Miner Issues - Please Help

[cryptopi]

I recently built a rig with:

• rosewill 1300 watt PSU - http://www.amazon.com/Rosewill-Certified-ATX12V-EPS12V-LIGHTNING-1300/dp/B0057JFOKU
• gigabyte ultra durable motherboard
• 4 sapphire vapor x 7950 GPUs - http://www.amazon.com/Sapphire-DL-DVI-I-SL-DVI-D-PCI-Express-11196-09-40G/dp/B009MML1UA/ref=sr_1_1?ie=UTF8&qid=1373516838&sr=8-1&keywords=sapphire+7950
• i7 3770k processor - http://www.amazon.com/Intel-i7-3770K-Quad-Core-Processor-Cache/dp/B007SZ0EOW/ref=sr_1_1?s=electronics&ie=UTF8&qid=1373517257&sr=1-1&keywords=i7+3770k
• 16GB corsair vengeance RAM - http://www.amazon.com/Corsair-Vengeance-Desktop-Memory-CMZ16GX3M2A1600C10/dp/B006EWUO22
• 4 powered riser cables (3 16x to 16x and 1 1x to 16x)
• western digital 500 GB HDD
• windows 8 64 bit
• a milk crate case

To start it out, I decided to only use two of the GPUs just to make sure that it worked. After some fiddling (plugging in monitors, etc.) I got the two 7950s to hash away in cgminer at intensity 20 at roughly 630-640 mhash each. Then I decided that I wanted another GPU so I shut the rig down. I then used a 16x to 16x riser cable and plugged another 7950 into a 16x PCI slot on the motherbaord. Then I plugged in the necessary 2x8 pin connectors to give the card power and the molex connector into the PCI riser cable. Then when I turned on the compter on, it did not even recognize the card. After I restarted the card, it finally did recognize it but when I activated cgminer and tried to mine on it I only got roughly 50 mhash out of it or so. I have switched out riser cables and I have plenty of power so I know they are not the factors causing the error. I have also tried plugging in monitors to the cards and that did not work either.

Does anyone know what could be going wrong/have any suggestions? I have tried everything I could think of and would be extremely grateful for any assistance. Is there anything I should change in the BIOS?

Thank you

[kuusj98]

I recently built a rig with:

• rosewill 1300 watt PSU - http://www.amazon.com/Rosewill-Certified-ATX12V-EPS12V-LIGHTNING-1300/dp/B0057JFOKU
• gigabyte ultra durable motherboard
• 4 sapphire vapor x 7950 GPUs - http://www.amazon.com/Sapphire-DL-DVI-I-SL-DVI-D-PCI-Express-11196-09-40G/dp/B009MML1UA/ref=sr_1_1?ie=UTF8&qid=1373516838&sr=8-1&keywords=sapphire+7950
• i7 3770k processor - http://www.amazon.com/Intel-i7-3770K-Quad-Core-Processor-Cache/dp/B007SZ0EOW/ref=sr_1_1?s=electronics&ie=UTF8&qid=1373517257&sr=1-1&keywords=i7+3770k
• 16GB corsair vengeance RAM - http://www.amazon.com/Corsair-Vengeance-Desktop-Memory-CMZ16GX3M2A1600C10/dp/B006EWUO22
• 4 powered riser cables (3 16x to 16x and 1 1x to 16x)
• western digital 500 GB HDD
• windows 8 64 bit
• a milk crate case

To start it out, I decided to only use two of the GPUs just to make sure that it worked. After some fiddling (plugging in monitors, etc.) I got the two 7950s to hash away in cgminer at intensity 20 at roughly 630-640 mhash each. Then I decided that I wanted another GPU so I shut the rig down. I then used a 16x to 16x riser cable and plugged another 7950 into a 16x PCI slot on the motherbaord. Then I plugged in the necessary 2x8 pin connectors to give the card power and the molex connector into the PCI riser cable. Then when I turned on the compter on, it did not even recognize the card. After I restarted the card, it finally did recognize it but when I activated cgminer and tried to mine on it I only got roughly 50 mhash out of it or so. I have switched out riser cables and I have plenty of power so I know they are not the factors causing the error. I have also tried plugging in monitors to the cards and that did not work either.

Does anyone know what could be going wrong/have any suggestions? I have tried everything I could think of and would be extremely grateful for any assistance. Is there anything I should change in the BIOS?

Thank you

Have a look and see if the card is stuck at low clocks (power saving)

[cryptopi]

I recently built a rig with:

• rosewill 1300 watt PSU - http://www.amazon.com/Rosewill-Certified-ATX12V-EPS12V-LIGHTNING-1300/dp/B0057JFOKU
• gigabyte ultra durable motherboard
• 4 sapphire vapor x 7950 GPUs - http://www.amazon.com/Sapphire-DL-DVI-I-SL-DVI-D-PCI-Express-11196-09-40G/dp/B009MML1UA/ref=sr_1_1?ie=UTF8&qid=1373516838&sr=8-1&keywords=sapphire+7950
• i7 3770k processor - http://www.amazon.com/Intel-i7-3770K-Quad-Core-Processor-Cache/dp/B007SZ0EOW/ref=sr_1_1?s=electronics&ie=UTF8&qid=1373517257&sr=1-1&keywords=i7+3770k
• 16GB corsair vengeance RAM - http://www.amazon.com/Corsair-Vengeance-Desktop-Memory-CMZ16GX3M2A1600C10/dp/B006EWUO22
• 4 powered riser cables (3 16x to 16x and 1 1x to 16x)
• western digital 500 GB HDD
• windows 8 64 bit
• a milk crate case

To start it out, I decided to only use two of the GPUs just to make sure that it worked. After some fiddling (plugging in monitors, etc.) I got the two 7950s to hash away in cgminer at intensity 20 at roughly 630-640 mhash each. Then I decided that I wanted another GPU so I shut the rig down. I then used a 16x to 16x riser cable and plugged another 7950 into a 16x PCI slot on the motherbaord. Then I plugged in the necessary 2x8 pin connectors to give the card power and the molex connector into the PCI riser cable. Then when I turned on the compter on, it did not even recognize the card. After I restarted the card, it finally did recognize it but when I activated cgminer and tried to mine on it I only got roughly 50 mhash out of it or so. I have switched out riser cables and I have plenty of power so I know they are not the factors causing the error. I have also tried plugging in monitors to the cards and that did not work either.

Does anyone know what could be going wrong/have any suggestions? I have tried everything I could think of and would be extremely grateful for any assistance. Is there anything I should change in the BIOS?

Thank you

Have a look and see if the card is stuck at low clocks (power saving)

I already changed the clocks several times - overclocked it, set it to stock clocks, and underclocked it. None of those made it work.

Thanks for the reply though

[mccminer]

Windows or Linux?

Disregard....I see now that it's Win8.  Unfortunately all of my experience is on Linux, so I'm not sure I have much to contribute now.   

[Zanatos666]

What miner are you using and what are your settings?