We’ve recently built a Scrypt mining rig consisting of four AMD Radeon R9 290 by XFX for a friend and since this was actually our first rig with Radeon R9 290 cards we’ve had some interesting findings that we decided to share with you, so if you have some of these troubles we might be able to help. Aside from the four XFX video cards we’ve used an EVGA 1300W PSU (you can see the total system power consumption of 1282W from the mains), Intel Celeron G1820 processor and AsRock H81 Pro BTC motherboard, together with 4GB and Windows 7 OS. For the video cards we have used PCI-E x1 to x16 USB 3.0 Extenders with 1 meter long cable and the cards did not have any trouble working like that. Note that the Radeon R9 290 cards are not considered to be the best option for Scrypt mining, however with R9 280X cards harder to find some people decide to go for the more easily found 290 or 290X models. But unlike with Radeon R9 280X, the R9 290/290X cards have more specifics and could cause you some extra headaches until you finally make them work as they should and provide decent hashrate without problems.


The average hashrate we got from the cards running at stock frequencies of 947 MHz GPU and 1250 MHz video memory got us about 857 KH/S per card or a total hashrate of about 3.4 MH/S. This is what is considered a fairly good results for Radeon R9 290 cards and unfortunately overclocking these cards did not help us in getting higher hashrate, not that we wanted to overclock them as they are already getting quite hot mining Scrypt cryptos. It seems that XFX’s cooling is not that great for mining crypto coins as the temperatures of the VRMs gets easily over 100 degrees Celsius and that is not that great for 24/7 mining even though they are probably rated at up to about 120 degrees C or even a bit more.

One very important thing in making the AMD Radeon R9 290 or 290X cards is how you call up the cgminer, because you need to use a high thread concurrency value that often tends to bring some issues with cgminer. In order to ensure that you can start cgminer without problems you can start by using the command lines below to call cgminer.exe from a BAT file:

timeout 1
start /realtime cgminer.exe --scrypt -o stratum+tcp://us-east.multipool.us:7777 -u yourworker.1 -p password --thread-concurrency 22516 -g 1 --lookup-gap 2 -w 512 -I 20

Note that sometimes even after calling cgminer with the above commands and save a congif file and then you run cgminer.exe directly and it loads up the config file you can still get errors. So if you want to use the config file after you start cgminer with the above commands and save them in config just remove all of the parameters from the cgminer.exe start line, but still start the miner with the BAT file!

Another very important thing regarding the use of AMD Radeon R9 290 video cards for crypto mining is that these video cards do not feature any analog video outputs, so if you plan on using the mining rig without a monitor connected to a card, then you might have trouble. And you cannot just make a dummy plug with resistors, you will need to get an HDMI to VGA or Display Port to VGA adapter to plug in in one of the available video outputs and then add resistors to the VGA output side. This is the recommend solution that can save you some trouble in making the mining rig function properly or if you want to control it remotely with TeamViewer for example. If you have a digital monitor connected and are going to be controlling and monitoring the mining rig with Radeon R9 290 cards then you don’t need to bother with digital adapters to VGA.


The Bit Mining cloud mining service for LTC and BTC recently had some technical issues that caused about a day of downtime, but it seems that the website is now back online and working. We’ve been using the service for just a few days starting with the purchase of 100 KHS of Litecoin cloud mining hashrate and the earnings from mining that we get every 24 hours we are reinvesting into buying more KHS (the service even offers automation by setting a percent for reinvestment of earnings). At the moment there are still things that apparently haven’t been restored yet, for example the trading functionality of the website is not yet operational, and some users are reporting that they are not seeing the purchased hashrate. The support however reassures that everything will be restored back to normal soon as apparently they’ve had some serious problem. Meanwhile if you are having problems logging in, then try resetting your password and login with the new one.

Another important thing that you should be aware of if you are interested in purchasing cloud mining hashrate at Bit Mining is that when you place a sell order of hashrate you have purchased it will not be mining for you ether until you cancel the order or you sell the hashrate. If you have used another alternative service for cloud mining scuh as CEX.io for example, you might expect that even the hashrate “locked” in trading is going to mine for you, but here apparently it does not.

In our ongoing tests of the Bit Mining we have also decided to try to mine with local hashrate at the pools available. The good thing here is that you can not only cloud mine, but also mine with mining hardware that you own physically at the same terms (minus maintenance fee for non cloud hashrate). However either there were some problems with the pool or you need to mine for 24 hours (or at least to be still mining when the payout happens) in order to get your earnings. We have mined with a BTC ASIC for a few hours at the pool and it was reporting hashrate and expected earnings, but as soon as we’ve stopped the miners we got 0 for Daily Payout reported and when the actual daily payout happened we got nothing for the time we spent mining. Ths could’ve been a bug, or something that is not very well documented, but we do advice to test first yourself with some low hashrate, before leaving all your miners pointed at the Bit Mining pools. For now we are going to be focusing mostly on testing the cloud mining functionality of the service and we are going to report how things go as we continue using the service.

Aside from the technical issues from the last 24 hours that Bit Mining is currently experiencing, the service worked pretty well for the few days we’ve been testing it. There were a few times when the website was loading a bit slower, but we were getting our payouts on time and had no issues in general aside from not getting anything from spending some time mining with an ASIC in their BTC pool. On the other hand the website’s interface and functionality could be improved as at the moment there are a few things that are not very user friendly, including the trading functionality. But we’ll see how things go from now on, at least the support is here and replying to users about their problems and it seems that issues are actually being worked on unlike in some other similar services. And we’ve had a fair share of issues with almost all cloud mining services that we’ve tried so far and the only one that seems to be holding up really well with no issues experienced for the last two weeks that we’ve been testing it is PBmining.


GPU Coin (GPUC) is a new Scrypt-Adaptive-Nfactor cryptocoin that just recently launched. The idea of the authors of this crypto is that they will have an on-line store that specializes in keeping a large stock of GPUs that will only be available to be purchased with GPU Coin, something that might work well if you are in USA. This is probably where the name of the coin also came from. Note that currently the block reward is set to 1 and the full rewards start at block 2600! You need to use VertMiner for mining GPU Coin and not the standard cgminer, because of the algorithm used by the coin.


Block Explorer / Crawler


  • Scrypt-Adaptive-Nfactor Algo
  • PoW Algorithm: Scrypt-N
  • Retarget: Every block using KGW
  • Block Time: 60 seconds
  • Block time target: 30 seconds
  • Initial Block Reward: 20,000
  • Max Supply: 13.5 billion
  • Premine: 325,000,000 for IPO, 75,000,000 for bounties


Source Code
at GitHub


Atomic Trade