Compatibility With ATX Products
In the first months of production the ATX and BTX motherboards were so similar that moving a BTX motherboard to an ATX case was possible and vice-versa, this was possible because the first BTX motherboards were ATX motherboard turned upside down, except for the component location that really were BTX positioning. This changed when the BTX form factor had a big change by turning it into a mirror image of the ATX standard, since the new motherboard design both standards are incompatible. Basically BTX motherboards are 'leftside-right' (not upside-down!) compared to ATX, i.e. they are mounted 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 connector and slot standards are identical, including PCI(e) cards, processors, RAM, hard drives, etc. BTX power supply units can be exchanged with newer ATX12V units, but not with older ATX power supplies lacking the extra 4-pin 12V-connector, which was introduced with BTX and later carried over to the ATX12V standard.
Read more about this topic: BTX (form Factor)
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