diff --git a/CMakeLists.txt b/CMakeLists.txt
index d40d76ef2..2641f1bda 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,6 +63,14 @@ function(configureProject)
 		add_definitions(-DETH_GUI)
 	endif()
 
+	if (CPUID_FOUND)
+		add_definitions(-DETH_CPUID)
+	endif()
+
+	if (CURL_FOUND)
+		add_definitions(-DETH_CURL)
+	endif()
+
 	add_definitions(-DETH_TRUE)
 endfunction()
 
@@ -272,8 +280,6 @@ elseif (BUNDLE STREQUAL "user")
 	set(TESTS OFF)
 endif ()
 
-configureProject()
-
 # Default CMAKE_BUILD_TYPE to "Release".
 set(CMAKE_BUILD_TYPE CACHE STRING "Release")
 if ("x${CMAKE_BUILD_TYPE}" STREQUAL "x")
@@ -290,6 +296,10 @@ if ("x${TARGET_PLATFORM}" STREQUAL "x")
 	endif ()
 endif ()
 
+include(EthDependencies)
+
+configureProject()
+
 message("------------------------------------------------------------------------")
 message("--                  CMake Version                            ${CMAKE_VERSION}")
 message("-- CMAKE_BUILD_TYPE Build type                               ${CMAKE_BUILD_TYPE}")
@@ -297,6 +307,8 @@ message("-- TARGET_PLATFORM  Target platform                          ${TARGET_P
 message("-- BUNDLE           Build bundle                             ${BUNDLE}")
 message("--------------------------------------------------------------- features")
 message("--                  Chromium support                         ${ETH_HAVE_WEBENGINE}")
+message("--                  Hardware identification support          ${CPUID_FOUND}")
+message("--                  HTTP Request support                     ${CURL_FOUND}")
 message("-- VMTRACE          VM execution tracing                     ${VMTRACE}")
 message("-- PROFILING        Profiling support                        ${PROFILING}")
 message("-- FATDB            Full database exploring                  ${FATDB}")
@@ -322,9 +334,7 @@ endif ()
 include(EthCompilerSettings)
 message("-- CXXFLAGS: ${CMAKE_CXX_FLAGS}")
 
-
 # this must be an include, as a function it would mess up with variable scope!
-include(EthDependencies)
 include(EthExecutableHelper)
 
 createBuildInfo()
diff --git a/cmake/EthDependencies.cmake b/cmake/EthDependencies.cmake
index 61c87efd2..4c6b7841a 100644
--- a/cmake/EthDependencies.cmake
+++ b/cmake/EthDependencies.cmake
@@ -59,7 +59,6 @@ if (JSONRPC)
  	find_package(MHD) 
 	message(" - microhttpd header: ${MHD_INCLUDE_DIRS}")
 	message(" - microhttpd lib   : ${MHD_LIBRARIES}")
-
 endif() #JSONRPC
 
 # TODO readline package does not yet check for correct version number
@@ -86,7 +85,7 @@ endif()
 # TODO it is also not required in msvc build
 find_package (Gmp 6.0.0)
 if (GMP_FOUND)
-	message(" - gmp Header: ${GMP_INCLUDE_DIRS}")
+	message(" - gmp header: ${GMP_INCLUDE_DIRS}")
 	message(" - gmp lib   : ${GMP_LIBRARIES}")
 endif()
 
@@ -96,6 +95,13 @@ find_package (CURL)
 message(" - curl header: ${CURL_INCLUDE_DIRS}")
 message(" - curl lib   : ${CURL_LIBRARIES}")
 
