Category Archives: Bitcoin Miners

Antminer S5 Review Soon

I ordered 2x Antminer S5 Batch 2. Couldn’t make it in time for first batch. Maybe a good thing doh, second batch could receive some tuning from first batch production.
S3 miner are good example. At first most of them were running a 440-460GH. My S3+ Batch 11 give me 500GH/S+ at full OC speed.

It cost me 2.79BTC including shipping cost to Canada. It will cost me another 100$/miner in custom fee ( estimated on previous order ).

Antminer S5 Order to Canada

S5 feature new MinerLink software to manage your miner remotely.
Looking forward to try it. I will add more information soon. 10 Days Payout Review


EDIT 2015-01-11 is a confirm SCAM
Hashie Scam Exposed
Hashtalk Discussions
End EDIT is down.
Look like a powerful hacker attack for now.
You can read how it happen here
Hashie Hacked


I purchase batch of AMhash miners 100GH at 0.12BTC / each.
Sending and withdrawing bitcoin is easy.

I sold a miner on the market for higher price than I had pay. Probably a newbie who purchase it…

Buy miner on dec 8.

Hashie Market

Sell it with profit + 8 mining days

Miner Purchase

Great doh ?

Current AMhashminer price at is 0.012BTC/10GHs or 3,78$ at 315$/BTC value. payout

Electricity fee at current BTC prices is 38% of revenue earn.

Best bang for your bucks right now. I will invest more, trusted cloud business with easy transaction. Selling / Buying work well. Simple but does what it is suppose to do.

Hashie on Bitcointalk

Free Bitmaintech Coupons For S3+, C1 and S4 Bitcoin Miners

I order twice at Bitmaintech,

I received this newsletter today

Dear Customer,

Greetings! We are glad to inform you that BITMAIN has kicked off its promotional season! BITMAIN began business exactly one year ago, and is celebrating its 1st birthday with great discounts. Coupons were issued to previous customers last weekend, to be used against the S3+, S4 and C1 miners.

$50 coupon for each S3+

$400 coupon for each S4

$50 coupon for each C1

I give away my coupons for free, got tons of them : )

Claim your coupons here

Hashtalk is the official forum of GAWminers

Mining In A Hotel Room With ASICMiner Tube

I just came back from a road trip ( for my daily work ) to western Canada.
I drove from Quebec City to a little Town near Calgary in Alberta.
3500Km+, 7000Km total to get back.

I stop by Winnipeg in Manitoba and realize that is where are located. I stop by the next morning and discover a nice business. I hang around 1hrs or 2 and get out with a ASICMiner Tube in parts. I assembled it in my hotel room the next day. Really easy and save some money by assembling it myself.

ASICMiner Tube

I mined with my Tube for over a month in different hotels.
From all the room I connected my miner, only one breaker pop : )
Miner + Coffee machine, black my entire room … doh !

Yeap, room 215, yeap, don’t know what happen … lost electricity ?
Oh… I see, we send you someone to fix that ASAP. Our apologies !

No prob … 🙂

Low-cost = they save on soldering I guess.
Visual inspection indicate very low soldering on DC plug … watch out not to stress the connector too much when connecting.

Best price in US here

Bitmain S4 : Have a Fire Extinguisher Near By !

Original Story happen here :
Hashtalk S4 Burnout Power Supply

Bitmain S4


* Chip Operating Voltage: 0.72V

* Chip Quantity per unit: 160

* Hash Rate: 2,000GH/s guaranteed

* Power Efficiency: 0.69Watt/GH/s at the wall

* Over clocking: About 10%, but not guaranteed

* 3U Rack 432mm*442mm*133mm

* PSU inside: 1400W, 80PLUS gold, C14 input socket. Power line not included. You may look for one line with no less than 16A in your local market

* Temperature: 40-50 degree Celsius tested in the mining farm

* Fan Speed: 3900RPM

* Stable but a little bit noisy

* Ethernet connection, Stand alone

* Certificate Compliance: FCC/CE

My Quick Power Calculation

First the supply specs

* PSU inside: 1400W, 80PLUS gold, C14 input socket. Power line not included. You may look for one line with no less than 16A in your local market

How much power is needed?

* Power Efficiency: 0.69Watt/GH/s at the wall

0.69W/GH/S * 2000 = 1380W of Juice at 0.72V.
1380W/1400W * 100 = 98.5% Load

Overclocking without popping out the breaker or P/S don’t surprise me.

0.80V is 10% more juice in OC
1380W * 10% = 1518W

Overload …

This one must be understand carefully :

Power line not included

Have you a big enough AC plug cable ?

You may look for one line with no less than 16A

Cheap AC plug max amps around 10A


Watts = Voltage * Amps
Amps = Watts / Voltage

You need :
On 120V circuit, 1518W/120V = 12.65A.

