than some competitors
• 135 mm fan size

Good fit if

• You need 1000W for high-end GPUs
• You want a 10-year warranty
• You prefer 80 PLUS Gold efficiency

Skip if

• You require the latest V4 model
• You need 80 PLUS Platinum efficiency
• You want a smaller 120 mm fan

Verdict: Seasonic Focus V3 GX 1000W is a solid choice for builders needing 1000W with a 10-year warranty, though it lacks the newer V4 architecture found in the guide's top pick.

3 Also great

GAMEMAX 1050W ATX 3.0 ARGB Power Supply

Best for: White gaming builds with RGB needs

Wattage

1050W

Efficiency Rating

80 Plus Gold

Modularity

Fully Modular

ATX Version

ATX 3.0

PCIe Connector Type

12VHPWR 16pin

Fan Size

140mm

View on Amazon: GAMEMAX 1050W ATX 3.0 ARGB Power Supply Affiliate link

The GAMEMAX 1050W unit delivers 80 Plus Gold efficiency and ATX 3.0 compatibility. It features a 140mm fan and fully modular cabling. The white chassis includes addressable RGB lighting that syncs with motherboards. This 1050W capacity suits high-end builds. You get a 10-year warranty and stable DC-DC output structure for demanding components.

Pros

• 1050W output capacity
• 80 Plus Gold efficiency rating
• ATX 3.0 and PCIe 5.0 ready
• 10-year warranty
• Fully modular design

Cons

• ARGB lighting adds visual complexity
• Larger 140mm fan size
• White color limits stealth builds

Good fit if

• You need 1050W for future GPUs
• You want ARGB motherboard sync
• You prefer a white case interior

Skip if

• You need a black PSU only
• You want a compact 120mm fan
• You dislike RGB lighting effects

Verdict: GAMEMAX 1050W ATX 3.0 Gold PSU fits users who want extra wattage and lighting sync. It suits white-themed gaming rigs needing ATX 3.0 support.

4 Also great

MSI MAG 1000W Gold Modular Power Supply

Best for: high-end gaming builds with standard cases

Wattage

1000W

Efficiency Rating

80 PLUS GOLD

Modularity

Fully modular

ATX Version

ATX 3.1

PCIe Connector Type

12V-2x6

Warranty

10-year

View on Amazon: MSI MAG 1000W Gold Modular Power Supply Affiliate link

The MSI MAG A1000GL is a fully modular 1000W power supply with 80 Plus Gold efficiency. It supports ATX 3.1 and PCIe 5.1 standards with a 12V-2x6 connector. The unit measures 11.5 by 9.25 by 5 inches and weighs 7.25 pounds. It includes a 10-year warranty. This model suits gamers needing reliable high-wattage support for modern graphics cards.

Pros

• 1000W output capacity
• 80 Plus Gold efficiency rating
• ATX 3.1 and PCIe 5.1 ready
• 12V-2x6 connector included
• 10-year limited warranty

Cons

• Black color option only
• Standard ATX form factor size
• No white color variant listed

Good fit if

• You need a 1000W power supply for high-end gaming builds
• You require ATX 3.1 and PCIe 5.1 compatibility
• You prefer a fully modular design for cleaner cable management

Skip if

• You need a white power supply for a white-themed case
• You require a compact or SFX form factor
• You are building a system that needs less than 850W

Verdict: MSI MAG A1000GL 1000W Gold fits users who need a standard-sized, black modular unit with modern PCIe 5.1 support and a long warranty.

5

MSI 1000W Fully Modular Gold PSU

Best for: Standard ATX gaming builds needing PCIe 5.1

Wattage

1000W

Efficiency Rating

80+ Gold

Modularity

Fully Modular

ATX Version

ATX 3.1

PCIe Connector Type

12V-2x6

Warranty

10 Year

View on Amazon: MSI 1000W Fully Modular Gold PSU Affiliate link

The MSI MPG A1000GS is a fully modular 1000W power supply built for high-end gaming builds. It meets the ATX 3.1 standard and supports PCIe 5.1 via dual 12V-2x6 connectors. The unit uses Japanese 105°C capacitors and offers industrial-level protections. You get an 80 Plus Gold efficiency rating and a 10-year warranty. This model fits systems requiring modern GPU connectivity and stable power delivery.

