(Review/Guide) BW.com BW-L21, 550 Mh/s, 950W Litecoin (scrypt) ASIC miner

[Searing]

Too late for me. I have a D3 coming sept 15th. If they shipped on an order now at
2.5k I'd do it. Not enough time, for the price

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[kurbeks]

Yep grooup buy would be nice. But only if they can ship before Bitmain next batch. otherwise can just contact Bitmain with 100 unit group buy, might even get discount.

[QuintLeo]

Producing costs are actually lower. Wafer itself will cost more, but 16nm will have much more usable chips than 28nm waffer. Although developing costs for 16nm will also be higher. So might be 28nm.

Probably should just ask Bitmain about it, wonder if they will answer.

 14/16nm process costs a LOT more, as the equipment is much lower throughput compared to 28nm and soaks quite a bit more power/labor costs.
 The equipment ITSELF is also A LOT more expen$ive, so it's going to take longer to amortize that cost.

 Wafer cost is a MINOR part of the actual cost of a chip - I doubt it's even 10% of the total overall cost.

 Also, current yield on 14/16nm is still a fair bit lower as a % of the chip than 28nm, though it's high enough you probably DO get more usable chips per wafer.

 

[Khurram Bin Kamal]

Typically chip fabrication cost is the major part of the miner cost and it's cost is fairly standard in the industry for a specific process and as bitmain uses TSMC foundry chips from Taiwan their average cost per wafer is $ 7500 to $ 8000. From the information we get about L3+ specifications we can assume that around 24 to 28 miners can be build from 1 wafer so typically the miner chips cost around 270 $ to 300$. The cortex A8 microprocessor, heat sinks,controller,pcb, fans and casing price is fairly standard if you buy it in bulk it will cost around 150 to 200 $ and according to the batch release date analysis of bitmain it look like they manufacture around 60,000  miners of all types per month so it is assumed that around $ 100 per miner will be their production/Labour cost so if we add all that the total cost is around $600.
The major cost of any miner launch is the development cost of the wafer that is chip designing, tape out, testing etc which is near 10 MILLION US$ but assuming how many miners bitmain have sold it has been recovered in the initial batches. Now according to TSMC foundry website they have now dedicated segment for the development of chips specifically for high computing power.
So in my opinion bw can sell LW21 around $1500 in fact bitmain sold their L3+ for $1291 in June

Disclaimer: All this information is calculated by the data gathered from Google and from technical people and may be incorrect.

[bigjee]

Who gives a f*** what process its made on.
We know how much power it consumes and its performance.
Biggest question is how do we make this possible for people to buy and promote healthy competition to Bitmain.

I wish this wasnt priced so high though (I think the MOQ is less of an issue).


BTW: I looked into this miner some more. The payment model is 50% pay now and 50% paid at time of shipment.
Shipment date is 3 months from date of order. MOQ as stated already is 100 units and $2500/unit.

So yeah this aint getting delivered anytime soon; earliest November. So yeah eff this.

[bitcoindev2014]

how long have you bought it ?

[maiiyeuvo]

I'm gathering people for a group buy, I'm located in EU and would like to purchase at least 10-20 miners.
Anybody interested pls PM me.

Hello,

I am going to check them out, my friend is living in China and going to check them out in HK and their headquater also be in place for shipment. We are going to order at least 100pcs, so if you are interested to buy. You can buy with us also we will add a fee for this.

Will take photo and we can talk in skype also you can be in contact with my friend. Since we are afraid of the delay in production and receiving the item my friend will make his best to make sure everything goes well.

PM if you are interested and we can discuss more.

Cheers

 

[ddd12md]

Very nice review, seems to be a good competitor for the L3+

Wonder how did do 900W @28nm instead of Antminers 800W @16nm...

Really would like to get my hand on some of these

Also send you a PM

PM replied.

I'm pretty sure that BM1485 chip in L3+ is 28nm node process  too.

L3+ is 28nm process. I've asked from Bitmain a couple of month ago.

[Steven3iii]

Sooooo...........can you buy this unit with any cryptocurrency? Or is it just a blind USD send? Is there an English language site at all?

[HagssFIN]

At BW.com web page you can change the language to English by pressing the logo with text "CN" in the up right corner and then selecting English by clicking the US flag.

[Charon12]

I would be up to test the waters if there is a group buy. Granted if it can come by the end of Sept. I have a large order from bitman coming from the late sept batch and would like to  see if these can match their performance.

[Regthaman88]

I would love to get in on a group buy for these, I'll get 5.

[Rabinovitch]

I need 2 pcs in Russia, if any.

[maxmad_x]

I am in for 2 if the delivery date is before the end of Sept.

[Merlig]

I am in for two if the delivery date is in September.

[QuintLeo]

Very nice review, seems to be a good competitor for the L3+

Wonder how did do 900W @28nm instead of Antminers 800W @16nm...

Really would like to get my hand on some of these

Also send you a PM

PM replied.

I'm pretty sure that BM1485 chip in L3+ is 28nm node process  too.

L3+ is 28nm process. I've asked from Bitmain a couple of month ago.

 That's VERY hard to picture given it's performance vs the Titan, A2, and Alcheminer (which were all 28nm as well).
 It's even HARDER to picture vs the A4 (which is specified as 14nm yet has LOWER performance and efficiency as used in the A4 miners).

 I'd bet a LOT that the L3+ is 14/16nm tech.


 The *D3* on the other hand I can believe being a 28nm design, especially with the size of that last batch Bitmain sold of those.

[mindtrip]

I'd be willing to organize that 100 unit minimum order if we can get a few buyers commited in advance

[lenart_o]

I'd be willing to organize that 100 unit minimum order if we can get a few buyers commited in advance

I'm in for 15 units
but I'm from EU
cheers

[Khurram Bin Kamal]

I am in for 10 units

[Khurram Bin Kamal]

Any update on groupbuy