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leaserig-mining-rigs-for-hire

LeaseRig is an interesting new service that allows you to rent mining rigs for a limited time period that will mine for you in your preferred pool and your preferred crypto currency for the duration of the lease. There are mining rigs available for Scrypt, SHA-256, Scrypt-Jane, Keccak (SHA-3), Scrypt-A-nFactor and DRKMix (Darkxoin mining). These rigs are provided by users and the service LeaseRig only connects you to the mining rig providers, processing payments and acts as control and monitoring panel. Everything seems very quick and easy to start using the service if you want to rent mining rigs and there are already quite a few available, and we were very excited at first. This is precisely why we have decided to give the service a try by renting a mining rig for 24 hours to be able to actually test how things are working and give you adequate feedback and to make a proper review of the service.

rig-leased-for-24-hours

In order to test the service we have decided to lease a smaller mining rig for longer period of time, so we choose one that is with 0.62 MHS and have rented it for 24 hour time period. The cost for leasing the rig for 24 hours was 0.01070000 BTC (you can pay only in BTC), and estimating the LTC return rate for 24 hours of mining Litecoin with that hashing power was roughly 0.1945 LTC (0.00485666 BTC). This means if we used the rig to mine LTC the profit we would get will be about half of what we have payed for renting the mining rig, so we have decided to go for the currently more profitable DOGE. The projected mined crypto with that hasrate for a day by the pool (Coinotron) was about 2600-2700 DOGE or up to about 0.00567000 BTC with the current exchange rate. Again less than what we have to pay for renting the mining rig, but we decided to give it a try as we were actually willing to test the service… you can find better prices for higher hashrate and with longer lease time you can end up with profit according to calculations.

rig-leased-for-24-hours-2

Everything started very good, the BTC deposit has appeared and was available for use very fast. We have hired the mining rig, removed the rigs default pool settings and set our pool and worker settings for mining DOGE at Coinotron and in a moment the rig started working. For a few hours everything was running smooth and problem free, so we stopped checking the Mining Rig status every few minutes and a few more hours later we checked to see if everything is still fine and it was not. The mining pools and settings were back to the default ones for the mining rig we have rented and it was not mining to our pool (it was gone from the list of pool) and was mining for the rig owner with more than 12 hours left from our contract. This has probably continued for an hour or two at least before we have noticed it, we again changed the pool settings to ours for mining DOGE in Coinotron and have removed the default ones. After that going for some sleep and waking up in the morning and checking the status with just about 2 hours more left from our lease the rig was again back to the default pools and our mining pool info was not in the list and it was not mining for us. This meant that again the rented rig was not mining for us for at least a few hours, again setting the proper settings for the remaining time of our contract and there were no more problems until the lease time has finished.

leaserig-coinotron-actual-mined-doge

The result from our 24 hour rent of the mining rig was really awful. Instead for the projected 2600-2700 DOGE getting mined for the lease time, we ended up with only about half of that actually mined or about 1300 DOGE. This means that due to the two times that our pool settings were gone and the mining rig was not mining for as as per the contract before us noticing has totaled in probably 12 hours. This is really unacceptable, even though after our contract has finished we can still see the leased mining rig mining for us at the Coinotron pool with a slightly lower hashrate for about an hour already we are still not happy at all.

After reading a bit more, it seems that the problem with the pool settings getting reverted back to the default set by the mining rig operator can happen if you restart the miner on the rig and you need to manually reset them to your own settings each time. So if the mining rig does not get restarted or the miner software on it at least you might not have the problem with the pools reverting back to the owner of the rig, but in hour 24 hour test we have noticed this happening 2 times (maybe even more) and thus resulting in really very unsatisfactory performance of the service. You cannot expect the people that rent the rigs to be monitoring them all the time during the lease period, especially if you rent multiple rigs and for longer periods of time in order to quickly react should a problem with the pools reverting form the user set ones to the rig’s defaults.

The conclusion: we have started by renting a 0.62 MHS mining rig for 24 hours paying 0.01070000 BTC, we have mined Scrypt crypto and more specifically DOGE as it has higher profitability than LTC and at the end of our lease we have ended up with the equivalent of 0.00252630 BTC. So we actually have payed 4 times more than what our actual mining earnings are worth and that is clearly not going to make us recommend the LeaseRig service. We have ended up with half of the expected DOGE mined because of a problem with the system that reverts the mining pools to the mining rig’s defaults instead of using our mining pool and worker, so this has essentially halved our expected earnings. So for now you better not go for the LeaseRig service, until at least they figure a solution to the problem with the pools getting reset. But even without that pool issue we have experienced it is hard to go for a lease of a rig that will not only cover what you have payed for renting it, but will end up with some profit for you! You could actually be more interested in becoming one of the mining rig providers and earn some cash for leasing your mining rig equipment, because this actually seems more profitable than to be renting rigs.

