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1  Alternate cryptocurrencies / Mining (Altcoins) / Avalon 741 losing hash rate? on: December 28, 2017, 09:30:53 PM

I have four Avalon 741's and whenever I mine something other than BTC/BCH they basically just mine at 2/3 their speed.

I'm going to assume that it might be because of rejected shares (I get lots when I don't mine BTC/BCH) but if that's the case, is there something I can do to remedy that?

I've already tried to increase the difficulty, in case that was the issue, but it didn't help.

Any ideas? Do you need any info from me?

2  Bitcoin / Mining support / Avalon 741 suddenly isn't seen by controller on: December 13, 2017, 06:55:40 PM

A friend of mine just bought two Avalon 741's along with a Raspberry Pi and PSU. They were bought from an official redistributor.

They're connected in a small "chain", as in Controller > AUC3 > Miner > Miner. They've been working for two days but today I rebooted them remotely. The miners never came back on.

The controller can't find any devices. The controller itself seems to work just fine though, settings are saved etc. It just can't find any of the miners connected.

This is what we've tried:
Cutting and restoring power to the PSU's and controller.
Changing all the cables.
Changing PSU.
Changing AUC3.
Connecting only one miner (tried both on their own).
Flashing new firmware (not Controller firmware because he doesn't have a card reader).
Restoring settings from my backup.

Light on AUC3 is green and blue, and light on both miners are green. We live in Sweden so we're using 220V.

Any ideas are appreciated! Thank you!

Edit: The CGminer API log says this:
[Firmware Version] => Avalon Firmware - 20170603
luci: ffc1d59
cgminer: 2354004
cgminer-packages: d309c69
Socket connect failed => Connection refused
3  Alternate cryptocurrencies / Mining (Altcoins) / Titan Xp hashrates? on: November 20, 2017, 12:39:47 PM

I was wondering what the current up-to-date hashrates are for Titan Xp on as many algorithms as possible? I can't seem to find a good source with up to date hashrates. Nicehash doesn't even have it and lists old hashrates that doesn't seem right at all. For example, lists the fastest lyra2v2 hashrate at 67MH/s, which surely can't be right when a single 1080 Ti hashes at over 70MH/s.

4  Alternate cryptocurrencies / Mining (Altcoins) / How is power distributed between GPU and riser? on: November 11, 2017, 04:01:54 PM

Does anyone know how power is being distributed between GPU and riser?

Let's say a GTX 1080 Ti uses 250W at stock. How much of that power goes through the riser? If I lower the power limit to 50%, will the riser use 50% less power as well or will the riser always use the same power while only the power through the connectors to the GPU get lowered? How is the power divided among riser and pin connectors?

5  Economy / Computer hardware / [WTS][EU] Baikal Giant A900 [SOLD] on: October 06, 2017, 09:40:23 PM
Hello everyone,

I'd like to sell my Baikal Giant A900 if someone is interested. I'd prefer to send it within Europe due to shipping costs, but am open to suggestions.

I'm not sure what the correct price would be, so I'm going to let people reply with whatever they feel it's worth.

Note that the average hash speed for X11 is 917MH/s and both Qubit and Quark is 915MH/s. I purchased the Giant in mid-March and has been working great. PSU is not included and would increase weight so much that it's probably cheaper for you to purchase one yourself.

Algorithm : X11 / X13 / X14 / X15 / Quark / Qubit
Hash Rate : 900MH/s(10%)
Input Power : ATX Power,12V Plug 6P/8P
Interface : 1 x Ethernet
Operation Temp : 0 ~ 40 ℃
Dimension : 300mm(L) x 123mm(W) x 123mm(H)
Weight : 2550g
1. Hash Rate and Power
Giant-A900 miner
1) X11 : 900MH/s @ 217W
2) X13 : 900MH/s @ 255W
3) X14 : 900MH/s @ 263W
4) X15 : 900MH/s @ 270W
5) Quark : 900MH/s @ 132W
6) Qubit : 900MH/s @ 146W

Edit: I've received an offer for 0.26 BTC.

Edit: The item has been sold.
6  Alternate cryptocurrencies / Mining (Altcoins) / sgminer can't find GPUs (AMD) on: September 28, 2017, 10:00:23 PM
So I've been trying to get sgminer to work with my RX570 cards. Unfortunately it doesn't and apparently can't find any of my cards.

Note that my cards work fine with any other miner I throw at them. They are all found in device manager. They are all working. None of them has that yellow triangle. Simply put - the GPU's work.