Pros

• ATX 3.1 standard with PCIe 5.1 support
• Dual 12V-2x6 connectors for modern GPUs
• 10-year warranty coverage
• 80 Plus Gold efficiency rating
• Industrial-level protection features

Cons

• Larger physical dimensions compared to compact alternatives
• Heavier build at 8.82 pounds
• Black color only available

Good fit if

• You need ATX 3.1 compatibility for future-proofing
• You require dual 12V-2x6 connectors for high-end graphics cards
• You want a 10-year warranty for long-term reliability

Skip if

• You need a compact form factor for small cases
• You prefer white components for a themed build
• You require more than 1000W of power output

Verdict: MSI MPG A1000GS ATX 3.1 1000W suits gamers needing modern PCIe 5.1 support and a long warranty. It is a solid choice for standard ATX cases where size is not a constraint.

6 Best premium

MSI MAG 1000W White Modular Power Supply

Best for: White-themed ATX 3.1 builds

Wattage

1000W

Efficiency Rating

80 PLUS Gold

Modularity

Fully Modular

ATX Version

ATX 3.1

PCIe Connector Type

12V-2x6

Warranty

10 Year

View on Amazon: MSI MAG 1000W White Modular Power Supply Affiliate link

This 1000W power supply features 80 PLUS Gold efficiency and ATX 3.1 compliance. It includes a native PCIe 5.1 12V-2x6 connector for modern graphics cards. The fully modular design uses flat cables for easier building. It measures 11.5 by 9.25 by 5.08 inches and weighs 7.54 pounds. This unit suits builders needing a white-themed, compact PSU with high efficiency and up-to-date connectivity standards.

Pros

• 80 PLUS Gold efficiency rating
• ATX 3.1 and PCIe 5.1 ready
• Native 12V-2x6 connector
• Fully modular with flat cables
• 10-year warranty

Cons

• White color limits compatibility with dark cases
• No mention of app or software control
• Heavier than some compact alternatives

Good fit if

• You want a white-themed build
• You need ATX 3.1 and PCIe 5.1 support
• You prefer fully modular flat cables

Skip if

• You need a black PSU
• You require smart monitoring features
• You want the smallest possible form factor

Verdict: MSI MAG A1000GL White 1000W delivers modern connectivity and high efficiency for white-themed builds. It fits users who prioritize ATX 3.1 standards and clean cable management.

7 Best budget

MSI MAG 850W Fully Modular ATX Power Supply

Best for: budget-conscious gaming rigs needing ATX 3.1 support

Wattage

850W

Efficiency Rating

80+ Gold

Modularity

Fully Modular

ATX Version

ATX 3.1

PCIe Connector Type

12V-2x6

Warranty

10 Year

View on Amazon: MSI MAG 850W Fully Modular ATX Power Supply Affiliate link

This ATX power supply delivers 850W with an 80 Plus Gold efficiency certification and a fully modular cable layout. It adheres to the newer ATX 3.1 and PCIe 5.1 standards and includes a native 12V-2x6 connector for modern graphics cards. If your hardware does not demand the full 1000W output of higher-tier alternatives, this unit provides long-term reliability backed by a 10-year warranty for modern gaming rigs.

Pros

• ATX 3.1 and PCIe 5.1 compliant
• Includes a native 12V-2x6 connector
• 80 Plus Gold efficiency rating
• Fully modular cable design
• 10-year manufacturer warranty

Cons

• Lower 850W capacity than 1000W alternatives
• Efficiency capped at 80 Plus Gold

Good fit if

• You need native ATX 3.1 and PCIe 5.1 support with a 12V-2x6 connector.
• You want a fully modular power supply backed by a 10-year warranty.
• You run a gaming system requiring no more than 850W.

Skip if

• You require 1000W or greater output for heavy power loads.
• You prefer an efficiency certification higher than 80 Plus Gold.

Verdict: MSI MAG 850W Fully Modular Power Supply delivers current ATX 3.1 and PCIe 5.1 standards in an 850W package. It suits gamers who want modern connector support and a 10-year warranty without needing a full 1000W capacity.

Specifications side by side

Frequently asked questions

See also

• razer blackwidow v4 pro mechanical alternatives
• ktaxon 48v 1000w ebike conversion alternatives