My REQ_DEPTH=1024 reduction was wrong: I sized it off a 478 peak from a SMALL
scene. The documented full-f52 replay peak is 6,115 (adjacent frame 3,610; even
2,048 clips) — ch439_timing_convergence_prefit.md. The raster cannot backpressure,
so an undersized FIFO SILENTLY DROPS Z-requests -> corrupt frame. The -0.074 fit
was on an invalid (drop-prone) config. Restore 8,192 as the correctness baseline.
The real timing fix is a registered/skid AR-handshake boundary (arbiter s2_arready
combinational -> texcache F_AR), NOT FIFO shrinking. Packaging that for Codex review.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
thejayman77
67aa332928