diff --git a/kernel_tuner/observers/amd.py b/kernel_tuner/observers/amd.py
index 2ff8e8c5..bf73f218 100644
--- a/kernel_tuner/observers/amd.py
+++ b/kernel_tuner/observers/amd.py
@@ -3,8 +3,14 @@
 import numpy as np
 import time
 
+# Trapz was renamed to trapezoid in Numpy 2.0
+try:
+    from numpy import trapezoid
+except ImportError:
+    from numpy import trapz as trapezoid
+
 from uuid import UUID
-from kernel_tuner.observers import BenchmarkObserver
+from kernel_tuner.observers import BenchmarkObserver, ContinuousObserver
 
 logger = logging.getLogger(__name__)
 
@@ -65,15 +71,161 @@ def _find_device_by_bdf(devices, pci_domain, pci_bus, pci_device):
     return result
 
 
+class AMDDevice:
+    def __init__(self, device):
+        self.device = device
+
+    def total_energy_usage(self):
+        """Returns total energy usage since startup."""
+
+        result = amdsmi.amdsmi_get_energy_count(self.device)
+
+        # This field changed name in rocm 6.4
+        if "energy_accumulator" not in result:
+            if "power" in result:
+                result["energy_accumulator"] = result["power"]
+            else:
+                raise RuntimeError(f"invalid result from amdsmi_get_energy_count: {result}")
+
+        return result
+
+    def current_power_usage(self):
+        info = amdsmi.amdsmi_get_power_info(self.device)
+
+        if "current_socket_power" in info:
+            # For newer Mi300+ cards
+            return info["current_socket_power"]
+        elif "average_socket_power" in info:
+            # For older cards
+            return info["average_socket_power"]
+        else:
+            raise RuntimeError(f"invalid result from amdsmi_get_power_info: {info}")
+
+    def core_voltage(self):
+        """Returns current voltage in Volt."""
+
+        milli_volt = amdsmi.amdsmi_get_gpu_volt_metric(
+            self.device,
+            amdsmi.AmdSmiVoltageType.VDDGFX,
+            amdsmi.AmdSmiVoltageMetric.CURRENT,
+        )
+
+        # milli * 1-e3 -> volt
+        return milli_volt * 1e-3
+
+    def temperature(self):
+        """Returns current temperature in celcius."""
+        return amdsmi.amdsmi_get_temp_metric(
+            self.device,
+            amdsmi.AmdSmiTemperatureType.HOTSPOT,
+            amdsmi.AmdSmiTemperatureMetric.CURRENT,
+        )
+
+    def mem_temperature(self):
+        """Returns current temperature in celcius."""
+        return amdsmi.amdsmi_get_temp_metric(
+            self.device,
+            amdsmi.AmdSmiTemperatureType.VRAM,
+            amdsmi.AmdSmiTemperatureMetric.CURRENT,
+        )
+
+    def core_freq(self):
+        """Returns current core clock frequency in Hz."""
+        obj = amdsmi.amdsmi_get_clk_freq(self.device, amdsmi.AmdSmiClkType.GFX)
+        freq = obj["frequency"][obj["current"]]
+        return freq
+
+    def mem_freq(self):
+        """Returns current memory clock frequency in Hz."""
+        obj = amdsmi.amdsmi_get_clk_freq(self.device, amdsmi.AmdSmiClkType.MEM)
+        freq = obj["frequency"][obj["current"]]
+        return freq
+
+    def core_activity(self):
+        """Returns core usage as percentage (0-100)."""
+        obj = amdsmi.amdsmi_get_gpu_activity(self.device)
+        result = obj["gfx_activity"]
+        # Result is "N/A" on error, return NaN instead
+        return float("nan") if isinstance(result, str) else result
+
+    def mem_activity(self):
+        """Returns memory usage as percentage (0-100)."""
+        obj = amdsmi.amdsmi_get_gpu_activity(self.device)
+        result = obj["umc_activity"]
+        # Result is "N/A" on error, return NaN instead
+        return float("nan") if isinstance(result, str) else result
+
+
 SUPPORTED_OBSERVABLES = [
     "energy",
+    "power",
     "core_freq",
     "mem_freq",
     "temperature",
+    "mem_temperature",
     "core_voltage",
+    "core_activity",
+    "mem_activity",
 ]
 
