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|Name||PCB size (mm)|
|WTX||356 × 425|
|AT||350 × 305|
|Baby-AT||330 × 216|
|BTX||325 × 266|
|ATX||305 × 244|
|EATX (Extended)||305 × 330|
|LPX||330 × 229|
|microBTX||264 × 267|
|NLX||254 × 228|
|Ultra ATX||244 × 367|
|microATX||244 × 244|
|DTX||244 × 203|
|FlexATX||229 × 191|
|Mini-DTX||203 × 170|
|EBX||203 × 146|
|microATX (min.)||171 × 171|
|Mini-ITX||170 × 170|
|EPIC (Express)||165 × 115|
|Mini ATX||150 × 150|
|ESM||149 × 71|
|Nano-ITX||120 × 120|
|COM Express||125 × 95|
|ESMexpress||125 × 95|
|ETX/XTX||114 × 95|
|Pico-ITX||100 × 72|
|PC/104 (-Plus)||96 × 90|
|ESMini||95 × 55|
|Qseven||70 × 70|
|mobile-ITX||60 × 60|
|CoreExpress||58 × 65|
BTX (for Balanced Technology eXtended) is a form factor for motherboards, originally intended to be the replacement for the aging ATX motherboard form factor in late 2004 and early 2005. It was designed to alleviate some of the issues that arose from using newer technologies (which often demand more power and create more heat) on motherboards compliant with the circa-1996 ATX specification. The ATX and BTX standards were both proposed by Intel. Intel's decision to refocus on low-power CPUs, after suffering scaling and thermal issues with the Pentium 4, has added some doubt to the future of the form factor. The first company to implement BTX was Gateway Inc, followed by Dell and MPC. Apple's Mac Pro utilizes some elements of the BTX design system as well but is not BTX compliant, rather using a proprietary form factor. However, future development of BTX retail products by Intel was canceled in September 2006. Many companies now use proprietary form factors.
Pico BTX is a motherboard form factor that is meant to miniaturize the BTX standard. Pico BTX motherboards are relatively small, 10.5"x8" (smaller than many current 'micro'-sized motherboards), hence the name 'pico'. These motherboards share a common top half with the other sizes in the BTX line, but support only one or two expansion slots, designed for half-height or riser-card applications.
The BTX form factor motherboards are incompatible with most of the ATX form factor cases and vice-versa. In particular, BTX motherboards are 'flipped' compared to ATX and mount on the opposite side of the case. Some cases such as the Cooler Master Series (Stackers) support a varying range of motherboard types such as ATX, BTX, Mini-ATX and so forth. However, all connectors are compatible, including power supplies, PCI cards, processors, RAM, hard drives, etc.
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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 which require less power and produce less waste heat, eliminating two of the primary intended benefits of BTX.
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