https://siamining.com/addresses/25865daf640696361b432bd517b812270d8459af48f13876108354ee7e028e0e15c13ab5030c

Looks like someone got an early shipment of Halongs. 450 or so of them are live on this address, all with hashrates around 4TH or so. Can't imagine it's any other miner. Here it comes...

https://siamining.com/stats

Considering both Obelisk and Halong Mining are developing Decred miners, I would not be surprised if Bitmain was doing so as well.

Or they might go after the algorithms mineable by the Baikals. Who knows.

I'm using the EVGA SuperNOVA 1600 G2 since I'm on 120v. I don't have too much experience with different PSUs, the only other one I own is a little 650W 80+ Bronze. I will say though that I am very pleased with this thing. It's on the pricey end (I think $400 retail) but has been working great - not a single issue, relatively easy to set up. I'm also overclocked to 681 so she's pulling ~1520W at the wall. The ONLY complaint I have about it is that the plug from the wall to the PSU fits kind of loose in the PSU. Doesn't clip in, and wiggles around a lot. If you don't move the PSU it's no problem, but it has come unplugged in the past when I was moving my setup around.

Yes, difficulty would go down since in theory the A3's which currently account for probably 80%+ of the total hashrate would be rendered useless. The Sia devs considered doing a fork to kill the Bitmain ASIC. They argued that Bitmain's ASIC was going against decentralization of the coin and was bad for the ecosystem. Think what you will about Bitmain (and I agree that it was shady to release the miner in the surprise manner they did) but it's insanely hypocritical to say "their ASIC is bad, but our ASIC is good". So ultimately they decided against the fork.

You can't favor some ASICs over others, in my opinion. You have to either support all ASICs or no ASICs. Look at Monero - they are making their coin ASIC-resistant by building in slight alterations to the hashing algorithm over time that make it impossible to build an ASIC for.

Every time a new batch of miners hits the market, the difficulty increases and the profitability goes down. It depends on how much total hashing power is added, which is tough to guess because we don't know how many units are sold in each batch.

The difficulty spiked from around 1Ph/s to over 10Ph/s when the first batch of A3's hit the week of 1/26.

The difficulty will spike again when the next batch of A3's hits, but it's unclear by how much because we don't know how many units were sold. I would guess we're going to double hashrate again and halve profitability.

The next big uptick in hashrates are going to be based on the following events (depending on when they happen):

a) if Bitmain makes a batch 3
b) if Halong Mining actually ships their 3+TH/s miner they claim to have
c) when the SC1 ships (not sure when that is, you say June but all I've seen is "before August 31".

-glosed

Update, just switched back to SiaMining. Ended up giving it almost a whole week (~6.4 days) but ended up averaging only 1,409 SC/day on Luxor (and I'm overclocked at 681, hashing average 940GH/s in Antminer UI). They had a day or two with solid luck and enjoyed that payout, but there has been much more bad luck than good. Maybe I'm too impatient to handle 10+ hour timeframes with 0 blocks found but that's a bit tough to stomach when there's a month left before the second batch ships and profitability tanks. They did mention that along with their "24-hour ramp-on" that there is also some sort of ramp-off where I get paid for 24hr after stopping, so I will update this post's figures with the additional revenue (if they find another block  )

I was netting 1,900 SC/day on SiaMining before I switched over, the diff has of course gone up so I'll also see what I end up back at once I've been live for a day or two.

If you underclock to 575 your HW errors will practically vanish.

I ran some tests, posted here: https://bitcointalk.org/index.php?topic=2881452.0. I'm sticking to 681 as I'm taking advantage of cool ambient temps (miner next to an open window) and my HW error rate is a bit lower than it was when I tested.

I've been mining in SiaMining, but switched over to Luxor today to give it a shot now that their luck has been improving... I'm going to give it a few days before making the call on switching back.

-glosed

There's been a decent amount of speculation as to why Bitmain is selling batch 2 at such low prices. Look at what Halong Mining claims*** to do (they still have not shipped a single unit of their SHA256 miner to date so this is very TBD) with a miner that can hash SHA256 at 16TH/s, slightly higher than the S9. If they are now claiming that they have a Sia miner at 3.5TH, I would not be surprised if Bitmain has an "A3+", "A5", whatever you want to call it around the corner. I don't think Bitmain is dumping stock because of the SC1, I don't think they're dumping because of the B52... I think they've been able to massively iterate over their first Blake2b miner and are going to crank the game up a few notches here soon.

Holy hashrate, Bitmain!

https://i.imgur.com/gOl1xAx.png

Improve your cooling on it or underclock it. Not sure if underclocking will void your warranty, or if only overclocking it will... Proceed with caution. When I underclocked mine to 575 I saw a drop in temps of over 4 degrees: http://bitcointalk.org/index.php?topic=2881452

Perfect! Thank you, will check it out. Glad I'm not going crazy.

Hi all,

Finally got my Kill A Watt in the mail, so I tinkered around with overclocking my A3 to find an optimal frequency setting. Results below, I hope this helps!

