diff --git a/README.md b/README.md
index 814f927b..6b7ce909 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,7 @@ CPU backend:
       --asm=ASM                 ASM optimizations, possible values: auto, none, intel, ryzen, bulldozer
       --randomx-init=N          threads count to initialize RandomX dataset
       --randomx-no-numa         disable NUMA support for RandomX
+      --randomx-mode=MODE       RandomX mode: auto, fast, light
 
 API:
       --api-worker-id=ID        custom worker-id for API
diff --git a/src/backend/common/interfaces/IRxStorage.h b/src/backend/common/interfaces/IRxStorage.h
index 49273ee3..9e0407b0 100644
--- a/src/backend/common/interfaces/IRxStorage.h
+++ b/src/backend/common/interfaces/IRxStorage.h
@@ -24,6 +24,9 @@
 #define XMRIG_IRXSTORAGE_H
 
 
+#include "crypto/rx/RxConfig.h"
+
+
 #include <cstdint>
 #include <utility>
 
@@ -41,9 +44,9 @@ class IRxStorage
 public:
     virtual ~IRxStorage() = default;
 
-    virtual RxDataset *dataset(const Job &job, uint32_t nodeId) const       = 0;
-    virtual std::pair<uint32_t, uint32_t> hugePages() const                 = 0;
-    virtual void init(const RxSeed &seed, uint32_t threads, bool hugePages) = 0;
+    virtual RxDataset *dataset(const Job &job, uint32_t nodeId) const                               = 0;
+    virtual std::pair<uint32_t, uint32_t> hugePages() const                                         = 0;
+    virtual void init(const RxSeed &seed, uint32_t threads, bool hugePages, RxConfig::Mode mode)    = 0;
 };
 
 
diff --git a/src/base/kernel/interfaces/IConfig.h b/src/base/kernel/interfaces/IConfig.h
index 79a42a27..5044545a 100644
--- a/src/base/kernel/interfaces/IConfig.h
+++ b/src/base/kernel/interfaces/IConfig.h
@@ -89,6 +89,7 @@ public:
         AssemblyKey          = 1015,
         RandomXInitKey       = 1022,
         RandomXNumaKey       = 1023,
+        RandomXModeKey       = 1029,
         CPUMaxThreadsKey     = 1026,
         MemoryPoolKey        = 1027,
 
diff --git a/src/config.json b/src/config.json
index fbc60474..fbbf8225 100644
--- a/src/config.json
+++ b/src/config.json
@@ -16,6 +16,7 @@
     "colors": true,
     "randomx": {
         "init": -1,
+        "mode": "auto",
         "numa": true
     },
     "cpu": {
diff --git a/src/core/config/ConfigTransform.cpp b/src/core/config/ConfigTransform.cpp
index d0264258..667d9117 100644
--- a/src/core/config/ConfigTransform.cpp
+++ b/src/core/config/ConfigTransform.cpp
@@ -160,6 +160,9 @@ void xmrig::ConfigTransform::transform(rapidjson::Document &doc, int key, const
 
     case IConfig::RandomXNumaKey: /* --randomx-no-numa */
         return set(doc, kRandomX, "numa", false);
+
+    case IConfig::RandomXModeKey: /* --randomx-mode */
+        return set(doc, kRandomX, "mode", arg);
 #   endif
 
