4 graphic cards->ok, 5 graphiccards -> not ok

[martin.po21]

Hy

First i would like to say thank you for quick support in your IRC channel
Now i encountered problem, which i guess is better to be discused here...

What is bothering me:

If i install 4x hd5970 on my MB (890FXA-gd70) everything runs ok.
clinfo output is OK,
aticonfig --odgt --adapter=all is able to display temps of all gpus.
oclhashcat runs OK.

When i install 5th hd5970 and after aticonfig --adapter=all --initial -f and reboot:

clinfo output:

PHP Code:

Segmentation fault (core dumped) 


aticonfig --odgt --adapter=all is not able to display temps of additional graphic card (look at the bottom of code):

PHP Code:

pozi@ubuntu:~$ aticonfig --odgt --adapter=all

Adapter 0 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 60.50 C

Adapter 1 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 67.00 C

Adapter 2 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 61.00 C

Adapter 3 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 62.50 C

Adapter 4 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 59.50 C

Adapter 5 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 61.50 C

Adapter 6 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 30.50 C

Adapter 7 - AMD Radeon HD 5900 Series
            Sensor 0: Temperature - 36.00 C
ERROR - Get temperature failed for Adapter 8 - AMD Radeon HD 5900 Series
ERROR - Get temperature failed for Adapter 9 - AMD Radeon HD 5900 Series 


but aticonfig --lsa recognise all of them:

PHP Code:

pozi@ubuntu:~$ aticonfig --lsa
* 0. 1b:00.0 AMD Radeon HD 5900 Series
  1. 1a:00.0 AMD Radeon HD 5900 Series
  2. 17:00.0 AMD Radeon HD 5900 Series
  3. 16:00.0 AMD Radeon HD 5900 Series
  4. 0f:00.0 AMD Radeon HD 5900 Series
  5. 0e:00.0 AMD Radeon HD 5900 Series
  6. 0b:00.0 AMD Radeon HD 5900 Series
  7. 0a:00.0 AMD Radeon HD 5900 Series
  8. 07:00.0 AMD Radeon HD 5900 Series
  9. 06:00.0 AMD Radeon HD 5900 Series 


and lspcie too...

Problem is not graphic card or slot related- i tried every possible combination, it occurs only when i install 5th card.

What i did:
set PCIE latency timer in bios to 96 and 128, neither solves problem

Other informations:

PSU: LEPA 1600W 80plus (there is plenty of wattage unused)
I use PCIE risers, i tested them all and they are working as supposed to.
OS: Ubuntu Server 12.04.4 LTS
catalyst: i have tried 14.9 and 14.12, same problem at both of them
oclHashcat: version 1.31

Can someone please give me some advice? It seems a shame not to use all 5 graphic cards.

<offer to pay removed by philsmd>

Thanks in advance!
martin.po21