There is no “TCC + WDDM” on a single GPU. But on multi-GPU systems, combining + N TCC GPUs for work is the optimal architecture for Windows-based compute servers.
TCC allows CUDA to be used through Windows Remote Desktop (RDP), which is historically problematic for WDDM-based GPUs. NVIDIA Developer Forums When to Choose WDDM
Source: Internal NVIDIA developer benchmarks (2024)