diff --git a/Source/Core/Core/BootManager.cpp b/Source/Core/Core/BootManager.cpp
index 5f72002545..e61f873539 100644
--- a/Source/Core/Core/BootManager.cpp
+++ b/Source/Core/Core/BootManager.cpp
@@ -67,7 +67,6 @@ public:
   bool bSetVolume = false;
   std::array<bool, MAX_BBMOTES> bSetWiimoteSource{};
   std::array<bool, SerialInterface::MAX_SI_CHANNELS> bSetPads{};
-  std::array<bool, ExpansionInterface::MAX_EXI_CHANNELS> bSetEXIDevice{};
 
 private:
   bool valid = false;
@@ -79,7 +78,6 @@ private:
   float fSyncGpuOverclock = 0;
   std::array<WiimoteSource, MAX_BBMOTES> iWiimoteSource{};
   std::array<SerialInterface::SIDevices, SerialInterface::MAX_SI_CHANNELS> Pads{};
-  std::array<ExpansionInterface::TEXIDevices, ExpansionInterface::MAX_EXI_CHANNELS> m_EXIDevice{};
 };
 
 void ConfigCache::SaveConfig(const SConfig& config)
@@ -97,12 +95,10 @@ void ConfigCache::SaveConfig(const SConfig& config)
     iWiimoteSource[i] = WiimoteCommon::GetSource(i);
 
   std::copy(std::begin(config.m_SIDevice), std::end(config.m_SIDevice), std::begin(Pads));
-  std::copy(std::begin(config.m_EXIDevice), std::end(config.m_EXIDevice), std::begin(m_EXIDevice));
 
   bSetVolume = false;
   bSetWiimoteSource.fill(false);
   bSetPads.fill(false);
-  bSetEXIDevice.fill(false);
 }
 
 void ConfigCache::RestoreConfig(SConfig* config)
@@ -135,12 +131,6 @@ void ConfigCache::RestoreConfig(SConfig* config)
     if (bSetPads[i])
       config->m_SIDevice[i] = Pads[i];
   }
-
-  for (unsigned int i = 0; i < ExpansionInterface::MAX_EXI_CHANNELS; ++i)
-  {
-    if (bSetEXIDevice[i])
-      config->m_EXIDevice[i] = m_EXIDevice[i];
-  }
 }
 
