diff --git a/.github/workflows/ci-cache-warmup-platform-jobs.yml b/.github/workflows/ci-cache-warmup-platform-jobs.yml
index 38ca56e5750..8a169323b12 100644
--- a/.github/workflows/ci-cache-warmup-platform-jobs.yml
+++ b/.github/workflows/ci-cache-warmup-platform-jobs.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        runner: [ubuntu-24.04-arm, blacksmith-4vcpu-ubuntu-2404]
+        runner: [ubuntu-24.04-arm, blacksmith-8vcpu-ubuntu-2404]
     runs-on: ${{ matrix.runner }}
     timeout-minutes: 10
     env:
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 9012ae68c31..01f3fde8c72 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -894,7 +894,7 @@ jobs:
     uses: ./.github/workflows/unit-tests.yml
     with:
       node_versions: '["24"]'
-      runner: blacksmith-4vcpu-ubuntu-2404
+      runner: blacksmith-8vcpu-ubuntu-2404
       phase_diagnostics: true
       shards: ${{ needs.preflight.outputs.shards }}
       run_shards: ${{ needs.code_paths.outputs.mobile_ci_tools != 'true' }}
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index ec75664be85..5db6fda346e 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -175,7 +175,7 @@ jobs:
           export ORCA_SHARD_SOURCE_SHA
           node config/scripts/run-vitest.mjs run --config config/vitest.config.ts \
             --shard=${{ matrix.shard.index }}/${{ matrix.shard.count }} \
-            ${{ (runner.arch == 'ARM64' || inputs.runner == 'blacksmith-4vcpu-ubuntu-2404') && '--maxWorkers=4' || '' }}
+            ${{ inputs.runner == 'blacksmith-8vcpu-ubuntu-2404' && '--maxWorkers=8' || (runner.arch == 'ARM64' || inputs.runner == 'blacksmith-4vcpu-ubuntu-2404') && '--maxWorkers=4' || '' }}
 
       - name: Seal unit module cache
         id: module-cache-seal
diff --git a/config/scripts/ci-dependency-download-cache.test.mjs b/config/scripts/ci-dependency-download-cache.test.mjs
index 8db4ab39c40..6564daa6447 100644
--- a/config/scripts/ci-dependency-download-cache.test.mjs
+++ b/config/scripts/ci-dependency-download-cache.test.mjs
@@ -375,7 +375,7 @@ describe('CI dependency download caches', () => {
     expect(warm['runs-on']).toBe('${{ matrix.runner }}')
     expect(warm.strategy.matrix.runner).toEqual(['ubuntu-24.04-arm', pr.jobs.test.with.runner])
     expect(pr.jobs.preflight['runs-on']).toBe('blacksmith-8vcpu-ubuntu-2404')
-    expect(pr.jobs.test.with.runner).toBe('blacksmith-4vcpu-ubuntu-2404')
+    expect(pr.jobs.test.with.runner).toBe('blacksmith-8vcpu-ubuntu-2404')
     expect(units['runs-on']).toBe('${{ inputs.runner }}')
     expect(JSON.parse(pr.jobs.test.with.node_versions)).toEqual(['24'])
     expect(warmInstall.if).toBeUndefined()
diff --git a/config/scripts/ci-unit-module-cache.test.mjs b/config/scripts/ci-unit-module-cache.test.mjs
index c054d4be878..d2cbb470e6d 100644
--- a/config/scripts/ci-unit-module-cache.test.mjs
+++ b/config/scripts/ci-unit-module-cache.test.mjs
@@ -162,6 +162,12 @@ it('retains four workers on ARM and the four-core Blacksmith unit runner', () =>
       '--maxWorkers=4'
     )
   }
+  expect(
+    runInNewContext(expression, {
+      runner: { arch: 'X64' },
+      inputs: { runner: 'blacksmith-8vcpu-ubuntu-2404' }
+    })
+  ).toBe('--maxWorkers=8')
   expect(
     runInNewContext(expression, { runner: { arch: 'X64' }, inputs: { runner: 'ubuntu-latest' } })
   ).toBe('')