Quote from: Globegains on August 03, 2017, 03:06:42 PM

Hi miners!

This week some nice Scrypt mining ASIC machine landed on my doorstep! Antminer L3+ it is.
I wont repeat manufacturers full spec sheet, but just the key one:

Hash Rate: 504MH/s
Power Consumption: 800W

https://tweezers.tech/antminer_l3+/AntMinerL3Plus_1.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_2.jpg

I wont give you any advice about where and how to buy one of these, but Im very eager to share my experience on how this machine performs.

My setup:

https://tweezers.tech/antminer_l3+/AntMinerL3Plus_10.jpg

Mining pool - AntPool.com SCRYPT
PSU: 1500 W Corsair AX1500i (overkill, but has nice performance reporting tool

Ambient temps in the room were 22C / 72F with ventilation to supply fresh air.

What i wanted to test:
inspect machine build quality;
test power consumption;
test overclocking potential;
find our best settings for long term mining.

Build Quality

I think it is a decent quality machine and keeping in mind this is not a show room item some minor quirks are to be ignored.

Let the pictures tell the story:

https://tweezers.tech/antminer_l3+/AntMinerL3Plus_3.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_4.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_5.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_6.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_7.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_8.jpg
https://tweezers.tech/antminer_l3+/AntMinerL3Plus_9.jpg

Sound Shocked

https://tweezers.tech/antminer_l3+/AntMinerL3Plus_11.jpg

OMG! This unit is definitely not for residential facilities the sound of fans on 100% will drive you nuts

its over 80 db and is comparable to: average factory, freight train (at 15 meters); propeller plane flyover at 1000 ft (88 dB); diesel truck 40 mph at 50 ft (84 dB); diesel train at 45 mph at 100 ft (83 dB). Food blender (88 dB); milling machine (85 dB); garbage disposal (80 dB).

Even at 50% it is very loud. It has resonating sound that is very hard to bear for longer duration. It belongs to miner farms, so apartment miners keep that in mind Wink

Placed on hard surface machine had some vibration because no rubber cushions are installed and its just bare aluminium at contact.

Power consumption and Overclocking potential

This is not a scientific review by any means, but you can get the point of what this machine is capable of.

Stock settings

Machine runs as advertised ~500 MH/s mining SCRYPT coins. ASIC Chips runs at 384MHz and from PSU pulls very reasonable ~730 W. Corsair PSU over Link app is reporting Power in (from the socket): 779W and Power out (to the miner): 736W with calculated efficiency 94%

All 8 PCIe power lines draw 9 -11 Amps.

https://tweezers.tech/antminer_l3+/power_stock.png
https://tweezers.tech/antminer_l3+/asic_stock.png

Why different Amps? because of ASIC chip quality. Some chips have less leak and perform better other draw more Amps.

Overclocking Antminer L3+ to 605 MH/s @ 462 Mhz @ 888 WATTs

Its time to void that warranty

ups I already void it by removing casing screws :/

Anyway I have performed some benchmarking with different chip frequency settings and observed power consumption, hash rates and temps.

Below is the table of different settings and results.

My goal was to achieve +20% hashing rate increase and I did that easily. 600+ MH/s was achieved increasing frequency to 462 Mhz (~+20% from stock settings) and machine pulled 888 WATTS from PSU (~+20% more power draw compared to stock speeds).

https://tweezers.tech/antminer_l3+/power_overclocked.png
https://tweezers.tech/antminer_l3+/asic_overclocked.png

I have seen miners getting 600 MH/s @ 444Mhz, but pulling over 1kW from the socket. This is ASIC chip lottery and those results depend on ASIC quality.

I have contacted Antminer producer to get any advice on long term recommended settings or how far I can go

the answer was very conservative - they dont recommend overclocking, but suggested to observe chip temps. So keep them cool and your Anty L3+ shall be ok.

Anyway Im very happy with results and all coins this machine will mine I will directed to the upcoming real business healthcare appointment booking ICO @ https://tweezers.tech this is very exciting ICO that !DISCLAIMER! Im involved in. if you like this test i performed please visit our ICO site and maybe you will find it interesting and become part of our investor or team crowd!

Check out this table bellow. It shows very clearly that these bad boys ASIC chips scale very nice across all settings:

ASIC, Mhz	Power, W	Hash rate, MH/s
384 Mhz	740 W	502 MH/s
400 Mhz	760 W	523 MH/s
425 Mhz	n.a.	555 MH/s
444 Mhz	850 W	580 MH/s
450 Mhz	860 W	590 MH/s
462 Mhz	888 W	605 MH/s

very useful article, thanks for spelling. can you tell me about the results after a month of work? What is the temperature of the chips?

dmitriy vakulenko

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