rig turns off after ~15minutes

[-ck]

bitcoin mining over intensity 9 is wrong

[Bitsaurus]

Most likely a power issue as mentioned.  If you put a Kill-a-watt on it and start mining you'll notice the power draws goes up until the temps reach a steady state.  Probably when the rig shuts off it is overextending itself.  Either take a card out, undervolt or downclock one card to reduce the load.  Maybe downclock the hottest card.

[tom_o]

Most likely a power issue as mentioned.  If you put a Kill-a-watt on it and start mining you'll notice the power draws goes up until the temps reach a steady state.  Probably when the rig shuts off it is overextending itself.  Either take a card out, undervolt or downclock one card to reduce the load.  Maybe downclock the hottest card.

Or underclock the CPU, that's what I did. If it isn't your main pc you could even disable one of the cores reducing draw even more!

[p4xil]

flash your cards to F43 bios
It will lower voltage to 1.09... and save you around 40W per card.
Here is the tutorial:
https://bitcointalk.org/index.php?topic=197200.0

[007158]

Mining litecoin with 3 gpus pulls about 1k from wall(bitcoin is about 900w), something must be wrong?
Beside gpus i have cpu, ram, ssd, usb wireless.
Solid psu if it wokred for 10 minutes with one more gpu i guess

Would prefer not to flash bios due to warranty.

[-ck]

Yep, you're just out of power. Mine the real coin at lower power and be happy.

[007158]

Still won't be able to use 4 gpus and i have 4, i'll try to return the psu and just get a bigger one and then figure out max performance.

[007158]

Flashed to f43, looks a lot better now. Had some problem with no video on booting, only could run 2 cards at once and not in any combination... but did this finally. Clocks are 1000/1250 tho not 900/1250 but voltage is 1.09, autofan works fine at about 500rpm less to keep target, hash is more or less the same - 600 on litecoin. Most important thing, it takes 800w from wall so significant drop. Maybe i can get the 4th gpu going, pretty sure it'll be fine for bitcoin

edit: power draw for bitcoin at 1100/750 770w about 560mh/s fluctuates a lot unlike previous bios where it was very steady in cgminer, also there is difference between cards and before there wasn't bu i guess it's a lot bettter now


edit 2: Could some moderator please move it to mining support, i wated to start it there but something went wrong.

I got the 4th card in but cgminer starts with it being at 500/100 even when i specified engine and memclock for each card seperately, when i disconnected on of proprly working cards this one starts to work fine(1100/750). Can it be that it lacks power and acts this way(before it just turned off so dunno)? Its connected to a rail with mb(2x pci-e not powered, proc, ram and other stuff), non modular so can't really change much besides powering 2 more risers. Also i can't change engine and memclock in cgminer it's fixed ant this 500/100 or 500/150 for litecoin.

[Aureum_Coffee]

Same thing happened to me.  2x "Gigabite" 7970 with 750 Watts OCZ power supply.

Shut down after both cards came online to mine with GUI miner.  Upgraded to a 950 Watt PSU, problem solved.

[MrBilling]

See my thread https://bitcointalk.org/index.php?topic=205406.0.



I am was having power draw questions too.  I think that mining LTC on top of OC ing the cards makes you draw alot of power.

[007158]

Mining bitcoin for an hour with 4 gpus at 1100/1250 1020w at most from wall so easily within psu. Powered one more raiser what allowed for more even split between rails. Looks like i'm getting a bit less hashes, stable 570 with 3 gpus, now 550 at most and a lot of time is like 500 or 520. Also cannot underclock memory with cgminer, setting gpu works ok but memory always stays at 1250.

For anyone who wants to do this i'd definately recommend single rail psu.


edit: weird gpu-z shows 1250memclock and afterburner shows 500(what i typed in --gpu-memclock) when i open it while mining.

edit: so it failed anyway, only after 3 hours not 15 minutes, while pulling 1060 from wall, 4 rail psu sucks, especially that 2 rails are not modular(atx+2xgpu,2gpu!!!), will just get 1300w single rail psu.

[-ck]

You must limit your memory underclock to no more than 150 less than the engine speed (driver limitation). Best way to do this with cgminer is to add --gpu-memdiff -150

[peacemaker420]

Could also be an issue with chipset over heating!!!  can you post your motherboard model?

I had this issue as well and thought it to be bunky PSU at first...(I was in the setup stage for this rig trying out 2x7950 on an 850 watt PSU) I tried at least 30 different configurations with PSU/GPU/Motherboard combo's until I actually took a good look at the board and found that two of my 7950's were sitting right above the motherboard chipset.

Plain and simple there is inefficient heat dissipation for chipset heatsinks on a lot of motherboards, whenever my miner shutdown randomly and unexpectedly, I checked the heat on this (and burned my hand quite a few times!!)

My conclusion on random insta-shutdowns is it typically boils down to 3 things
-Kernal Panic due to driver failures
-Insuffiecient Power Draw from PSU to the motherboard when Cards are running 100%
-Component overheating/damage (chipset or in rare cases CPU)


Hopefully this helps!!!

[zvs]

Same thing happened to me.  2x "Gigabite" 7970 with 750 Watts OCZ power supply.

Shut down after both cards came online to mine with GUI miner.  Upgraded to a 950 Watt PSU, problem solved.

Even a junk 750 watt power supply should be able to handle two 7970's...

have a single core CPU or disable the other cores, undervolt all that stuff (memory, cpu, fsb, etc), ubuntu on a usb, use some energy efficiency lcd monitor with a kvm switch

hmm, do ps2 mice/keyboards have less of a power draw than usb?   does disabling USB slots in bios save you a few watts from motherboard?

Component overheating/damage (chipset or in rare cases CPU)

i never mine litecoins, but, yeah, gpu's overheating wouldnt surprise me (cough not being able to lower memory to nothing).   sometimes you'll get cards with really crappy thermal paste job that'll have some sensor +20oC  higher than 'main'