 #   ifdef XMRIG_FEATURE_OPENCL
diff --git a/src/core/config/Config_platform.h b/src/core/config/Config_platform.h
index 80fcf87f..608ac48e 100644
--- a/src/core/config/Config_platform.h
+++ b/src/core/config/Config_platform.h
@@ -96,6 +96,7 @@ static const option options[] = {
 #   ifdef XMRIG_ALGO_RANDOMX
     { "randomx-init",          1, nullptr, IConfig::RandomXInitKey        },
     { "randomx-no-numa",       0, nullptr, IConfig::RandomXNumaKey        },
+    { "randomx-mode",          1, nullptr, IConfig::RandomXModeKey        },
 #   endif
 #   ifdef XMRIG_FEATURE_OPENCL
     { "opencl",                0, nullptr, IConfig::OclKey                },
diff --git a/src/core/config/usage.h b/src/core/config/usage.h
index 48b34b81..dcae30f4 100644
--- a/src/core/config/usage.h
+++ b/src/core/config/usage.h
@@ -86,6 +86,7 @@ static inline const std::string &usage()
 #   ifdef XMRIG_ALGO_RANDOMX
     u += "      --randomx-init=N          threads count to initialize RandomX dataset\n";
     u += "      --randomx-no-numa         disable NUMA support for RandomX\n";
+    u += "      --randomx-mode=MODE       RandomX mode: auto, fast, light\n";
 #   endif
 
 #   ifdef XMRIG_FEATURE_HTTP
diff --git a/src/crypto/rx/Rx.cpp b/src/crypto/rx/Rx.cpp
index 115c0f62..b08f844e 100644
--- a/src/crypto/rx/Rx.cpp
+++ b/src/crypto/rx/Rx.cpp
@@ -70,7 +70,7 @@ bool xmrig::Rx::init(const Job &job, const RxConfig &config, bool hugePages)
         return true;
     }
 
-    d_ptr->queue.enqueue(job, config.nodeset(), config.threads(), hugePages);
+    d_ptr->queue.enqueue(job, config.nodeset(), config.threads(), hugePages, config.mode());
 
     return false;
 }
diff --git a/src/crypto/rx/RxBasicStorage.cpp b/src/crypto/rx/RxBasicStorage.cpp
index dcabad5b..bc1ceb2d 100644
--- a/src/crypto/rx/RxBasicStorage.cpp
+++ b/src/crypto/rx/RxBasicStorage.cpp
@@ -69,11 +69,11 @@ public:
     }
 
 
-    inline void createDataset(bool hugePages)
+    inline void createDataset(bool hugePages, RxConfig::Mode mode)
     {
         const uint64_t ts = Chrono::steadyMSecs();
 
-        m_dataset = new RxDataset(hugePages, true);
+        m_dataset = new RxDataset(hugePages, true, mode);
         printAllocStatus(ts);
     }
 
@@ -150,19 +150,19 @@ xmrig::RxDataset *xmrig::RxBasicStorage::dataset(const Job &job, uint32_t) const
 std::pair<uint32_t, uint32_t> xmrig::RxBasicStorage::hugePages() const
 {
     if (!d_ptr->dataset()) {
-        return { 0u, 0u };
+        return { 0U, 0U };
     }
 
     return d_ptr->dataset()->hugePages();
 }
 
 
-void xmrig::RxBasicStorage::init(const RxSeed &seed, uint32_t threads, bool hugePages)
+void xmrig::RxBasicStorage::init(const RxSeed &seed, uint32_t threads, bool hugePages, RxConfig::Mode mode)
 {
     d_ptr->setSeed(seed);
 
     if (!d_ptr->dataset()) {
-        d_ptr->createDataset(hugePages);
+        d_ptr->createDataset(hugePages, mode);
     }
 
     d_ptr->initDataset(threads);
diff --git a/src/crypto/rx/RxBasicStorage.h b/src/crypto/rx/RxBasicStorage.h
index 63eba1d9..bd6575d2 100644
--- a/src/crypto/rx/RxBasicStorage.h
+++ b/src/crypto/rx/RxBasicStorage.h
@@ -50,7 +50,7 @@ public:
 protected:
     RxDataset *dataset(const Job &job, uint32_t nodeId) const override;
     std::pair<uint32_t, uint32_t> hugePages() const override;
-    void init(const RxSeed &seed, uint32_t threads, bool hugePages) override;
+    void init(const RxSeed &seed, uint32_t threads, bool hugePages, RxConfig::Mode mode) override;
 
 private:
     RxBasicStoragePrivate *d_ptr;
diff --git a/src/crypto/rx/RxConfig.cpp b/src/crypto/rx/RxConfig.cpp
index 07f45eac..2318bfbe 100644
--- a/src/crypto/rx/RxConfig.cpp
+++ b/src/crypto/rx/RxConfig.cpp
@@ -25,9 +25,54 @@
 
