diff --git a/src/backend/Core.cpp b/src/backend/Core.cpp
index 678b231..134b5c7 100644
--- a/src/backend/Core.cpp
+++ b/src/backend/Core.cpp
@@ -32,13 +32,9 @@ void Core::LoadROM(const std::string &romFilename) {
     const bool isArchive = std::ranges::any_of(archive_types, [&extension](const auto &e) { return e == extension; });
 
     auto rom = Mem::LoadROM(isArchive, romPath);
-    GameDB::match(rom.header);
+
     mem->rom = rom;
-    if (rom.gameNameDB.empty()) {
-        rom.gameNameDB = fs::path(romPath).stem().string();
-        mem->rom.gameNameDB = rom.gameNameDB;
-    }
-    mem->mmio.vi.isPal = Mem::IsROMPAL(rom);
+    mem->mmio.vi.isPal = Mem::IsROMPAL(rom.header);
     mem->mmio.si.pif.InitDevices(mem->rom.saveType);
     mem->mmio.si.pif.mempakPath = romPath;
     mem->mmio.si.pif.LoadEeprom(mem->rom.saveType, romPath);
diff --git a/src/backend/core/Mem.cpp b/src/backend/core/Mem.cpp
index 2d41c9e..e106b97 100644
--- a/src/backend/core/Mem.cpp
+++ b/src/backend/core/Mem.cpp
@@ -109,8 +109,8 @@ ROMHeader Mem::ReadROMHeader(bool isArchive, const std::string &filename) {
     res.clockRate = std::byteswap(res.clockRate);
     res.programCounter = std::byteswap(res.programCounter);
     res.release = std::byteswap(res.release);
-    res.unknown = std::byteswap(res.unknown);
-    res.unknown2 = std::byteswap(res.unknown2);
+    res.checkCode = std::byteswap(res.checkCode);
+    res.reserved = std::byteswap(res.reserved);
 
     return res;
 }
@@ -139,14 +139,21 @@ ROM Mem::LoadROM(const bool isArchive, const std::string &filename) {
     res.header.clockRate = std::byteswap(res.header.clockRate);
     res.header.programCounter = std::byteswap(res.header.programCounter);
     res.header.release = std::byteswap(res.header.release);
-    res.header.unknown = std::byteswap(res.header.unknown);
-    res.header.unknown2 = std::byteswap(res.header.unknown2);
+    res.header.checkCode = std::byteswap(res.header.checkCode);
+    res.header.reserved = std::byteswap(res.header.reserved);
+
+    auto [saveType, _, gameNameDB] = GameDB::match(res.header);
+    res.saveType = saveType;
+    if (gameNameDB.empty()) {
+        gameNameDB = fs::path(filename).stem().string();
+    }
+    res.gameNameDB = gameNameDB;
 
     const u32 checksum = SDL_crc32(0, &res.cart[0x40], 0x9C0);
     SetROMCIC(checksum, res);
     endianness = std::byteswap(ircolib::read_access<u32>(res.cart, 0));
     Util::SwapN64Rom(res.cart, endianness);
-    res.pal = IsROMPAL(res);
+    res.pal = IsROMPAL(res.header);
     return res;
 }
 
diff --git a/src/backend/core/Mem.hpp b/src/backend/core/Mem.hpp
index 71ecd7c..bb486a8 100644
--- a/src/backend/core/Mem.hpp
+++ b/src/backend/core/Mem.hpp
@@ -10,14 +10,15 @@
 
 namespace n64 {
 struct ROMHeader {
-    u8 initialValues[4];
+    u8 unused;
+    u8 initialValues[3];
     u32 clockRate;
     u32 programCounter;
     u32 release;
-    u64 unknown;
-    u64 unknown2;
+    u64 checkCode;
+    u64 reserved;
     char imageName[20];
-    char unknown3[7];
+    u8 reserved2[7];
     u8 categoryCode;
     char uniqueCode[2];
     u8 countryCode;
@@ -133,9 +134,9 @@ struct Mem {
     std::string sramPath{};
     mio::mmap_sink saveData{};
 
-    [[nodiscard]] static FORCE_INLINE bool IsROMPAL(ROM &rom) {
+    [[nodiscard]] static FORCE_INLINE bool IsROMPAL(ROMHeader &header) {
         return std::ranges::any_of(std::array{'D', 'F', 'I', 'P', 'S', 'U', 'X', 'Y', 'Z'},
-                                   [&rom](uint8_t a) { return rom.header.countryCode == a; });
+                                   [&header](uint8_t a) { return header.countryCode == a; });
     }
 };
 } // namespace n64