We tried hard and we can't. The overhead of QFN-based package is overwhelming. And this time our die
size is much less.

Yes. But in low power mode we think it's possible to make the system without heatsinks
in either side.

The heatsinks in bottom just mainly serves a lifting purpose and meanwhile maybe dissipate
some heat.

The component overhead of USB miners is still a problem.

1 MCU, 1 DCDC, 1 USB-to-UART chip, for each 2 chips, is so much cost to take.

If we make a 8 to 9 chip USB miner (about 40G), DCDC cost can be saved. But USB2.0 does
not have enough watt capability to power it.

Anyone with Prisma1.0 or 1.1 can let us buy back with no specific reason if they choose to.

It's a generic buy-back, not a selective one.

For retail customers/customers get from secondary market:

This time please direct contact us instead of resellers.
The buy-back price for you is 1.39 btc each(0.3475 btc per board), and 0.069 btc per controller.

Till now we received enough returned Prismas to get a statistical conclusion.
We decide that the old Prisma design has some flaws in both firmware and hardware.
Therefore manually fixing them and shipping them back take too long and are
not good for both our customers and us.

So the customers can choose one in the two offerings below:

1. We buy back the Prismas at the original price the customers pay.
The customers only need to ship the controller and the hashing boards back.
The fans and heatsinks are not needed. Customers who already shipped them back
can also switch to this option.

2. We use revised version of Prismas based on our new power management chips
to replace old ones, instead of returning old designs or replacing. This version is very
stable and has no problem of hashrate loss/overheat/can't identify boards/etc.
The compensation method for mining time loss is the same as before.

We cover shipping fee of both, if you can provide the shipping label.

We are very sorry for all the problems brought with the old version Prisma. The revised Prisma with our
own power management chips is much more stable. So if you are still able to put some trust on it and
accept the waiting of compensation (it accumulates with each delayed date anyway), you can choose
the second.

Please email us to sale@bitquan.com with the following information and format:

* Personal info,shipping address,tel number
* Date of buying our Prisma
* Your previous individual/exclusive btc payment address
* Number of broken Prsima boards (have to be fit well with the number you shipped back)
* Date you received your miners,date of shipping back
* The picture of the shipping label with the shipping price on it
* Your btc receivable address. it will be best to be the one you paid to us before. If the btc
receiving address is different, please sign the message with your address used for payment if you could.

For customers who already shipped back, please mail to us again (sale@bitquan.com) about the choice
you want to take.

Phasebird will reply afterwards with the new shipping address within US and EU. It
allows quicker turn-around time.

It's our own string-based power management chip for solving the Prisma-related problems.
The single-chip board is not a string, but we used many of its functionalities anyway to simplify
the PCB design.

One of the problem with Prisma is that it involves too many separate components that might
go wrong. We concentrated them into one chip and only need to test one chip.

The revised Prismas (2.0) are based on this chip. From our large-scale stress testing, we
are confident that the instability and burning problems of original Prisma (1.0 and 1.1) are eliminated.

We achieved 7.2GH/s per chip already, increasing W/G by about 10% compared to 4.8GH/s per chip.

There's a large room for $/GH optimization for mass production, and even if we do not do it, the $/G on 7.2GH/s setting is still decent.

We will see if we can allocate some from the sample batch. The problem with MPW is that we only got
100 chips in hand and we need at least a large part of them for chip-wise variance testing.

There are two reasons contributing to the current RMA problem of BE200-based chain design. The first is firmware problem, which we solved for Prisma 2.0 and are solving for Prisma 1.0 and 1.1. The second is that BE200's load constantly changes when switching task, introducing some big ripples in the whole chain and making the board unstable. It is also largely solved for Prisma 2.0, and is going to be totally eliminated by BE300 since its load never changes.

Also for chained design the output voltage of PSU, instead of software controlled DC/DC, determines your frequency and efficiency. For example, using a 12V-output PSU results in a higher frequency but higher W/G compared to a 11.5V-output PSU.

