GameMax GT300 300W TFX PSU - 80 Plus Bronze, Active PFC
GameMax
GameMax GT300 300W TFX PSU - 80 Plus Bronze, Active PFC
The GameMax GT300 300W TFX PSU is a compact TFX-form-factor power supply suited to small-form-factor and compact desktop system builders who need a reliable, certified unit without overspending. It carries an 80 Plus Bronze certification and Active PFC, delivering up to 85% efficiency in a chassis-friendly package with L-shaped SATA connectors designed to ease cable routing in tight spaces.
Why this product
80 Plus Bronze certified efficiency
Certified at 80 Plus Bronze, it reaches up to 85% efficiency, reducing wasted energy and heat output compared to non-certified units.
TFX form factor for compact builds
The TFX form factor and 85 × 65 × 175 mm dimensions make it a direct fit for compact desktop and small-form-factor chassis that cannot accept a standard ATX unit.
L-shaped SATA connectors ease cable routing
Three L-shaped SATA connectors are specifically designed to simplify installation and cable management inside space-constrained cases.
Active PFC up to 0.99
Active Power Factor Correction rated above 0.99 reduces reactive power draw and is compatible with the full 100–240 V AC input range.
Full electrical protection suite
Over-voltage, under-voltage, over-power and short-circuit protection (OVP / UVP / OPP / SCP) are all included, guarding connected components against common fault conditions.
Quiet 8 cm fan with intelligent control
The 8 cm fan operates at under 17 dBA and adjusts speed automatically to balance cooling and noise based on load.
- Rated Power300 W
- Form FactorTFX
- Efficiency Rating80 Plus Bronze (up to 85%)
- Dimensions85 × 65 × 175 mm (W × H × D)
- Noise Level< 17 dBA
- PFCActive (> 0.99)
- MTBF100,000 hours
- Warranty2 Years (units bought after 1 Jan 2023)
- SKUGAM-758
- EAN6931858790246
- Fits chassis with a TFX power supply bay (85 × 65 × 175 mm footprint).
- Compatible with ATX 12V 2.3 motherboards via the included 20+4 pin main connector.
- Supports CPUs requiring a 4+4 pin 12 V connector, including many mid- and high-end desktop processors.
- Universal AC input (100–240 V, 50–60 Hz) — compatible with mains voltage in the UK, EU, US and most other regions without a manual switch.
- No PCIe / GPU power connector is included. Discrete graphics cards requiring 6-pin or 8-pin PCIe power cannot be connected without an adapter, and the 300 W total output limits GPU headroom significantly.
- Does not fit standard ATX, SFX, SFX-L or Flex-ATX chassis — TFX bay required.
Best for
- Compact desktop and HTPC builders who need a TFX unit to fit a small chassis and have no room for a standard ATX supply.
- Budget-conscious system builders who want an 80 Plus Bronze certified supply without paying for higher-tier efficiency ratings.
- Low-power office or media PC builds where total system draw sits comfortably within 300 W and integrated or low-power discrete graphics are used.
- Noise-sensitive environments — the sub-17 dBA fan rating and intelligent speed control keep acoustic output low under light to moderate loads.
Trade-offs
- High-end gaming rigs with a power-hungry discrete GPU — 300 W total output and no native PCIe power connector mean it is not suited to systems drawing significantly above that threshold.
- Builds needing more than three SATA devices — only three SATA connectors and one 4-pin Molex are provided, limiting storage and peripheral connectivity.
- Standard ATX or SFX chassis — the TFX form factor will not physically fit ATX, SFX or Flex-ATX bays.
- Users who need more than a 2-year warranty — the warranty period is 2 years for units purchased after 1 January 2023, shorter than some competing units at similar price points.
The GameMax GT-300W TFX offers you the most suitable cost/performance ratio and is certified for 80 PLUS Bronze, this active PFC unit runs at a max. of 85% efficiency, making it the best choice for a system builder. The 12V CPU power is available for a high-end gaming system (with a 4 + 4 CPU connector), with its 3 x L shaped SATA connectors meaning you can use it in a compact desktop chassis. Finally there is full electrical protection and official safety is promised by GameMax.
General
| Brand | GameMax |
|---|---|
| Model | GT300 |
| Form Factor | TFX |
| ATX Standard | ATX 12V 2.3 |
| Dimensions | 85 × 65 × 175 mm (W × H × D) |
| Weight | Approximately 1.06 kg |
| Casing | SECC 0.6 mm steel |
Power & Efficiency
| Total Output Power | 300 W |
|---|---|
| Efficiency | > 81% (85% max) — 80 Plus Bronze Certified |
| PFC | Active (> 0.99) |
| AC Input | 100–240 VAC, 6–3 A, 50–60 Hz |
| +3.3V Rail | 15 A |
| +5V Rail | 15 A |
| +12V Rail | 20 A |
| -12V Rail | 0.5 A |
| +5VSB Rail | 2.5 A |
Connectors
| 20+4 Pin Main | 1 |
|---|---|
| 4+4 Pin 12V CPU | 1 |
| SATA Connectors | 3 (L-shaped) |
| 4-Pin Molex | 1 |
Reliability & Safety
| Protection | OVP / UVP / OPP / SCP |
|---|---|
| Safety Certifications | CE / FCC / CB |
| Cooling | 8 cm fan with intelligent speed control |
| Noise Level | < 17 dBA |
| Operation Temperature | 0–40 °C |
| MTBF | 100,000 hours |
| Hold Up Time | 1 ms – 40 ms |
| Power Good Signal | 100–500 ms |
| Warranty | 2 Years (units bought after 1 Jan 2023) |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.