diff --git a/src/backend/cuda/CudaBackend.cpp b/src/backend/cuda/CudaBackend.cpp
index 784d21eb1..853d37e9f 100644
--- a/src/backend/cuda/CudaBackend.cpp
+++ b/src/backend/cuda/CudaBackend.cpp
@@ -32,6 +32,9 @@
 #include "backend/common/interfaces/IWorker.h"
 #include "backend/common/Tags.h"
 #include "backend/common/Workers.h"
+#include "backend/cuda/CudaConfig.h"
+#include "backend/cuda/CudaThreads.h"
+#include "backend/cuda/wrappers/CudaLib.h"
 #include "base/io/log/Log.h"
 #include "base/net/stratum/Job.h"
 #include "base/tools/Chrono.h"
@@ -49,7 +52,7 @@
 namespace xmrig {
 
 
-extern template class Threads<OclThreads>;
+extern template class Threads<CudaThreads>;
 
 
 constexpr const size_t oneMiB   = 1024u * 1024u;
@@ -59,17 +62,42 @@ static std::mutex mutex;
 
 
 
+static void printDisabled(const char *reason)
+{
+    Log::print(GREEN_BOLD(" * ") WHITE_BOLD("%-13s") RED_BOLD("disabled") "%s", "CUDA", reason);
+}
+
+
+
 class CudaBackendPrivate
 {
 public:
     inline CudaBackendPrivate(Controller *controller) :
         controller(controller)
     {
+        init(controller->config()->cuda());
     }
 
 
-    void init(const OclConfig &cl)
+    void init(const CudaConfig &cuda)
     {
+        if (!cuda.isEnabled()) {
+            return printDisabled("");
+        }
+
+        if (!CudaLib::init(cuda.loader())) {
+            return printDisabled(RED_S " (failed to load CUDA plugin)");
+        }
+
+        if (!CudaLib::runtimeVersion() || !CudaLib::driverVersion() || !CudaLib::deviceCount()) {
+            return printDisabled(RED_S " (no devices)");
+        }
+
+        const uint32_t runtimeVersion = CudaLib::runtimeVersion();
+        const uint32_t driverVersion  = CudaLib::driverVersion();
+
+        Log::print(GREEN_BOLD(" * ") WHITE_BOLD("%-13s") WHITE_BOLD("%u.%u") "/" WHITE_BOLD("%u.%u") BLACK_BOLD("/%s"), "CUDA",
+                   runtimeVersion / 1000, runtimeVersion % 100, driverVersion / 1000, driverVersion % 100, CudaLib::pluginVersion());
     }
 
 
@@ -102,6 +130,8 @@ xmrig::CudaBackend::CudaBackend(Controller *controller) :
 xmrig::CudaBackend::~CudaBackend()
 {
     delete d_ptr;
+
+    CudaLib::close();
 }
 
 
diff --git a/src/backend/cuda/CudaConfig.cpp b/src/backend/cuda/CudaConfig.cpp
index 792131de9..ee4008222 100644
--- a/src/backend/cuda/CudaConfig.cpp
+++ b/src/backend/cuda/CudaConfig.cpp
@@ -35,6 +35,7 @@ namespace xmrig {
 
 static const char *kDevicesHint = "devices-hint";
 static const char *kEnabled     = "enabled";
+static const char *kLoader      = "loader";
 
 
 extern template class Threads<CudaThreads>;
@@ -51,6 +52,7 @@ rapidjson::Value xmrig::CudaConfig::toJSON(rapidjson::Document &doc) const
     Value obj(kObjectType);
 
     obj.AddMember(StringRef(kEnabled),  m_enabled, allocator);
+    obj.AddMember(StringRef(kLoader),   m_loader.toJSON(), allocator);
 
     m_threads.toJSON(obj, doc);
 
@@ -62,6 +64,7 @@ void xmrig::CudaConfig::read(const rapidjson::Value &value)
 {
     if (value.IsObject()) {
         m_enabled   = Json::getBool(value, kEnabled, m_enabled);
+        m_loader    = Json::getString(value, kLoader);
 
         setDevicesHint(Json::getString(value, kDevicesHint));
 
diff --git a/src/backend/cuda/CudaConfig.h b/src/backend/cuda/CudaConfig.h
index 6feaa1304..16c06e60a 100644
--- a/src/backend/cuda/CudaConfig.h
+++ b/src/backend/cuda/CudaConfig.h
@@ -43,6 +43,7 @@ public:
 
     inline bool isEnabled() const                       { return m_enabled; }
     inline bool isShouldSave() const                    { return m_shouldSave; }
+    inline const String &loader() const                 { return m_loader; }
     inline const Threads<CudaThreads> &threads() const  { return m_threads; }
 
