Went ahead and got this one: Gigabyte AORUS GeForce GTX 1080 Ti Xtreme Edition, 11GB GDDR5X, 352 bit (do you have the same one Phil? may I call you Phil? )

Tried different drivers:
- 378.92 gives about 680 h/s on ZEC at stock
- 382.33 (latest) - 715 - 730 h/s on ZEC at stock; seems to be the better choice. Running only one card on Win 10.

Then I moved to Skein. Using ccminer-2.0-release-x64-cuda-8.0 and added ccminerAlexis78 build:



Seems to be the best profitability at the moment. (5% pool fee factored in for fees + other losses):

Nu stiu ce sa zic. Eu minez doar eth si nu am prea multe probleme. Mi-am dat seama ca am crashuri atunci cand folosec rig-ul sa stau pe net sau sa rulez programe. Daca il las in pace merge fara probleme. Cred ca am procesorul prea slab si ram ca putin.

Poate nu le place overclock...se intampla. Ai putea sa incerci sa modifici biosurile si apoi sa le lasi memoria stoc  si gpu clock la 1266. Obtii mai mult asa decat obtii acum cu bios original + overclock. Pe la vreo 28 eth.


In fine, mi-am luat un Gigabyte Aorus Extreme 1080ti. E un animal de placa. Am pus-o pe skein si merge bine. ROI in 3 luni la preturile de acum.
Ziceai ca te gandesti sa mai cumperi placi...ar fi o optiune buna desi e cam scumpa la noi.

Well I don't think anybody can tell you exactly what's wrong. The best advice you got was to troubleshoot everything as there could be many reasons...did you try the cards with another system?
Also when you take the vbios from one card and flash it to others there could be issues as well even if they're the same manufacturer/model. One of my 470's has a 256kb rom and the other 512kb and they are identical models.

So it looks like I was able to modify VoltageObjectInfo and insert VDDC offset register. Try it and see if it's stable. May need a different offset depending on chip quality.

Got it. Sent you a reply.

I gave you a hint in the other thread. Did you look it up?
Anyway, I asked somebody to send me a vbios from a 570 but didn't get it.
If you would send me a copy I can look to see if the same fix can apply.

I would be interested to see as I'm looking to get some sapphire 570's. Send me a copy of the original bios and I'll have a look.

CPU: G4400 Skylake
SSD: any would do. I use kingston UV400 120gb

Si mie imi face figuri cateodata de imi vine sa il arunc. Am patit si de la Trixx, de la windows ... o sa le trec pe linux in curand
Daca e stabil mai mult timp incearca modificare bios una cate una. Eu minez doar eth pentru ca nu vreau sa le fortez prea mult, problemele pot fi si de la soft (claymore)

Cand ai timp arunca un ochi si pe https://bitcointalk.org/index.php?board=160.0. De acolo am invatat cam tot de la simple la modificari de bios cu editor hex...

The vbios is modded with a hex editor first. Very few cards, as I understand, have this voltage controller in place (not sure if the term is technically correct). The normal vbios would show what you are seeing. Didn't need the tool after all (i just put the right value in hex to give me needed offset) but this thread lead me to this tutorial: https://www.youtube.com/watch?v=sc5qFEIMYTs&feature=youtu.be. If you're computer savvy you should be able to figure it out   

Sunt multe posibile cauze ...

Ia-o de la capat. Deconecteaza tot, verifica toate conexiunile.
Ce tip de risere ai? Molex, sata sau pci 6 pin? Sa nu ai mai mult de 2 risere pe un fir care iese din sursa...

Cea de 1000W poate tine toate 5 placile daca ai destule cabluri la ea. Eu am 850W pentru 4 placi+ restul componentelor si nu am probleme.

ce sursa ai? Poate nu duce 5 placi in dual mining?

Ai incercat doar cu ETh single mining?

Trimite-mi tw pe privat

This is a great tool! Managed to modify the bios (hex edit) of my sapphires nitro+ Samsung memory and now I can add voltage offset.
I found that setting a -150 actually gives -125  after flashing. -125 gives -100 so whatever you set seems to be off by 25mv.

http://imgur.com/a/7cI0Y

Prepping the rig for linux so I was wondering if anyone had any suggestions as how to set a proper fan curve through manipulating the numbers in the fan tab of SRB Polaris.

http://imgur.com/a/40p63

Super.
Pentru dual mining te joci cu dcri value cu tastele +/- si vezi care e mai bun.
Incearca cu memoriile la 2100 (poti sa mergi si pana la 2200, daca nu iti scade hashrate e ok. E safe!) si gpu clock la 1150 pentru un consum mai scazut. Neaparat sa faci si smecheria cu voltage offset de care ti-am zis

So which 1080 ti do you guys recommend?

These would be my options:

Gigabyte AORUS GeForce GTX 1080 Ti Xtreme Edition, 11GB GDDR5X, 352 bit
Gigabyte AORUS GeForce GTX 1080 Ti, 11GB GDDR5X, 352 bit
MSI GTX 1080 TI GAMING X 11G, 11GB GDDRX5, 392-bit
MSI GTX 1080 TI ARMOR, 11GB GDDRX5, 392-bit
ASUS GeForce GTX 1080 Ti STRIX GAMING O11G 11GB DDR5X 352-bit
ASUS GeForce GTX 1080 Ti STRIX GAMING 11GB DDR5X 352-bit

Any thoughts appreciated. Thanks

Foloseste ddu sa scoti driverele existente http://www.guru3d.com/files-details/display-driver-uninstaller-download.html.
Daca tot nu ai bios modificat, ia cele mai noi drivere de pe site-ul amd.
Cand instalezi driverul, conecteaza doar placa conectata la portul pci-e principal - instaleaza - shut down - conecteaza inca o placa - porneste si lasa-l 2 -3 minute sa recunoasca placa - verifica in device manager ca e recunoscuta - repeta pentru restul placilor una cate una.

Si mai bine windows 7 decat 8 (e praf 8 ) . Windows 10 e cel mai ok sau Ubuntu daca stii.

Ce gpu clock ai? Valoarea standard de 1266(1036)? De aici vine caldura si consumul extra.
Ar trebui sa faci undervolt si vor fi mai reci fara a afecta performanta. Poate fi o diferenta in jur de 5 grade cu undervolt. Poti face cu watttool. Am postat o poza acum cateva zile in care e incercuit ce trebuie sa setezi.

Pana in 70 grade e ok. De preferat pana in 65.

Depinde cum pozitionezi placile. Daca sufla aer cald una in cealalta de aici vine diferenta de temperatura + ai 2 modele diferite si reactioneaza diferit.

Sunt unii care au fan speed 80% si nu se duc ventilatoarele. Depinde de fabricatie. In jur de 50% - 60% ar fi de preferat...din cate am inteles.

Incearca de instalezi 16.11.5 (cauta ddu - display driver unistaller - intai se scoti complet driverul existent). Nu ar trebui sa ai probleme.
Alta chestie...intra in biosul placii de baza si cauta setarile pentru pci express speed si seteaza la gen1.
Virtual memory in windows ai setat? Trebuie sa ai minim 16gb.

POt sa arunc un pchi dupa ce bagi windows 10. 8.1 e cam cea mai nasoala varianta pentru minat.