Can a Single Piece of Mining Hardware Efficiently Mine Two Different Algorithms?
Generally, a single piece of mining hardware cannot efficiently mine two fundamentally different algorithms. For example, an ASIC designed for SHA-256 (Bitcoin) is completely inefficient for an algorithm like Ethash (GPU-optimized).
While a general-purpose GPU can mine various algorithms, it will not be optimally efficient for all. The need for different hardware types is precisely what makes multi-algorithm mining a security feature, as it prevents a single, powerful machine from dominating the network.