how many cards you run? can you tell me which pci-e ports you've used on risers? and did you short the pins (http://blog.zorinaq.com/images/pcie-short-schematic.png) ?

also i'll add more details of my hardware: i'm using 3xPSU 850W xfx. they are linked together. about 0,22 voltage on cards.

any gd55 users here?

hello. i've been trying to set my rig on risers since 3 days already and i got to the point where things are not supposed to be logic anymore.

my system is ubuntu 12.04.2 x64 (tried it on 13.10 before). the cards were all connected by risers and visible in system before installing drivers - i checked it via
after installing AMD Catalyst 13.11 Beta system won't start anymore - first monitor didn't turn on, after one reset or two it worked but system were hanging up every time at ubuntu loading screen. those drivers worked for me before on 3 cards connected directly to the motherboard. moreover the system didn't start even after removing all cards and leaving only one connected directly to mobo. then i tried to make a fresh install of ubuntu but my display was so blurred I couldn't see anything. so i set bios settings to default and then i could start ubuntu without reinstalling it. before resetting bios the settings were set to disable all peripheral devices i weren't using, also PCI-e 3.0 was disabled too (i was using default settings before, but since it didn't work in the first place i was trying other settings in bios). now i'm again able to run 3 cards connected directly to mobo. i have no idea what i can do to make it work. i have powered pcie-risers with capicitors. the cards on risers are connected with 8+6 pins and riser's molex are used too.

any ideas? please help. i'll try it on windows today, but i prefer linux in long-term so i have to solve this issue.

Thank you, that's what I wanted to know. The reason I was looking how to set up worker for each card was because I thought it will help to decrease "rejections" my rig is getting (~5%) - I read somewhere that I'll need additional workers for extra GPU's.

bump

hello, i'm wondering how to run cgminer for many workers. i want to run it for 6 gpu's (r9 290). how many workers do i need to run it smooth?
let's try it with this example config:

now:
1) is it possible to run multiple workers in one cgminer config?

2) if not, do i have to run 6 times cgminer with different setup?
in this case looks like each cgminer will be controling each gpu and i don't like this idea too much, so:

   2a) how to set up fans and other parameters like tc, gpu-engine - do i have to set them for each cgminer/gpu manually or they can stay like this?
   2b) how should it look like if i had for example 4x r9 290 + 2x r9 290x

please help me answer this questions, i bet it can help lots of people

jenveno thanks for a quick reply. i'm also wondering if the graphic card connected to the 1x-16x pci-e riser can be connected (and working) to the monitor?

hello,
i'd like to know is it possible to connect 1x(male)-16x(female) powered risers to the motherboard's pci-e 16x slots? if yes, are there any disadvantages comparing to 16x-16x risers?