diff --git a/install.ps1 b/install.ps1
index dccd8e4fc1..1073ab5726 100644
--- a/install.ps1
+++ b/install.ps1
@@ -1553,7 +1553,9 @@ shell.Run cmd, 0, False
             $HipSdkInstalled = $true   # binary found → SDK is installed regardless of device state
             try {
                 $hipOut = & $hipinfoExe.Source 2>&1 | Out-String
-                if ($LASTEXITCODE -eq 0 -and $hipOut -match "(?i)gcnArchName") {
+                if ($hipOut -match "(?i)gcnArchName") {
+                    # hipinfo can crash after printing gcnArchName (#6043).
+                    # Once the arch is printed, keep the ROCm wheel path.
                     $HasROCm = $true
                     $_hipAllArches = @([regex]::Matches($hipOut, "(?im)^\s*gcnArchName\s*:\s*(\S+)") | ForEach-Object { ($_.Groups[1].Value -split ':')[0].Trim().ToLower() })
                     $_hipVisIdx = if ($env:HIP_VISIBLE_DEVICES -match '^\d') { [int]($env:HIP_VISIBLE_DEVICES -split ',')[0] } elseif ($env:ROCR_VISIBLE_DEVICES -match '^\d') { [int]($env:ROCR_VISIBLE_DEVICES -split ',')[0] } else { 0 }
@@ -1563,8 +1565,13 @@ shell.Run cmd, 0, False
                     } else {
                         $ROCmGpuLabel = "AMD ROCm"
                     }
+                    if ($LASTEXITCODE -ne 0) {
+                        Write-Host "  [INFO] hipinfo exited with code $LASTEXITCODE but reported gcnArchName -- treating as ROCm-capable (see #6043)" -ForegroundColor Cyan
+                    }
                 } elseif ($LASTEXITCODE -ne 0) {
-                    # hipinfo ran but returned a HIP runtime error (e.g. "no ROCm-capable device detected")
+                    # hipinfo ran but returned a HIP runtime error without any gcnArchName
+                    # output (e.g. "no ROCm-capable device detected"), or crashed before
+                    # printing device info.
                     $firstLine = ($hipOut -split '\r?\n' | Where-Object { $_.Trim() } | Select-Object -First 1)
                     Write-Host "  [WARN] hipinfo returned a HIP runtime error (exit $LASTEXITCODE)" -ForegroundColor Yellow
                     Write-Host "         $firstLine" -ForegroundColor Yellow
diff --git a/studio/install_python_stack.py b/studio/install_python_stack.py
index d404041ca7..a8bd73ad9b 100644
--- a/studio/install_python_stack.py
+++ b/studio/install_python_stack.py
@@ -354,16 +354,20 @@ def _detect_windows_gfx_arch() -> str | None:
                 stderr = subprocess.DEVNULL,
                 timeout = 10,
             )
-            if result.returncode == 0:
-                text = result.stdout.decode(errors = "replace")
-                # findall gets every gcnArchName line so multi-GPU hosts are
-                # enumerable and HIP_VISIBLE_DEVICES selects correctly.
-                _tokens = [
-                    t.strip().lower() for t in re.findall(r"(?im)^\s*gcnArchName\s*:\s*(\S+)", text)
-                ]
-                _pick = _dedup_pick(_tokens)
-                if _pick:
-                    return _pick
+            # Accept partial output even when hipinfo crashes (e.g. exit code
+            # 0xC0000005 / STATUS_ACCESS_VIOLATION on some RDNA 4 hosts): if
+            # gcnArchName is present in stdout the device was enumerated before
+            # the crash, so the arch is trustworthy.  Ignoring it causes a
+            # silent CPU PyTorch fallback (issue #6043).
+            text = result.stdout.decode(errors = "replace")
+            # findall gets every gcnArchName line so multi-GPU hosts are
+            # enumerable and HIP_VISIBLE_DEVICES selects correctly.
+            _tokens = [
+                t.strip().lower() for t in re.findall(r"(?im)^\s*gcnArchName\s*:\s*(\S+)", text)
+            ]
+            _pick = _dedup_pick(_tokens)
+            if _pick:
+                return _pick
         except Exception:
             pass
 
