diff --git a/test/test_profiler.py b/test/test_profiler.py
index 01a760153e..fbe486923d 100644
--- a/test/test_profiler.py
+++ b/test/test_profiler.py
@@ -172,7 +172,10 @@ class TestProfiler(unittest.TestCase):
     for (i1, d1), (i2, d2) in pairs:
       cpu_diff = d1.gpu2cpu_compute_time_diff - d2.gpu2cpu_compute_time_diff
       jitter_matrix[i1][i2] = statistics.median(_sync_d2d(d1, d2) - _sync_d2d(d2, d1) for _ in range(20)) / 2 - cpu_diff
-      assert abs(jitter_matrix[i1][i2]) < 0.5, "jitter should be less than 0.5ms"
+
+    for (i1, d1), (i2, d2) in pairs:
+      assert abs(jitter_matrix[i1][i2]) < 0.5, "jitter should be less than 0.5us"
+
     print("pairwise clock jitter matrix (us):\n" + '\n'.join([''.join([f'{float(item):8.3f}' for item in row]) for row in jitter_matrix]))
 
   def test_cpu_profile(self):
diff --git a/tinygrad/runtime/support/hcq.py b/tinygrad/runtime/support/hcq.py
index bc010065fd..16fda389ac 100644
--- a/tinygrad/runtime/support/hcq.py
+++ b/tinygrad/runtime/support/hcq.py
@@ -426,10 +426,10 @@ class HCQCompiled(Compiled, Generic[SignalType]):
       et = time.perf_counter_ns()
       return (decimal.Decimal(et+st) / 2000) - d.timeline_signal.timestamp
 
-    gpu2cpu_compute_time_diff = statistics.median([_sync(self, self.hw_compute_queue_t) for _ in range(40)])
+    self.gpu2cpu_compute_time_diff = statistics.median([_sync(self, self.hw_compute_queue_t) for _ in range(40)])
     if self.hw_copy_queue_t is None: gpu2cpu_copy_time_diff = decimal.Decimal(0)
     else: gpu2cpu_copy_time_diff = statistics.median([_sync(self, self.hw_copy_queue_t) for _ in range(40)])
-    Compiled.profile_events += [ProfileDeviceEvent(self.device, gpu2cpu_compute_time_diff, gpu2cpu_copy_time_diff, props=self.device_props())]
+    Compiled.profile_events += [ProfileDeviceEvent(self.device, self.gpu2cpu_compute_time_diff, gpu2cpu_copy_time_diff, props=self.device_props())]
 
   def _wrap_timeline_signal(self):
     self.timeline_signal, self._shadow_timeline_signal, self.timeline_value = self._shadow_timeline_signal, self.timeline_signal, 1