 private:
@@ -52,6 +53,7 @@ private:
     bool m_enabled       = false;
     bool m_shouldSave    = false;
     std::vector<uint32_t> m_devicesHint;
+    String m_loader;
     Threads<CudaThreads> m_threads;
 };
 
diff --git a/src/backend/cuda/cuda.cmake b/src/backend/cuda/cuda.cmake
index f8840c380..983e18a98 100644
--- a/src/backend/cuda/cuda.cmake
+++ b/src/backend/cuda/cuda.cmake
@@ -3,10 +3,11 @@ if (WITH_CUDA)
 
     set(HEADERS_BACKEND_CUDA
         src/backend/cuda/CudaBackend.h
-        src/backend/cuda/CudaConfig.h
         src/backend/cuda/CudaConfig_gen.h
+        src/backend/cuda/CudaConfig.h
         src/backend/cuda/CudaThread.h
         src/backend/cuda/CudaThreads.h
+        src/backend/cuda/wrappers/CudaLib.h
        )
 
     set(SOURCES_BACKEND_CUDA
@@ -14,6 +15,7 @@ if (WITH_CUDA)
         src/backend/cuda/CudaConfig.cpp
         src/backend/cuda/CudaThread.cpp
         src/backend/cuda/CudaThreads.cpp
+        src/backend/cuda/wrappers/CudaLib.cpp
        )
 else()
     remove_definitions(/DXMRIG_FEATURE_CUDA)
diff --git a/src/backend/cuda/wrappers/CudaLib.cpp b/src/backend/cuda/wrappers/CudaLib.cpp
new file mode 100644
index 000000000..1d0754087
--- /dev/null
+++ b/src/backend/cuda/wrappers/CudaLib.cpp
@@ -0,0 +1,174 @@
+/* XMRig
+ * Copyright 2010      Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2012-2014 pooler      <pooler@litecoinpool.org>
+ * Copyright 2014      Lucas Jones <https://github.com/lucasjones>
+ * Copyright 2014-2016 Wolf9466    <https://github.com/OhGodAPet>
+ * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
+ * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
+ * Copyright 2018-2019 SChernykh   <https://github.com/SChernykh>
+ * Copyright 2016-2019 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <stdexcept>
+#include <uv.h>
+
+
+#include "backend/cuda/wrappers/CudaLib.h"
+#include "base/io/log/Log.h"
+
+
+namespace xmrig {
+
+
+enum Version : uint32_t
+{
+    ApiVersion,
+    DriverVersion,
+    RuntimeVersion
+};
+
+
+static uv_lib_t cudaLib;
+
+
+static const char *kAlloc                               = "alloc";
+static const char *kDeviceCount                         = "deviceCount";
+static const char *kPluginVersion                       = "pluginVersion";
+static const char *kRelease                             = "release";
+static const char *kSymbolNotFound                      = "symbol not found";
+static const char *kVersion                             = "version";
+
+
+using alloc_t                                           = nvid_ctx * (*)(size_t, int, int, int, int, int);
+using deviceCount_t                                     = size_t (*)();
+using pluginVersion_t                                   = const char * (*)();
+using release_t                                         = void (*)(nvid_ctx *);
+using version_t                                         = uint32_t (*)(Version);
+
+
+static alloc_t pAlloc                                   = nullptr;
+static deviceCount_t pDeviceCount                       = nullptr;
+static pluginVersion_t pPluginVersion                   = nullptr;
+static release_t pRelease                               = nullptr;
+static version_t pVersion                               = nullptr;
+
+
+#define DLSYM(x) if (uv_dlsym(&cudaLib, k##x, reinterpret_cast<void**>(&p##x)) == -1) { throw std::runtime_error(kSymbolNotFound); }
+
+
+bool CudaLib::m_initialized = false;
+bool CudaLib::m_ready       = false;
+String CudaLib::m_loader;
+
+
+} // namespace xmrig
+
+
+bool xmrig::CudaLib::init(const char *fileName)
+{
+    if (!m_initialized) {
+        m_loader      = fileName == nullptr ? defaultLoader() : fileName;
+        m_ready       = uv_dlopen(m_loader, &cudaLib) == 0 && load();
+        m_initialized = true;
+    }
+
+    return m_ready;
+}
+
+
+const char *xmrig::CudaLib::lastError()
+{
+    return uv_dlerror(&cudaLib);
+}
+
+
+void xmrig::CudaLib::close()
+{
+    uv_dlclose(&cudaLib);
+}
+
+
+const char *xmrig::CudaLib::pluginVersion() noexcept
+{
+    return pPluginVersion();
+}
+
+