+# cpuid required for eth
+find_package (Cpuid)
+if (CPUID_FOUND)
+	message(" - cpuid header: ${CPUID_INCLUDE_DIRS}")
+	message(" - cpuid lib   : ${CPUID_LIBRARIES}")
+endif()
+
 # find location of jsonrpcstub
 find_program(ETH_JSON_RPC_STUB jsonrpcstub)
 message(" - jsonrpcstub location    : ${ETH_JSON_RPC_STUB}")
diff --git a/cmake/FindCpuid.cmake b/cmake/FindCpuid.cmake
new file mode 100644
index 000000000..8b590f44b
--- /dev/null
+++ b/cmake/FindCpuid.cmake
@@ -0,0 +1,33 @@
+# Find libcpuid
+#
+# Find the libcpuid includes and library
+#
+# if you nee to add a custom library search path, do it via via CMAKE_PREFIX_PATH
+#
+# This module defines
+#  CPUID_INCLUDE_DIRS, where to find header, etc.
+#  CPUID_LIBRARIES, the libraries needed to use cpuid.
+#  CPUID_FOUND, If false, do not try to use cpuid.
+
+# only look in default directories
+find_path(
+	CPUID_INCLUDE_DIR
+	NAMES libcpuid/libcpuid.h
+	DOC "libcpuid include dir"
+	)
+
+find_library(
+	CPUID_LIBRARY
+	NAMES cpuid
+	DOC "libcpuid library"
+	)
+
+set(CPUID_INCLUDE_DIRS ${CPUID_INCLUDE_DIR})
+set(CPUID_LIBRARIES ${CPUID_LIBRARY})
+
+# handle the QUIETLY and REQUIRED arguments and set CPUID_FOUND to TRUE
+# if all listed variables are TRUE, hide their existence from configuration view
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(cpuid DEFAULT_MSG CPUID_INCLUDE_DIR CPUID_LIBRARY)
+mark_as_advanced (CPUID_INCLUDE_DIR CPUID_LIBRARY)
+
diff --git a/eth/main.cpp b/eth/main.cpp
index 5bc6f9911..7da725b6c 100644
--- a/eth/main.cpp
+++ b/eth/main.cpp
@@ -89,7 +89,7 @@ void interactiveHelp()
 		<< "    send  Execute a given transaction with current secret." << endl
 		<< "    contract  Create a new contract with current secret." << endl
 		<< "    peers  List the peers that are connected" << endl
-#if ETH_FATDB
+#if ETH_FATDB || !ETH_TRUE
 		<< "    listaccounts  List the accounts on the network." << endl
 		<< "    listcontracts  List the contracts on the network." << endl
 #endif
@@ -112,24 +112,31 @@ void help()
 		<< "    -b,--bootstrap  Connect to the default Ethereum peerserver." << endl
 		<< "    -B,--block-fees <n>  Set the block fee profit in the reference unit e.g. ¢ (Default: 15)." << endl
 		<< "    -c,--client-name <name>  Add a name to your client's version string (default: blank)." << endl
-		<< "    -C,--check-pow <headerHash> <seedHash> <difficulty> <nonce>  Check PoW credentials for validity." << endl
+		<< "    -C,--cpu  When mining, use the CPU." << endl
 		<< "    -d,--db-path <path>  Load database from path (default:  ~/.ethereum " << endl
 		<< "                         <APPDATA>/Etherum or Library/Application Support/Ethereum)." << endl
+		<< "    --benchmark-warmup <seconds>  Set the duration of warmup for the benchmark tests (default: 15)." << endl
+		<< "    --benchmark-trial <seconds>  Set the duration for each trial for the benchmark tests (default: 3)." << endl
+		<< "    --benchmark-trials <n>  Set the duration of warmup for the benchmark tests (default: 5)." << endl
 		<< "    -D,--create-dag <this/next/number>  Create the DAG in preparation for mining on given block and exit." << endl
 		<< "    -e,--ether-price <n>  Set the ether price in the reference unit e.g. ¢ (Default: 30.679)." << endl
 		<< "    -E,--export <file>  Export file as a concatenated series of blocks and exit." << endl