 static ConfigCache config_cache;
@@ -237,12 +227,6 @@ bool BootCore(std::unique_ptr<BootParameters> boot, const WindowSystemInfo& wsi)
     Config::AddLayer(ConfigLoaders::GenerateNetPlayConfigLoader(netplay_settings));
     StartUp.bCPUThread = netplay_settings.m_CPUthread;
     StartUp.bCopyWiiSaveNetplay = netplay_settings.m_CopyWiiSave;
-    StartUp.m_EXIDevice[0] = netplay_settings.m_EXIDevice[0];
-    StartUp.m_EXIDevice[1] = netplay_settings.m_EXIDevice[1];
-    StartUp.m_EXIDevice[2] = netplay_settings.m_EXIDevice[2];
-    config_cache.bSetEXIDevice[0] = true;
-    config_cache.bSetEXIDevice[1] = true;
-    config_cache.bSetEXIDevice[2] = true;
     StartUp.bSyncGPU = netplay_settings.m_SyncGPU;
     StartUp.iSyncGpuMaxDistance = netplay_settings.m_SyncGpuMaxDistance;
     StartUp.iSyncGpuMinDistance = netplay_settings.m_SyncGpuMinDistance;
diff --git a/Source/Core/Core/Config/MainSettings.cpp b/Source/Core/Core/Config/MainSettings.cpp
index 7f8c132c58..23a1ae99a6 100644
--- a/Source/Core/Core/Config/MainSettings.cpp
+++ b/Source/Core/Core/Config/MainSettings.cpp
@@ -54,11 +54,24 @@ const Info<std::string> MAIN_GCI_FOLDER_A_PATH_OVERRIDE{
     {System::Main, "Core", "GCIFolderAPathOverride"}, ""};
 const Info<std::string> MAIN_GCI_FOLDER_B_PATH_OVERRIDE{
     {System::Main, "Core", "GCIFolderBPathOverride"}, ""};
-const Info<int> MAIN_SLOT_A{{System::Main, "Core", "SlotA"},
-                            ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER};
-const Info<int> MAIN_SLOT_B{{System::Main, "Core", "SlotB"}, ExpansionInterface::EXIDEVICE_NONE};
-const Info<int> MAIN_SERIAL_PORT_1{{System::Main, "Core", "SerialPort1"},
-                                   ExpansionInterface::EXIDEVICE_NONE};
+
+const Info<ExpansionInterface::TEXIDevices> MAIN_SLOT_A{
+    {System::Main, "Core", "SlotA"}, ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER};
+const Info<ExpansionInterface::TEXIDevices> MAIN_SLOT_B{{System::Main, "Core", "SlotB"},
+                                                        ExpansionInterface::EXIDEVICE_NONE};
+const Info<ExpansionInterface::TEXIDevices> MAIN_SERIAL_PORT_1{
+    {System::Main, "Core", "SerialPort1"}, ExpansionInterface::EXIDEVICE_NONE};
+
+const Info<ExpansionInterface::TEXIDevices>& GetInfoForEXIDevice(int channel)
+{
+  static constexpr std::array<const Info<ExpansionInterface::TEXIDevices>*, 3> infos{
+      &MAIN_SLOT_A,
+      &MAIN_SLOT_B,
+      &MAIN_SERIAL_PORT_1,
+  };
+  return *infos[channel];
+}
+
 const Info<std::string> MAIN_BBA_MAC{{System::Main, "Core", "BBA_MAC"}, ""};
 const Info<std::string> MAIN_BBA_XLINK_IP{{System::Main, "Core", "BBA_XLINK_IP"}, "127.0.0.1"};
 const Info<bool> MAIN_BBA_XLINK_CHAT_OSD{{System::Main, "Core", "BBA_XLINK_CHAT_OSD"}, true};
diff --git a/Source/Core/Core/Config/MainSettings.h b/Source/Core/Core/Config/MainSettings.h
index 0e5b0fdbe9..6b7777d48b 100644
--- a/Source/Core/Core/Config/MainSettings.h
+++ b/Source/Core/Core/Config/MainSettings.h
@@ -31,6 +31,11 @@ namespace AudioCommon
 enum class DPL2Quality;
 }
 
+namespace ExpansionInterface
+{
+enum TEXIDevices : int;
+}
+
 namespace Config
 {
 // Main.Core
@@ -59,9 +64,10 @@ extern const Info<std::string> MAIN_AGP_CART_A_PATH;
 extern const Info<std::string> MAIN_AGP_CART_B_PATH;
 extern const Info<std::string> MAIN_GCI_FOLDER_A_PATH_OVERRIDE;
 extern const Info<std::string> MAIN_GCI_FOLDER_B_PATH_OVERRIDE;
-extern const Info<int> MAIN_SLOT_A;
-extern const Info<int> MAIN_SLOT_B;
-extern const Info<int> MAIN_SERIAL_PORT_1;
+extern const Info<ExpansionInterface::TEXIDevices> MAIN_SLOT_A;
+extern const Info<ExpansionInterface::TEXIDevices> MAIN_SLOT_B;
+extern const Info<ExpansionInterface::TEXIDevices> MAIN_SERIAL_PORT_1;
+const Info<ExpansionInterface::TEXIDevices>& GetInfoForEXIDevice(int channel);
 extern const Info<std::string> MAIN_BBA_MAC;
 extern const Info<std::string> MAIN_BBA_XLINK_IP;
 extern const Info<bool> MAIN_BBA_XLINK_CHAT_OSD;
diff --git a/Source/Core/Core/ConfigLoaders/IsSettingSaveable.cpp b/Source/Core/Core/ConfigLoaders/IsSettingSaveable.cpp
index 9859fb977d..0713f550ac 100644
--- a/Source/Core/Core/ConfigLoaders/IsSettingSaveable.cpp
+++ b/Source/Core/Core/ConfigLoaders/IsSettingSaveable.cpp
@@ -110,6 +110,9 @@ bool IsSettingSaveable(const Config::Location& config_location)
       &Config::MAIN_WIIMOTE_CONTINUOUS_SCANNING.GetLocation(),
       &Config::MAIN_WIIMOTE_ENABLE_SPEAKER.GetLocation(),
       &Config::MAIN_CONNECT_WIIMOTES_FOR_CONTROLLER_INTERFACE.GetLocation(),
+      &Config::MAIN_SLOT_A.GetLocation(),
+      &Config::MAIN_SLOT_B.GetLocation(),
+      &Config::MAIN_SERIAL_PORT_1.GetLocation(),
 