If your overload AC cables, overheating will happen also voltage drop.

Breaker in Canada are rated 15A on 120V circuits.

Startup current is huge on those machines too.
Lot’s of capacitor and inductance to filter power line noises.
Mean, need juice at startup or current- inrush can be 10-20% more for few milsec

Think about it

Going 220V could be safer, reduce by half amp in wiring
Quality power supplies have universal input.
Rated 120V-220V, 50-60Hz.
Min 2000W Power supply recommended !

Now time to unplug the dryer I guess ; )

Here some pics of his power supply

S4 Under Power Supply

Blow-out S4 power supply

S4 Plan B Power Supply

S4 Burnout Black PCB

S4 Faulty power Supply

This guy manage to safe the day and put a plan B in action, changed power supply and miner up again.
Lucky this time, at least the supply died like a heroes, protect circuits of damage when blowing up.

Update : Bitmaintech answer and fix the problem quickly.

Dear customers,

We are sorry to inform you that we do find a critical defect of power supply in the first batch and the first part of batch 2 Antminer S4 shipment, and have issued an official announcement on bitcointalk community regarding power supply replacement for these miners. Please find details in the following link,

We assume you might have not came across the failure issues like other customers do as we have not yet received any info from you on the power supply problems. But we do suggest you nip it in the bud and keep an eye on your miners which seems to be running well.

we decide to send you new replacement PSUs, which have been optized and improved from the previous ones and will avoid similar issues as stated in the above-mentioned link.

Now please provide us with the Order Confirmation page from of your B1 or first part of B2 S4 miners and confirm with us your full address, to which we will ship out new replacement PSUs.

Please accept our sincere apology for the inconvenience.

Tim Shao


BESt Regards

Reply Post on

Dear loyal customers,
Today we have found out that the batch of power supplies shipped out in batch 1 and the first part of batch 2 Antminer S4s contain a critical defect. The customized power supply produced by AplusPower Co. Ltd is suffering from an unacceptably high failure rate and will be replaced with immediate effect.
We take full responsibility for the problems caused and had not anticipated the unique loading conditions of a miner when selecting and testing the suitability of these power supplies. You can read more about the defect in the post below.
We are now taking steps to ensure that customers are impacted as little as possible. The rest of batch 2 S4s will come with the improved power supply as standard.

The following actions are being taken for miners already delivered:
1) If your PSU has already failed:
• Submit a RMA request with some pictures and proof [ie with your username in the photo] of your PSU’s failure to
• We will then ship a new PSU out as soon as possible.
• We will also issue compensation to the value of 10 days of mining profit calculated starting from shipping date
2) If your PSU has not failed and the miner is running normally:
• We will ship a new PSU to you.
• Please do not contact support yet, you will receive an email asking to confirm your shipping.

Analysis of power supply failures within the first batch of Antminer S4s

We are sorry for the inconvenience you may have experienced regarding power supply failures, or even sporadic events of smoke from our first batch of Antminer S4s. We immediately set out to investigate the reports of failed power supplies from customers, and have made immediate changes to improve the quality of future deliveries. What happened with these power supplies is not acceptable.

The power supplies failed by two different mechanisms:

1) Failed TR1 or TR2 MOSFETs on the power factor correction (PFC) circuitry.

After investigations, it was found that the unusual service conditions a miner puts on its power supply was the cause of the failure. The repeated abrupt, dynamic loading generated significant current through the PFC circuits, eventually leading to the failure of the TR1 or TR2 MOSFETs.

The replacement power supplies have significantly upgraded PFC circuits in order to improve performance and prevent a recurrence of the problem.

2) Failed MOSFET on the output Synchronous rectifier circuit

A MOSFET on the output Synchronous rectification circuit was also found to be failing, due to the repeated and sudden load changes during the miners’ operation.

During normal operation, the output MOSFET is expected to carry a current of approximately 30A and operate at a surface temperature of around 80C. The failing MOSFET was found to be heating up significantly further than this, causing the carbonized black PCBs and smoking thermal pad.

It is worth noting that although a failed output MOSFET at high temperatures may result in some smoke from the PCB and thermal pad, it will not start a fire. All internal components of the PSU meet the requirements of the UL94-V0 flame retardancy standard, which certifies that any ignition will self-extinguish within a maximum of 10 seconds.

In response to this problem, the sample filter in the Synchronous rectifier circuits have been altered to erase the excessive current, and so the MOSFET will not fail again. In addition, several high temperature prevention circuits have been added which will better protect the power supply from overloading and excessive temperatures.

Moving forwards

We always perform significant dynamic testing on chosen power supplies, however in this case we failed to recognize the special conditions and specific loading characteristics the miner would place on the power supply. Our testing has been altered to replicate and include these loading characteristics on any power supplies introduced in the future. Once again, we are sorry.

