Sounds like your mobo isn’t properly set up in bios to handle all the gpu¨s connected on the pci-e.

That the mobo has x numbers of pci-e doesn’t really mean that it can support the same x amount of gpu´s without some tweaking.

I have a bunch of mobos, and they truly are a nightmare sometimes to get all the gpu´s to be recognized.

Given that aticonfig doesn’t display more than two cards i would say that this your problem.

Take out one card at the time to check which card actually gets recognized, then you get a better picture of which pci-e ports that don’t work, look in manual if some of em are disabled when using 16X slot etc, might be one of em requires the use of ivy bridge processor and the list goes on. I HATE MOBOS! can’t wait to test out my asrock h61 btc mining mobo :) if that is straightforward awesome i might just swap out all my mobos for it.

Yeah, I am trying to only get up to 3 GPUs per rig now. If I only use 2 it is fine, but when I got the 3rd one, it is SICK. So I read that I need to change the --gpu-vddc voltage 10 increment at a time. I am trying to do that. Anyone know how high I can get without burning the GPU?

OK lets do a bit of a rewind here, can you provide a list of all the parts you have please?

PSU, MoBo, Mem, GPU’s, Risers, HDD, O/S, you get the idea.

From there we can probably work it out a lot quicker for you, I’m on Skype if you wanna add me PM me for my details, and quite regularly visit east London if there really is a major problem that can’t be resolved here.

UM

PSU = 2 x Corsair 860i

Mobo = MSI Z77a-GD65

Memory = 2 x 4 RAM

GPU’s = Gigabyte HD7950

Riser = Have both 1 and 16 PCI slot power risers

HDD = 30 GB SSD

O/S = Xbuntu 13.05 (I tried 13.10 and 12.05 they both gave me problem)

I will try to fix it here, but if no success. I will reward you for coming down to fix this. :)

I will come, but not for the entire weekend. Maybe just one afternoon.

Just finished my 6 GPU rig. First, the basics: are all GPUs recognized by your OS? How did you connect GPUs, CPU, disk drive, risers to those two PSUs?

Yes, when I run aticonfig don’t list all the GPUs. I connect my GPUs with power risers, actually I am using a Coolmaster case LAN Box. And the GPUs are not directly on the mobo.

I got 6 Gigabyte HD7950 GPUs. I also have power risers for all of them. I am using xubuntu with i7 CPU and 8GB RAM. I also have MSI motherboard which suppose to support up to 6 GPUs.

Yes, I got 2 x Corsair 860i using Dual PSU 24 pins cable adapter to connect them together.

This is the commands I use in cgminer

#!/bin/sh

export DISPLAY=:0

export GPU_MAX_ALLOC_PERCENT=100

export GPU_USE_SYNC_OBJECTS=1

cgminer --scrypt -o stratum+tcp://stratum.wemineftc.com:4444 -u dragonkid.1 -p 1 --auto-fan --gpu-engine 1010 --gpu-memclock 1250 -I 20 -w 256 --thread-concurrency 21712

I have problem with my rig. Can I take it up to the pub? What time and what is the address of the meeting?

I have been trying to get my stupid rigs to run stable and ideally I can have 6 GPUs to work in my rig. But I can only use 2 GPUs. If I use 3 it will hang and give that 511C temperature error.

Is there anyone around London or near London, who I can actually take my rigs to their home or come to mine to fix it.

If I take it to the feathercoin meeting in Oxford, will there be anyone who can help?

Hello, I joined Feathercoin forum, because I saw in Youtube that the Feathercoin meeting is actually held in Oxford, not every far from me. It is about 1 1/2 hours drive. ^-^

I hope to discover how to best mine feathercoins. I am actually having some problem with my rigs.

I will as for help with more details about the configuration in another topic. :)