3 Best GAMEMAX PC Power Supplies Under $100, Compared

Quick picks

The best fit for you

• You build a high-performance gaming PC GAMEMAX 850W Gold ATX 3.0 Its ATX 3.0 standard and 80 Plus Gold efficiency suit modern NVIDIA 40-series GPUs.
• You need a compact budget power supply GAMEMAX GS Series 650W SFX PSU The SFX form factor and 650W output fit small builds without demanding extreme wattage.
• You have a small case needing high power GAMEMAX 850W SFX Gold Power Supply This 850W SFX unit delivers high power density for compact cases with modern GPUs.

Our 3 picks

1 Best overall

GAMEMAX 850W Gold ATX 3.0

Best for: high-performance gaming PCs with NVIDIA 40-series GPUs

Wattage

850W

Efficiency Rating

80 Plus Gold

Modularity

Fully Modular

ATX Version

ATX 3.0

Fan Size

140mm

Warranty

5-year

View on Amazon: GAMEMAX 850W Gold ATX 3.0 Affiliate link

This GAMEMAX power supply delivers 850W of power with 80 Plus Gold efficiency, meaning it wastes less energy as heat. It supports ATX 3.0 and PCIe 5.0 standards, which helps it handle high-power graphics cards without issues. The fully modular design lets you connect only the cables you need, keeping your build tidy. A 140mm fan keeps things cool and quiet.

Pros

• 80 Plus Gold efficiency rating for reduced heat and energy use
• ATX 3.0 and PCIe 5.0 ready for modern GPUs
• Fully modular cable design for cleaner builds
• 140mm fan for quiet operation
• Uses 100% Japanese capacitors for stability

Cons

• Large dimensions may not fit small cases
• ARGB lighting requires motherboard software support
• Limited to 5-year warranty period

Good fit if

• You are building a high-end PC with an NVIDIA 40-series GPU
• You need high efficiency to reduce heat in your case
• You want a fully modular PSU for cable management

Skip if

• You are using a small form factor case with limited space
• You need a PSU with a longer than 5-year warranty
• You prefer a non-RGB power supply

Verdict: GAMEMAX 850W ATX 3.0 Gold PSU is a strong choice for gamers building with modern high-performance graphics cards who need reliable power delivery and efficient cooling.

2 Best budget

GAMEMAX GS Series 650W SFX PSU

Best for: small form factor builds under 650W

Wattage

650W

Efficiency Rating

80 Plus Gold

Modularity

Full Modular

Form Factor

SFX

View on Amazon: GAMEMAX GS Series 650W SFX PSU Affiliate link

This GAMEMAX unit is a 650W SFX power supply with full modularity and 80 Plus Gold efficiency. The compact SFX form factor fits small cases where standard ATX units do not fit. Full modularity lets you connect only the cables you need, reducing clutter. The 650W output suits mid-range builds that do not require high-end graphics cards. It offers reliable power delivery in a dense package.

Pros

• 650W continuous power output
• 80 Plus Gold efficiency rating
• Full modular cable design
• Compact SFX form factor

Cons

• Lower 650W wattage compared to 850W competitors
• SFX size limits compatibility with standard ATX cases
• No mention of ATX 3.0 or PCIe 5.0 support

Good fit if

• You are building a small form factor PC
• You need efficient power for mid-range components
• You want clean cable management in a tight space

Skip if

• You require high-end GPU power for heavy gaming
• You are using a standard ATX mid-tower case
• You need the latest PCIe 5.0 native support

Verdict: GAMEMAX GS Series 650W SFX Gold is a compact, efficient choice for small builds that do not demand extreme power levels. It fits users prioritizing space and efficiency over maximum wattage.

3 Best premium

GAMEMAX 850W SFX Gold Power Supply

Best for: small cases needing high wattage

Wattage

850W

Efficiency Rating

80 Plus Gold

Modularity

Full Modular

ATX Version

ATX 3.0

PCIe Connector Type

12VHPWR

Form Factor

SFX

View on Amazon: GAMEMAX 850W SFX Gold Power Supply Affiliate link

This GAMEMAX unit is an 850W SFX power supply with full modularity and 80 Plus Gold efficiency. It supports ATX 3.0 and PCIe 5.0 standards, featuring a 12VHPWR connector for high-end graphics cards. The design uses Japanese capacitors and an FDB fan for stability and quiet operation. You get robust protection against voltage and temperature spikes. It fits small form factor builds needing high wattage.

Pros

• 80 Plus Gold efficiency rating
• Full modular cable design
• ATX 3.0 and PCIe 5.0 ready
• Includes 12VHPWR connector

Cons

• SFX form factor limits case compatibility
• Higher wattage in small size may increase noise
• No mention of cable length specifications

Good fit if

• You need 850W in a small SFX case
• You use PCIe 5.0 graphics cards
• You want high efficiency in a compact build

Skip if

• You require ATX standard size
• You need non-modular cables
• You are building a low-power system

Verdict: GAMEMAX 850W SFX Gold PSU delivers high power density for compact builds. It suits users with small cases and modern GPUs requiring PCIe 5.0 support.

Specifications side by side

How to choose the right GAMEMAX PSU

1. Check the ATX standard

   Modern GPUs often require new power connectors. The GAMEMAX 850W Gold ATX 3.0 supports the latest ATX 3.0 specification. This standard includes native support for PCIe 5.0 cables. You avoid using messy adapters with high-end graphics cards. If you build with NVIDIA 40-series cards, this version ensures direct connectivity. Other models in this list do not specify this version. Verify your motherboard and GPU requirements before buying.

2. Match the form factor

   Your case dictates the physical size of the power supply. Most GAMEMAX units use the standard ATX form factor. This fits standard mid-tower and full-tower cases. However, the GS Series 650W and the 850W SFX models use the smaller SFX format. You must choose SFX only if your case explicitly supports it. Using the wrong size prevents installation. Measure your case interior before selecting a unit to ensure proper fit.

3. Verify efficiency rating

   Efficiency determines how much electricity converts to useful power. All listed GAMEMAX models hold 80 Plus Gold certification. This rating ensures high performance at typical loads. You save on electricity bills and generate less heat. Gold efficiency is superior to Bronze or White standards. This spec remains consistent across the entire list. You do not need to compare different tiers for efficiency. All options meet this high standard for reliable operation.

4. Assess modularity needs

   Fully modular designs let you connect only the cables you use. Every GAMEMAX PSU in this guide offers fully modular cables. This feature simplifies cable management inside your case. You remove unnecessary wires to improve airflow. It also makes installation easier in tight spaces. Non-modular units have fixed cables that clutter the build. Since all options here are fully modular, you get this benefit regardless of your wattage choice.

5. Confirm wattage requirements

   Select a wattage that matches your system components. The 650W GS Series suits smaller builds with modest power needs. The 850W models provide headroom for high-performance GPUs. You should choose higher wattage if you plan to upgrade later. The 850W SFX model offers high density for compact cases. Ensure your power supply exceeds the total draw of your CPU and GPU. This prevents instability under heavy loads.

Frequently asked questions

See also

• gamemax 1050w atx 3 0 vs sfx power supply 850w
• gamemax sfx power supply 750w vs gs series sfx power
• best PC cases under 100
• best portable power banks under 100