diff --git a/src/backend/cpu/interfaces/ICpuInfo.h b/src/backend/cpu/interfaces/ICpuInfo.h
index f7e9fcfa..a272d3cd 100644
--- a/src/backend/cpu/interfaces/ICpuInfo.h
+++ b/src/backend/cpu/interfaces/ICpuInfo.h
@@ -47,6 +47,7 @@ public:
         MSR_MOD_NONE,
         MSR_MOD_RYZEN,
         MSR_MOD_INTEL,
+        MSR_MOD_BULLDOZER,
         MSR_MOD_CUSTOM,
         MSR_MOD_MAX
     };
diff --git a/src/backend/cpu/platform/AdvancedCpuInfo.cpp b/src/backend/cpu/platform/AdvancedCpuInfo.cpp
index 20496ff1..85bf9207 100644
--- a/src/backend/cpu/platform/AdvancedCpuInfo.cpp
+++ b/src/backend/cpu/platform/AdvancedCpuInfo.cpp
@@ -145,6 +145,9 @@ xmrig::AdvancedCpuInfo::AdvancedCpuInfo() :
             }
             else {
                 m_assembly = Assembly::BULLDOZER;
+                if (family == 21) {
+                    m_msrMod = MSR_MOD_BULLDOZER;
+                }
             }
         }
         else if (m_vendor == VENDOR_INTEL) {
diff --git a/src/backend/cpu/platform/BasicCpuInfo.cpp b/src/backend/cpu/platform/BasicCpuInfo.cpp
index 1dfede21..24f9c012 100644
--- a/src/backend/cpu/platform/BasicCpuInfo.cpp
+++ b/src/backend/cpu/platform/BasicCpuInfo.cpp
@@ -181,6 +181,9 @@ xmrig::BasicCpuInfo::BasicCpuInfo() :
             }
             else {
                 m_assembly = Assembly::BULLDOZER;
+                if (family == 21) {
+                    m_msrMod = MSR_MOD_BULLDOZER;
+                }
             }
         }
         else if (memcmp(vendor, "GenuineIntel", 12) == 0) {
diff --git a/src/crypto/rx/RxConfig.cpp b/src/crypto/rx/RxConfig.cpp
index 2ec568f9..d62189d5 100644
--- a/src/crypto/rx/RxConfig.cpp
+++ b/src/crypto/rx/RxConfig.cpp
@@ -60,16 +60,17 @@ static const std::array<const char *, RxConfig::ModeMax> modeNames = { "auto", "
 
 
 #ifdef XMRIG_FEATURE_MSR
-constexpr size_t kMsrArraySize = 4;
+constexpr size_t kMsrArraySize = 5;
 
 static const std::array<MsrItems, kMsrArraySize> msrPresets = {
     MsrItems(),
     MsrItems{{ 0xC0011020, 0x0 }, { 0xC0011021, 0x40, ~0x20ULL }, { 0xC0011022, 0x510000 }, { 0xC001102b, 0x1808cc16 }},
     MsrItems{{ 0x1a4, 0xf }},
+    MsrItems{{ 0xc0011022, 0x2010, 0x2010 }, { 0xc001102b, 0x70000, 0x770000 }},
     MsrItems()
 };
 
-static const std::array<const char *, kMsrArraySize> modNames = { "none", "ryzen", "intel", "custom" };
+static const std::array<const char *, kMsrArraySize> modNames = { "none", "ryzen", "intel", "bulldozer", "custom" };
 
 static_assert (kMsrArraySize == ICpuInfo::MSR_MOD_MAX, "kMsrArraySize and MSR_MOD_MAX mismatch");
 #endif
diff --git a/src/crypto/rx/Rx_linux.cpp b/src/crypto/rx/Rx_linux.cpp
index c98510bd..ab41693e 100644
--- a/src/crypto/rx/Rx_linux.cpp
+++ b/src/crypto/rx/Rx_linux.cpp
@@ -91,13 +91,19 @@ static MsrItem rdmsr(uint32_t reg)
 }
 
 
+static uint64_t get_masked_value(uint64_t old_value, uint64_t new_value, uint64_t mask)
+{
+    return (new_value & mask) | (old_value & ~mask);
+}
+
+
 static bool wrmsr_on_cpu(uint32_t reg, uint32_t cpu, uint64_t value, uint64_t mask)
 {
     // If a bit in mask is set to 1, use new value, otherwise use old value
     if (mask != MsrItem::kNoMask) {
         uint64_t old_value;
         if (rdmsr_on_cpu(reg, cpu, old_value)) {
-            value = (value & mask) | (old_value & ~mask);
+            value = get_masked_value(old_value, value, mask);
         }
     }
 
@@ -162,7 +168,7 @@ static bool wrmsr(const MsrItems &preset, bool save)
     if (save) {
         for (const auto &i : preset) {
             auto item = rdmsr(i.reg());
-            LOG_VERBOSE(CLEAR "%s" CYAN_BOLD("0x%08" PRIx32) CYAN(":0x%016" PRIx64) CYAN_BOLD(" -> 0x%016" PRIx64), tag, i.reg(), item.value(), i.value());
+            LOG_VERBOSE(CLEAR "%s" CYAN_BOLD("0x%08" PRIx32) CYAN(":0x%016" PRIx64) CYAN_BOLD(" -> 0x%016" PRIx64), tag, i.reg(), item.value(), get_masked_value(item.value(), i.value(), i.mask()));
 
             if (item.isValid()) {
                 savedState.emplace_back(item);
diff --git a/src/crypto/rx/Rx_win.cpp b/src/crypto/rx/Rx_win.cpp
index acfb7f01..cf9613f7 100644
--- a/src/crypto/rx/Rx_win.cpp
+++ b/src/crypto/rx/Rx_win.cpp
@@ -217,6 +217,12 @@ static MsrItem rdmsr(HANDLE driver, uint32_t reg)
 }
 
 
+static uint64_t get_masked_value(uint64_t old_value, uint64_t new_value, uint64_t mask)
+{
+    return (new_value & mask) | (old_value & ~mask);
+}
+
+
 static bool wrmsr(HANDLE driver, uint32_t reg, uint64_t value, uint64_t mask)
 {
     struct {
@@ -230,7 +236,7 @@ static bool wrmsr(HANDLE driver, uint32_t reg, uint64_t value, uint64_t mask)
     if (mask != MsrItem::kNoMask) {
         uint64_t old_value;
         if (rdmsr(driver, reg, old_value)) {
-            value = (value & mask) | (old_value & ~mask);
+            value = get_masked_value(old_value, value, mask);
         }
     }
 
@@ -268,7 +274,7 @@ static bool wrmsr(const MsrItems &preset, bool save)
     if (save) {
         for (const auto &i : preset) {
             auto item = rdmsr(driver, i.reg());
-            LOG_VERBOSE(CLEAR "%s" CYAN_BOLD("0x%08" PRIx32) CYAN(":0x%016" PRIx64) CYAN_BOLD(" -> 0x%016" PRIx64), tag, i.reg(), item.value(), i.value());
+            LOG_VERBOSE(CLEAR "%s" CYAN_BOLD("0x%08" PRIx32) CYAN(":0x%016" PRIx64) CYAN_BOLD(" -> 0x%016" PRIx64), tag, i.reg(), item.value(), get_masked_value(item.value(), i.value(), i.mask()));
 
             if (item.isValid()) {
                 savedState.emplace_back(item);