       // UI.General
 
diff --git a/Source/Core/Core/ConfigLoaders/NetPlayConfigLoader.cpp b/Source/Core/Core/ConfigLoaders/NetPlayConfigLoader.cpp
index 128eba8ad7..cd6f6d8829 100644
--- a/Source/Core/Core/ConfigLoaders/NetPlayConfigLoader.cpp
+++ b/Source/Core/Core/ConfigLoaders/NetPlayConfigLoader.cpp
@@ -37,9 +37,9 @@ public:
     layer->Set(Config::MAIN_DSP_HLE, m_settings.m_DSPHLE);
     layer->Set(Config::MAIN_OVERCLOCK_ENABLE, m_settings.m_OCEnable);
     layer->Set(Config::MAIN_OVERCLOCK, m_settings.m_OCFactor);
-    layer->Set(Config::MAIN_SLOT_A, static_cast<int>(m_settings.m_EXIDevice[0]));
-    layer->Set(Config::MAIN_SLOT_B, static_cast<int>(m_settings.m_EXIDevice[1]));
-    layer->Set(Config::MAIN_SERIAL_PORT_1, static_cast<int>(m_settings.m_EXIDevice[2]));
+    layer->Set(Config::MAIN_SLOT_A, m_settings.m_EXIDevice[0]);
+    layer->Set(Config::MAIN_SLOT_B, m_settings.m_EXIDevice[1]);
+    layer->Set(Config::MAIN_SERIAL_PORT_1, m_settings.m_EXIDevice[2]);
     layer->Set(Config::SESSION_SAVE_DATA_WRITABLE, m_settings.m_WriteToMemcard);
     layer->Set(Config::MAIN_RAM_OVERRIDE_ENABLE, m_settings.m_RAMOverrideEnable);
     layer->Set(Config::MAIN_MEM1_SIZE, m_settings.m_Mem1Size);
diff --git a/Source/Core/Core/ConfigManager.cpp b/Source/Core/Core/ConfigManager.cpp
index cdd691f259..d222941b65 100644
--- a/Source/Core/Core/ConfigManager.cpp
+++ b/Source/Core/Core/ConfigManager.cpp
@@ -104,9 +104,6 @@ void SConfig::SaveCoreSettings(IniFile& ini)
   core->Set("SyncGpuMaxDistance", iSyncGpuMaxDistance);
   core->Set("SyncGpuMinDistance", iSyncGpuMinDistance);
   core->Set("SyncGpuOverclock", fSyncGpuOverclock);
-  core->Set("SlotA", m_EXIDevice[0]);
-  core->Set("SlotB", m_EXIDevice[1]);
-  core->Set("SerialPort1", m_EXIDevice[2]);
   for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
   {
     core->Set(fmt::format("SIDevice{}", i), m_SIDevice[i]);
@@ -130,9 +127,6 @@ void SConfig::LoadCoreSettings(IniFile& ini)
   IniFile::Section* core = ini.GetOrCreateSection("Core");
 
