Apevia
Apevia TFX-AP300W Standard Flex ATX 300W Power Supply
Bottom line: The Apevia TFX-AP300W Standard Flex ATX 300W Power Supply: +12V rail rated at 20A for CPU and drive loads in compact systems; main trade-off: 300W ceiling rules out power-hungry discrete graphics cards.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
Pros & Cons
Pros
- ✓ +12V rail rated at 20A for CPU and drive loads in compact systems
- ✓ 20/24-pin main connector fits both older and newer motherboards
- ✓ Floppy plus 3 Molex leads power vintage IDE, optical and floppy drives
- ✓ 3 SATA connectors for modern SSDs and hard drives
- ✓ 115-230V AC input at 50/60Hz works on most mains supplies
Cons
- ✗ 300W ceiling rules out power-hungry discrete graphics cards
- ✗ No PCIe GPU power connector listed in the spec
- ✗ No 80 Plus efficiency rating stated in the listing
- ✗ Flex ATX size won't mount in a standard ATX bay without an adapter bracket
Manufacturer description
The Apevia TFX-AP300W is a 300W Flex ATX power supply for small form-factor cases, compact office machines and retro PC rebuilds where a full-size ATX unit will not fit. It accepts 115-230V AC input at 50/60Hz, so the same unit works on North American mains and on most international mains. Output covers every rail you need. The +12V rail is rated at 20A, the +3.3V and +5V rails at 12A each, -12V at 0.3A and +5VSB at 2.5A for standby power. Apevia specifies 5% tolerance on the 5V, 3.3V and 12V outputs. A single 80mm fan provides forced-air cooling. The connectors suit low- to mid-power…
SpecPicks Verdict
SpecPicks scored Apevia TFX-AP300W Standard Flex ATX 300W Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies & cables category. Apevia's power supplies & cables 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 & cables 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.
Frequently Asked Questions
Will the Apevia TFX-AP300W fit my case?
It is a standard Flex ATX unit, designed for most small form-factor cases that take Flex ATX power supplies. Before you buy, measure your existing PSU or check your case's specs to confirm it uses the Flex ATX form factor.
Does it work with a 20-pin and a 24-pin motherboard?
Yes. The main power lead is a 20/24-pin connector, so it plugs into older 20-pin boards and newer 24-pin boards. A separate 4-pin 12V P4 connector supplies CPU power.
Can I use it in a retro PC with IDE and floppy drives?
Yes. It includes 3 Molex peripheral connectors for IDE hard drives and optical drives, plus 1 floppy connector. It also has 3 SATA connectors if you are adding modern storage.
How much power does the +12V rail provide?
The +12V rail is rated at 20A. The +3.3V and +5V rails are rated at 12A each, -12V at 0.3A and +5VSB at 2.5A. Apevia lists 5% tolerance on the 5V, 3.3V and 12V outputs.
Can I run a graphics card from this power supply?
The spec lists no PCIe power connector, and total output is 300W. That makes it a fit for integrated graphics or low-power cards that draw all their power from the slot. For anything bigger, check the card's power requirements first.
Key Features
- APEVIA TFX-AP300W Standard 300W Flex ATX Power Supply
- Input Voltage: 115-230V AC, Input Frequency: 60/50
- Output: +3.3@12A; +5A@12A; +12V@20A; -12V@0.3A; +5VSB@2.5A
- 5% Tolerance of 5V, 3.3V & 12V Output
- Forced Air Ventilation by 1 x 80mm Fan
Full Specifications
| Brand | Apevia |
|---|---|
| Output | +3.3@12A; +5A@12A; +12V@20A; -12V@0.3A; +5VSB@2.5A |
| Wattage | 300 watts |
| Fan Size | 80 Millimeters |
| Model Name | TFX-AP300W |
| Form Factor | ATX |
| Model Number | TFX-AP300W |
| Input Voltage | 115-230V AC, Input Frequency: 60/50 |
| Connector Type | atx,floppy,sata |
| Cooling Method | Air |
| Number of Fans | 1 |
| Output Wattage | 300 Watts |
| Item Dimensions | 6.75 x 3.23 x 2.5 inches |
| Mfr Part Number | TFX-AP300W |
| Compatible Devices | Small Form Factor (SFF) desktops, TFX form factor PCs, slim desktop computers, Micro ATX systems with TFX PSU support |
| Power Supply Design | Non-Modular |
| Maximum Input Voltage | 230 Volts |
| Minimum Input Voltage | 115 Volts |
| Item dimensions L x W x H | 6.75 x 3.23 x 2.5 inches |
| System Bus Connector Type | ATX |
| Full listing title | Apevia TFX-AP300W Standard Flex ATX 300W Power Supply - 115-230V AC, 1 x 20/24Pin Main Power, 1 x 12V(P4), 3 x Pheripheral, 3 x SATA, 1 x Floppy |
Ready to buy?
