pci-express-x1-x16-usb-30-extender

When we are talking about GPU-based mining rigs for crypto currencies it is common for PCI-E extenders (or risers) to be used in order to be able to put more video cards on a single motherboard and use not only the available PCI Express x16 slots, but the smaller x1, x4 and x8 as well that were originally not designed to be used by video cards. You would normally not want to use these smaller slots with less PCI-E lanes for video cards that will be used for gaming for example, but they are more than enough for mining. Up until recently you would use a x1 to x1 or x1 to x16 PCI-E raiser (Extended) with a short ribbon cable in order to utilize the smaller PCI Express slots for mining. But there is new and very interesting alternative available now – PCI Express x1-x16 USB 3.0 extenders.

We have picked up a few of these new extenders to try them out as they look better designed and built as compared to the ones using ribbon cables, no to mention that the newer USB-based ones also offer some good advantages. Now, before continuing with out experience and impressions we should make something clear – these extenders only use USB 3.0 cable for data transfer they still connect to PCI-Express slot on the motherboard one one end and have a PCI-E slot that you put the video card in on the other end. They use USB 3.0 cable for data transfer as it is a reliable solution for high-speed data transfer and with good quality cable that is shielded you can easily get 50, 60 or even 100 cm length of the cable without problems. We have picked up extenders that do come with a long 1 meter cable and they work problem free and allow you to place the video cards further away from the motherboard and other cards, so that you can get better airflow and cooling.

Aside from the additional length that can easily be up to 1 meter (up to 20-25 cm for ribbon cable extenders) these extenders are also powered, meaning that your motherboard will not need to provide any power over the PCI-E slot to the video card – all the power coming from the PCI-E slot of the extender is supplied by an external molex power connector, so you can safely use even video cards that do not have additional PCI-E power connector on their boards without worrying that you can overload your motherboard that is not designed to supply so much power over the PCI-E bus for multiple video cards. We have tested these extenders with cards with both no external PCI-E power as well as with models that do have additional power connector and they all worked just fine. Also tested with both Nvidia and AMD graphics processors and no issues with both types, though you should note that using Nvidia GPU such as the GeForce GTX 750 Ti with CUDAminer you will be getting a bit lower performance when using an extender (any kind of PCI-E extender). AMD graphics do not seem to have this problem, so the most likely reason is in the fact that you are using less PCI-E lanes for the video card and although AMD with OpenCL does not seem to have a problem, Nvidia with CUDA appears to provide a slightly lower performance.

So if you are using a GeForce GTX 750 Ti with stock frequencies and are getting 255 KHS for Scrypt mining with the card directly plugged in the motherboard, if you put it on an x1 PCI-E extender you might get slightly lower performance in the 240-245 KHS range. The same goes for results with the card overclocked, from about 300 KHS on motherboard you can expect 285-290 KHS when you are using a x1 PCI-E extender. Unfortunately to avoid that you need to use full x16 PCI-E slots and/or extenders and that could limit significantly the number of cards you can install on a single motherboard.

In short, we are really satisfied with the PCI Express x1-x16 USB 3.0 Extenders. They offer better build quality and reliability as compared to ribbon cable extenders. You also get more freedom for placement of the video cards thanks to the longer cables for better airflow and cooling performance. The slight drop in performance when using Nvidia-based graphics cards for mining with the extenders is to be expected, but might be resolved in future updates for CUDAminer for example.

energycoin-logo

EnergyCoin (ENRG) is a pure PoS coin which generates coins through PoS blocks. Except the first block where it generates the initial 101 million coins, no PoW mining will get any coins. All every person has to do is post it on our facebook, twitter or reddit page, and add a signature to btctalk profile. After distribution is over energycoin is mineable by simply running your wallet. Thus a huge mining cost of hardware and millions of electricity costs are saved.

EnergyCoin also adopts a variable PoS rate with the following annual interest rate: Year-1: 10% Year-2: 8% Year-3: 6% Year-4: 4% Year-5: 2% Year 6 has only 1% of annual interest. 30 seconds block time to make sure network is stable and fast at the same time -Difficulty retarget is based on each block ensures to keep the difficulty logical -Scarce but not too scarce to be uninteresting or not usable. 101 million coins in distribution and interest values were decided to make sure the coin retains its value

Website:
Announcement at Bitcointalk

Block Explorer:
https://chainz.cryptoid.info/enrg/

Coin Specifications

  • Scrypt POS/PoW Hybrid (No PoW Reward)
  • Max Coins: 110 Million and yearly interests
  • Year 1: 10% interest, 8%, 6%, 4%, 2% and then down to 1 % each year after that
  • Block Time: 30 seconds
  • Confirmations: 3 to confirm tx
  • Stake age: minimum 1 day to stake coins
  • Transaction confirmation time: 6 blocks or ~9 minutes
  • Block maturity time: 100 blocks or ~2 hours
  • Premine: 100% given away free to bitcointalk members

Wallet:
Online Staking Wallet
Windows
Android

Source Code:
at GitHub

Ports:
– RPC Port: 22706
– P2P Port: 22705

Mining Pools:
No pools available, PoS only coin.

Coin Exchanges:
Bittrex

pbmining-5-year-btc-mining-contracts

We’ve been using the PB Mining Bitcoin cloud mining service for almost a week already and since the BTC network difficulty just increased by about 21% we have decided to report on our current earnings with the previous difficulty. We have started testing the BTC cloud mining service by purchasing 1 GHS with a price of 0.0107 BTC per GHS for the purposes of our tests. Now, after the difficulty has been just increased the there is a new price of just 0.0089 BTC per GHS. This means that at the moment you can purchase 500 GHS for about 4.45 BTC as opposed to 5.35 BTC for the same hashrate last week. This price reduction with the increase in Bitcoin network difficulty is a good thing and makes the service even more attractive, so we are already considering of purchasing some more GHS.

pbmining-current-earnings-status

Let us see how things are going in terms of earnings, since our testing has started we got a small payment (they are sent every Sunday before Midnight) and currently our earnings from the 1 GHS purchased equal 0.00075838 BTC (not including the payment that was already sent). These earnings are for mining in the last 4 and a half days after we got a payment on Sunday. With the previous difficulty the estimate was 0.0001607 BTC per day earnings with 1 GHS hashrate so for 4.5 days this equals to 0.00072315 BTC and for 5 days 0.00080350 BTC. With our current earnings in between these two numbers we can say that we are very happy with the results we are getting so far. And with the update of the price for 5 years mining contract the PB Mining Bitcoin cloud mining service is getting more and more attractive option. Sure there are other alternatives available, but they try to not only sell you higher priced GHS, but also make you trade them while they mine for you in order to get higher profit (or loose more trying to do that). This service on the other hand is a long term contract where you cannot sell your purchase GHS, however they will continue to mine for you for 5 years with expected return of investment in roughly 6-8 months currently estimated.

For more information and to try out the PB Mining Bitcoin cloud mining service…

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