 		<< "    --from <n>  Export only from block n; n may be a decimal, a '0x' prefixed hash, or 'latest'." << endl
 		<< "    --to <n>  Export only to block n (inclusive); n may be a decimal, a '0x' prefixed hash, or 'latest'." << endl
 		<< "    --only <n>  Equivalent to --export-from n --export-to n." << endl
-		<< "    -f,--force-mining  Mine even when there are no transaction to mine (Default: off)" << endl
+		<< "    -f,--force-mining  Mine even when there are no transactions to mine (Default: off)" << endl
+#if ETH_JSONRPC || !ETH_TRUE
+		<< "    -F,--farm  Put into mining farm mode (default GPU with CPU as fallback)." << endl
+#endif
+		<< "    -G,--gpu  When miningm use the GPU." << endl
 		<< "    -h,--help  Show this help message and exit." << endl
 		<< "    -i,--interactive  Enter interactive mode (default: non-interactive)." << endl
 		<< "    -I,--import <file>  Import file as a concatenated series of blocks and exit." << endl
-#if ETH_JSONRPC
+#if ETH_JSONRPC || !ETH_TRUE
 		<< "    -j,--json-rpc  Enable JSON-RPC server (default: off)." << endl
 		<< "    --json-rpc-port	 Specify JSON-RPC server port (implies '-j', default: " << SensibleHttpPort << ")." << endl
 #endif
-#if ETH_EVMJIT
+#if ETH_EVMJIT || !ETH_TRUE
 		<< "    -J,--jit  Enable EVM JIT (default: off)." << endl
 #endif
 		<< "    -K,--kill  First kill the blockchain." << endl
@@ -137,17 +144,20 @@ void help()
 		<< "    -l,--listen <ip>  Listen on the given IP for incoming connections (default: 0.0.0.0)." << endl
 		<< "    -u,--public-ip <ip>  Force public ip to given (default: auto)." << endl
 		<< "    -m,--mining <on/off/number>  Enable mining, optionally for a specified number of blocks (Default: off)" << endl
-		<< "    -n,-u,--upnp <on/off>  Use upnp for NAT (default: on)." << endl
+		<< "    -M,--benchmark  Benchmark for mining and exit; use with --cpu and --gpu." << endl
 		<< "    -o,--mode <full/peer>  Start a full node or a peer node (Default: full)." << endl
 		<< "    -p,--port <port>  Connect to remote port (default: 30303)." << endl
 		<< "    -P,--priority <0 - 100>  Default % priority of a transaction (default: 50)." << endl
+		<< "    --phone-home <on/off>  When benchmarking, publish results (Default: on)" << endl
 		<< "    -R,--rebuild  First rebuild the blockchain from the existing database." << endl
 		<< "    -r,--remote <host>  Connect to remote host (default: none)." << endl
 		<< "    -s,--secret <secretkeyhex>  Set the secret key for use with send command (default: auto)." << endl
 		<< "    -S,--temporary-secret <secretkeyhex>  Set the secret key for use with send command, for this session only." << endl
+		<< "    -u,--upnp <on/off>  Use upnp for NAT (default: on)." << endl
 		<< "    -v,--verbosity <0 - 9>  Set the log verbosity from 0 to 9 (Default: 8)." << endl
-		<< "    -x,--peers <number>  Attempt to connect to given number of peers (Default: 5)." << endl
 		<< "    -V,--version  Show the version and exit." << endl
+		<< "    -w,--check-pow <headerHash> <seedHash> <difficulty> <nonce>  Check PoW credentials for validity." << endl
+		<< "    -x,--peers <number>  Attempt to connect to given number of peers (Default: 5)." << endl
 		;
 		exit(0);
 }
@@ -221,7 +231,9 @@ enum class OperationMode
 	Node,
 	Import,
 	Export,
-	DAGInit
+	DAGInit,
+	Benchmark,
+	Farm
 };
 
