Atx Specification Pdf [Firefox TRUSTED]
Formfactors.org (now defunct) used to host this. Today, it is preserved on:
| Feature | ATX 2.2 (Old) | ATX 3.0 (New) | | :--- | :--- | :--- | | | Not present | Mandatory for high-power GPUs (up to 600W) | | Power Excursion | 10% overload for 10ms | 200% power spike for 100µs (to handle RTX 4090 transients) | | Low Power Efficiency | 70% at 2W load | 60% at 250mW load (improved sleep states) | | +12V Only Rail | Optional | Preferred (some PSUs remove 3.3V/5V regulation) | atx specification pdf
Whether you are a hardware engineer designing a motherboard, a case manufacturer planning airflow, or a PC builder troubleshooting erratic power behavior, the official ATX specification is your definitive rulebook. But finding the correct version, understanding its contents, and applying its rules can be daunting. Formfactors
Many websites offer "free PDFs" that are either outdated, watermarked, or infected with malware. Always use official sources. Many websites offer "free PDFs" that are either
The ATX (Advanced Technology eXtended) specification is a widely adopted standard for motherboard design and power supply in desktop computers. First introduced in 1995 by Intel, the ATX specification has undergone several revisions, with the latest version being ATX 3.0, released in 2022. In this article, we will explore the ATX specification PDF, its history, key features, and the importance of this standard in ensuring compatibility and interoperability between motherboards and power supplies.
Originally introduced by Intel in 1995, the ATX standard replaced the aging AT form factor to improve airflow, simplify component installation, and standardize power delivery. As of 2026, the specification has evolved into , which introduces advanced power standards for high-performance hardware. Core Dimensions and Mechanical Layout