 #include "crypto/rx/RxConfig.h"
 #include "backend/cpu/Cpu.h"
+#include "rapidjson/document.h"
+
+
+#include <array>
+#include <algorithm>
+
+
+#ifdef _MSC_VER
+#   define strcasecmp  _stricmp
+#endif
+
+
+namespace xmrig {
+
+
+static const std::array<const char *, RxConfig::ModeMax> modeNames = { "auto", "fast", "light" };
+
+
+} // namespace xmrig
+
+
+const char *xmrig::RxConfig::modeName() const
+{
+    return modeNames[m_mode];
+}
 
 
 uint32_t xmrig::RxConfig::threads() const
 {
     return m_threads < 1 ? static_cast<uint32_t>(Cpu::info()->threads()) : static_cast<uint32_t>(m_threads);
 }
+
+
+xmrig::RxConfig::Mode xmrig::RxConfig::readMode(const rapidjson::Value &value) const
+{
+    if (value.IsUint()) {
+        return static_cast<Mode>(std::min(value.GetUint(), ModeMax - 1));
+    }
+
+    if (value.IsString()) {
+        auto mode = value.GetString();
+
+        for (size_t i = 0; i < modeNames.size(); i++) {
+            if (strcasecmp(mode, modeNames[i]) == 0) {
+                return static_cast<Mode>(i);
+            }
+        }
+    }
+
+    return LightMode;
+}
diff --git a/src/crypto/rx/RxConfig.h b/src/crypto/rx/RxConfig.h
index 52a832a2..13ebb9d1 100644
--- a/src/crypto/rx/RxConfig.h
+++ b/src/crypto/rx/RxConfig.h
@@ -38,6 +38,13 @@ namespace xmrig {
 class RxConfig
 {
 public:
+    enum Mode : uint32_t {
+        AutoMode,
+        FastMode,
+        LightMode,
+        ModeMax
+    };
+
     bool read(const rapidjson::Value &value);
     rapidjson::Value toJSON(rapidjson::Document &doc) const;
 
@@ -47,11 +54,17 @@ public:
     inline std::vector<uint32_t> nodeset() const { return std::vector<uint32_t>(); }
 #   endif
 
+    const char *modeName() const;
     uint32_t threads() const;
 
+    inline Mode mode() const    { return m_mode; }
+
 private:
+    Mode readMode(const rapidjson::Value &value) const;
+
     bool m_numa     = true;
     int m_threads   = -1;
+    Mode m_mode     = AutoMode;
 
 #   ifdef XMRIG_FEATURE_HWLOC
     std::vector<uint32_t> m_nodeset;
diff --git a/src/crypto/rx/RxConfig_basic.cpp b/src/crypto/rx/RxConfig_basic.cpp
index 26ef7a90..1311b220 100644
--- a/src/crypto/rx/RxConfig_basic.cpp
+++ b/src/crypto/rx/RxConfig_basic.cpp
@@ -31,6 +31,7 @@
 namespace xmrig {
 
 static const char *kInit = "init";
+static const char *kMode = "mode";
 
 }
 
@@ -42,6 +43,7 @@ rapidjson::Value xmrig::RxConfig::toJSON(rapidjson::Document &doc) const
 