 
+class AMDSMIContinuousObserver(ContinuousObserver):
+    def __init__(self, parent, continuous_duration=1.0):
+        self.parent = parent
+        self.continuous_duration = continuous_duration
+        self.warmup_time = min(0.1, continuous_duration / 2)
+
+        # This assigned by Kernel Tuner's core
+        self.results = None
+
+    def before_start(self):
+        self.parent.before_start()
+
+    def after_start(self):
+        self.warmup_completed = False
+        self.start_time = time.perf_counter() + self.warmup_time
+
+    def during(self):
+        now = time.perf_counter()
+
+        if not self.warmup_completed:
+            if now < self.start_time:
+                return
+
+            # Only call `after_start` once warmup time has passed
+            self.start_time = now
+            self.warmup_completed = True
+            self.parent.after_start()
+
+        self.parent.during()
+
+    def after_finish(self):
+        if self.warmup_completed:
+            self.parent.after_finish()
+
+    def get_results(self):
+        if not self.warmup_completed:
+            return dict()
+
+        elapsed_sec = time.perf_counter() - self.start_time
+        time_sec = self.results["time"] * 1e-3
+        ratio = time_sec / elapsed_sec
+
+        # Get results from the parent
+        results = self.parent.get_results()
+
+        # The energy field measures the energy over the entire
+        # continuous duration. However, we want the average
+        # energy usage _per_ kernel. To fix this, we multiply
+        # by the ratio of elapsed time to time per kernel
+        energy_field = self.parent.field_name("energy")
+
+        if energy_field in results:
+            results[energy_field] = results[energy_field] * ratio
+
+        return results
+
+
 class AMDSMIObserver(BenchmarkObserver):
     """
     BenchmarkObserver that uses amdsmi to monitor AMD GPUs and measure energy usage (`energy`),
@@ -81,7 +233,15 @@ class AMDSMIObserver(BenchmarkObserver):
     and core voltage (`core_voltage`).
     """
 
-    def __init__(self, observables=["energy"], *, device_id=None, prefix="amdsmi"):
+    def __init__(
+        self,
+        observables=["energy"],
+        *,
+        device_id=None,
+        prefix="amdsmi",
+        use_continuous_observer=True,
+        continuous_duration=1.0,
+    ):
         """
         Initialize the AMDSMIObserver.
 
@@ -96,10 +256,12 @@ def __init__(self, observables=["energy"], *, device_id=None, prefix="amdsmi"):
                 raise ValueError(f"Observable {obs} not supported: {SUPPORTED_OBSERVABLES}")
 
         self.observables = set(observables)
-        self.iteration_results = {k: [] for k in self.observables}
         self.prefix = prefix
         self.device_id = device_id
         self.device = None
+        self.use_continuous_observer = use_continuous_observer
+        self.continuous_duration = continuous_duration
+        self.results_per_iteration = {self.field_name(k): [] for k in self.observables}
 
     def register_device(self, dev):
         amdsmi.amdsmi_init()
@@ -125,119 +287,115 @@ def register_device(self, dev):
                 raise ValueError(f"failed to detect AMD device: invalid UUID of backend: {uuid}")
 
             if pci_idx is None:
-                raise ValueError(
-                    f"failed to detect AMD device: invalid PCI information of backend: {bdf}"
-                )
+                raise ValueError(f"failed to detect AMD device: invalid PCI information of backend: {bdf}")
 
             if uuid_idx != pci_idx:
-                raise ValueError(
-                    "failed to detect AMD device: UUID and PCI information are inconsistent"
-                )
+                raise ValueError("failed to detect AMD device: UUID and PCI information are inconsistent")
 
             self.device_id = uuid_idx
             logger.info(f"selected AMDSMI device {self.device_id}")
 
         # Warn if UUID wants a different device
         if uuid_idx is not None and self.device_id != uuid_idx:
-            logger.warning(
-                f"specified device has mismatching UUID ({uuid}): {uuid_idx} != {self.device_id}"
-            )
+            logger.warning(f"specified device has mismatching UUID ({uuid}): {uuid_idx} != {self.device_id}")
 
         # Warn if PCI wants a different device
         if pci_idx is not None and self.device_id != pci_idx:
-            logger.warning(
-                f"specified device has mismatching PCI ({bdf}): {pci_idx} != {self.device_id}"
-            )
+            logger.warning(f"specified device has mismatching PCI ({bdf}): {pci_idx} != {self.device_id}")
 
         if not (0 <= self.device_id < len(devices)):
-            raise ValueError(
-                f"invalid AMD SMI device_id {self.device_id}, found {len(devices)} devices"
-            )
+            raise ValueError(f"invalid AMD SMI device_id {self.device_id}, found {len(devices)} devices")
+
+        self.device = AMDDevice(devices[self.device_id])
 
-        self.device = devices[self.device_id]
+        if self.use_continuous_observer:
+            self.continuous_observer = AMDSMIContinuousObserver(self, continuous_duration=self.continuous_duration)
 
     def after_start(self):
-        self.energy_after_start = amdsmi.amdsmi_get_energy_count(self.device)
-        self.during_timestamps = []
-        self.during_results = {k: [] for k in self.observables if k != "energy"}
-        self.during()
+        self.energy_after_start = self.device.total_energy_usage()
+        self.sample_timestamps = []
+        self.sample_values = {k: [] for k in self.results_per_iteration}
+        self.sample_metrics()
 
     def during(self):
-        # Get the current timestamp for measurements
-        self.during_timestamps.append(time.perf_counter())
+        self.sample_metrics()
 