 enum class Format
@@ -231,6 +243,70 @@ enum class Format
 	Human
 };
 
+enum class MinerType
+{
+	CPU,
+	GPU
+};
+
+void doBenchmark(MinerType _m, bool _phoneHome, unsigned _warmupDuration = 15, unsigned _trialDuration = 3, unsigned _trials = 5)
+{
+	BlockInfo genesis = CanonBlockChain::genesis();
+	genesis.difficulty = 1 << 18;
+	cdebug << genesis.boundary();
+
+	GenericFarm<Ethash> f;
+	f.onSolutionFound([&](ProofOfWork::Solution) { return false; });
+
+	string platformInfo = _m == MinerType::CPU ? ProofOfWork::CPUMiner::platformInfo() : _m == MinerType::GPU ? ProofOfWork::GPUMiner::platformInfo() : "";
+	cout << "Benchmarking on platform: " << platformInfo << endl;
+
+	cout << "Preparing DAG..." << endl;
+	Ethash::prep(genesis);
+
+	genesis.difficulty = u256(1) << 63;
+	genesis.noteDirty();
+	f.setWork(genesis);
+	if (_m == MinerType::CPU)
+		f.startCPU();
+	else if (_m == MinerType::GPU)
+		f.startGPU();
+
+	map<uint64_t, MiningProgress> results;
+	uint64_t mean = 0;
+	uint64_t innerMean = 0;
+	for (unsigned i = 0; i <= _trials; ++i)
+	{
+		if (!i)
+			cout << "Warming up..." << endl;
+		else
+			cout << "Trial " << i << "... " << flush;
+		this_thread::sleep_for(chrono::seconds(i ? _trialDuration : _warmupDuration));
+
+		auto mp = f.miningProgress();
+		f.resetMiningProgress();
+		if (!i)
+			continue;
+		auto rate = mp.rate();
+
+		cout << rate << endl;
+		results[rate] = mp;
+		mean += rate;
+		if (i > 1 && i < 5)
+			innerMean += rate;
+	}
+	f.stop();
+	cout << "min/mean/max: " << results.begin()->second.rate() << "/" << (mean / _trials) << "/" << results.rbegin()->second.rate() << " H/s" << endl;
+	cout << "inner mean: " << (innerMean / (_trials - 2)) << " H/s" << endl;
+
+	(void)_phoneHome;
+	if (_phoneHome)
+	{
+		// TODO: send f.miningInfo() along with f.platformInfo() to Marian.
+	}
+	exit(0);
+}
+
 int main(int argc, char** argv)
 {
 	// Init defaults
@@ -240,6 +316,9 @@ int main(int argc, char** argv)
 	OperationMode mode = OperationMode::Node;
 	string dbPath;
 
+	/// Mining options
+	MinerType minerType = MinerType::CPU;
+
 	/// File name for import/export.
 	string filename;
 
@@ -287,6 +366,12 @@ int main(int argc, char** argv)
 	double etherPrice = 30.679;
 	double blockFees = 15.0;
 