     Value obj(kObjectType);
     obj.AddMember(StringRef(kInit), m_threads, allocator);
+    obj.AddMember(StringRef(kMode), StringRef(modeName()), allocator);
 
     return obj;
 }
@@ -51,6 +53,7 @@ bool xmrig::RxConfig::read(const rapidjson::Value &value)
 {
     if (value.IsObject()) {
         m_threads = Json::getInt(value, kInit, m_threads);
+        m_mode    = readMode(Json::getValue(value, kMode));
 
         return true;
     }
diff --git a/src/crypto/rx/RxConfig_hwloc.cpp b/src/crypto/rx/RxConfig_hwloc.cpp
index 66f086f2..4fc57fb6 100644
--- a/src/crypto/rx/RxConfig_hwloc.cpp
+++ b/src/crypto/rx/RxConfig_hwloc.cpp
@@ -33,6 +33,7 @@
 namespace xmrig {
 
 static const char *kInit = "init";
+static const char *kMode = "mode";
 static const char *kNUMA = "numa";
 
 }
@@ -46,6 +47,7 @@ rapidjson::Value xmrig::RxConfig::toJSON(rapidjson::Document &doc) const
     Value obj(kObjectType);
 
     obj.AddMember(StringRef(kInit), m_threads, allocator);
+    obj.AddMember(StringRef(kMode), StringRef(modeName()), allocator);
 
     if (!m_nodeset.empty()) {
         Value numa(kArrayType);
@@ -68,6 +70,13 @@ bool xmrig::RxConfig::read(const rapidjson::Value &value)
 {
     if (value.IsObject()) {
         m_threads = Json::getInt(value, kInit, m_threads);
+        m_mode    = readMode(Json::getValue(value, kMode));
+
+        if (m_mode == LightMode) {
+            m_numa = false;
+
+            return true;
+        }
 
         const auto &numa = Json::getValue(value, kNUMA);
         if (numa.IsArray()) {
diff --git a/src/crypto/rx/RxDataset.cpp b/src/crypto/rx/RxDataset.cpp
index 62887a01..ce41a58e 100644
--- a/src/crypto/rx/RxDataset.cpp
+++ b/src/crypto/rx/RxDataset.cpp
@@ -26,6 +26,8 @@
 
 
 #include "crypto/rx/RxDataset.h"
+#include "backend/common/Tags.h"
+#include "base/io/log/Log.h"
 #include "crypto/common/VirtualMemory.h"
 #include "crypto/randomx/randomx.h"
 #include "crypto/rx/RxAlgo.h"
@@ -33,12 +35,14 @@
 
 
 #include <thread>
+#include <uv.h>
 
 
 static_assert(RANDOMX_FLAG_LARGE_PAGES == 1, "RANDOMX_FLAG_LARGE_PAGES flag mismatch");
 
 
-xmrig::RxDataset::RxDataset(bool hugePages, bool cache)
+xmrig::RxDataset::RxDataset(bool hugePages, bool cache, RxConfig::Mode mode) :
+    m_mode(mode)
 {
     allocate(hugePages);
 
@@ -118,7 +122,7 @@ size_t xmrig::RxDataset::size(bool cache) const
 
 std::pair<uint32_t, uint32_t> xmrig::RxDataset::hugePages(bool cache) const
 {
-    constexpr size_t twoMiB     = 2u * 1024u * 1024u;
+    constexpr size_t twoMiB     = 2U * 1024U * 1024U;
     constexpr size_t cacheSize  = VirtualMemory::align(RxCache::maxSize(), twoMiB) / twoMiB;
     size_t total                = VirtualMemory::align(maxSize(), twoMiB) / twoMiB;
 