Setup

Miner: Antminer A3 815GH/s
PSU: EVGA SuperNOVA 1600 G2
Circuit: 120v, 20A dedicated
Environment:Intake fan resting at open window, weather around 40F


Methodology

Pretty straightforward...

• Adjust the frequency setting on the Antminer
• Let the Antminer run for 5-7 minutes
• Once stable, record the data
• If a test seems like an outlier, re-test that frequency later to confirm (No results ended up changing, initial results were confirmed)

Results


Seems like the sweet spot is around 662-681. Not sure if I feel comfortable running at nearly 1% HW Error Rate, despite the increase in Hashrate. Comments/Opinions? Probably shouldn't have even attempted the 712 test after what the 700 looked like... I did test lower frequencies after and am getting good HW rates so it seems to not have done serious damage to the machine.

I did not factor in the effect of increasing power draw, as I am in a lucky situation where electricity is included in my rent (and depending on what your $/kWh costs are, results may vary).

Here's my best explanation (which might not be accurate so someone please let me know).

There are three main differentiators between Bicoin's difficulty algorithm and Sia's that are at play here (there are more differences, but these seem to be the most important):

1. Difficulty adjusts every block, rather than every 2016 blocks (~2 weeks).
2. Difficulty adjustments are limited to 0.4% per block, while Bitcoin's adjustment is unbounded.
3. Rather than adjusting difficulty to meet the targeted blocktime on a go-forward basis, Sia looks at time since genesis and adjusts blocktimes to get back on track.

https://www.reddit.com/r/siacoin/comments/7rz606/update_on_the_block_139000_hardfork/

The above post explains it much better than I could, but in the context of the A3's hitting the network:

1. A3's start going online and the hashrate increases much faster than the difficulty can adjust for.
2. Difficulty increases, and continues to increase, even after hashrate flattens out to slow down block generation until we are in line with where we should be relative to genesis.
3. Once we are closer to aligning actual block solves to when they should be happening, difficulty starts to adjust back down so we don't overshoot and fall behind schedule.

Thanks for that intel. Happened again to me this morning, right around 8am I was woken up by the fan speeds ramping to 100%. I just Save&Applied miner config to reset the machine, and when I did I was getting HW out the wazoo - over 100% on board 2, which to date has been the board that typically reports the least HW. Lots of x among the o's, and board 1 wasn't even hashing at 100GH/s. I tried another time and the same thing happened, which was strange because usually it's easy to fix. So I turned my unit off to go back to sleep for a bit and deal with it later. Woke up a couple hours later, fired it up, and she;'s cruising along just fine.

I'm glad that the issue is temporarily fixable, what I'm more concerned about is, what if this happens when I'm not at my apartment to make sure it's not running on big HW for hours on end?

Has anyone attempted to host on Sia? Lots of buzz/drama around mining it since Bitmain just shipped an ASIC for it, but I haven't heard anything about profiting via hosting. I'm unfamiliar with Storj and Burst (have only heard of them) but have at least poked around the Sia client.

It looks like for Sia you could probably net just under $4/TB/month. Would be interesting to see how Storj and Burst stack up on a $/TB/month basis.

Poking around Newegg it looks like the best you're going to get for storage space is around $40/TB, so ROI just over 10 months.

I was not overclocked. My HW rate typically fluctuates between 0.01% and 0.1%, but 3% is quite large. I feel like something may have happened to a lot of Antminers... my File System and Kernel versions are both from December, but it seems a bit odd that a big spike in my fanspeed and HW rate would occur at the precise moment there is a very noticeable dip in hash rates across SiaMining and F2Pool. Maybe it is coincidence... as greyday advised, I'm going to forget it, because it's Chinatown 

Default 600 with temps on the lower end. I Save+Applied my miner config to reset the Miner Status page and everything seems to be back to normal. Now I'm just wondering what the hiccup was... oh well.

Followup, it seems to be a network issue, as many of the top addresses on SiaMining, Luxor, and F2Pool all show the same hashrate dip...

Are HW errors at all related to the pool you are mining from? My hunch is no... but I was sitting in the other room and my miner shot up to 100% fan speed for no reason (when I checked the miner status PCB/Chip temps were like 30/40 so that wasn't the cause). But my error rate was nearly 3% which is way above what it has been to date (read: the 22 hours or so it's been running).

Also, it looks like there's something up with SiaMining, wondering if that could be the cause of the fan speed? Pool hashrate dropped like a rock. I figured it could be due to some miners going to AntPool, since https://siastats.info/mining_pools.html shows about 300TH/s that I don't think was there before. But then I noticed my own hashrate had gone down. To rule out that being the result of me getting a spike in HW errors or something else happening like it resetting and spiking the fanspeed, all/many of the addresses here: https://siamining.com/addresses are also getting cut in half...as if I needed a reason to switch back to Luxor, it does seem like their luck issues are getting better.
 
https://i.imgur.com/jJFgYJN.png