There are still several ifs for the chained board to achieve this result. Generally we are
positive towards it.

Anyway we will report more data whenever we have new.

We are glad to announce ASICMiner's 4th generation chip. From the physical testing data
of our verification sample, BE300S, the silicon results matches the simulation results faithfully,
and even outperforms our simulation in some cases. BE300S achieved the lowest energy
consumption per gigahash in existing market, getting the joule/gh ratio down below 0.2.

Furthermore, our string-based power solution eliminates almost all power losses and almost
all electric components on the board. Therefore on-wall power consumption would be very close
to (on-chip power/PSU efficiency), and the overall system cost is squeezed to its minimum.

Name: BE300S (Sample)

Technology: TSMC 28nm HPC

Package: FCLGA 5mm x 5mm

On chip efficiency (first board):
    3.0GH/s | 0.1872W/G
    4.8GH/s | 0.2275W/G
    5.2GH/s | 0.2469W/G

On board efficiency (average of 4 boards):
    2.8GH/s | 0.1961W/G
    3.2GH/s | 0.2026W/G
    3.6GH/s | 0.2095W/G
    4.0GH/s | 0.2145W/G
    4.8GH/s | 0.2204W/G
    5.2GH/s | 0.2257W/G
    5.6GH/s | 0.2314W/G
    6.4GH/s | 0.2363W/G
    6.8GH/s | 0.2439W/G
    7.2GH/s | 0.2495W/G

24 chip board efficiency:
    118.56GH/s | 0.26W/G
    155.04GH/s | 0.27W/G
    176.64GH/s | 0.31W/G
    273.60GH/s | 0.38W/G

With more accurate control on the variance between chips we could in principle gain less power consumption in advance.

We are still testing more voltage-frequency combinations, as well as more chips.
But the test results are stable and solid so far.

After the thorough testing of single chip boards, we are going to test boards with chained chips.

Single chip testing board picture:


Testing going on:


24 chips testing board picture:




More data and pictures are to be updated.

Upcoming Dividend Notice

Please expect that there may be a dividend with minimum value which won't be recognized as
dust transactions.

1. As discussed in the board, it serves only the purpose of clearing OTC trades and showing
the founders' shareholding status.

2. Because of 1, please do not take it as a buy/sell indication.

3. The date of resuming dividends with meaningful amount is yet to be determined. It depends
on the upcoming company performance.

AMHash1 is the first of a series of mining contracts.

In this contract, the hashrate is provided by ASICMiner, the management is provided by
RockMiner, and the platform is provided by HavelockInvestments.

For updates please view
http://www.amhash.com/

The purchasing site is
https://www.havelockinvestments.com/order.php?symbol=AMHASH1

The forum contact ID is amhash. The email contact is fund@amhash.com.

Introduction
AMHash1 is a mining Fund which has 5 Peta-hash per second or (5,000,000 Giga-hashes per second) in total.
The Fund is divided into 5 million (5,000,000) s each of which represents 1Gigahash per second.
The price of each unit is 1.25 mBTC (0.00125 BTC).
The contract starts at 18:00:00 in November 4, 2014(Beijing Time, GMT+8).
The time is based on forum time.

Duration for the IPO:
IPO Starting Time: 18:00:00, October 24, 2014(Beijing Time, GMT+8)
IPO Closing Time: 18:00:00, November 4, 2014(Beijing Time, GMT+8)

Advantages
1. Higher ROI; low cost on both initial price and maintenance fee.

2. Flexible trading; the contract is fully tradable at the secondary market through Havelock Investments trading platform allowing you to exit your position at any time.

3. Guaranteed profit; Compared to others, AMHash1 Fund will pay you dividends based on hashrate equivalent calculation protecting your earnings and shielding you from hardware maintenance cost and risk.