   core->Get("CPUThread", &bCPUThread, true);
-  core->Get("SlotA", (int*)&m_EXIDevice[0], ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER);
-  core->Get("SlotB", (int*)&m_EXIDevice[1], ExpansionInterface::EXIDEVICE_NONE);
-  core->Get("SerialPort1", (int*)&m_EXIDevice[2], ExpansionInterface::EXIDEVICE_NONE);
   for (size_t i = 0; i < std::size(m_SIDevice); ++i)
   {
     core->Get(fmt::format("SIDevice{}", i), &m_SIDevice[i],
diff --git a/Source/Core/Core/ConfigManager.h b/Source/Core/Core/ConfigManager.h
index 51dfc2b85e..318f5db807 100644
--- a/Source/Core/Core/ConfigManager.h
+++ b/Source/Core/Core/ConfigManager.h
@@ -114,7 +114,6 @@ struct SConfig
   static IniFile LoadLocalGameIni(const std::string& id, std::optional<u16> revision);
   static IniFile LoadGameIni(const std::string& id, std::optional<u16> revision);
 
-  ExpansionInterface::TEXIDevices m_EXIDevice[3];
   SerialInterface::SIDevices m_SIDevice[4];
 
   SConfig(const SConfig&) = delete;
diff --git a/Source/Core/Core/HW/EXI/EXI.cpp b/Source/Core/Core/HW/EXI/EXI.cpp
index c4be51e2ed..d7fc90a25e 100644
--- a/Source/Core/Core/HW/EXI/EXI.cpp
+++ b/Source/Core/Core/HW/EXI/EXI.cpp
@@ -10,6 +10,7 @@
 #include "Common/CommonTypes.h"
 #include "Common/IniFile.h"
 
+#include "Core/Config/MainSettings.h"
 #include "Core/ConfigManager.h"
 #include "Core/CoreTiming.h"
 #include "Core/HW/EXI/EXI_Channel.h"
@@ -45,7 +46,7 @@ void AddMemoryCards(int i)
   {
     if (Movie::IsUsingMemcard(i))
     {
-      if (SConfig::GetInstance().m_EXIDevice[i] == EXIDEVICE_MEMORYCARDFOLDER)
+      if (Config::Get(Config::GetInfoForEXIDevice(i)) == EXIDEVICE_MEMORYCARDFOLDER)
         memorycard_device = EXIDEVICE_MEMORYCARDFOLDER;
       else
         memorycard_device = EXIDEVICE_MEMORYCARD;
@@ -57,7 +58,7 @@ void AddMemoryCards(int i)
   }
   else
   {
-    memorycard_device = SConfig::GetInstance().m_EXIDevice[i];
+    memorycard_device = Config::Get(Config::GetInfoForEXIDevice(i));
   }
 
   g_Channels[i]->AddDevice(memorycard_device, 0);
@@ -101,7 +102,7 @@ void Init()
     AddMemoryCards(i);
 
   g_Channels[0]->AddDevice(EXIDEVICE_MASKROM, 1);
-  g_Channels[0]->AddDevice(SConfig::GetInstance().m_EXIDevice[2], 2);  // Serial Port 1
+  g_Channels[0]->AddDevice(Config::Get(Config::MAIN_SERIAL_PORT_1), 2);
   g_Channels[2]->AddDevice(EXIDEVICE_AD16, 0);
 