Other similar services offering Renting of Mining Rigs or Hashrate:
MiningRigRentals
Nicehash

darkcoin-altenrative-crypto

DarkCoin (DRK), now renamed to DASH, aims to be the first privacy-centric cryptographic currency with fully encrypted transactions and anonymous block transactions. These features are a work on progress and will be released in stages in the near future. DarkCoin (DRK) uses a specialized CPU and GPU miners, so you will need to download these in order to be able to mine this new crypto, download links are available below.

DarkCoin uses a new chained hashing algorithm approach, with many new scientific hashing algorithms for the proof-of-work. This is so that the processing distribution is fair and coins will be distributed in much the same way Bitcoins were originally. ASICs will be much more difficult to make for these algorithms and will take years, so GPU mining should be the main solution for mining these coins.

Website
http://www.darkcoin.io/

Block Explorer / Crawler
http://explorer.darkcoin.io/chain/DarkCoin

SPECIFICATIONS

  • 0.00000% Pre-mined
  • Super secure hashing algorithm: X11 – 11 rounds of scientific hashing functions (blake, bmw, groestl, jh, keccak, skein, luffa, cubehash, shavite, simd, echo)
  • Block reward is controlled by moore’s law: (11111 / (((Difficulty+51)/6) ^ 2))
  • CPU mining initially, now also GPU mining
  • Block generation: 2.5 minutes
  • Difficulty Retargets using Kimoto Gravity Well
  • 84 Million Coins Max
  • Block reward halves every year
  • Encrypted transaction network: Work In Progress
  • Anonymous blockchain using coinjoin technology: Work In Progress

DOWNLOADS
Online Wallet
Windows
Mac

Source Code
at GitHub

GPU MINERS
sgminer for AMD GPUs
ccMiner for Nvidia GPUs

POOLS
hhttp://www.drkpool.com
https://www2.coinmine.pl/drk/
http://pool.darkcoin.io/
http://cpu-pool.net/drk/
http://darkcoin.miningpoolhub.com/
http://dark.suchpool.pw/
http://dark.v2.dedicatedpool.com/

EXCHANGES
Binance
Bittrex
HitBTC
Livecoin
Yobit
Gateio
Citex
Crex
Graviex
Stex
Txbit

nvidia-geforce-gtx-750-ti-maxwell-oc-mining

We’ve been playing a lot today with the new Nvidia GeForce GTX 750 Ti graphics card based on the new Maxwell architecture from Nvidia, trying to overclock it as much as possible in order to get the best possible Scrypt mining hashrate out of the card using CUDAminer. The GTX 750 Ti card we have is a reference design one and it is a bit limited in terms of overclocking options, though we have tried pushing it to the maximum possible values to see what hashrate we can squeeze from the new GPU. We have already gotten about 265 KH/s with the default settings of the card, but overclocking it has increased the performance up to almost 300 KH/s whill still in the 60W power consumption (maintained by the power limiter of the graphics card).

As you can see from the screenshot above our reference design board does not allow user control of the voltage and does not provide an option to increase the power limiter past the default value of 100%. This is done due to the fact that the TDP of the card is set at 60W and the board has no additional PCI-E power connector available, so it needs to fit in the 75W maximum power that the PCI-Express slot can provide to the card by specifications. We have pushed the GPU to +135 MHz which is the maximum value that EVGA Precision and MSI Afterburner give us available and the video memory to +650 MHz as the maximum stable value resulting in about 297 KH/s hasrate that can be squeezed out of the 60W TDP (100% power limiter).

What we have to do now is look for alternative boards that do not follow the Nvidia reference design and that do have more headroom for overclocking – PCI-E power connector and the ability to increase the GPU voltage along with the option for more than 100% for the power limiter. This can give us the ability to squeeze some more KH/s from the GTX 750 Ti as the GPU is clearly handling overclocking very well and can most likely handle even higher clocks without increasing too much the power consumption. As you can see with the fan of the very small and basic stock cooler at 100% the operating temperature of the GPU is just about 54 degrees Celsius, so with a better cooler higher clocks should not be a problem at all… after all 60W is something that is not hard to cool at all nowadays.

We have just tried the card on a x16 PCI-E extender and there seems to be a problem with the normal operation. The fact that the card needs 60W over the PCI-E slot and has not external power over PCI-E power connector can cause problems if you wish to use extenders that do not have molex power connectors. So if you plan on using GTX 750 Ti with extenders it will be a wise idea to go for cards that do come with PCI-E 6-pin power connector on them to save some trouble. The x16 PCI-E extender we have tried works just fine with a Radeon R9 280X card, so the problem is not in the extender.


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