Originally, BIOS firmware was stored in a ROM chip on the PC motherboard. Beginning with the nForce 4, Nvidia started including onboard graphics solutions in their motherboard chipsets. There is also an ISO image installer that supports legacy BIOS motherboard. FreeBSD, Microsoft Windows, or the motherboard BIOS. Provides a WTX style motherboard connector which is incompatible with the standard ATX motherboard connector. Anti-virus software is not effective at protecting firmware and the motherboard BIOS from infection. The most recent ATX motherboard specification is version 2.2. ATX is the most common motherboard design. This effectively doubled the computing performance available to each motherboard processor socket. An advantage of having an EATX motherboard is dual socket support. This causes the solder between this chip and the motherboard to break. ATX power supplies are turned on and off by a signal from the motherboard. Panels were made that allowed fitting an AT motherboard in an ATX case. This caused the integrated circuit chips to disconnect from the motherboard. The most basic interfaces use audio circuitry that is built into the computer motherboard.