When I try to start the miner I get the following error:
[23:52:28] clDevicesNum returned error, no GPUs usable
[23:52:28] 0 GPU devices max detected

If starting using --ndevs I get the following:
[23:52:28] CL Platform vendor: Intel(R) Corporation
[23:52:28] CL Platform name: Intel(R) OpenCL
[23:52:28] CL Platform version: OpenCL 2.0
[23:52:28] Error -1: Getting Device IDs (num)
[23:52:28] clDevicesNum returned error, no GPUs usable
[23:52:28] 0 GPU devices max detected

I've tried both the (as of writing) latest blockchain drivers from AMD but also the latest "regular" drivers (17.9.3).

Any ideas? Thanks!

Edit 1: I've tried --gpu-platform 1 and it made no difference. Probably because sgminer can't find my GPU's for some reason.
Edit 2: I've also tried sgminer 5.3.4 and 5.5.5 with the same results and error messages.
7  Bitcoin / Mining speculation / How is difficulty relevant when you know your percentage of your net hashrate? on: July 19, 2017, 11:15:16 PM
Hello everyone,

I've been looking into difficulty and its impact on how quickly one can find a block when solo mining. However, I'm having a hard time understanding what the difficulty actually means and what it is for.

Let's say I know the difficulty of a given coin. I also know the average time to find a block. I also know the total net hashrate and of course my own hashrate.

And let's also say that I know that I have 10% of the current hashrate, I'm assuming that I'll on average find 10% of the blocks per day.

What good indication is the difficulty of the coin then? I'm assuming that if I have 10% of the total net hashrate, I'll find 10% of the blocks. The difficulty seems irrelevant to me as long as I know what percentage I have of the total network hashrate.  

I'm sure I'm missing something very important here, so please enlighten me!

Thank you!
8  Alternate cryptocurrencies / Mining (Altcoins) / Most power hungry algorithms for Nvidia? on: July 06, 2017, 01:11:57 AM

Basically, the topic says it all. Which are the most power hungry algorithms for Nvidia cards? Is there anywhere I can see which ones require more power than others - without testing myself?

9  Alternate cryptocurrencies / Mining (Altcoins) / Where to purchase cases from EU? on: July 04, 2017, 08:40:55 PM

Does anyone know of any reputable supplier of cases from the EU? I know the US has a couple (that I know of) but the shipping cost is extremely high due to the heavy weight.

I've purchased 12 cases from, however, there's a lot of missing pieces so out of those 12 I can only build 6 of them. I've of course contacted them but haven't heard anything for two weeks and the only reply I got two weeks ago was basically "sorry, new people, will send asap" (which I assume they blamed new employees or something).

I also know of but their case won't work for me. Partly because it's not stackable and partly because it looks like crap.

We really need some new proper cases because we've got a lot of rigs on the floor and on tables right now.

10  Alternate cryptocurrencies / Mining (Altcoins) / Mix riser power from different PSU's? on: June 05, 2017, 07:15:08 PM

If I buy EVGA G2 650 to power the motherboard and 2x risers and also buy a 2400W server PSU to power all GPU's and 4x risers, will there be a problem?

Can I mix powering the risers from two different PSU's or do I need to power them from the same PSU?

If I need to power them all from the same PSU, can I power them using the small PSU (motherboard and risers) or do they need to be powered from the same PSU as the GPU's?

Thank you
11  Alternate cryptocurrencies / Mining (Altcoins) / Would you recommend a regular PSU per rig or server PSU? on: June 02, 2017, 04:14:13 PM

I've ordered components for five rigs with 6x RX 570 cards. In a few weeks, I'll be ordering another 10 but might go with Nvidia instead depending on the market. I'm planning on at least another 20 after that within a few months.

Would you recommend a single powerful PSU for each rig or would you rather go with a smaller PSU for motherboard and risers and then a server PSU to power the GPU's? Perhaps a single powerful server PSU for two rigs, depending on the rig?

With AMD cards, I'm looking at around 1000W per rig but was thinking of doing 6x GTX 1080 Ti's in a couple for around 1500W each (not sure about this number though, just going off of what the manufacturer claims).
12  Alternate cryptocurrencies / Mining (Altcoins) / How much data traffic when mining? on: June 01, 2017, 11:45:32 AM

I've ordered 30 GPU's to fit in 5 mining rigs and another 60 (for 10 rigs) within the next two weeks and hopefully expanding with another 240 GPU's within a few months. Electricity isn't a problem but bandwidth and data traffic is, at least temporary. Does anyone have an estimate of how much traffic a single mining rig with 6 GPU's and dual mining would use?

As a temporary solution I've thought about is using a 4G router until we've gotten a phone line to the warehouse for a couple of months.

13  Alternate cryptocurrencies / Mining (Altcoins) / Two 470, one at 27MH/s, other stuck at 23MH/s? on: May 30, 2017, 12:05:14 PM

I have two Asus RX 470 4GB in my daughter's PC. They are the same model and I've flashed the same BIOS to them both.