+nvid_ctx *xmrig::CudaLib::alloc(size_t id, int blocks, int threads, int bfactor, int bsleep, const Algorithm &algorithm) noexcept
+{
+    return pAlloc(id, blocks, threads, bfactor, bsleep, algorithm);
+}
+
+
+size_t xmrig::CudaLib::deviceCount() noexcept
+{
+    return pDeviceCount();
+}
+
+
+uint32_t xmrig::CudaLib::driverVersion() noexcept
+{
+    return pVersion(DriverVersion);
+}
+
+
+uint32_t xmrig::CudaLib::runtimeVersion() noexcept
+{
+    return pVersion(RuntimeVersion);
+}
+
+
+void xmrig::CudaLib::release(nvid_ctx *ctx) noexcept
+{
+    pRelease(ctx);
+}
+
+
+bool xmrig::CudaLib::load()
+{
+    if (uv_dlsym(&cudaLib, kVersion, reinterpret_cast<void**>(&pVersion)) == -1) {
+        return false;
+    }
+
+    if (pVersion(ApiVersion) != 1u) {
+        return false;
+    }
+
+    try {
+        DLSYM(Alloc);
+        DLSYM(DeviceCount);
+        DLSYM(PluginVersion);
+        DLSYM(Release);
+        DLSYM(Version);
+    } catch (std::exception &ex) {
+        return false;
+    }
+
+    return true;
+}
+
+
+const char *xmrig::CudaLib::defaultLoader()
+{
+#   if defined(__APPLE__)
+    return "/System/Library/Frameworks/OpenCL.framework/OpenCL"; // FIXME
+#   elif defined(_WIN32)
+    return "xmrig-cuda.dll";
+#   else
+    return "xmrig-cuda.so";
+#   endif
+}
diff --git a/src/backend/cuda/wrappers/CudaLib.h b/src/backend/cuda/wrappers/CudaLib.h
new file mode 100644
index 000000000..d82447e15
--- /dev/null
+++ b/src/backend/cuda/wrappers/CudaLib.h
@@ -0,0 +1,72 @@
+/* XMRig
+ * Copyright 2010      Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2012-2014 pooler      <pooler@litecoinpool.org>
+ * Copyright 2014      Lucas Jones <https://github.com/lucasjones>
+ * Copyright 2014-2016 Wolf9466    <https://github.com/OhGodAPet>
+ * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
+ * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
+ * Copyright 2018-2019 SChernykh   <https://github.com/SChernykh>
+ * Copyright 2016-2019 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef XMRIG_CUDALIB_H
+#define XMRIG_CUDALIB_H
+
+
+#include <vector>
+
+
+#include "base/tools/String.h"
+#include "crypto/common/Algorithm.h"
+
+
+using nvid_ctx = struct nvid_ctx;
+
+
+namespace xmrig {
+
+
+class CudaLib
+{
+public:
+    static bool init(const char *fileName = nullptr);
+    static const char *lastError();
+    static void close();
+
+    static inline bool isInitialized()   { return m_initialized; }
+    static inline const String &loader() { return m_loader; }
+
+    static const char *pluginVersion() noexcept;
+    static nvid_ctx *alloc(size_t id, int blocks, int threads, int bfactor, int bsleep, const Algorithm &algorithm) noexcept;
+    static size_t deviceCount() noexcept;
+    static uint32_t driverVersion() noexcept;
+    static uint32_t runtimeVersion() noexcept;
+    static void release(nvid_ctx *ctx) noexcept;
+
+private:
+    static bool load();
+    static const char *defaultLoader();
+
+    static bool m_initialized;
+    static bool m_ready;
+    static String m_loader;
+};
+
+
+} // namespace xmrig
+
+
+#endif /* XMRIG_CUDALIB_H */
diff --git a/src/backend/opencl/wrappers/OclLib.cpp b/src/backend/opencl/wrappers/OclLib.cpp
index 1b530bae9..f156ed3d8 100644
--- a/src/backend/opencl/wrappers/OclLib.cpp
+++ b/src/backend/opencl/wrappers/OclLib.cpp
@@ -77,6 +77,7 @@ static const char *kRetainMemObject                  = "clRetainMemObject";
 static const char *kRetainProgram                    = "clRetainProgram";
 static const char *kSetKernelArg                     = "clSetKernelArg";
 static const char *kSetMemObjectDestructorCallback   = "clSetMemObjectDestructorCallback";
+static const char *kSymbolNotFound                   = "symbol not found";
 static const char *kUnloadPlatformCompiler           = "clUnloadPlatformCompiler";
 
 
@@ -156,7 +157,7 @@ static setKernelArg_t pSetKernelArg                                         = nu
 static setMemObjectDestructorCallback_t pSetMemObjectDestructorCallback     = nullptr;
 static unloadPlatformCompiler_t pUnloadPlatformCompiler                     = nullptr;
 
