Does the 5.4GHz ceiling on a locked Core i7 14700F hold back the AI jobs that run ahead of the GPU?

  Not by anything you would notice in practice. Prefill and embedding are parallel chores that spread cleanly across 20 cores/28 threads, so the gap to a higher-boost sibling lands in milliseconds; the differences you feel run in seconds and come from memory bandwidth and VRAM, which makes the clock tier the least rewarding thing to fund.

  For a no-overclock, no-fuss mid-range AI host it is a pragmatic base. Before adding budget, confirm the GPU is settled — the same money buys far more on one card step than on one CPU step. There is no iGPU, so the discrete card is load-bearing from day one; sequence the build accordingly.