Apevia TFX-AP300W Standard Flex ATX 300W Power Supply - 115-230V AC, 1 x 20/24Pin Main Power, 1 x 12V(P4), 3 x Pheripheral, 3 x SATA, 1 x Floppy 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.
Related Power Supplies & Cables
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- How to Build a Windows 98 Retro PC in 2026
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- Best Retro Handhelds in 2026 — From $35 to $500
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- Best 1440p Gaming GPUs in 2026
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
More reviews from the SpecPicks archive
Browse all reviews →- Best SSD for Steam Deck and Handheld Gaming Storage Expansion 2026
- CRT Monitor for Retro Gaming: What Actually Matters in 2025
- Does Ryzen 3D V-Cache Speed Up CPU-Only LLM Inference?
- Asus ROG Harpe II Extreme: A 24K-Gold, 65K-Sensor Gaming Mouse
- Ryzen 7 9800X3D vs Ryzen 9 9950X3D: Which X3D Wins at 1440p in 2026?
- Claude Code + Fable 5 Ported Command & Conquer to iOS in Hours: What Local Coding Rigs Need
- Best Beginner Racing Wheel 2026: Logitech G29 vs HORI FFB
- Blue Yeti vs HyperX QuadCast 2 S: Best USB Mic for Streaming in 2026
- Voodoo5 5500 PCI Boots on Modern ASUS P8Z77-V Pro — A Look at Retro GPUs in 2026 Boards
- Best 1440p Gaming Monitor in 2026: 5 Picks for Esports, RPGs, and PS5
- Best 16GB GPU for Local LLM 2026
- Qualcomm Enters the Data-Center Market With Its Own AI Processor
- PCI vs ISA Serial Cards on Windows 98 and DOS: Which Chipsets Actually Work
- What Rig Runs an AI Agent Locally? Building for the Agent Era
- pxpipe: Hide Text in PNGs to Cut Claude Code Token Costs up to 70%
- Intel Arc Pro B70 + llm-scaler-vllm 1.4: Is It the New Budget Inference King?
- Qwen 3.6 27B vs Llama 3.1 70B on Local Hardware: tok/s, VRAM, and Quality (2026)
- CompactFlash as a Win98 Hard Drive: IDE Adapter Setup Guide
- HyperX QuadCast 2 vs Blue Yeti: Best USB Mic for Game Streaming in 2026
- Best Gaming Monitors in 2026: 1080p, 1440p, and 4K Picks
- Run Home Assistant on a Raspberry Pi 4 8GB in 2026 (SSD Boot)
- Ryzen 5 5600G vs Ryzen 7 5700X vs Ryzen 7 5800X for 1080p Gaming in 2026
- Build a Raspberry Pi 4 AirPlay Receiver in 2026: Full Walkthrough
- Sony Trinitron FW900 Setup for Retro Gaming: Resolution Sweet Spots, Calibration, and Refresh-Rate Math
Earliest SpecPicks reviews
Browse full archive →- Best GPU for Llama 3.1 8B (2026)
- Best GPU for Qwen 3 14B (2026)
- Best GPU for Qwen 3 32B (2026)
- Best GPU for Llama 3.1 70B (2026)
- Best GPU for DeepSeek-R1 32B (2026)
- Best GPU for Llama 3.1 405B (2026)
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 5090
- How to run DeepSeek-R1 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 4090