diff --git a/examples/blackwell_attention.py b/examples/blackwell_attention.py
index d96697071..eeab4fe18 100644
--- a/examples/blackwell_attention.py
+++ b/examples/blackwell_attention.py
@@ -13,9 +13,11 @@
 from __future__ import annotations
 
 import math
+import os
 from typing import Callable
 
 import torch
+import triton
 from triton.testing import do_bench
 
 import helion
@@ -70,6 +72,55 @@ def _fma_f32x2(a: torch.Tensor, b: torch.Tensor, c: torch.Tensor) -> torch.Tenso
     )
 
 
+HAS_ACC = os.getenv("WITH_ACC", "0") == "1"
+if HAS_ACC:
+    ACC_OPTIONS = [0, 11, 12, 13, 14, 15]
+
+    def make_acc_option(option):
+        return {"advanced_compiler_configuration": option}
+else:
+    ACC_OPTIONS = [None]
+    make_acc_option = lambda _: {}
+
+
+def _supports_reg_auto_ws():
+    """Check if the current Triton version supports minRegAutoWS/maxRegAutoWS"""
+    try:
+        # Try to create a Config with minRegAutoWS to test support
+        test_config = triton.Config({}, minRegAutoWS=24, maxRegAutoWS=152)
+        return True
+    except (TypeError, AttributeError):
+        # Parameter not supported in this Triton version
+        return False
+
+
+HAS_REG_AUTO_WS = _supports_reg_auto_ws()
+print(f"!!!!!!!!!! {HAS_REG_AUTO_WS=} !!!!!!!!!!!!!")
+if HAS_REG_AUTO_WS:
+    REG_AUTO_WS_OPTIONS = [152, 192]
+    M_OPTIONS = [256]
+
+    def make_reg_auto_ws_option(maxreg):
+        OUTER_LOOP = True
+        return dict(
+            _triton_range_id_data_partition_factor=0,
+            _triton_range_value_data_partition_factor=2,
+            _triton_config_maxRegAutoWS=maxreg,
+            range_warp_specializes=[OUTER_LOOP or None, None if OUTER_LOOP else True],
+            range_multi_buffers=[None, False],
+        )
+else:
+    REG_AUTO_WS_OPTIONS = [None]
+    M_OPTIONS = [128]
+
+    def make_reg_auto_ws_option(maxreg):
+        return dict(
+            _triton_range_id_data_partition_factor=-1,
+            _triton_range_value_data_partition_factor=-1,
+            _triton_config_maxRegAutoWS=-1,
+        )
+
+
 # %%
 # Attention Kernel Implementation
 # -------------------------------
@@ -79,20 +130,18 @@ def _fma_f32x2(a: torch.Tensor, b: torch.Tensor, c: torch.Tensor) -> torch.Tenso
 @helion.kernel(
     configs=[
         helion.Config(
-            block_sizes=[256, N],
-            range_warp_specializes=[OUTER_LOOP or None, None if OUTER_LOOP else True],
-            range_multi_buffers=[None, False],
+            block_sizes=[M, N],
             pid_type="persistent_interleaved",
             indexing="tensor_descriptor",
             num_warps=4,
             num_stages=3,
-            _triton_range_id_data_partition_factor=0,
-            _triton_range_value_data_partition_factor=2,
-            _triton_config_maxRegAutoWS=maxreg,
+            **make_acc_option(ACC_OPTION),
+            **make_reg_auto_ws_option(REG_AUTO_WS_OPTION),
         )
+        for M in M_OPTIONS
         for N in [64, 128]
-        for OUTER_LOOP in [True]
-        for maxreg in [152, 192]
+        for ACC_OPTION in ACC_OPTIONS
+        for REG_AUTO_WS_OPTION in REG_AUTO_WS_OPTIONS
     ],
     static_shapes=True,
     autotune_accuracy_check=False,
@@ -136,12 +185,14 @@ def blackwell_attention_kernel(
     assert M % block_m == 0
     assert N % block_n == 0
     hl.register_tunable(
-        "_triton_range_id_data_partition_factor", EnumFragment(choices=(0,))
+        "_triton_range_id_data_partition_factor", EnumFragment(choices=(-1, 0))
+    )
+    hl.register_tunable(
+        "_triton_range_value_data_partition_factor", EnumFragment(choices=(-1, 2))
     )
     hl.register_tunable(
-        "_triton_range_value_data_partition_factor", EnumFragment(choices=(2,))
+        "_triton_config_maxRegAutoWS", EnumFragment(choices=(-1, 152, 192))
     )
-    hl.register_tunable("_triton_config_maxRegAutoWS", EnumFragment(choices=(152, 192)))
     SUBTILING = True
     VECT_MUL = 1
     qk_scale = qk_scale * 1.44269504  # 1/log(2)
diff --git a/helion/_compiler/device_function.py b/helion/_compiler/device_function.py
index 4d60c339e..3ed57e86c 100644
--- a/helion/_compiler/device_function.py
+++ b/helion/_compiler/device_function.py
@@ -228,7 +228,7 @@ def __init__(self, name: str, config: Config, codegen: GenerateAST) -> None:
             + [
                 x.removeprefix("_triton_config_")
                 for x in config
-                if x.startswith("_triton_config_")
+                if x.startswith("_triton_config_") and config[x] != -1
             ]
         )
         self._variable_renames: dict[str, list[str]] = {}
@@ -614,6 +614,10 @@ def codegen_function_call(self) -> ast.AST:
         if any(self.config.range_warp_specializes):
             num_warps = max(4, num_warps)
 
+        print(
+            type(self.config["_triton_config_maxRegAutoWS"]),
+            self.config["_triton_config_maxRegAutoWS"],
+        )
         args.extend(
             [
                 f"num_warps={num_warps}",
@@ -622,7 +626,7 @@ def codegen_function_call(self) -> ast.AST:
             + [
                 f"{x.removeprefix('_triton_config_')}={self.config[x]}"
                 for x in self.config
-                if x.startswith("_triton_config_")
+                if x.startswith("_triton_config_") and self.config[x] != -1
             ]
         )
         advanced_compiler_configuration = self.config.advanced_compiler_configuration
diff --git a/helion/autotuner/base_search.py b/helion/autotuner/base_search.py
index 2982120d8..904841303 100644
--- a/helion/autotuner/base_search.py
+++ b/helion/autotuner/base_search.py
@@ -295,7 +295,7 @@ def benchmark_function(self, config: Config, fn: CompiledConfig) -> float:
             self.log.debug(lambda: f"Running {config} at {datetime.datetime.now()}")
             t0 = time.perf_counter()
             # HACK: run checks multiple times to detect data races
-            for _ in range(5):
+            for _ in range(1):
                 if self._kernel_mutates_args:
                     self.args = self._clone_args(self._original_args)
                 torch.accelerator.synchronize()