+	/// Benchmarking params
+	bool phoneHome = true;
+	unsigned benchmarkWarmup = 15;
+	unsigned benchmarkTrial = 3;
+	unsigned benchmarkTrials = 5;
+
 	string configFile = getDataDir() + "/config.rlp";
 	bytes b = contents(configFile);
 	if (b.size())
@@ -319,6 +404,21 @@ int main(int argc, char** argv)
 			mode = OperationMode::Export;
 			filename = argv[++i];
 		}
+		else if (arg == "-F" || arg == "--farm")
+			mode = OperationMode::Farm;
+		else if (arg == "--phone-home" && i + 1 < argc)
+		{
+			string m = argv[++i];
+			if (isTrue(m))
+				phoneHome = true;
+			else if (isFalse(m))
+				phoneHome = false;
+			else
+			{
+				cerr << "Bad " << arg << " option: " << m << endl;
+				return -1;
+			}
+		}
 		else if (arg == "--format" && i + 1 < argc)
 		{
 			string m = argv[++i];
@@ -355,6 +455,33 @@ int main(int argc, char** argv)
 				return -1;
 			}
 		}
+		else if (arg == "--benchmark-warmup" && i + 1 < argc)
+			try {
+				benchmarkWarmup = stol(argv[++i]);
+			}
+			catch (...)
+			{
+				cerr << "Bad " << arg << " option: " << argv[i] << endl;
+				return -1;
+			}
+		else if (arg == "--benchmark-trial" && i + 1 < argc)
+			try {
+				benchmarkTrial = stol(argv[++i]);
+			}
+			catch (...)
+			{
+				cerr << "Bad " << arg << " option: " << argv[i] << endl;
+				return -1;
+			}
+		else if (arg == "--benchmark-trials" && i + 1 < argc)
+			try {
+				benchmarkTrials = stol(argv[++i]);
+			}
+			catch (...)
+			{
+				cerr << "Bad " << arg << " option: " << argv[i] << endl;
+				return -1;
+			}
 		else if (arg == "-K" || arg == "--kill-blockchain" || arg == "--kill")
 			killChain = WithExisting::Kill;
 		else if (arg == "-B" || arg == "--rebuild")
@@ -362,8 +489,7 @@ int main(int argc, char** argv)
 		else if ((arg == "-c" || arg == "--client-name") && i + 1 < argc)
 			clientName = argv[++i];
 		else if ((arg == "-a" || arg == "--address" || arg == "--coinbase-address") && i + 1 < argc)
-			try
-			{
+			try {
 				coinbase = h160(fromHex(argv[++i], WhenError::Throw));
 			}
 			catch (BadHexCharacter&)
@@ -376,6 +502,10 @@ int main(int argc, char** argv)
 				cerr << "Bad " << arg << " option: " << argv[i] << endl;
 				return -1;
 			}
+		else if (arg == "-C" || arg == "--cpu")
+			minerType = MinerType::CPU;
+		else if (arg == "-G" || arg == "--gpu")
+			minerType = MinerType::GPU;
 		else if ((arg == "-s" || arg == "--secret") && i + 1 < argc)
 			sigKey = KeyPair(h256(fromHex(argv[++i])));
 		else if ((arg == "-S" || arg == "--session-secret") && i + 1 < argc)
@@ -405,7 +535,7 @@ int main(int argc, char** argv)
 					return -1;
 				}
 		}
-		else if ((arg == "-C" || arg == "--check-pow") && i + 4 < argc)
+		else if ((arg == "-w" || arg == "--check-pow") && i + 4 < argc)
 		{
 			string m;
 			try
@@ -442,6 +572,8 @@ int main(int argc, char** argv)
 				return -1;
 			}
 		}
+		else if (arg == "-M" || arg == "--benchmark")
+			mode = OperationMode::Benchmark;
 		else if ((arg == "-B" || arg == "--block-fees") && i + 1 < argc)
 		{
 			try
@@ -564,6 +696,9 @@ int main(int argc, char** argv)
 	if (mode == OperationMode::DAGInit && !(initDAG == LatestBlock || initDAG == PendingBlock))
 		doInitDAG(initDAG);
 
+	if (mode == OperationMode::Benchmark)
+		doBenchmark(minerType, phoneHome, benchmarkWarmup, benchmarkTrial, benchmarkTrials);
+
 	if (!clientName.empty())
 		clientName += "/";
 
diff --git a/libethash-cl/ethash_cl_miner.cpp b/libethash-cl/ethash_cl_miner.cpp
index 016d8af58..c9a621e29 100644
--- a/libethash-cl/ethash_cl_miner.cpp
+++ b/libethash-cl/ethash_cl_miner.cpp
@@ -57,6 +57,33 @@ ethash_cl_miner::ethash_cl_miner()
 {
 }
 
+std::string ethash_cl_miner::platform_info()
+{
+	std::vector<cl::Platform> platforms;
+	cl::Platform::get(&platforms);
+	if (platforms.empty())
+	{
+		debugf("No OpenCL platforms found.\n");
+		return std::string();
+	}
+
+	// get GPU device of the default platform
+	std::vector<cl::Device> devices;
+	platforms[0].getDevices(CL_DEVICE_TYPE_ALL, &devices);
+	if (devices.empty())
+	{
+		debugf("No OpenCL devices found.\n");
+		return std::string();
+	}
+
+	// use default device
+	unsigned device_num = 0;
+	cl::Device& device = devices[device_num];
+	std::string device_version = device.getInfo<CL_DEVICE_VERSION>();
+
+	return "{ platform: '" + platforms[0].getInfo<CL_PLATFORM_NAME>() + "', device: '" + device.getInfo<CL_DEVICE_NAME>() + "', version: '" + device_version + "' }";
+}
+
 void ethash_cl_miner::finish()
 {
 	if (m_queue())
diff --git a/libethash-cl/ethash_cl_miner.h b/libethash-cl/ethash_cl_miner.h
index d3d9f0223..079000f55 100644
--- a/libethash-cl/ethash_cl_miner.h
+++ b/libethash-cl/ethash_cl_miner.h
@@ -23,6 +23,7 @@ public:
 	ethash_cl_miner();
 