@@ -157,6 +161,18 @@ void xmrig::RxDataset::setRaw(const void *raw)
 
 void xmrig::RxDataset::allocate(bool hugePages)
 {
+    if (m_mode == RxConfig::LightMode) {
+        LOG_ERR(CLEAR "%s" RED_BOLD_S "fast RandomX mode disabled by config", rx_tag());
+
+        return;
+    }
+
+    if (m_mode == RxConfig::AutoMode && uv_get_total_memory() < (maxSize() + RxCache::maxSize())) {
+        LOG_ERR(CLEAR "%s" RED_BOLD_S "not enough memory for RandomX dataset", rx_tag());
+
+        return;
+    }
+
     if (hugePages) {
         m_flags   = RANDOMX_FLAG_LARGE_PAGES;
         m_dataset = randomx_alloc_dataset(static_cast<randomx_flags>(m_flags));
diff --git a/src/crypto/rx/RxDataset.h b/src/crypto/rx/RxDataset.h
index 9b4f4120..30455956 100644
--- a/src/crypto/rx/RxDataset.h
+++ b/src/crypto/rx/RxDataset.h
@@ -28,9 +28,10 @@
 #define XMRIG_RX_DATASET_H
 
 
+#include "base/tools/Object.h"
 #include "crypto/common/Algorithm.h"
 #include "crypto/randomx/configuration.h"
-#include "base/tools/Object.h"
+#include "crypto/rx/RxConfig.h"
 
 
 struct randomx_dataset;
@@ -49,7 +50,7 @@ class RxDataset
 public:
     XMRIG_DISABLE_COPY_MOVE_DEFAULT(RxDataset)
 
-    RxDataset(bool hugePages, bool cache);
+    RxDataset(bool hugePages, bool cache, RxConfig::Mode mode);
     RxDataset(RxCache *cache);
     ~RxDataset();
 
@@ -69,9 +70,10 @@ public:
 private:
     void allocate(bool hugePages);
 
-    int m_flags                = 0;
-    randomx_dataset *m_dataset = nullptr;
-    RxCache *m_cache           = nullptr;
+    const RxConfig::Mode m_mode = RxConfig::FastMode;
+    int m_flags                 = 0;
+    randomx_dataset *m_dataset  = nullptr;
+    RxCache *m_cache            = nullptr;
 };
 
 
diff --git a/src/crypto/rx/RxNUMAStorage.cpp b/src/crypto/rx/RxNUMAStorage.cpp
index 6d8ec167..646d3d95 100644
--- a/src/crypto/rx/RxNUMAStorage.cpp
+++ b/src/crypto/rx/RxNUMAStorage.cpp
@@ -198,7 +198,7 @@ private:
             return;
         }
 
-        auto dataset = new RxDataset(hugePages, false);
+        auto dataset = new RxDataset(hugePages, false, RxConfig::FastMode);
         if (!dataset->get()) {
             printSkipped(nodeId, "failed to allocate dataset");
 
@@ -339,14 +339,14 @@ xmrig::RxDataset *xmrig::RxNUMAStorage::dataset(const Job &job, uint32_t nodeId)
 std::pair<uint32_t, uint32_t> xmrig::RxNUMAStorage::hugePages() const
 {
     if (!d_ptr->isAllocated()) {
-        return { 0u, 0u };
+        return { 0U, 0U };
     }
 
     return d_ptr->hugePages();
 }
 
 
-void xmrig::RxNUMAStorage::init(const RxSeed &seed, uint32_t threads, bool hugePages)
+void xmrig::RxNUMAStorage::init(const RxSeed &seed, uint32_t threads, bool hugePages, RxConfig::Mode)
 {
     d_ptr->setSeed(seed);
 
diff --git a/src/crypto/rx/RxNUMAStorage.h b/src/crypto/rx/RxNUMAStorage.h
index 3afdd81d..bed0bc75 100644
--- a/src/crypto/rx/RxNUMAStorage.h
+++ b/src/crypto/rx/RxNUMAStorage.h
@@ -53,7 +53,7 @@ public:
 protected:
     RxDataset *dataset(const Job &job, uint32_t nodeId) const override;
     std::pair<uint32_t, uint32_t> hugePages() const override;
-    void init(const RxSeed &seed, uint32_t threads, bool hugePages) override;
+    void init(const RxSeed &seed, uint32_t threads, bool hugePages, RxConfig::Mode mode) override;
 
