Topic: Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v15.0 (Windows/Linux) - page 1305. (Read 6590565 times)

I fail to see how the type or brand of mother board can matter when using 2 psu, I have asrock z87 mboard and use https://www.pccasegear.com/products/24241/phobya-24pin-2-way-psu-starting-cable this cable to start both psu. I have 5 gpu 1000w + 850w psu, the 1000w runs the mboard + accessories and 3 gpu and powered risers, the 850w runs 2 gpu and their powered risers.

Thats what u get if u choose solo. If u dont like to deal with probability then pool mining is ur way.

I've read all, and all I found was that both PSU must be grounded together. But for me that is obvious: if no connection between grounds - you may definitely fry the motherboard and/or something else. Also one should use powered risers or connect both extra on-board Molex connectors to a PSU to provide more power to 6 GPUs.

To be on topic: @Claymore, any progress with stability of stats fetching on Linux? 4.3 works well for me but even pressing "s" once gave me assertion failure. Also automatic refresh wia EthMan causes this often. I set the miner as offline and update stats only when necessary.

I run powered Risers i forgot to add.  Maybe that is your issue.

Imagine the following situation: my hashrate is such that I must find 1 block per day. POW finishes in 10 days. In days 1 to 9 I find only 1 block. Extreme bad luck but, can't it be? Then probability will make me find 9 blocks in last day? No. In day 10 POW is finished and I'm f#*% up. What is wrong in this?

https://bitcointalksearch.org/topic/m.5937364

but below somone sais he got it to work. so im not sure and i went too far by saying it doesnt work xD
my experience, i have 3 h81 but only tried to install one of them the whole day..
with more than 4 gpus i always got a black boot screen, system hangs, not even numlock works
i tried all other 5 hdmi ports more than once, no screen,
so i changed rises with same results.
now when i removed a gpu the system booted.. i was happy at least 4 gpus installed
but mining crashed after a couple of seconds with system hang and gpu vents not working.
i googled and found the link above...
@ the h61 i installed everything and 5 gpu work no problem, with 2 psu. 6th is a little tricky
however, with 3 gpu and only one 750w gpu @h81 i have no problem. but thats not what i had hoped for when considering the h81 over the h61 ...
i maybe try to bios update and options tomorrow but i really dont wanna fry it, i would rather change it for a h61



yeah ive read the h81 need a bigger psu to work, and the need to be on the same ground.
so yes, with the right settup it might work well.. 2x 750w psu, no luck for me :/

Thanks man !

I have 13 Miners all with that board all with dual power supplies.  It works like a champ!  I have a 1300 that runs 5 cards and a 500 that runs 1 card and the accessories, mb etc the 500 Watt pulls 392 watts dual mining on R9 380 4gb

Can you explain this in details, I am going to use one server PSU for cards and one PC PSU for H81 BTC Pro just bought. Any issues?

A pool has huge hashrate comparing to one miner, the law of large numbers works here (https://en.wikipedia.org/wiki/Law_of_large_numbers). That means less variance in a number of shares found by pool. It finds them so many per hour so you don't see any luck. But mining solo, if your hashrate is little, you may find many blocks in a day and them find nothing in a week.

Also, say, DwarfPool uses HBPPS (hour-based pay per share). It gets some Ethers for an hour, then calcluates number of shares submitted in this hour, and distributes Ethers proportionally to shares of each miner. Payment depends on (1) percent of shares submitted by you (based on total shares per hour and your shares) and (2) number of blocks found (and payments for them).