   changeDevice = CoreTiming::RegisterEvent("ChangeEXIDevice", ChangeDeviceCallback);
diff --git a/Source/Core/Core/Movie.cpp b/Source/Core/Core/Movie.cpp
index 70d32ffb14..8b4402e2bc 100644
--- a/Source/Core/Core/Movie.cpp
+++ b/Source/Core/Core/Movie.cpp
@@ -1435,14 +1435,12 @@ void SetGraphicsConfig()
 // NOTE: EmuThread / Host Thread
 void GetSettings()
 {
-  const bool slot_a_has_raw_memcard =
-      SConfig::GetInstance().m_EXIDevice[0] == ExpansionInterface::EXIDEVICE_MEMORYCARD;
-  const bool slot_a_has_gci_folder =
-      SConfig::GetInstance().m_EXIDevice[0] == ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER;
-  const bool slot_b_has_raw_memcard =
-      SConfig::GetInstance().m_EXIDevice[1] == ExpansionInterface::EXIDEVICE_MEMORYCARD;
-  const bool slot_b_has_gci_folder =
-      SConfig::GetInstance().m_EXIDevice[1] == ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER;
+  const ExpansionInterface::TEXIDevices slot_a_type = Config::Get(Config::MAIN_SLOT_A);
+  const ExpansionInterface::TEXIDevices slot_b_type = Config::Get(Config::MAIN_SLOT_B);
+  const bool slot_a_has_raw_memcard = slot_a_type == ExpansionInterface::EXIDEVICE_MEMORYCARD;
+  const bool slot_a_has_gci_folder = slot_a_type == ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER;
+  const bool slot_b_has_raw_memcard = slot_b_type == ExpansionInterface::EXIDEVICE_MEMORYCARD;
+  const bool slot_b_has_gci_folder = slot_b_type == ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER;
 
   s_bSaveConfig = true;
   s_bNetPlay = NetPlay::IsNetPlayRunning();
diff --git a/Source/Core/Core/NetPlayServer.cpp b/Source/Core/Core/NetPlayServer.cpp
index ed1527c0c5..34379f29aa 100644
--- a/Source/Core/Core/NetPlayServer.cpp
+++ b/Source/Core/Core/NetPlayServer.cpp
@@ -1307,10 +1307,8 @@ bool NetPlayServer::SetupNetSettings()
   settings.m_CopyWiiSave = Config::Get(Config::NETPLAY_LOAD_WII_SAVE);
   settings.m_OCEnable = Config::Get(Config::MAIN_OVERCLOCK_ENABLE);
   settings.m_OCFactor = Config::Get(Config::MAIN_OVERCLOCK);
-  settings.m_EXIDevice[0] =
-      static_cast<ExpansionInterface::TEXIDevices>(Config::Get(Config::MAIN_SLOT_A));
-  settings.m_EXIDevice[1] =
-      static_cast<ExpansionInterface::TEXIDevices>(Config::Get(Config::MAIN_SLOT_B));
+  settings.m_EXIDevice[0] = Config::Get(Config::MAIN_SLOT_A);
+  settings.m_EXIDevice[1] = Config::Get(Config::MAIN_SLOT_B);
   // There's no way the BBA is going to sync, disable it
   settings.m_EXIDevice[2] = ExpansionInterface::EXIDEVICE_NONE;
 
@@ -1595,11 +1593,12 @@ bool NetPlayServer::SyncSaveData()
 
   u8 save_count = 0;
 
-  constexpr size_t exi_device_count = 2;
-  for (size_t i = 0; i < exi_device_count; i++)
+  constexpr int exi_device_count = 2;
+  for (int i = 0; i < exi_device_count; ++i)
   {
     if (m_settings.m_EXIDevice[i] == ExpansionInterface::EXIDEVICE_MEMORYCARD ||
-        SConfig::GetInstance().m_EXIDevice[i] == ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER)
+        Config::Get(Config::GetInfoForEXIDevice(i)) ==
+            ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER)
     {
       save_count++;
     }
@@ -1654,7 +1653,7 @@ bool NetPlayServer::SyncSaveData()
   const std::string region =
       SConfig::GetDirectoryForRegion(SConfig::ToGameCubeRegion(game->GetRegion()));
 
-  for (size_t i = 0; i < exi_device_count; i++)
+  for (int i = 0; i < exi_device_count; ++i)
   {
     const bool is_slot_a = i == 0;
 
