GAMEMAX
GAMEMAX Rampage Series
Bottom line: The GAMEMAX Rampage Series: ATX 3.1 / PCIe 5.1 ready with a 12VHPWR 16-pin that delivers up to 600W to the GPU; main trade-off: zero-RPM mode ends at 20% load (about 250W), so the fan runs during gaming.
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Pros & Cons
Pros
- ✓ ATX 3.1 / PCIe 5.1 ready with a 12VHPWR 16-pin that delivers up to 600W to the GPU
- ✓ 80 Plus Platinum rated: 92%+ efficiency at typical loads means less wasted heat
- ✓ 135mm fluid dynamic bearing fan with zero-RPM mode below 20% load for silent idle
- ✓ 105°C Japanese capacitors plus OTP/OPP/OVP/UVP/SCP/OCP protection circuits
- ✓ 10-year warranty and fully modular cables for a clean all-white build
Cons
- ✗ Zero-RPM mode ends at 20% load (about 250W), so the fan runs during gaming
- ✗ 1250W is more than a single mid-range GPU build needs
- ✗ Listing mixes ATX 3.0 and 3.1 labels; confirm the revision on the unit you receive
- ✗ Cable lengths and connector counts are not listed; check them before a large-case build
Manufacturer description
GAMEMAX Rampage Series, 1250W, Full Modular Power Supply, ATX 3.0 & PCIE 5.0 Ready, 80 Plus Platinum Certified, 105°C Japanese Caps, 135mm F.D.B Fan, 10 Year Warranty, GX1250, White
SpecPicks Verdict
SpecPicks scored GAMEMAX Rampage Series using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. GAMEMAX's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- ATX 3.1 & PCIE 5.1 Ready: Comes with a 12VHPWR 16pin connector to provide to 600W for power hungry Graphics card.
- 80 PLUS Platinum Certified: 92% efficiency or higher under typical loads, reducing energy consumption and augmenting efficiency.
- LLC Topology with DC-DC Module Design: LLC Topology+5V/3.3V DC-DC+12V synchronous rectification power conversion circuitry design provides stable and efficient power output.
- 135MM F.D.B Fan: The fluid dynamic bearing fan ensures superior cooling and quiet operation, with a ZERO RPM mode under 20% load for ultra silent functionality.
- 105°C Japanese Caps: Ensure reliable and durable power and enjoy peace of mind with a long-term warranty. OTP/OPP/OVP/UVP/SCP/OCP electrical Multi-Protection included.
Full Specifications
| Brand | GAMEMAX |
|---|---|
| Wattage | 1250 watts |
| Model Name | rampage series |
| Unit Count | 1 Count |
| Form Factor | ATX |
| Connector Type | atx,pcie |
| Cooling Method | Air |
| Number of Fans | 1 |
| Output Wattage | 1250 watts |
| 135MM F.D.B Fan | The fluid dynamic bearing fan ensures superior cooling and quiet operation, with a ZERO RPM mode under 20% load for ultra silent functionality. |
| Compatible Devices | ATX compatible devices |
| Power Supply Design | Full Modular |
| 105°C Japanese Caps | Ensure reliable and durable power and enjoy peace of mind with a long-term warranty. OTP/OPP/OVP/UVP/SCP/OCP electrical Multi-Protection included. |
| Warranty Description | 10 year manufacturer |
| Maximum Input Voltage | 240 volts_of_alternating_current |
| Minimum Input Voltage | 110 volts_of_alternating_current |
| ATX 3.1 & PCIE 5.1 Ready | Comes with a 12VHPWR 16pin connector to provide to 600W for power hungry Graphics card. |
| System Bus Connector Type | 20+4 Pin |
| 80 PLUS Platinum Certified | 92% efficiency or higher under typical loads, reducing energy consumption and augmenting efficiency. |
| Connector Type Used on Cable | atx,pcie |
| Full listing title | GAMEMAX Rampage Series, 1250W, Full Modular Power Supply, ATX 3.1 & PCIE 5.1 Ready, 80 Plus Platinum Certified, 105°C Japanese Caps, 135mm F.D.B Fan, 10 Year Warranty, GX1250, White |
Ready to buy?
GAMEMAX Rampage Series, 1250W, Full Modular Power Supply, ATX 3.1 & PCIE 5.1 Ready, 80 Plus Platinum Certified, 105°C Japanese Caps, 135mm F.D.B Fan, 10 Year Warranty, GX1250, White is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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