The auction ends.

Phasebird will reply with winners and PM them with payment addresses.

If you did not win, please also stay tuned for the PM, because if some winners do not pay,
the winner list will be adjusted.

Beware!

The PM should be received from Phasebird.

Sorry, 25 hours.

Anyway it's GMT, the same as the time shown in upper-right corner of the forum webpage.

Yes. Same as the forum time.
So only about 24 hours left.

The ending time is 08:00:00 AM, January 25, 2015.

Please help edit the main thread or delete my first and second replies.

starting unit price: 0.3BTC
minimum unit price bidding increase: 0.01BTC
minimum quantity: 20
total quantity: 200
ending time: 08:00:00 AM, January 15, 2015

Block Erupter Prisma2.0 (Prisma) is a major revise over the original Block Erupter Prisma (old Prisma). The 500-Prismas-scale stress testing showed that the devices are running stable without unstability/overheat from which some of the old Prismas suffer. Protection against violent shipping is also added.

Spec and Manual
The specification is similar to the old Prisma, but there are some form factor changes:

size: 36.7cm x 16.4cm x 16.4cm
weight: 7.5kg
hashrate: 1.35TH/s to 1.48TH/s (depending on PSU output voltage and clocking)
power: 1.05kW to 1.25kW (depending on PSU output voltage and clocking)
clock: 230MHz to 260MHz (ranging from 11.5V to 12.5V of different PSU output voltage with full load)

Prisma:


User Guide:
https://drive.google.com/file/d/0B11fvFT7Sd5bWkc5R2Joek9LNjg/view?usp=sharing

Auction Rules
starting unit price: 0.3BTC
minimum unit price bidding increase: 0.01BTC
minimum quantity: 20
total quantity: 200
ending time:

To bid, please reply with the format:

(qty)@(unit price)

For example, if A bids 200@0.2, and B bids 50@0.3, then after the auction ends, A needs to pay 0.2 each for 200-50=150 Prismas, and B needs to pay 0.3 each for 50 Prismas.

After the bidding ends, the winners will be listed. Each winner will be PM'ed with a Bitcoin payment address by forum id Phasebird. If some of the winners do not fulfill the payment request within 24 hours after the PM, the winner list will be renewed by deleting the winners who do not pay and shifting the rest bidders upwards. Then the new winners will also be PM'ed with Bitcoin payment addresses and required to pay within 24 hours after the PM. This process continues until all the Prismas are paid, or the winner list is exhausted.

Shipping, Extra Details and Customer Service
Shipping will be done within 48 hours after payment. Shipping fee is already covered in the price.
Shipping to US is via UPS or DHL by default.
Shipping to EU and other places is via DHL by default.
Please reply the payment request PM with what price you want us to declare, and what shipping
company you would like to choose if you do not like the default choices.

For every 20 Prismas, 5 ethernet controllers and 1 redundant Prisma will be provided. If you need more controllers, please pay 0.069BTC more for each. If you need less controllers, please pay 0.069BTC less for each.

If the number of defected boards is higher than the number of boards on the redundant Prismas, please contact Phasebird by PM or help@bitquan.com by e-mail for shipping back details. We cover free replacement within 180 days after receiving based on records from the shipping company.

Happy bidding!

Price of 120 chip design should be in principle at 230-250 usd w/o the PSU.

If the mid-term future Bitcoin price allows significant quantity, the end-game price can be below 200 usd.

24 chip (6 chip chain x 4) test result posted.
The mosfets and big capacitors are safely removed due to the constant workload of BE300.



Results:

273.60GH/s | 0.38W/G
176.64GH/s | 0.31W/G
155.04GH/s | 0.27W/G
118.56GH/s | 0.26W/G

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

BE200 -- QFN 8x8 or 9x9
BE300S -- FCLGA 5x5
BE300 Final Version -- FCLGA nxn (n not determined yet)

QFN in a low voltage setting introduces too much overhead, so although we wanted compatibility hard, we chose a different package.

The package turns from QFN to Flip-Chip-LGA, which means that
most heat dissipates to the upper side of the chip instead of PCB,
so... not very appropriate to stick to the piple-like heat dissipation
design.

We are waiting for a compilation of data set.

But 7.2GH/s per chip is already achieved, so at least the chain is stable.

The 6-chip chain has passed the test:



The next step is to test the board with fully inhabited 24 chips.

Will do the study. Very interesting.

12V is also not a must. We only need to adjust the chain length.

All mining devices try to draw constant current anyway, so if they try to drive constant current it's also OK.

No data yet. But soon.

Yes. The LDO output for IO and PLL are included as well.

The FETs help balance the voltage. For BE300 we may not include them, but we need experiment to see if it's true.

Confirmed.

The problem is that there may not be widely available high efficiency power bricks.

Competing with 70% efficiency bricks agains professional miners with 92% efficiency PSUs is hard.

The PMS01 IC provides all the functionalities needed except the mosfet for chaining the chip into a string.

For the one-chip board, we still choose to use it instead of a bunch of buffers and LDOs for board simplicity.