5. It simplifies the ROI estimations by eliminating the factors involved in constructing a mining farm, such as infrastructure cost, shipping time, repairing, electricity bill and labor.

6. 100% real hasharate; The live photos of mining farm and hashrate monitor platform will be provided and fully disclosed.

Payout calculation
Payouts are done daily.

The payout rate before fee substraction is 25 / (difficulty * 4.295) BTC per unit per second.

The fee is 1.89*10^(-8) USD per unit per second. It will be substracted from the pre-fee payout rate. The exchange rate is based on bitstamp 24h average.

The total seconds of each payout is:

1. in the first payout, 3,600 * 24.

2. During normal payouts, the number of seconds during the most recent payout to this payout.

If there is a difficulty change between two payouts, the due payout will be calculated based on two different difficulties and their corresponding time intervals.

If the calculated payout after fee substraction is less than or equal to zero, the contract will be suspended. If the number of subsequent days suspended reaches 10, the contract terminates.

Risk control
1. Before IPO closes, ASICMiner has the right to buy back at the price of IPO price * 100.5%.

2. During the first 45 days after IPO closes, ASICMiner has the right to buy back at the price of (IPO price - total payouts) * 120%. The notification period is 3 days.

3. If the delay of payment happens, all unpaid payments will be accounted separately on daily basis and increase by 0.02% per day(flat rate based on the initial unpaid payment amount, no compound rate) after three days.

BE200 was supposed to be <0.2W/GHs because we planned that it has some large room of downvoltage. However most room was
eaten by the mistake we made in chip and package design.

For BE300 in theory it is possible to get lower than 0.225W/GH by stressing the voltage down below 0.55V, but we do not have
solid simulation data yet, so let's see after the test chips are out.

December 16 is to be expected for us to get the chips. Testing time varies at 3-10 days since we had much more preparation work already done this time.

Update

Development
The 28nm BE300 engineering batch tapeout was in September 16 with TSMC.
The power efficiency is 0.225W/G to 0.343W/G ranging from core voltage of 0.55V
to 0.70V. The two main mistakes made in BE200 were dedicatedly addressed and
avoided in the whole design stage so we do not expect surprise in frequency and
power consumption in real products.

14nm/16nm projects are at pre-evaluation and pre-design stage. It has to be done
in 2015 but the starting time of placing orders depends on overall gain vs (NRE/R&D/risks).

Led by Block Erupter Prisma, a series of efforts to reduce component-wise
cost and system-wise power efficiency were made.

Production
As known by OEM producers, several large batches of BE200 had problems with
popping chips affecting whole boards due to the misoperation from the packaging
company. It hindered afterwards chip sales and delayed the starting time of
Tube/Prisma sales. Later supply of BE200 has no such problem and filtering process
on old BE200 is also underway.

Because of the non-open-source status of Prisma and high cost of all other designs, BE200
sales were stopped. Rest BE200 chips will likely be consumed by Prisma and succeeding revises.

The mass production time of BE300 in terms of chip-out date is February to March, 2015.

Operation
As sales were seriously hindered by unexpected yield issue of BE200, we had missed many
dates with financing the big mining farm of our own. It is still hopeful that all good BE200
will be turned to hashrate before too late and we have liquid profits again before BE300, but
from the big picture, the missing of target on BE200, the mis-judgment on OEMs and later
yield/financing problem, limited our expansion and profit in this year. But luckily R&D on later
products is not much affected.

AM will continue to develop new products, expand its mining farms, deliver machines to miners,
as well as make money for shareholders.

There is no any foreseeable plan from AM side on force buy-back, dumping, or any
activities on the open stock market. There is no plan of privatization either. The management,
R&D, sales as well as marketing is being more and more separated and dedicated to professionals,
but the founders will continue to be heavily involved and drive AM in the more and more competitive
market. Scenarios of BE100 vs graphics card may never happen again, but we need catch
any opportunity on timing window of leads at either technology or deploying/financing resources
to win the last battle when mining is still an under-capitalized game.