@@ -1695,7 +1694,7 @@ bool NetPlayServer::SyncSaveData()
       SendChunkedToClients(std::move(pac), 1,
                            fmt::format("Memory Card {} Synchronization", is_slot_a ? 'A' : 'B'));
     }
-    else if (SConfig::GetInstance().m_EXIDevice[i] ==
+    else if (Config::Get(Config::GetInfoForEXIDevice(i)) ==
              ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER)
     {
       const std::string path = File::GetUserPath(D_GCUSER_IDX) + region + DIR_SEP +
diff --git a/Source/Core/DolphinQt/GameList/GameList.cpp b/Source/Core/DolphinQt/GameList/GameList.cpp
index 7127553e95..2fd137055f 100644
--- a/Source/Core/DolphinQt/GameList/GameList.cpp
+++ b/Source/Core/DolphinQt/GameList/GameList.cpp
@@ -664,7 +664,9 @@ void GameList::OpenGCSaveFolder()
   for (int i = 0; i < 2; i++)
   {
     QUrl url;
-    switch (SConfig::GetInstance().m_EXIDevice[i])
+    const ExpansionInterface::TEXIDevices current_exi_device =
+        Config::Get(Config::GetInfoForEXIDevice(i));
+    switch (current_exi_device)
     {
     case ExpansionInterface::EXIDEVICE_MEMORYCARDFOLDER:
     {
diff --git a/Source/Core/DolphinQt/Settings/GameCubePane.cpp b/Source/Core/DolphinQt/Settings/GameCubePane.cpp
index 054802e72b..77b3b86b0c 100644
--- a/Source/Core/DolphinQt/Settings/GameCubePane.cpp
+++ b/Source/Core/DolphinQt/Settings/GameCubePane.cpp
@@ -458,8 +458,8 @@ void GameCubePane::LoadSettings()
   for (int i = 0; i < SLOT_COUNT; i++)
   {
     QSignalBlocker blocker(m_slot_combos[i]);
-    m_slot_combos[i]->setCurrentIndex(
-        m_slot_combos[i]->findData(SConfig::GetInstance().m_EXIDevice[i]));
+    const ExpansionInterface::TEXIDevices exi_device = Config::Get(Config::GetInfoForEXIDevice(i));
+    m_slot_combos[i]->setCurrentIndex(m_slot_combos[i]->findData(exi_device));
     UpdateButton(i);
   }
 
@@ -486,8 +486,10 @@ void GameCubePane::SaveSettings()
   for (int i = 0; i < SLOT_COUNT; i++)
   {
     const auto dev = ExpansionInterface::TEXIDevices(m_slot_combos[i]->currentData().toInt());
+    const ExpansionInterface::TEXIDevices current_exi_device =
+        Config::Get(Config::GetInfoForEXIDevice(i));
 
-    if (Core::IsRunning() && SConfig::GetInstance().m_EXIDevice[i] != dev)
+    if (Core::IsRunning() && current_exi_device != dev)
     {
       ExpansionInterface::ChangeDevice(
           // SlotB is on channel 1, slotA and SP1 are on 0
@@ -498,19 +500,7 @@ void GameCubePane::SaveSettings()
           (i == 2) ? 2 : 0);
     }
 
-    SConfig::GetInstance().m_EXIDevice[i] = dev;
-    switch (i)
-    {
-    case SLOT_A_INDEX:
-      Config::SetBaseOrCurrent(Config::MAIN_SLOT_A, dev);
-      break;
-    case SLOT_B_INDEX:
-      Config::SetBaseOrCurrent(Config::MAIN_SLOT_B, dev);
-      break;
-    case SLOT_SP1_INDEX:
-      Config::SetBaseOrCurrent(Config::MAIN_SERIAL_PORT_1, dev);
-      break;
-    }
+    Config::SetBaseOrCurrent(Config::GetInfoForEXIDevice(i), dev);
   }
 
 #ifdef HAS_LIBMGBA