Latest S4 are running without issues, trusted and serious manufacturer. I purchase and received a pair of batch 11 S3+ miners end of october. Fast shipping and quality product. Running full OC and perform 1TH/s+ ( pair ) on Nicehash pool. S3+ are easier to manage power load. They only require 360W-400W each.

Gawminers announce new SHA256 Hashlet Genesis

Gawminers CEO Josh had made another announcement today :

This is from
Gawminers official forum

Hey Everyone!

Funny how you all jumped the gun with a sneak peek on today’s announcement. It’s getting harder to outsmart you guys.

What you saw was an outdated page, so make sure you read on to get the latest details.

But before that, a few quick updates on ZenCloud:

We’ve added credit card purchases back in.
The Hashlet auto purchase option now gives a 5% discount!
Hashlet can now be merged!
You can now see your ranking in the Champions Page!
A bug that incorrectly displayed payouts for some users has been fixed.
Oh, and my upvotes are now worth 100 Hashpoints :grinning:

We’ve also spiced up HashPoints by adding a 20 upvote per day cap in HashTalk :grinning:

Now for the announcement…

First though, a quick recap. You probably have picked up on it by now – Hashlet is transforming our industry. With zero pool fees forever, depreciating hosting costs, exclusive access to the most profitable multipool on earth, and ownership that never expires, Hashlets are the most advanced and future-proof miners in the world.

Hashlet isn’t just our most popular product; it’s the most popular miner in the world and the fastest-selling miner in history.

So for that, I want to congratulate you. You all understand that Digital Cloud Miners are the way forward and you are leading the charge into the future of profitable mining.

HashPoint Widget on HashTalk
I am very excited about this update. As you guys remember, every upvote you give provides that person with a HashPoint! HashPoints can currently be used to purchase more Hashlets, but that will change soon. From the beginning, HashPoints were meant to be a large part of Project Prime! They can never be purchased, they always have to be earned. And very soon, you will see the full power of Hashlets and HashPoints to unlock things you never thought were possible!

In order to help you keep better track of your HashPoints, we have added the HashPoints Widget! It will show up soon on the top right corner of HashTalk so you can see a log of all the HashPoints you have earned!

Keep helping the community, and keep earning HashPoints. You will be glad you did :grinning:.

I would now like to welcome you to the newest addition to the Hashlet family.

Introducing Hashlet Genesis!

Hashlet Genesis is like the Hashlets you already know and love. But there’s one important thing that makes it special. Hashlet Genesis is SHA-256 Compatible!

They start at $9.95 for 10GH bundles, and have a .02 maintenance for for all 10GH!

Oh! And Hashlet Primes are going to be able to switch to SHA-256 at the end of next week. You will be able to switch it between Scypt and SHA on the fly! We will explain how this will work next week :grinning:

So to be clear on Hashlet Genesis’ Features:

0% pool fees, forever.
Gets more efficient as new Hashlets add to the grid.
Costs depreciate over time, keeping ROIs up
Never grows obsolete.
And it’s owned forever, never expiring.

The last bit there is important.

Some of you may have seen that there are a few competitors of ours popping up recently, offering temporary mining contracts to their customers. It’s funny. It’s not just that the contracts are rip off expensive, but there’s a deeper issue at heart. These are the same folks who’ve been caught red handed mining on their customer’s purchased hardware and who constantly delay their customer’s preorders for months on end.

Now they’re proud to sell expensive mining contracts that expire and become worthless?!

And in some cases, they are even using our designs. As they say “if they can’t innovate, then they imitate”

Back to time contracts: How are limited contracts supposed to bring anyone a ROI? One company says they will simply just stop mining for you if the profits become the same price as the payout. What is that? Why not continue to innovate so that does not happen? If the customer wins, you win!

I just wanted to say how happy I am to work with people like you guys, who see through these things and recognize value when they see it.

Because of that, I want to end this announcement with something I shared recently with our Vaultbreaker customers. It belongs to you just as much as it does them:

“To every supplier in this industry:

From this moment forward, the only way to succeed in this industry is to fight tooth and nail for your customer’s ROI.

End of story.

If you cut corners and prioritize anything above meeting your promise to deliver on time and actually give miners a chance to ROI on their equipment (before you do!), then you’re going to see your market share vanish before your eyes. Your customers will flee and take their hard-earned money to a company that deserves it.

Miners have options – you now live in a world where you have to fight to be one of them.

So please, all of you, send that message far and wide and make this clear: The era of false promises and profit mongering by ASIC companies is over.

Hashlet is here. Your move”


Josh, HashKing

New cloud miner Hashlet Genesis