Final answer:
The main differences between flexATX/ITX and standard ATX power supplies are size, with flexATX/ITX being smaller, power output, compatibility with different cases, and cooling solutions. FlexATX/ITX power supplies are suited for small form factor builds, while standard ATX power supplies are designed for full-size desktops.
Step-by-step explanation:
Differences Between FlexATX or ITX and Standard ATX Power Supplies
The primary distinction between a flexATX/ITX form factor and a standard ATX form factor power supply is size. The flexATX and ITX power supplies are designed for small form factor (SFF) cases and therefore are significantly smaller in size compared to the standard ATX power supplies, which are designed for full-size desktop cases. Because of their size, the power output of flexATX and ITX power supplies is generally lower, making them suitable for systems with lower power consumption. Additionally, these power supplies may have different mounting hole patterns and can include fewer connectors due to the compact size constraints.
Compatibility is another key consideration; the flexATX/ITX power supplies may not fit in cases designed for ATX power supplies without an adapter. Conversely, a standard ATX power supply is usually too large to fit in a case designed for flexATX or ITX form factors. The physical dimensions of the power supply have implications for the type of computer build for which it is suitable, with smaller units being favored in mini PCs and home theater PCs (HTPCs).
Lastly, the cooling solutions in flexATX/ITX units tend to be different due to the smaller size of the power supply. They typically have smaller fans or might even rely on passive cooling strategies more often than standard ATX power supplies.