Building llama.cpp from source on a Dell Precision T5820 with an RTX 3090 Ti (after seven power cycles)

This post details setting up a Dell Precision T5820 with an RTX 3090 Ti for AI inference using llama.cpp to run Qwen3.6-27B. The author shares the build recipe, PCIe troubleshooting, and long-context tricks, highlighting patience as a crucial fix.