diff --git a/BENCHMARKS.md b/BENCHMARKS.md
index e688b12..21c8c02 100644
--- a/BENCHMARKS.md
+++ b/BENCHMARKS.md
@@ -362,3 +362,14 @@ q4/q6 quality ladder, m3ultra cross-bench.
 Remaining ladder (untested): q6/q4 quality/speed, 1024-res, fewer-steps floor (10?),
 m3ultra cross-bench (~1.4× compute but needs 34GB disk — m3 disk currently tight),
 MODELBEAST operator wrapper (qwen_layered_local) once defaults settle.
+
+### Cross-bench addendum: m3ultra joins (same baked q8, 20 steps, 640, 4 layers)
+
+| box | wall | note |
+|---|---|---|
+| m3ultra | **243.0 s** | 1.50× vs m1 — matches fleet-matrix TFLOPS ratio (1.44×) |
+| m1ultra | 365.6 s | |
+
+Both Ultras now serve Qwen-Image-Layered from the same 34GB baked-q8
+artifact (m3: ~/qwen-layered/, m1: ~/qwen-layered-staging/) + the same
+Gitea fork clone. Peak 36.7GB either box. m3 disk after install: ~82GB free.