 	bool init(ethash_params const& params, std::function<void(void*)> _fillDAG, unsigned workgroup_size = 64);
+	static std::string platform_info();
 
 	void finish();
 	void hash(uint8_t* ret, uint8_t const* header, uint64_t nonce, unsigned count);
diff --git a/libethcore/CMakeLists.txt b/libethcore/CMakeLists.txt
index f562bc948..020480d67 100644
--- a/libethcore/CMakeLists.txt
+++ b/libethcore/CMakeLists.txt
@@ -11,11 +11,15 @@ aux_source_directory(. SRC_LIST)
 
 include_directories(BEFORE ..)
 include_directories(${Boost_INCLUDE_DIRS})
+if (CPUID_FOUND)
+	include_directories(${Cpuid_INCLUDE_DIRS})
+endif ()
 
 set(EXECUTABLE ethcore)
 
 file(GLOB HEADERS "*.h")
 
+
 if(ETH_STATIC)
 	add_library(${EXECUTABLE} STATIC ${SRC_LIST} ${HEADERS})
 else()
@@ -25,6 +29,9 @@ endif()
 target_link_libraries(${EXECUTABLE} ethash)
 target_link_libraries(${EXECUTABLE} devcrypto)
 target_link_libraries(${EXECUTABLE} devcore)
+if (CPUID_FOUND)
+	target_link_libraries(${EXECUTABLE} ${CPUID_LIBRARIES})
+endif ()
 
 install( TARGETS ${EXECUTABLE} RUNTIME DESTINATION bin ARCHIVE DESTINATION lib LIBRARY DESTINATION lib )
 install( FILES ${HEADERS} DESTINATION include/${EXECUTABLE} )
diff --git a/libethcore/Ethash.cpp b/libethcore/Ethash.cpp
index a777205e9..632bc278d 100644
--- a/libethcore/Ethash.cpp
+++ b/libethcore/Ethash.cpp
@@ -23,6 +23,7 @@
 
 #include <boost/detail/endian.hpp>
 #include <boost/filesystem.hpp>
+#include <boost/algorithm/string.hpp>
 #include <chrono>
 #include <array>
 #include <thread>
@@ -38,6 +39,10 @@
 #if ETH_ETHASHCL || !ETH_TRUE
 #include <libethash-cl/ethash_cl_miner.h>
 #endif
+#if ETH_CPUID || !ETH_TRUE
+#define HAVE_STDINT_H
+#include <libcpuid/libcpuid.h>
+#endif
 #include "BlockInfo.h"
 #include "EthashAux.h"
 using namespace std;
@@ -142,6 +147,58 @@ void Ethash::CPUMiner::workLoop()
 	}
 }
 
+static string jsonEncode(map<string, string> const& _m)
+{
+	string ret = "{";
+
+	for (auto const& i: _m)
+	{
+		string k = boost::replace_all_copy(boost::replace_all_copy(i.first, "\\", "\\\\"), "'", "\\'");
+		string v = boost::replace_all_copy(boost::replace_all_copy(i.second, "\\", "\\\\"), "'", "\\'");
+		if (ret.size() > 1)
+			ret += ", ";
+		ret += "\"" + k + "\":\"" + v + "\"";
+	}
+
+	return ret + "}";
+}
+
+std::string Ethash::CPUMiner::platformInfo()
+{
+	string baseline = toString(std::thread::hardware_concurrency()) + "-thread CPU";
+#if ETH_CPUID || !ETH_TRUE
+	if (!cpuid_present())
+		return baseline;
+	struct cpu_raw_data_t raw;
+	struct cpu_id_t data;
+	if (cpuid_get_raw_data(&raw) < 0)
+		return baseline;
+	if (cpu_identify(&raw, &data) < 0)
+		return baseline;
+	map<string, string> m;
+	m["vendor"] = data.vendor_str;
+	m["codename"] = data.cpu_codename;
+	m["brand"] = data.brand_str;
+	m["L1 cache"] = toString(data.l1_data_cache);
+	m["L2 cache"] = toString(data.l2_cache);
+	m["L3 cache"] = toString(data.l3_cache);
+	m["cores"] = toString(data.num_cores);
+	m["threads"] = toString(data.num_logical_cpus);
+	m["clocknominal"] = toString(cpu_clock_by_os());
+	m["clocktested"] = toString(cpu_clock_measure(200, 0));
+	/*
+	printf("  MMX         : %s\n", data.flags[CPU_FEATURE_MMX] ? "present" : "absent");
+	printf("  MMX-extended: %s\n", data.flags[CPU_FEATURE_MMXEXT] ? "present" : "absent");
+	printf("  SSE         : %s\n", data.flags[CPU_FEATURE_SSE] ? "present" : "absent");
+	printf("  SSE2        : %s\n", data.flags[CPU_FEATURE_SSE2] ? "present" : "absent");
+	printf("  3DNow!      : %s\n", data.flags[CPU_FEATURE_3DNOW] ? "present" : "absent");
+	*/
+	return jsonEncode(m);
+#else
+	return baseline;
+#endif
+}
+
 #if ETH_ETHASHCL || !ETH_TRUE
 
