diff --git a/.github/configs/amd-master.yaml b/.github/configs/amd-master.yaml
index 1c431427e..c275f42f3 100644
--- a/.github/configs/amd-master.yaml
+++ b/.github/configs/amd-master.yaml
@@ -688,7 +688,7 @@ gptoss-fp4-mi355x-vllm:
     - { tp: 8, conc-start: 4, conc-end: 8 }
 
 gptoss-fp4-mi355x-atom:
-  image: rocm/atom:rocm7.1.1-ubuntu24.04-pytorch2.9-atom0.1.1-MI350x
+  image: rocm/atom:rocm7.2.2_ubuntu24.04_py3.12_pytorch_release_2.10.0_atom0.1.2.post
   model: openai/gpt-oss-120b
   model-prefix: gptoss
   runner: mi355x
@@ -699,12 +699,12 @@ gptoss-fp4-mi355x-atom:
   - isl: 1024
     osl: 1024
     search-space:
-    - { tp: 1, conc-start: 16, conc-end: 128 }
+    - { tp: 1, conc-start: 16, conc-end: 256 }
     - { tp: 8, ep: 1, conc-start: 4, conc-end: 32 }
   - isl: 8192
     osl: 1024
     search-space:
-    - { tp: 1, conc-start: 4, conc-end: 128 }
+    - { tp: 1, conc-start: 4, conc-end: 256 }
     - { tp: 8, ep: 1, conc-start: 4, conc-end: 16 }
 
 dsr1-fp8-mi355x-atom:
diff --git a/benchmarks/single_node/gptoss_fp4_mi355x_atom.sh b/benchmarks/single_node/gptoss_fp4_mi355x_atom.sh
index 76bc87c0c..ee0810e8f 100644
--- a/benchmarks/single_node/gptoss_fp4_mi355x_atom.sh
+++ b/benchmarks/single_node/gptoss_fp4_mi355x_atom.sh
@@ -44,6 +44,7 @@ fi
 
 # Start GPU monitoring (power, temperature, clocks every second)
 start_gpu_monitor
+MEM_FRAC_STATIC=0.9
 
 set -x
 
@@ -54,6 +55,7 @@ python3 -m atom.entrypoints.openai_server \
     --server-port $PORT \
     -tp $TP \
     --kv_cache_dtype fp8 $CALCULATED_MAX_MODEL_LEN $EP \
+    --gpu-memory-utilization $MEM_FRAC_STATIC \
     --block-size $BLOCK_SIZE > $SERVER_LOG 2>&1 &
 
 SERVER_PID=$!
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index 2bd2f025c..8cff8bda2 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -1892,3 +1892,9 @@
   description:
     - "Pass --dsv4 to run_benchmark_serving so MTP benchmarks use the DSv4 chat template (PR #1153)"
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/1182
+
+- config-keys:
+    - gptoss-fp4-mi355x-atom
+  description:
+    - "Update GPTOSS-120B FP4 MI355X Atom benchmark (rocm/atom:rocm7.2.2_ubuntu24.04_py3.12_pytorch_release_2.10.0_atom0.1.2.post)"
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/1195