This article covers Phanteks Eclipse P300 Tempered Glass WHITE PCケース PH-EC300PTG_WT.

Overview

The Phanteks Eclipse P300 is a mid-tower PC case that emphasizes value without sacrificing aesthetics. This white variant with a tempered glass side panel (model PH-EC300PTG_WT) offers a clean, minimalist look while letting you show off your components. It supports ATX, M-ATX, ITX, and even E-ATX motherboards up to 275mm wide, with CPU cooler clearance of 160mm and GPU length up to 330mm — enough room for most mainstream builds. The case features a bottom-mounted PSU design, simple front I/O with two USB 3.0 ports, and mounting points for up to four fans (one top, two bottom, one rear). While the front panel is solid rather than mesh, the overall airflow is adequate for mid-range configurations. The tempered glass side panel is secured with thumbscrews and provides a clear view of the interior. Positioned firmly in the entry-to-mid-range segment, the Eclipse P300 has been a popular choice since its 2018 launch and remains widely available at an attractive price point.

Compatibility Guide

Motherboard: ATX, M-ATX, ITX, and E-ATX up to 275mm width. Note that E-ATX boards may block some cable routing holes. CPU Cooler: Maximum height 160mm. Most tower air coolers and AIO pump blocks will fit, but check clearance with top fan. GPU: Maximum length 330mm. Fits most modern graphics cards except the very largest (e.g., some RTX 4090 custom models). PSU: Bottom mount, standard ATX. Non-modular PSUs can be tricky due to limited cable management space; semi or fully modular units are recommended. * Storage: Two 2.5-inch SSD mounts and two 3.5-inch HDD bays. The drive cage is removable for extra airflow or radiator space.

Product Info

Released in 2018, the Phanteks Eclipse P300 is a long-running model that still sells well thanks to its low price and solid build. The tempered glass version typically retails between $50 and $70 USD. Warranty is usually 2 years from Phanteks. Market positioning: entry to mid-range. Its key differentiators are the tempered glass side panel and clean design at a budget price. However, the lack of a mesh front panel means airflow is not class-leading.

Best Use Cases

First-time PC builders: Affordable, easy to work in, and comes with clear instructions. A great starting point for learning cable management and component installation. Budget gaming rigs: Pair with a mid-range CPU like Ryzen 5 or Core i5 and a GPU up to RTX 4070 class. The case provides sufficient cooling and expansion for 1080p/1440p gaming. * White-themed builds: The white paint job and tempered glass create a clean, modern look that matches white components and RGB lighting.

Things to Consider

Airflow is limited by the solid front panel. For high-TDP components (e.g., Core i9 or RTX 4080+), consider adding bottom intake fans or replacing the front panel with a mesh alternative if available. Cable management space behind the motherboard tray is tight. Use a modular PSU and thin cables to keep the side panel closing easily. E-ATX support is width-limited to 275mm; some wider E-ATX boards won't fit. Always check motherboard dimensions before purchasing. Top radiator support is limited to 240mm, and clearance with tall RAM or VRM heatsinks can be an issue. Measure carefully if planning liquid cooling. ## Alternatives
Competitors in the same price bracket include the Cooler Master MasterBox Q300L and Fractal Design Focus G. The Q300L is more compact with magnetic dust filters but offers less GPU clearance. The Focus G has a mesh front for better airflow but a more traditional design. The Eclipse P300 wins on aesthetics with its tempered glass panel and minimalist look, making it ideal for users who prioritize appearance over maximum airflow.

Product Disclosure (Amazon)

  • Manufacturer: Phanteks
  • Seller: クリエイトハマダ
  • Fulfilled by: クリエイトハマダ
  • ASIN: B079QH3HJN
  • Note: This article covers a manufacturer-made product based on Amazon listing details.