 private:
     RxNUMAStoragePrivate *d_ptr;
diff --git a/src/crypto/rx/RxQueue.cpp b/src/crypto/rx/RxQueue.cpp
index 6614d407..b420d0c2 100644
--- a/src/crypto/rx/RxQueue.cpp
+++ b/src/crypto/rx/RxQueue.cpp
@@ -90,11 +90,11 @@ std::pair<uint32_t, uint32_t> xmrig::RxQueue::hugePages()
 {
     std::lock_guard<std::mutex> lock(m_mutex);
 
-    return m_storage && m_state == STATE_IDLE ? m_storage->hugePages() : std::pair<uint32_t, uint32_t>(0u, 0u);
+    return m_storage && m_state == STATE_IDLE ? m_storage->hugePages() : std::pair<uint32_t, uint32_t>(0U, 0U);
 }
 
 
-void xmrig::RxQueue::enqueue(const RxSeed &seed, const std::vector<uint32_t> &nodeset, uint32_t threads, bool hugePages)
+void xmrig::RxQueue::enqueue(const RxSeed &seed, const std::vector<uint32_t> &nodeset, uint32_t threads, bool hugePages, RxConfig::Mode mode)
 {
     std::unique_lock<std::mutex> lock(m_mutex);
 
@@ -114,7 +114,7 @@ void xmrig::RxQueue::enqueue(const RxSeed &seed, const std::vector<uint32_t> &no
         return;
     }
 
-    m_queue.emplace_back(seed, nodeset, threads, hugePages);
+    m_queue.emplace_back(seed, nodeset, threads, hugePages, mode);
     m_seed  = seed;
     m_state = STATE_PENDING;
 
@@ -156,7 +156,7 @@ void xmrig::RxQueue::backgroundInit()
                  Buffer::toHex(item.seed.data().data(), 8).data()
                  );
 
-        m_storage->init(item.seed, item.threads, item.hugePages);
+        m_storage->init(item.seed, item.threads, item.hugePages, item.mode);
 
         lock = std::unique_lock<std::mutex>(m_mutex);
 
diff --git a/src/crypto/rx/RxQueue.h b/src/crypto/rx/RxQueue.h
index 28407a87..2d77e2e3 100644
--- a/src/crypto/rx/RxQueue.h
+++ b/src/crypto/rx/RxQueue.h
@@ -29,6 +29,7 @@
 
 
 #include "base/tools/Object.h"
+#include "crypto/rx/RxConfig.h"
 #include "crypto/rx/RxSeed.h"
 
 
@@ -52,14 +53,16 @@ class RxDataset;
 class RxQueueItem
 {
 public:
-    RxQueueItem(const RxSeed &seed, const std::vector<uint32_t> &nodeset, uint32_t threads, bool hugePages) :
+    RxQueueItem(const RxSeed &seed, const std::vector<uint32_t> &nodeset, uint32_t threads, bool hugePages, RxConfig::Mode mode) :
         hugePages(hugePages),
+        mode(mode),
         seed(seed),
         nodeset(nodeset),
         threads(threads)
     {}
 
     const bool hugePages;
+    const RxConfig::Mode mode;
     const RxSeed seed;
     const std::vector<uint32_t> nodeset;
     const uint32_t threads;
@@ -77,7 +80,7 @@ public:
     bool isReady(const Job &job);
     RxDataset *dataset(const Job &job, uint32_t nodeId);
     std::pair<uint32_t, uint32_t> hugePages();
-    void enqueue(const RxSeed &seed, const std::vector<uint32_t> &nodeset, uint32_t threads, bool hugePages);
+    void enqueue(const RxSeed &seed, const std::vector<uint32_t> &nodeset, uint32_t threads, bool hugePages, RxConfig::Mode mode);
 
 private:
     enum State {