Better: Tcc Wddm

Only Quadro, Tesla, and data center GPUs support TCC in official drivers. Community patches exist for GeForce (e.g., “TCC enabler” scripts), but they may break driver signing. For professional work, buy a used Quadro RTX or Tesla card.

| Test | WDDM Mode (Standard) | TCC Mode | Improvement | | :--- | :--- | :--- | :--- | | | 3,450 | 4,120 | +19.4% | | CUDA Memcpy (Host to Device) | 12.4 GB/s | 25.1 GB/s | +102% (Bypasses PCIe limits imposed by WDDM) | | Kernel Launch Overhead (100k launches) | 2.4 seconds | 0.9 seconds | -62% | | Multi-GPU Scaling (2x GPUs) | 1.6x speedup | 1.95x speedup | Near-native NVLink speed | tcc wddm better

The TCC driver operates differently. Rather than acting as a manager for a local physical GPU output, it acts as a "virtual" display endpoint optimized for streaming. Only Quadro, Tesla, and data center GPUs support

Independent benchmarks (e.g., Phoronix, NVIDIA developer forums) show: | Test | WDDM Mode (Standard) | TCC

WDDM reserves a portion of VRAM for the Windows desktop and UI. TCC treats the GPU as a pure compute device, freeing up all available memory for your workload. Comparisons at a Glance Which NVIDIA Windows Driver do I need? WDDM vs. TCC