Important update for dual mining

    Important update for Claymore dual miner, now v9.2.  Main changes are added stability with dual mining, but most importantly Decred has changed to stake Version 3 – so changes must be made to the block header.  In short, if you don’t upgrade, you’ll get 100% rejected shares.


– improved mining speed stability.
– added changes in DCR mining protocol.
– fixed possible issue with rejected DCR shares on Nicehash pool.
– added pool selection in runtime (“e” and “d” keys).
– now if devfee mining fails for a long time, miner will not stop mining, it will turn on “-nofee” option temporarily with appropriate warnings, until successful devfee mining.
– some minor improvements.
– EthMan: added ReasonID parameter to .bat file which is executed when some rig has problems, check “sample.bat” for details.

AMD Polaris update, the RX 500 series

 Well the RX570 and RX580 are now out and available for purchase, so we’ll talk about what that means for your mining operations.  First of all, these are re-brands – its the same Polaris architecture but with some improvements.  In short, they have a better factory core clock and a faster default memory clock setup.  They also have a higher TDP, which means more watt usage, but this won’t affect you that much with correct settings.  Read a really good review of the cards on anandtech if you would like to know more.

    For the home miner, a few things stand out.  One, they should be at the same price or a bit cheaper than the 400 series was at launch.  This also means that they stopped producing the 400 series so don’t expect huge price cuts as stocks go down.  The hashrate you get will be roughly the same with a bios mod, and the procedure to change the bios is the same.  What you do get is a card that will be more stable at the same clocks and voltage.  It is true the TDP is higher – but – since you undervolt this shouldn’t matter that much unless you are really pushing the GPU.  Ethereum speeds should be roughly the same, and you may see a small increase in ZCash speeds.

    So not much change for miners, only a slightly better card with updated power features.  We will wait for VEGA, as this is nothing to get excited about.

EDIT:  It is true that the signature check is re-enabled in the latest drivers, so your bios mod won’t work without a workaround.  Read up on the procedure here.  It is easy to do for windows 10.

Update for Claymore dual ETH miner v9.1

    Claymore has just dropped another update for the dual ETH miner, now at v9.1.  The speedup for DCR found in v9.0 has now been implemented for Pascal and SIA.  Otherwise there aren’t really any major changes.  A lot of people have asked me and reported that their hashrates fluctuate a lot with v9.0.  Expect the same with the new version.  But an easy way to fix this is to increase the -dcri value.  You will eventually find a sweet spot where your ETH hashrate is stable.  It might be lower, but at least it will be stable.

    In other news, Bitmaintech has released an updated version of the L3+ scrypt miner (availability may be spotty), which you can find on their chinese only webpage.  Pandaminer has also updated their Pandaminer, now with Rx470’s apparently, and no longer using the MXM variant but the full size one.  And stay tuned for the upcoming release of the RX5xx series from AMD.  A few lucky people have test units that they can play with, but we will wait to see what the real production units produce.  There might be a problem if they require the very latest drivers to run, and these may be more difficult for bios modding with the signature check.  As per usual.

Claymore ETH dual miner v9.0

 Important update today !  Claymore has released his new V9.0 for the ETH dual miner.  The main improvement is the ASM algorithm used for the second coin, in this case, DCR.  We can only assume this optimization is coming for the others as well in future updates.  You can expect DCR to improve by 40% to 75% in our experience, and on top of that, have an increase in ETH hashrate (very minor) as well.  This is due to the “fine tuning” that you must do for each card type with +/-.  Note that power consumption is also up, we see about 10-25w per Rx470/480 depending on settings.

Latest version is v9.0:

– added “-asm” option (AMD cards only) which enables assembler GPU kernels. In this mode some tuning is required even in ETH-only mode, use “-dcri” option or or “+/-” keys in runtime to set best speed.
    Currently only ETH-only and ETH-DCR modes are supported in assembler. Use “-asm 0” if you don’t want to use new assembler kernels.
    If ASM mode is enabled, miner must show “GPU #x: algorithm ASM” at startup.
– improved ETH mining speed in ASM mode for some cards, also a bit reduced power usage for some cards (fine-tuning is required via “-dcri” or “+/-” keys in runtime).
    NOTE 1: if GPU throttles, best “-dcri” value is different.
    NOTE 2: speed peak can be rather short, so change “-dcri” value slowly.
– dramatically increased DCR mining speed in assembler mode (up to 70%). Be careful, power usage is higher too.
– added “-gmap” option.
– fixed DCR Nicehash support.
– added “FINE-TUNING” section to Readme file.
– A lot of minor improvements and bug fixes.