However, one of them refuses to go past 23MH/s. It doesn't matter which settings I use in Claymore or Afterburner, it just doesn't. It's also stuck at the same 55c temperature while the other is at 65c (it's hot in her room and not so good cooling). No matter what I do it's stuck. The other hashes at just above 27MH/s.

I've tried increasing the page file, I've tried changing power limit, memory timings and memory clock. It's the exact same speed at 1650MHz memory clock as it is at 1950MHz. I've also messed around with the -dcri setting.

Any ideas? Thank you!
14  Alternate cryptocurrencies / Mining (Altcoins) / Temporarily using a 007S risers to power GPU's until 006C arrives? on: May 26, 2017, 11:18:40 AM

I'm waiting for my 006C risers to arrive but have a lot of new 007S risers lying around (not from this seller but this kind:

Would it be possible to use them for about a week until the others arrive? Of course, I would be using a single SATA cable to power each riser. The PSU is an EVGA G2 1300W.

I'd be running 6 Sapphire RX 570 Pulse Mini. The specs claim that it will use <150W (one 6 pin) but I could of course under volt it to use even less.

Thank you for your input.
15  Alternate cryptocurrencies / Mining (Altcoins) / Which GPU is best when it comes to price compared to hash/W? on: May 24, 2017, 08:50:35 PM

A friend of mine and I are looking to invest into mining and I'm wondering if anyone has any hard numbers on the best GPU for both camps (both Nvidia and AMD) when it comes to price of the card and compared to hash/watt?

We're thinking of getting a couple of rigs with 6x Nvidia GTX 1080 Ti but we're not sure if that's the best card to pick. Since our biggest problem is total wattage, it's important that the hash/watt is as high as possible, but we also have to take the initial price into consideration of course.

For example, philipma1957 tried the GTX 1070 Katana and had (unless he's gotten better numbers) 3.83 hash/watt. But his 1080 Ti had 4.0 hash/watt. It had twice the power usage but it's not twice as expensive, which makes it even better than the Katana.

Does anyone else have some hard numbers on their card when it comes to price/hash/watt?

Thank you in advance!
16  Alternate cryptocurrencies / Mining (Altcoins) / Regarding risers and PSU cables on: May 24, 2017, 05:18:31 PM

I'm going to order 8 or so risers (will only use 6 GPU's but wanted two extra spares just in case) but I'm not quite sure what to pick. I've also got a question for you experienced miners regarding PSU cables for the risers. So here goes.

Should I order risers with 6-pin connectors? If so, can I power 1 GPU and 1 riser with the same cable from the PSU? If not, then the cables on the PSU won't be enough.

Or should I order risers with molex connectors? If so, can I power two risers with one cable from the PSU? Also, the EVGA G2 1300 that I've purchased only have two cables with molex, would it be possible to take another one from my EVGA G2 750 that I'm not using? I'm assuming it's the same cables. Can I plug the third molex cable (on the PSU side) into one of the ones that are supposed to be for the sata cables (there are only two peripheral slots on the PSU)?

Thank you!
17  Alternate cryptocurrencies / Mining (Altcoins) / Not plug in cable on powered risers when using molex connections on MB? on: May 23, 2017, 02:55:14 PM
Hello everyone,

I've bought these cheap looking risers while waiting for more quality risers, just so I can start mining faster.

However, I'm wondering if I really should plug them in with molex cables when the AsRock BTC R2 already have extra molex connections on the motherboard? I've read people both saying you should use both but also read people saying that you don't need powered risers with that motherboard as long as the molex's are connected to the motherboard.

This is what I purchased:

18  Alternate cryptocurrencies / Mining (Altcoins) / Buy case from EU? on: May 20, 2017, 05:02:10 PM

I'm in need of an open air case for mining. The only one I've found in Europe is from However, they take weeks to deliver within Europe and only have a single super basic model

The other places I've found ship from the US, which increases the shipping cost and time significantly. Of course, Ebay and the China/Hong Kong sellers isn't an option since I could be waiting for up to over a month.

19  Alternate cryptocurrencies / Mining (Altcoins) / Which single PSU is best for 6x RX 570 and dual mining on: May 20, 2017, 09:13:27 AM
Hello everyone!

I'm building a dedicated mining rig and am wondering which PSU would be best for six RX 570 when dual mining? I was thinking a Corsair HX1200 but that might be pushing it? If not, what would you recommend instead?

I'd also take this opportunity to ask if there's any big difference in mining speed between the Sapphire RX 570 Pulse, Gigabyte RX 570 Gaming and the Sapphire RX 570 Pulse Mini (one fan)?

20  Alternate cryptocurrencies / Mining (Altcoins) / Can I use a x1 to x16 riser in a x16 port? on: May 19, 2017, 09:55:15 PM

Can I use a x1 to x16 riser in the x16 ports or do I need specific x16 to x16 risers for that?

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