Attempting to combine power supplies in this manner can be potentially dangerous and may result in damage to the power supplies or connected devices. It is generally not recommended to connect multiple power supplies together in this manner, especially if they are not specifically designed for parallel operation. ATX power supplies are not typically designed to be connected in parallel. Each power supply has its own internal circuitry and protections, and connecting them together can cause unintended consequences, such as voltage imbalances, current sharing issues, or even damage to the power supplies themselves. If you require a higher voltage output or more power, it is advisable to use a power supply specifically designed for that purpose, or consider using a single power supply with the desired voltage and power rating. If you have specific power requirements, it would be best to consult with an electrical engineer or an expert in power supply systems who can provide guidance tailored to your needs and ensure proper and safe operation.