About two and a half years ago Intel officially announced BTX and according to the company the adoption rate of this form factor will already be at 24% during the first half of this year.
Intel's forecast for BTX on Intel-based PCs is set at 36% by the end of next year. Intel already projects the adoption rate of BTX for the first half of 2006 to be at 24%. The answer for this is very simple, simple builders are using BTX and en masse. The channel availability of retail BTX motherboards does not even register on Intel's 1H'06 forecast, but the document does claim BTX will account for 5% of new system DIY builds by the end of this year using retail and channel components.
The same BTX adoption forecast puts system builder adoption of BTX as high as 21% for Intel-based PCs. 92% of Dell desktops, 98% Gateway Intel desktops, and 65% of Lenovo desktops are using BTX form factors. The document goes on to detail that HP is also adopting BTX for its Intel PC lineup; the company's business BTX line will launch later this year while the consumer Intel PC line has differed the BTX conversion decision until 2007. Regardless, three of the top four US system builders are using BTX at least in majority.