BTX (form Factor) - Why Wasn't BTX Accepted?

Why Wasn't BTX Accepted?

The BTX form factor has not been widely adopted despite its improvements over ATX and related standards. As a result, the availability and variety of BTX-compatible components is limited. One reason for the failure of BTX to gain traction in key markets was the rise of energy-efficient components(CPU's, chipsets and GPUs) which require less power and produce less waste heat, eliminating two of the primary intended benefits of BTX. Another reason was the lack of OEM adopters. Initially, only Gateway and Dell offered computers with the new format, later HP and Fujitsu-SIEMENS (now Fujitsu) also offered some BTX-based computers. However, most other manufacturers stayed with the ATX standard, and even the handful of manufacturers who did adopt BTX for some products continued to produce the bulk of their machines with the ATX form factor. Many features of BTX were however adopted into the design of ATX and other form factor machines, such as the additional 4-pin 12V connector of BTX power supplies, the direct air intake of CPU coolers from outside, the combination of the CPU and case fans into a single fan, etc.