diff --git a/studio/setup.ps1 b/studio/setup.ps1
index acc7e92875..f02ed586be 100644
--- a/studio/setup.ps1
+++ b/studio/setup.ps1
@@ -823,7 +823,9 @@ if (-not $HasNvidiaSmi) {
         $HipSdkInstalled = $true   # binary found → SDK is installed regardless of device state
         try {
             $hipOut = & $hipinfoExe.Source 2>&1 | Out-String
-            if ($LASTEXITCODE -eq 0 -and $hipOut -match "(?i)gcnArchName") {
+            if ($hipOut -match "(?i)gcnArchName") {
+                # hipinfo can crash after printing gcnArchName (#6043).
+                # Once the arch is printed, keep the ROCm wheel path.
                 $HasROCm = $true
                 $_hipAllArches = @([regex]::Matches($hipOut, "(?im)^\s*gcnArchName\s*:\s*(\S+)") | ForEach-Object { ($_.Groups[1].Value -split ':')[0].Trim().ToLower() })
                 $_hipVisIdx = if ($env:HIP_VISIBLE_DEVICES -match '^\d') { [int]($env:HIP_VISIBLE_DEVICES -split ',')[0] } elseif ($env:ROCR_VISIBLE_DEVICES -match '^\d') { [int]($env:ROCR_VISIBLE_DEVICES -split ',')[0] } else { 0 }
@@ -833,8 +835,13 @@ if (-not $HasNvidiaSmi) {
                 } else {
                     $ROCmGpuLabel = "AMD ROCm"
                 }
+                if ($LASTEXITCODE -ne 0) {
+                    substep "[INFO] hipinfo exited with code $LASTEXITCODE but reported gcnArchName -- treating as ROCm-capable (see #6043)" "Cyan"
+                }
             } elseif ($LASTEXITCODE -ne 0) {
-                # hipinfo ran but returned a HIP runtime error (e.g. "no ROCm-capable device detected")
+                # hipinfo ran but returned a HIP runtime error without any gcnArchName
+                # output (e.g. "no ROCm-capable device detected"), or crashed before
+                # printing device info.
                 $firstLine = ($hipOut -split '\r?\n' | Where-Object { $_.Trim() } | Select-Object -First 1)
                 substep "[WARN] hipinfo returned a HIP runtime error (exit $LASTEXITCODE)" "Yellow"
                 substep "       $firstLine" "Yellow"
diff --git a/tests/studio/install/test_rocm_support.py b/tests/studio/install/test_rocm_support.py
index a3c9555d0b..b0abaaeacd 100644
--- a/tests/studio/install/test_rocm_support.py
+++ b/tests/studio/install/test_rocm_support.py
@@ -1820,10 +1820,27 @@ class TestDetectWindowsGfxArch:
                 result = stack_mod._detect_windows_gfx_arch()
         assert result == "gfx1200"
 
-    def test_returns_none_on_nonzero_returncode(self):
+    def test_returns_arch_on_crash_with_gcnarchname_in_output(self):
+        # Regression test for issue #6043: hipinfo may exit with a non-zero
+        # code (e.g. 0xC0000005 / STATUS_ACCESS_VIOLATION on RDNA 4 hosts)
+        # while still printing the gcnArchName line before crashing.  The
+        # previous guard `if result.returncode == 0` discarded this output,
+        # causing a CPU PyTorch fallback.  The fix: accept the arch whenever
+        # gcnArchName is present in stdout regardless of exit code.
+        mock_result = MagicMock()
+        mock_result.returncode = -1073741819  # 0xC0000005 STATUS_ACCESS_VIOLATION
+        mock_result.stdout = b"gcnArchName : gfx1200\nsome other line\n"
+        with patch("shutil.which", return_value = "/usr/bin/hipinfo"):
+            with patch("subprocess.run", return_value = mock_result):
+                result = stack_mod._detect_windows_gfx_arch()
+        assert result == "gfx1200"
+
+    def test_returns_none_on_nonzero_returncode_without_gcnarchname(self):
+        # Non-zero exit without any gcnArchName output (e.g. no device detected)
+        # must still return None and fall through to amd-smi / WMI.
         mock_result = MagicMock()
         mock_result.returncode = 1
-        mock_result.stdout = b"gcnArchName : gfx1200\n"
+        mock_result.stdout = b"HIP runtime error: no device detected\n"
         with patch("shutil.which", return_value = "/usr/bin/hipinfo"):
             with patch("subprocess.run", return_value = mock_result):
                 result = stack_mod._detect_windows_gfx_arch()
@@ -2673,6 +2690,15 @@ class TestHipSdkEnvPathResolution:
     """Verify that both install scripts resolve hipinfo/hipconfig via HIP_PATH
     and ROCM_PATH when the tools are not on $PATH, and emit explicit warnings."""
 
+    @staticmethod
+    def _assert_accepts_partial_hipinfo_output(source: str):
+        hipout_idx = source.find("$hipOut = & $hipinfoExe.Source")
+        assert hipout_idx != -1
+        hipinfo_block = source[hipout_idx : hipout_idx + 1600]
+        assert 'if ($hipOut -match "(?i)gcnArchName")' in hipinfo_block
+        assert "$LASTEXITCODE -eq 0 -and $hipOut -match" not in hipinfo_block
+        assert "but reported gcnArchName" in hipinfo_block
+
     # ── hipinfo resolution ────────────────────────────────────────────────────
 
     def test_setup_checks_hip_path_for_hipinfo(self):
@@ -2747,6 +2773,16 @@ class TestHipSdkEnvPathResolution:
         source = _INSTALL_PS1_PATH.read_text(encoding = "utf-8")
         assert "HIP runtime error" in source or "runtime error" in source.lower()
 
+    def test_setup_accepts_hipinfo_gcnarchname_on_nonzero_exit(self):
+        """setup.ps1 must accept partial hipinfo output from the #6043 crash path."""
+        source = _SETUP_PS1_PATH.read_text(encoding = "utf-8")
+        self._assert_accepts_partial_hipinfo_output(source)
+
+    def test_install_accepts_hipinfo_gcnarchname_on_nonzero_exit(self):
+        """install.ps1 must accept partial hipinfo output from the #6043 crash path."""
+        source = _INSTALL_PS1_PATH.read_text(encoding = "utf-8")
+        self._assert_accepts_partial_hipinfo_output(source)
+
     # ── hipconfig resolution ──────────────────────────────────────────────────
 
     def test_setup_resolves_hipconfig_via_bin_subdir(self):