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hi


please help me, i'm getting mad trying to fix my problem
i'm sick and tired about my miner but i don't want to give up


this is my first ubuntu experience and i managed to build
a ubuntu 13.10 miner with :

MSI Z77A G45 with 4 sapphire 7950 dual fan
Celeron G 1620 2.7 GHz
8 go of DDR3 1600 gskill RAM
1250 w corsair PSU
last drivers, fresh install, CG miner 3.7.2

through the install i ran into several problems but this time
i don't understand what happens ... :-\

the 3 card runs @ 610 kh/s steady
with clock 1020/mem 1250/vddc 1113/I 19/TC 24000
but the 4 th goes sick/dead after a period of time between 1 and 24 h
(i tried I 18 and TC 21712/22400 but the same happens)
note that i didn't undervolt it (the bios already said 1113 mv ... ?)


here's how the cards are plugged

the 1 st card is plugged on the first left 1X slot using a powered riser
the 2 nd and the 3rd card are plugged on the 2 PCIE 3 16X slot in the middle with risers
the 4 th card is plugged with a 1x powered riser on the last 1X slot on the right

see this picture to help understand https://dl.dropboxusercontent.com/u/9768004/z77ag45.jpg


i tried the two 1X slots between the PCIE 3 16X slots, i shorted the one which needed
but cg miner doesn't see my 4 th card when i'm starting it ...  :-\

according to the picture in the link, when my card in in the red 1X slot this
doesn't work because i use an adjacent PCIE 3 slot (16X slots) !
so this is normal if it doesn't work ...

but when connecting the card on the 2 slots left, which seems working
i typed on the console:


sudo aticonfig --adapter=all --initial


it gives:

found fglrx primary device section
found fglrx primary device section
found fglrx primary device section
found fglrx primary device section
Using /etc/X11/xorg.conf
Saving backup to /etc/X11/xorg.conf.fglrx-23


then i typed:

sudo aticonfig --adapter=all --odgt


on the non working, shorted, 1X slot ( not the red one ) it gives:

Adapter 0 - AMD Radeon HD 7900 series
                sensor 0: temperature 33.0c
Adapter 1 - AMD Radeon HD 7900 series
                sensor 1: temperature 31.0c
Adapter 2 - AMD Radeon HD 7900 series
                sensor 2: temperature 33.0c
ERROR - Get temperature failed for Adapter 3 - AMD Radeon HD 7900 series

 ???


on the working but instable 1X slot ( the last one on the right ) it gives

Adapter 0 - AMD Radeon HD 7900 series
                sensor 0: temperature 33.0c
Adapter 1 - AMD Radeon HD 7900 series
                sensor 1: temperature 31.0c
Adapter 2 - AMD Radeon HD 7900 series
                sensor 2: temperature 30.0c
Adapter 3 - AMD Radeon HD 7900 series
                sensor 3: temperature 29.0c

everything seems working fine ... but i've got a instable card on this slot !


can you help me to stabilise my 1x slot or help me to activate the dead one ?

i'll give a bounty to the person who helps me to find the reasons why ...


thanks a lot

Last time I've tried ubuntu for my rig it was 12.04. I had issues running multiple cards and ocing. I used different cards than yours though.

If you are willing to give windows a try it might work out of the box.

If not you may want to try BAMT instead of ubuntu. Which it is a linux distro actually designed to mine.

good luck

hi

thanks for your advice, i already have a good working
windows miner but i don't like windows ...
 ;D
and i'd like to switch it on ubuntu, or maybe BAMT

thanks for your time

::)

"Windows is so awful but I have to run it because it's the only thing that works."

ohhh btw...plug that card into a Windows PC and it'l be fine.

You can donate my reward to a charity of your choice.

i don't think it's the GPU it's more a mobo/bios/software/drivers problem

anyway windows sucks i d like to stick to ubuntu

linux is the only os i know which runs without failing for 10 years
it's free, smart and compiling a software for a computer is really neat

In my experience drivers and support for new hardware on linux is not that good. For oldish hardware is awesome. But I don't expect to run the latest gpu's at full efficiency under linux. I use linux as my main system. But for mining I use windows.

hello

is there anybody who can help me ?

ok guys


after a few weeks of research i found out what was happening and i wish to share it with everybody
because this fixed my problem !!

with the MSI Z77A G45
go into the bios and go to advanced and there should be a option (pci Latency Timer) that has 32 and need to boost it to 64 or even more if that doesn't work to 64 ( mine was @32 and i changed to 64)

here's the explanation:

"PCI latency timers are a mechanism for PCI bus-mastering devices to share the PCI bus fairly. "Fair" in this case means that devices won't use such a large portion of the available PCI bus bandwidth that other devices aren't able to get needed work done.

How this works is that each PCI device that can operate in bus-master mode is required to implement a timer, called the Latency Timer, that limits the time that device can hold the PCI bus. The timer starts when the device gains bus ownership, and counts down at the rate of the PCI clock. When the counter reaches zero, the device is required to release the bus. If no other devices are waiting for bus ownership, it may simply grab the bus again and transfer more data."

laters