Ethermine uses PPLNS (pay per last N shares). It calculates moving average of your shares in last hour (60 minutes) and uses this average to distribute Ethers from every block. Since it uses average, your payments are instant (calculated after every block, not in the end of an hour), so you see a smooth stream of payments after the 1st block found since you started. Again, it works for large numbers (hashrates), for small ones you will see how the luck is involved.

first of, great miner, i love it

ive tried it with shift and expanse but it didnt work maybe you can add it

today ive run into a problem and im not sure if its app related.
i hope someone here had an idea since google isnt a big help. (ill the search the forums next)

i ran the dual miner for several days on a 5 gpu rig.
no problems.
today i tried to install a 6th GPU, after some minor problems (always check your cable connections twice at least^^)
i managed to get all 6 gpus to show up in my linux terminal.

but when i run ethdcrminer64 it stops right after discovering the pools,
right befor checking the gpus and quits with a german error message
sorry i have no log right now.. i stopped working for today ^^
and by now i forgot the real message xD but it was something "speicher zugriffs fehler, schreibe in datei"
-> memory access failure (writing to file)

ill edit this later with the real error log.


what i didnt do:
i didnt run the env variables:
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
setx CL_DEVICE_MAX_MEM_ALLOC_SIZE 2147483648

maybe max_mem_alloc could have fixxed it.
its too late to try today.
maybe the error is something different and i need some help to figure it out.

rig data:
asrock h61 btc pro
6x r9 380x
8gb ram
usb3 riser
2x 750w quality psu

i also suspect it could have something to do with power..

fyi, asrock h81 btc pro doesnt work with 2 psu (another problem miner argh)
i hope someone has an idea what may cause the trouble and that its only env variables xD, thanks

Ok, I will improve code so you will be able to see temperature if you specified "-tt 1".

Your point of view is wrong but it seems it's a complex task to prove that to you. I will try one more time.
For example, you mine for one hour with some hashrate. Within this time there is some probability to find a block.
After that, you mine for 59 minutes with the same hashrate. Will you agree that the probability to find a block now is less by 1/60? If you agree, you must also agree that 1% devfee time reduces probabilty to find a block within any time with any hashrate by 1%.
If you don't agree, it means that you think that 1% of time means more than 0.01 of 100% time - I can advice you to read some book about probability theory. Before that, don't even reboot your rig because you will lose all blocks because of missed 1 minute of mining

Just wondering can it be more profitable to solo mine. I have been mining on ethermine.org but its a set payout. It doesnt seem like luck is involved at all. Im still rather new to mining but can someone explain. I have about 260mh so im not sure solo would benefit me either.

You're right about threshold hashrate for solo-mining, with very small hashrate and fast difficulty rise. But wrong that it is affected by CDM for more than devfee time percentage.

Second is here . Same situation, banch of cards without default cooling.

Thanks for the clarification and sorry for my misunderstanding. Please read the comment to jstefanop's post.

It is because miner drops any temp/fan related actions if there is any error because it can cause problems in further calculations, for example, miner must know fan speed if you specified temperature management, or if remote control asked it.
It is possible to implement more complex logic, but currently you are the first person that shows me this error. I'm curious about your hardware and cooling.

In the theory it is the only thing that matters but I think there are other things to consider aside from theory.

Let's think about a possible scenario: I mine solo with my 300 mh/s and I should hit one block every 1.5 days. If 1.5 days pass and I didn't hit a block, then I can say I missed a block. This can be due to dev time or just to bad luck, let's say it is due to dev time. Then I need to find a block "within time" the next 99, on average. This means that, if everything goes on average, after 150 days my figures will be correct. What if, by chance, I miss 2 blocks due to dev fee? Then I need luckier times or I will go to 300 days to even out.

When the hashrate is so little as mine, it is possible that you need a lot of time for your figures to even out if you had bad luck. And POW is not forever. Is this a correct thought?

If it is not a wrong thought, then there is a hashrate threshold below which it is dangerous to solo mine with CDM because you risk to not even out in case of bad luck. And then for the real mining, not the theory, probability is not only thing to take into account. Please I insist, I am not a math guy, correct me.

@Claymore

my cards running without fan attached , so i get error


which is fine. But it seems that this error breaks the temperature read out. Always get zero temperature.