diff --git a/.github/workflows/fbgemm_gpu_ci_genai.yml b/.github/workflows/fbgemm_gpu_ci_genai.yml
index c7f79afa9b..8017374b3b 100644
--- a/.github/workflows/fbgemm_gpu_ci_genai.yml
+++ b/.github/workflows/fbgemm_gpu_ci_genai.yml
@@ -70,7 +70,7 @@ jobs:
       fail-fast: false
       matrix:
         host-machine: [
-          { arch: x86, instance: "linux.24xlarge" },
+          { arch: x86, instance: "linux.8xlarge.memory" },
         ]
         python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
         cuda-version: [ "11.8.0", "12.6.3", "12.8.0" ]
diff --git a/.github/workflows/fbgemm_gpu_release_genai.yml b/.github/workflows/fbgemm_gpu_release_genai.yml
index e81b081e36..6a0d9627b3 100644
--- a/.github/workflows/fbgemm_gpu_release_genai.yml
+++ b/.github/workflows/fbgemm_gpu_release_genai.yml
@@ -69,7 +69,7 @@ jobs:
       fail-fast: false
       matrix:
         host-machine: [
-          { arch: x86, instance: "linux.24xlarge" },
+          { arch: x86, instance: "linux.12xlarge.memory" },
         ]
         python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
         cuda-version: [ "11.8.0", "12.6.3", "12.8.0" ]