In some embodiments, a chip includes transmitters to provide transmit signals to chip interfaces and voltage control circuitry to control voltages of the transmit signals. The chip further includes receivers to receive external signals from another chip. The chip also includes evaluation circuitry to determine whether the transmit signals were usable by the other chip based on an evaluation of at least one of the received external signals and to provide a usability indicating signal to the voltage control circuitry indicative of whether the transmit signals were usable by the other chip. Other embodiments are described and claimed.