Hi i get some problems with my mining rig

Since i added 2 gpu (Sapphire hd7950) my rig became unstable.
When i launch cg miner it work well but after a few minutes 2 of my gpu start to fail, khash are changing constantly between 450 and 510khash, the 2 others card are working great btw but after a random time i always get a bsod

I'm running these gpu on a Asrock h61 btc pro mobo with 2X2 go of ram, i got one cooler master V1000 psu for 3 gpu and a cooler master V850 psu for 1 gpu  and i'm using powered risers.

I also plugged the 2 SLIpower molex on the mobo

When i disconnect 2 gpu it's working well, it's really when i start mining with 3 gpu that problems occurs.

I'm not overclocking the gpu, running them at stock clock, Engine at 925 and Mem at 1250mHz.

My .bat is the following :

cgminer.exe --scrypt  -o stratum+tcp://freedom.wemineltc.com:3334 -u kewomot.amd -p t --thread-concurrency 21712 --gpu-engine 925,925,925,925 -I 17,17,17,17 -w 256 -g 1 --gpu-fan 75,75,75,75


Thank you

Hi guys, i added a second Sapphire hd7950 to my rig today, and it doesn't show up in cgminer, i need it to run at the same settings than my first hd7950, the first is connected via pcie 16x and the second via pcie 1x on a asrock H-61 BTC Pro
This card shouldn't require a shorting pin since it's a motherboard specially created for mining purposes



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Salut les francais,

Je démarre dans la crypto et j'aimerais idealement me monter un mining rig avec 6 7950
J'en ai une seule pour l'instant et je recois bientot ma carte mere asrock h61 BTC PRO
Elle a un port pci 16x classique et 5 pci 1x, c'est pourquoi je cherche des risers, mais l'idée de les faire venir des usa ou de chine ne m'emballe pas tellement, j'ai deja eu des problemes de colis qui ne sont jamais arrivés
Il me faudrait donc 5 risers 1x vers 16 x et 1 riser 16x vers 16x
Bref ou avez vous acheté les votre, si quelqu'un en a en rab' je suis preneur ^^

Aussi j'aimerais savoir si avec une alim Cooler Master V1000 80PLUS Gold je peux alimenter 3 ou 4 7950 avec un leger overclock ?

Merci d'avance pour vos reponses  

Hi, i keep getting this error message everytime i start CGminer 3.7.2 with my Sapphire hd 7950 dual-x

Error -5: Enqueueing kernal onto command queue
GPU 0 failure, disabling

I'm using this .bat:

cgminer.exe --scrypt  -w 256 --shaders 0 --intensity 20 -v 1 -g 1 --lookup-gap 2 --thread-concurrency 21712 --gpu-engine 1100 --gpu-memclock 1500 --gpu-memdiff 0 --gpu-powertune 20 --temp-cutoff 90 -o stratum+tcp://gigahash.wemineltc.com:3335 -u tomewok.amd -p t


What is wrong ? why it doesn't work ?

Thanks for your answers.