 class EthashCLHook: public ethash_cl_miner::search_hook
@@ -258,6 +315,11 @@ void Ethash::GPUMiner::pause()
 	stopWorking();
 }
 
+std::string Ethash::GPUMiner::platformInfo()
+{
+	return ethash_cl_miner::platform_info();
+}
+
 #endif
 
 }
diff --git a/libethcore/Ethash.h b/libethcore/Ethash.h
index 06e6b9e96..0d33d43a8 100644
--- a/libethcore/Ethash.h
+++ b/libethcore/Ethash.h
@@ -85,6 +85,7 @@ public:
 		CPUMiner(ConstructionInfo const& _ci): Miner(_ci), Worker("miner" + toString(index())) {}
 
 		static unsigned instances() { return std::thread::hardware_concurrency(); }
+		static std::string platformInfo();
 
 	protected:
 		void kickOff() override
@@ -109,6 +110,7 @@ public:
 		~GPUMiner();
 
 		static unsigned instances() { return 1; }
+		static std::string platformInfo();
 
 	protected:
 		void kickOff() override;
diff --git a/libethcore/Miner.h b/libethcore/Miner.h
index 51a0ff6f6..71e952d5c 100644
--- a/libethcore/Miner.h
+++ b/libethcore/Miner.h
@@ -42,13 +42,14 @@ struct MiningProgress
 //	MiningProgress& operator+=(MiningProgress const& _mp) { hashes += _mp.hashes; ms = std::max(ms, _mp.ms); return *this; }
 	uint64_t hashes = 0;		///< Total number of hashes computed.
 	uint64_t ms = 0;			///< Total number of milliseconds of mining thus far.
+	uint64_t rate() const { return hashes * 1000 / ms; }
 };
 
 struct MineInfo: public MiningProgress {};
 
 inline std::ostream& operator<<(std::ostream& _out, MiningProgress _p)
 {
-	_out << (_p.hashes * 1000 / _p.ms) << "H/s = " <<  _p.hashes << " hashes / " << (double(_p.ms) / 1000) << "s";
+	_out << _p.rate() << " H/s = " <<  _p.hashes << " hashes / " << (double(_p.ms) / 1000) << " s";
 	return _out;
 }
 
@@ -112,7 +113,9 @@ public:
 		m_hashCount = 0;
 	}
 
-	uint64_t hashCount() { return m_hashCount; }
+	uint64_t hashCount() const { return m_hashCount; }
+
+	void resetHashCount() { m_hashCount = 0; }
 
 	unsigned index() const { return m_index; }
 
diff --git a/libethereum/Farm.h b/libethereum/Farm.h
index 26d4b139e..869925098 100644
--- a/libethereum/Farm.h
+++ b/libethereum/Farm.h
@@ -118,6 +118,17 @@ public:
 		return m_progress;
 	}
 
+	/**
+	 * @brief Reset the mining progess counter.
+	 */
+	void resetMiningProgress()
+	{
+		ETH_READ_GUARDED(x_minerWork)
+			for (auto const& i: m_miners)
+				i->resetHashCount();
+		resetTimer();
+	}
+
 	using SolutionFound = std::function<bool(Solution const&)>;
 
 	/**