-#define DLSYM(x) if (uv_dlsym(&oclLib, k##x, reinterpret_cast<void**>(&p##x)) == -1) { return false; }
+#define DLSYM(x) if (uv_dlsym(&oclLib, k##x, reinterpret_cast<void**>(&p##x)) == -1) { throw std::runtime_error(kSymbolNotFound); }
 
 
 namespace xmrig {
@@ -210,39 +211,43 @@ void xmrig::OclLib::close()
 
 bool xmrig::OclLib::load()
 {
-    DLSYM(CreateCommandQueue);
-    DLSYM(CreateContext);
-    DLSYM(BuildProgram);
-    DLSYM(EnqueueNDRangeKernel);
-    DLSYM(EnqueueReadBuffer);
-    DLSYM(EnqueueWriteBuffer);
-    DLSYM(Finish);
-    DLSYM(GetDeviceIDs);
-    DLSYM(GetDeviceInfo);
-    DLSYM(GetPlatformInfo);
-    DLSYM(GetPlatformIDs);
-    DLSYM(GetProgramBuildInfo);
-    DLSYM(GetProgramInfo);
-    DLSYM(SetKernelArg);
-    DLSYM(CreateKernel);
-    DLSYM(CreateBuffer);
-    DLSYM(CreateProgramWithBinary);
-    DLSYM(CreateProgramWithSource);
-    DLSYM(ReleaseMemObject);
-    DLSYM(ReleaseProgram);
-    DLSYM(ReleaseKernel);
-    DLSYM(ReleaseCommandQueue);
-    DLSYM(ReleaseContext);
-    DLSYM(GetKernelInfo);
-    DLSYM(GetCommandQueueInfo);
-    DLSYM(GetMemObjectInfo);
-    DLSYM(GetContextInfo);
-    DLSYM(ReleaseDevice);
-    DLSYM(UnloadPlatformCompiler);
-    DLSYM(SetMemObjectDestructorCallback);
-    DLSYM(CreateSubBuffer);
-    DLSYM(RetainProgram);
-    DLSYM(RetainMemObject);
+    try {
+        DLSYM(CreateCommandQueue);
+        DLSYM(CreateContext);
+        DLSYM(BuildProgram);
+        DLSYM(EnqueueNDRangeKernel);
+        DLSYM(EnqueueReadBuffer);
+        DLSYM(EnqueueWriteBuffer);
+        DLSYM(Finish);
+        DLSYM(GetDeviceIDs);
+        DLSYM(GetDeviceInfo);
+        DLSYM(GetPlatformInfo);
+        DLSYM(GetPlatformIDs);
+        DLSYM(GetProgramBuildInfo);
+        DLSYM(GetProgramInfo);
+        DLSYM(SetKernelArg);
+        DLSYM(CreateKernel);
+        DLSYM(CreateBuffer);
+        DLSYM(CreateProgramWithBinary);
+        DLSYM(CreateProgramWithSource);
+        DLSYM(ReleaseMemObject);
+        DLSYM(ReleaseProgram);
+        DLSYM(ReleaseKernel);
+        DLSYM(ReleaseCommandQueue);
+        DLSYM(ReleaseContext);
+        DLSYM(GetKernelInfo);
+        DLSYM(GetCommandQueueInfo);
+        DLSYM(GetMemObjectInfo);
+        DLSYM(GetContextInfo);
+        DLSYM(ReleaseDevice);
+        DLSYM(UnloadPlatformCompiler);
+        DLSYM(SetMemObjectDestructorCallback);
+        DLSYM(CreateSubBuffer);
+        DLSYM(RetainProgram);
+        DLSYM(RetainMemObject);
+    } catch (std::exception &ex) {
+        return false;
+    }
 
 #   if defined(CL_VERSION_2_0)
     uv_dlsym(&oclLib, kCreateCommandQueueWithProperties, reinterpret_cast<void**>(&pCreateCommandQueueWithProperties));
diff --git a/src/crypto/cn/CnAlgo.h b/src/crypto/cn/CnAlgo.h
index 296c52b73..b6a76089e 100644
--- a/src/crypto/cn/CnAlgo.h
+++ b/src/crypto/cn/CnAlgo.h
@@ -49,7 +49,7 @@ public:
     constexpr inline bool isR() const            { return ALGO == Algorithm::CN_R; }
     constexpr inline size_t memory() const       { static_assert(ALGO > Algorithm::INVALID && ALGO < Algorithm::RX_0, "invalid CRYPTONIGHT algorithm"); return CN_MEMORY; }
     constexpr inline uint32_t iterations() const { static_assert(ALGO > Algorithm::INVALID && ALGO < Algorithm::RX_0, "invalid CRYPTONIGHT algorithm"); return CN_ITER; }
-    constexpr inline uint32_t mask() const       { return ((memory() - 1) / 16) * 16; }
+    constexpr inline uint32_t mask() const       { return static_cast<uint32_t>(((memory() - 1) / 16) * 16); }
 
     inline static size_t memory(Algorithm::Id algo)
     {