Ptcliss
300 watts 1U Flex ATX Power Supply with Fixed Cables with 6Pin PCIe Connector，flex-300w
Bottom line: The Ptcliss 300 watts 1U Flex ATX Power Supply is a specs-and-price decision rather than a crowd-consensus one in the power supplies & cables category, priced around $59.99 on Amazon as of 2026-10-06. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Support PCIe 6pin connector
- ✓ Backed by Ptcliss's warranty and support channels
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated
Manufacturer description
300 watts 1U Flex ATX power supply with Fixed Cables with 6Pin PCIe Connector，flex-300w1U Small form Factor Full Range Active PFC PSU widely used in places with unstable voltage, and has the function of automatically protecting computers.Support Standard flex ATX Form Factor，Built with Japanese Capacitors for great reliability and durability Strong heat dissipation, high efficiency and energy saving。Support PCIe 6pin connectorMultiple protection：OVP UVP OCP OPP SCP OTP.1, the picture is taken in kind,2, please carefully confirm the power supply and part number and model before purchase.3…
SpecPicks Verdict
SpecPicks scored Ptcliss 300 watts 1U Flex ATX Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies & cables category. Ptcliss'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.
Key Features
- 300W 1U Small form Factor Full Range Active PFC PSU widely used in places with unstable voltage, and has the function of automatically protecting computers.
- Support Standard flex ATX Form Factor，Built with Japanese Capacitors for great reliability and durability Strong heat dissipation, high efficiency and energy saving。
- Support PCIe 6pin connector
- Multiple protection：OVP UVP OCP OPP SCP OTP.
Full Specifications
| Brand | Ptcliss |
|---|---|
| Wattage | 300 watts |
| Model Name | ptcliss |
| Form Factor | ATX |
| Model Number | flex-300w |
| Connector Type | atx,pcie |
| Cooling Method | Air |
| Number of Fans | 1 |
| Output Wattage | 300 Watts |
| Item Dimensions | 5.9 x 3.2 x 1.58 inches |
| Compatible Devices | Desktop Computer |
| Item dimensions L x W x H | 5.9 x 3.2 x 1.58 inches |
| System Bus Connector Type | 6 Pin |
| Connector Type Used on Cable | atx,pcie |
Ready to buy?
300 watts 1U Flex ATX Power Supply with Fixed Cables with 6Pin PCIe Connector，flex-300w 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.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Related Power Supplies & Cables
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Best Retro Handhelds in 2026 — From $35 to $500
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- Best 1440p Gaming GPUs in 2026
- How to Build a Windows 98 Retro PC in 2026
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
More reviews from the SpecPicks archive
Browse all reviews →- Why FurMark Has a 'GPU Killer' Reputation
- Build a Jellyfin Media Server on a Raspberry Pi 4 8GB: Measured Perf
- Raspberry Pi 5 8GB Review: Specs, Price & Use Cases (2025)
- Xbox Mode's PC Performance Boost Favors Nvidia GPUs
- Best Budget SSD for Gaming and Boot Drives in 2026
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 4090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 3090
- Sound Blaster Audigy FX vs Sound BlasterX G6 for Retro Win98/XP Builds
- Ryzen 7 5800X vs Ryzen 7 5700X for Gaming and Local AI: Which Wins?
- Period-Correct Win98 Build in 2026: CompactFlash, Drivers, Glide
- Best GPU for Running Llama 8B Under $300 in 2026
- GeForce 3 Ti 500 Build Guide: Period-Correct Win98 SE Rig for 2001-Era Gaming
- LM Studio on an RTX 3060 12GB: A Zero-Terminal Local LLM Setup
- NVMe vs SATA for a Steam Library: 970 EVO Plus vs BX500
- Best Single-Board Computer Project Kits for Beginners (2026)
- OpenAI Codex 'Watch Once, Repeat Forever': What It Means for Local Coding Rigs
- Gemini Intelligence Hardware Requirements: What Google's Stack Tells Us About Local Inference
- Intel Arc AI Inference: 2025 Performance & Setup Guide
- Mount a 90s Big-Box CD-ROM ISO on Win98 Without a CD Drive: The CompactFlash + IDE Workflow
- Best 1TB SATA SSD for Cloning Old Drives and OS Migrations 2026
- Intel Core Ultra X7 Panther Lake Performance on Linux 7.1
- Why LLM Reasoning Still Happens in Words, Not Vectors
- Boot Windows 98 from CompactFlash: A Silent, Reliable CF-to-IDE Build
- How to Identify Your Motherboard: A Step-by-Step Guide
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