Balanced Technology eXtended (BTX) Form Factor - The Future of Cases & Motherboardsby Anand Lal Shimpi on September 18, 2003 12:34 PM EST
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BTX Cases and Power Supplies
As we mentioned at the start of this article, the BTX standard specifies the same motherboard connectors as we saw with ATX - meaning that ATX power supplies could be used in BTX cases and with BTX motherboards. The vast majority of ATX power supplies will not fit in micro and definitely not in picoBTX cases, but using them in a full sized BTX tower is a possibility.
Standards for BTX form factor power supplies are being worked on now and one thing you'll definitely see is the new 3.3V Serial ATA power connector on these units. Below you'll see some examples of microBTX power supplies:
You can see that the form factor of the power supplies works very well given the size constraints on microBTX cases:
Here's a bit of a closer look at the inside of a microBTX case: