diff --git a/scripts/frank-primary.env b/scripts/frank-primary.env
index e8bdec2..a3531e3 100644
--- a/scripts/frank-primary.env
+++ b/scripts/frank-primary.env
@@ -62,9 +62,15 @@ NGL=999
 OT_OVERRIDES=exps=CPU,per_layer_token_embd.weight=CPU
 TENSOR_SPLIT=1,1
 
-# The drafter lives on the first R9700 (the card the load log shows holding
-# the shared embedding borrow path).
-SPEC_DRAFT_DEVICE=ROCm0
+# The drafter MUST sit on the SECOND R9700 (ROCm1): with -ts 1,1 the main
+# model's output head lands on the last-layers card, and the shared MTP head
+# BORROWS it. --override-tensor sets has_tensor_overrides(), which pins
+# n_copies==1 in the draft's scheduler — a borrowed output.weight sitting in
+# a ROCm1 buffer then aborts the draft graph with ggml-backend.cpp:941
+# "pre-allocated tensor (output.weight) in a buffer (ROCm1) that cannot run
+# the operation" when the draft is elsewhere (verified live 2026-09-26: the
+# ROCm0 placement crash-looped 4x at ~12 s, ROCm1 loaded and served).
+SPEC_DRAFT_DEVICE=ROCm1
 
 # Batch geometry: logical batch 8192 with ubatch 512 — the measured optimum
 # class on this fleet's ROCm stack (a bigger logical batch is free; compute