diff --git a/src/duckstation-qt/gamepropertiesdialog.cpp b/src/duckstation-qt/gamepropertiesdialog.cpp
index a8c01e375..c104cd784 100644
--- a/src/duckstation-qt/gamepropertiesdialog.cpp
+++ b/src/duckstation-qt/gamepropertiesdialog.cpp
@@ -2,6 +2,7 @@
 #include "common/cd_image.h"
 #include "common/cd_image_hasher.h"
 #include "core/settings.h"
+#include "core/system.h"
 #include "frontend-common/game_list.h"
 #include "qthostinterface.h"
 #include "qtprogresscallback.h"
@@ -254,6 +255,18 @@ void GamePropertiesDialog::populateGameSettings()
     m_trait_checkboxes[i]->setChecked(gs.HasTrait(static_cast<GameSettings::Trait>(i)));
   }
 
+  if (gs.cpu_overclock_numerator.has_value() || gs.cpu_overclock_denominator.has_value())
+  {
+    const u32 numerator = gs.cpu_overclock_numerator.value_or(1);
+    const u32 denominator = gs.cpu_overclock_denominator.value_or(1);
+    const u32 percent = Settings::CPUOverclockFractionToPercent(numerator, denominator);
+    QSignalBlocker sb(m_ui.userCPUClockSpeed);
+    m_ui.userCPUClockSpeed->setValue(static_cast<int>(percent));
+  }
+
+  populateBooleanUserSetting(m_ui.userEnableCPUClockSpeedControl, gs.cpu_overclock_enable);
+  updateCPUClockSpeedLabel();
+
   if (gs.display_active_start_offset.has_value())
   {
     QSignalBlocker sb(m_ui.displayActiveStartOffset);
@@ -385,6 +398,28 @@ void GamePropertiesDialog::connectUi()
     m_ui.exportCompatibilityInfo->setVisible(show_buttons);
   });
 
+  connectBooleanUserSetting(m_ui.userEnableCPUClockSpeedControl, &m_game_settings.cpu_overclock_enable);
+  connect(m_ui.userEnableCPUClockSpeedControl, &QCheckBox::stateChanged, this,
+          &GamePropertiesDialog::updateCPUClockSpeedLabel);
+
+  connect(m_ui.userCPUClockSpeed, &QSlider::valueChanged, [this](int value) {
+    if (value == 100)
+    {
+      m_game_settings.cpu_overclock_numerator.reset();
+      m_game_settings.cpu_overclock_denominator.reset();
+    }
+    else
+    {
+      u32 numerator, denominator;
+      Settings::CPUOverclockPercentToFraction(static_cast<u32>(value), &numerator, &denominator);
+      m_game_settings.cpu_overclock_numerator = numerator;
+      m_game_settings.cpu_overclock_denominator = denominator;
+    }
+
+    saveGameSettings();
+    updateCPUClockSpeedLabel();
+  });
+
   connect(m_ui.userAspectRatio, QOverload<int>::of(&QComboBox::currentIndexChanged), [this](int index) {
     if (index <= 0)
       m_game_settings.display_aspect_ratio.reset();
@@ -514,6 +549,13 @@ void GamePropertiesDialog::connectUi()
   });
 }
 
+void GamePropertiesDialog::updateCPUClockSpeedLabel()
+{
+  const int percent = m_ui.userCPUClockSpeed->value();
+  const double frequency = (static_cast<double>(System::MASTER_CLOCK) * static_cast<double>(percent)) / 100.0;
+  m_ui.userCPUClockSpeedLabel->setText(tr("%1% (%2MHz)").arg(percent).arg(frequency / 1000000.0, 0, 'f', 2));
+}
+
 void GamePropertiesDialog::fillEntryFromUi(GameListCompatibilityEntry* entry)
 {
   entry->code = m_ui.gameCode->text().toStdString();
diff --git a/src/duckstation-qt/gamepropertiesdialog.h b/src/duckstation-qt/gamepropertiesdialog.h
index ed2e74aab..d3fde36ac 100644
--- a/src/duckstation-qt/gamepropertiesdialog.h
+++ b/src/duckstation-qt/gamepropertiesdialog.h
@@ -36,6 +36,7 @@ private Q_SLOTS:
   void onComputeHashClicked();
   void onVerifyDumpClicked();
   void onExportCompatibilityInfoClicked();
+  void updateCPUClockSpeedLabel();
 
 private:
   void setupAdditionalUi();
diff --git a/src/duckstation-qt/gamepropertiesdialog.ui b/src/duckstation-qt/gamepropertiesdialog.ui
index 47d7fff1a..3de862a54 100644
--- a/src/duckstation-qt/gamepropertiesdialog.ui
+++ b/src/duckstation-qt/gamepropertiesdialog.ui
@@ -187,6 +187,74 @@
        <string>User Settings (Console)</string>
       </attribute>
       <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QGroupBox" name="groupBox_7">
+         <property name="title">
+          <string>CPU Clock Speed Control</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_3">
+          <item row="0" column="0">
+           <layout class="QHBoxLayout" name="horizontalLayout_4">
+            <item>
+             <widget class="QCheckBox" name="userEnableCPUClockSpeedControl">
+              <property name="text">
+               <string>Enable Clock Speed Control (Overclocking/Underclocking)</string>
+              </property>
+              <property name="tristate">
+               <bool>true</bool>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <spacer name="horizontalSpacer_2">
+              <property name="orientation">
+               <enum>Qt::Horizontal</enum>
+              </property>
+              <property name="sizeHint" stdset="0">
+               <size>
+                <width>40</width>
+                <height>20</height>
+               </size>
+              </property>
+             </spacer>
+            </item>
+            <item>
+             <widget class="QLabel" name="userCPUClockSpeedLabel">
+              <property name="text">
+               <string>100% (effective 33.3mhz)</string>
+              </property>
+              <property name="alignment">
+               <set>Qt::AlignCenter</set>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item row="1" column="0">
+           <widget class="QSlider" name="userCPUClockSpeed">
+            <property name="minimum">
+             <number>10</number>
+            </property>
+            <property name="maximum">
+             <number>1000</number>
+            </property>
+            <property name="value">
+             <number>100</number>
+            </property>
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="tickPosition">
+             <enum>QSlider::TicksBothSides</enum>
+            </property>
+            <property name="tickInterval">
+             <number>50</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
        <item>
         <widget class="QGroupBox" name="groupBox_4">
          <property name="title">