Topic: (Review/Guide) BW.com BW-L21, 550 Mh/s, 950W Litecoin (scrypt) ASIC miner - page 14. (Read 34719 times)

I need 2 pcs in Russia, if any.

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

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.

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.

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?

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

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

 

how long have you bought it ?

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.

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.

 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.

 

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.

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

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.

thanks bro.

Bulletdodger wrote in this another thread https://bitcointalk.org/index.php?topic=1918895.60



You guys really should get together for a group buy and ask some other people too.
I'd bet that there are more people interested buying these.
You could even ask if philipma1957 would be interested in this,
I know that he's looking for more gear at the moment to his expanding solar farm with buysolar.

Just some of my thoughts.


No, I was unable to have it in English.

Yeah it is competitive in power efficiency with the L3+.

I don't unfortunately have a proper dB meter, but I would estimate about 60-65 dB.

Very nice review, good pictures.  Is there a way to change the language for the setup page at all? 

So the power consumption per MHS is roughly in line with the L3+.  Interesting.  Too bad the price is $2500 at a volume of 100 units. 

Did you get a chance to check the sounds levels?  How many DB are coming from these?  Thanks.

Sigh. Need about 10 of these. But no way to get any. Damn this
Review is like a ASIC centerfold. FML

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.

Your argument is invalid, it is actually cheaper to make 28nm node process chips.

Bitmain is not mentioning the node process any where visible. If it was 16nm they would use it in advertising just like they use it a lot in the Antminer S9 advertising.

I tried a lot of Google searching but I was unable to find which process BM1485 is done.