The CUDA engine is untouched: on the RTX 5080 p.hkl is byte-identical to rc175 on 4nwv, lysozyme
and cytochrome C. Under --no-gpu (lysozyme, cytochrome C, myoglobin) intensities move at the ulp
level from the single-precision fit and nothing changes beyond noise in battery compare; wall
44/117/71 s -> 41/105/65 s.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>