No, there won't be any stratum problem using cgminer with Raspberry PI.

The fixing of custom ethernet controllers' problem is still under way though.

The cgminer differs from the main branch in only the communication to the device
and some part of the USB driver. Other parts are not modified.

It would also be open source.

Reserved for more information.

Brief
ASICMiner Prisma is based on a proprietary X48 design for BE200. It greatly reduces power
consumption of the device per GH/s compared to the X24 design.

It takes the same cooling structure and similar form factor as the ASICMiner Tube,
while being even more efficient and compact. Also, we added cgminer support on Raspberry PI.

Spec
Hashrate: 350-370GH/s per hashing unit in normal mode, 1400-1480GH/s per full device.

Power consumption: ~0.67 W/G board-wise. On-wall power consumption relies on PSU
efficiency. (typically 1050-1100 W per full device, 0.75-0.78 W/G)

Size: 35cmx12cmx12cm per full device.

Weight: 7.5kg per full device.

Powering: One 6pin PCI-E plugs per hashing unit.

The hashing units are driven by ethernet controllers. It can also be driven by cgminer on Raspberry PI.
Each ethernet controller or Raspberry PI can run up to 32 units.

Round 1 Sales

Shipping date: 8th October, 2014 to 27th October, 2014

Please contact phasebird by PM or sale@bitquan.com by mail for pricing and QTY details.
The price depends on volume, but is <1 BTC/TH guaranteed.

Extra ethernet controllers are 0.069 BTC each. In case you do not need some or all of
the ethernet controllers, you can minus 0.069 BTC each from the total price when buying device sets.

Shipping method inside mainland China is SF Express by default. Shipping fee is paid on receiving by customers.
Shipping method outside mainland China is DHL by default. Shipping fee is 1 BTC per full set.

General Policy
1. Payment before shipping. The shipping order follows the payment order.

2. No refunds after the generation of tracking numbers.

3. If the corresponding tracking number has not been generated, we provide full refund starting from 27th October.
(The nominal refund amount follows the actual payment method, for example, 1 BTC refund for 1 BTC payment, 4k
USD refund for 4k USD payment)

4. Free replacement requirements:
  -- If the user changes components on the boards, we do not offer replacements.
  -- We consider each hashing unit damaged only if it hashes at <300GH/s at 240MHz setting.
     If there are a few dysfunctional chips, but the hashrate is still >=300GH/s at 240MHz, we do not offer replacements.
  -- For other components, the requirement is that they don't function properly.

5. We offer 5% redundancy for the full set orders equal to or larger than 10 sets (100 devices). If the number of damaged units is equal to or smaller than the redundancy number we do not offer replacements. If larger, you need to ship all damaged units back, and we
will offer the replacement units which has the number of (damaged - redundancy).

6. You pay the shipping when receiving. For orders outside mainland China, the shipping fee is 1 BTC per full set (10 full devices).

7. All services from ASICMiner are only available to direct customers (including direct resellers). If you bought them from resellers
or any other secondary market, please contact your seller for services.

8. The official price is transparent and allows no room for any private bargains.

Purchasing Procedure
1. Contact customer service via forum, email, IM or phone.
2. Fill the order details in the form provided by the customer service. (name/address/zip code/phone/email)
3. Pay according to the Bitcoin address given by the customer service.
4. Check for the tracking number when we start shipping.
5. Ask for refunds starting from 27th October if the tracking number has not been generated at that time.

Please make sure you own the private key of your Bitcoin wallet used for payment. It will make refunding much easier.

Contacts
Bitcointalk ID: phasebird
Email: sale@bitquan.com
Customer service: help@bitquan.com
Website: www.iasicminer.com
Customer service QQ IM ID: 1327503207 (overseas)
                                      120045458 & 1327573930 (mainland China)

Please contact only the the methods above. We have not got facebook, linkedin, skype, or any IM groups yet. Beware!