Archive for the ‘Tests and Reviews’ Category

scryptcc-scrypt-cloud-mining-service

Times quickly goes by and we have already used the scryptcc cloud mining service for a few days and can share more about our experience with it. So far we are left with somewhat mixed feelings, on one hand the service itself works find and stable, every 10 minute session you are getting your earnings from the purchased cloud hashrate available in your Balance from the purchased hashrate. On the other hand there are some annoying bugs that are not being fixed and the support knows about them as we’ve reported them a few days ago, as probably other users of the service also did the same. The Break In Time continues to vary quite a lot, changing based on the current profitability of the crypto coins being mined by the service. In general it is normally hovering about 180 days, but we’ve seen going down to 90 days and going up to 230 days at times.

scryptcc-things-needing-fixes

One of the most annoying bugs that the the guys behind the scryptcc service haven’t resolved yet is related to trading when you want to trade all of of the available BTC for KHS, the rounding apparently sometimes gives wrong result and you need to manually edit the value for the trade to be executed. We’ve noticed and reported that issue soon after we started using the service, but it hasn’t yet been resolved. On the trade page the trading chart is also not working properly and the last date on it is 17th January, another bug that the support is aware of and hasn’t been fixed yet. There are other small issues we’ve stumbled with as well that we have reported and that haven’t still be resolved. The excuse we get is that they are still in Beta and will fix it when they can – not very professional response and approach, and though these are no serious issues they can get annoying and can drive you away from the service, especially if another better similar service appears as there is currently no viable alternative available for scrypt could mining.

So far scryptcc has sold about 152000 KHS (152 MHS) worth of Scrypt hashrate to users from their available mining hardware and have available on the market about 48000 KHS (48 MHS) left on the trade market. This is their second batch of 100 MHS hashrate. We are mining hardware getting released for sale by the service providers at a price of 0.00144444 BTC per KHS, and we expect that after the available hashrate gets traded the price may start to get up, unless there is a third batch of 100 MHS. So far the trading is not that active as in order to sell some hashrate you need to set a price lower than 0.00144444 BTC per KHS, but this should change as soon as the big sale order gets completely traded. The idea to buy now and not go for the long expecting ROI, but instead mining some coins then selling at a higher price your KHS after a week or two is also an interesting option to consider.

scryptcc-my-cloud-hasring-rate

So far we’ve been reinvesting into KHS all that we have earned from mining and our cloud mining hashrate is currently 237 KHS, up from the 232 KHS that we’ve purchased initially a few days ago. What we don’t like is that so far you can only fund your Balance with BTC and your earnings form the purchased Scrypt mining cloud hashrte are also being payed to you in BTC. It would’ve been nice to have the option to use LTC as well, saving you the trouble to go through an exchange. Another thing that we do not like much for the moment is that there is no statistics or information about the crypto currency that is currently being mined. Some sort of a news and updates section would also be nice, there is a forum, but there is not much activity there yet not only by users, but by the team behind the service as well. There is chat functionality built into the website, but there are not timestamps for the messages, so you have no clear idea how old they may be when you open it up. We know the service is still new and in Beta, but we as users of the service want to see that things are actually happening and improving as we continue using it, and so far we are not seeing that happening yet. Maybe the team is busy with the backend or the hardware, however this does not mean that they should not put effort into improving the frontend of the service and the user experience in general. Still we are positive that things will move in the right direction, even though they appear to be a bit unprofessional at the moment, so we’ll give a bit more time before drawing conclusions.

For more information and to try out the scryptcc cloud mining service yourself…

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.

nvidia-geforce-gtx-750-ti-maxwell

Nvidia has just announced a new GPU architecture called Maxwell and their first GPU to use it – GeForce GTX 750 Ti. We’ve had a card for testing and decided to give it a try and see how it will perform for Scrypt mining as normally Nvidia GPUs are not providing as much hashrate as AMD graphics cards for crypto mining. The next Maxwell architecture from Nvidia however is interesting, because it is focused on optimization for better performance per watt – something that crypto coin miners are also interested a lot in. The new GeForce GTX 750 Ti GPUs have a power consumption of just about 60W and the price range for these cards is $150 USD. When you add the fact that a GeForce GTX 750 Ti based on the Maxwell architecture without overclock makes about 265 KH/s using CUDAminer these become an interesting solution for crypto miners.


CUDAminer startup parameters for 265 KH/s:

cudaminer.exe -o stratum+tcp://eu.multipool.us:7777 -u yourworker.cuda -p password -i 0 -l T5x24 -C 1


cudaminer-geforce-gtx-750-ti

Furthermore after overclocking the GeForce GTX 750 Ti you can get close up to 300 KH/s hashrate out of the card without problems. There is a chance if the card allows higher overclocking frequencies and higher voltage operation as well as if it has external power and you can increase the power limiter to over 100% to get even higher performance out of it. Furthermore have in mind that CUDAminer is hot yet optimized to support the new Maxwell architecture and the hashrate we are getting out of it is with the kernel for the older Kepler architecture that is used for GTX 780 cards. So there is a chance for even higher performance with a specially optimized CUDAminer for the new Maxwell architecture…


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