-        if "core_voltage" in self.observables:
-            milli_volt = amdsmi.amdsmi_get_gpu_volt_metric(
-                self.device,
-                amdsmi.AmdSmiVoltageType.VDDGFX,
-                amdsmi.AmdSmiVoltageMetric.CURRENT,
-            )
+    def field_name(self, name):
+        if self.prefix:
+            return f"{self.prefix}_{name}"
+        else:
+            return name
+
+    def store_sample(self, name, value):
+        self.sample_values[self.field_name(name)].append(value)
 
-            # milli * 1-e3 -> volt
-            self.during_results["core_voltage"].append(milli_volt * 1e-3)
+    def sample_metrics(self):
+        self.sample_timestamps.append(time.perf_counter())
+
+        if "core_voltage" in self.observables:
+            self.store_sample("core_voltage", self.device.core_voltage())
 
         if "core_freq" in self.observables:
-            obj = amdsmi.amdsmi_get_clk_freq(self.device, amdsmi.AmdSmiClkType.GFX)
-            freq = obj["frequency"][obj["current"]]
-            self.during_results["core_freq"].append(freq)
+            self.store_sample("core_freq", self.device.core_freq())
 
         if "mem_freq" in self.observables:
-            obj = amdsmi.amdsmi_get_clk_freq(self.device, amdsmi.AmdSmiClkType.MEM)
-            freq = obj["frequency"][obj["current"]]
-            self.during_results["mem_freq"].append(freq)
+            self.store_sample("mem_freq", self.device.mem_freq())
 
         if "temperature" in self.observables:
-            temp = amdsmi.amdsmi_get_temp_metric(
-                self.device,
-                amdsmi.AmdSmiTemperatureType.HOTSPOT,
-                amdsmi.AmdSmiTemperatureMetric.CURRENT,
-            )
+            self.store_sample("temperature", self.device.temperature())
+
+        if "mem_temperature" in self.observables:
+            self.store_sample("mem_temperature", self.device.mem_temperature())
 
-            self.during_results["temperature"].append(temp)
+        if "core_activity" in self.observables:
+            self.store_sample("core_activity", self.device.core_activity())
+
+        if "mem_activity" in self.observables:
+            self.store_sample("mem_activity", self.device.mem_activity())
 
     def after_finish(self):
-        self.during()
+        before = self.energy_after_start
+        after = self.device.total_energy_usage()
+        self.sample_metrics()
+
+        diff = np.uint64(after["energy_accumulator"]) - np.uint64(before["energy_accumulator"])
+        elapsed_ns = np.uint64(after["timestamp"]) - np.uint64(before["timestamp"])
+        resolution = before["counter_resolution"]
+        energy_uj = float(diff) * float(resolution)
 
         # Energy is an exception as it does not need integration over time
         if "energy" in self.observables:
-            before = self.energy_after_start
-            after = amdsmi.amdsmi_get_energy_count(self.device)
-
-            # This field changed names in rocm 6.4
-            if "energy_accumulator" in before:
-                energy_field = "energy_accumulator"
-            elif "power" in before:
-                energy_field = "power"
-            else:
-                raise RuntimeError(f"invalid result from amdsmi_get_energy_count: {before}")
+            # microJ * 1e-6 -> J
+            self.results_per_iteration[self.field_name("energy")].append(energy_uj * 1e-6)
 
-            diff = np.uint64(after[energy_field]) - np.uint64(before[energy_field])
-            resolution = before["counter_resolution"]
-            energy_mj = float(diff) * float(resolution)
+        if "power" in self.observables:
+            self.results_per_iteration[self.field_name("power")].append(energy_uj / elapsed_ns * 1e3)
 
-            # microJ * 1e-6 -> J
-            self.iteration_results["energy"].append(energy_mj * 1e-6)
+        # normalize timestamps to [0, 1] such that integral (trapezoid) is the mean
+        xs = np.array(self.sample_timestamps)
+        xs = (xs - xs.min()) / (xs.max() - xs.min())
 
-        # For the others, we integrate over time and take the average
-        x = self.during_timestamps
-        for key, values in self.during_results.items():
-            # np.trapezoid was np.trapz in older versions of np
-            avg = np.trapezoid(values, x) / np.ptp(x)
-            self.iteration_results[key].append(avg)
+        for key, values in self.sample_values.items():
+            # Could not sample, skip field
+            if not values:
+                continue
 
-    def get_results(self):
-        results = dict()
+            # If all values are the same, take that value directly.
+            # This preserve that value bitwise exactly and prevents
+            # rounding errors that occur in trapezoid
+            if all(v == values[0] for v in values):
+                result = values[0]
+            else:
+                result = trapezoid(values, x=xs)
 
-        for key in list(self.iteration_results):
-            # Average of results at each iteration
-            avg = np.average(self.iteration_results[key])
+            self.results_per_iteration[key].append(result)
 
-            # Reset to empty
-            self.iteration_results[key] = []
+    def get_results(self):
+        results = dict()
 
-            if self.prefix:
-                results[f"{self.prefix}_{key}"] = avg
-            else:
-                results[key] = avg
+        for key in list(self.results_per_iteration):
+            # Take average and reset!
+            results[key] = np.average(self.results_per_iteration[key])
+            self.results_per_iteration[key] = []
 
         return results