SWTX (Server Workstation Technology eXtended) is a computer chassis and motherboard form factor that seems to be similar to (but larger than) WTX. At the time of writing, the SWTX format and terminology is used only by Supermicro, and they are moving away from it. According to Supermicro tech support, SWTX motherboards are not compatible with ATX/EATX cases because of their size and mounting scheme. Likewise, ATX motherboards are not compatible with SWTX cases.