Topic: System will only recognize 2 out 3 GPU's (Read 2930 times)
Ive gotten 3 7950s on a z77 extreme 6 working solid for a few months. Messed around with it and can't seem to get back to what I had. Have the same problems as the OP seems like a common issue mining with this board.
Correct. LTC. I have 2 small butterflies on order, but I'll eat a USB stick if they get delivered.
LTC is up to $4. I have not done the math for a few days but I believe LTC is more profitable right now.
LTC is up to $4. I have not done the math for a few days but I believe LTC is more profitable right now.
Edit: Umm yeah, sorry, didn't read last post in thread.
Congrats that it works now.
By the lower Hashrate you are getting I take it you are mining Litcoin or something. Because mining Bitcoins should be a lot faster with that setup.
Congrats that it works now.
By the lower Hashrate you are getting I take it you are mining Litcoin or something. Because mining Bitcoins should be a lot faster with that setup.
Well my miner died last night/early this morning. Could not figure out why but switched the 2nd and 3rd card with their PCIe slots and started it up. All three recognized and hashing between 487-520kH/s.
I thought this board would work with three as the build was posted here in Newbie by a pro.
Now to work on board number 2.........
Oh..I wish I could get the hash rate higher (using GUIMiner) but no matter what I do, Intensity, Memory, Engine, etc. - I just can't them higher. They are 2 Sapphire 7950 3Gb and a Gigabyte 7950 3Gb.
But for now I'm just happy I'm making money after 3 weeks of trials.
I thought this board would work with three as the build was posted here in Newbie by a pro.
Now to work on board number 2.........
Oh..I wish I could get the hash rate higher (using GUIMiner) but no matter what I do, Intensity, Memory, Engine, etc. - I just can't them higher. They are 2 Sapphire 7950 3Gb and a Gigabyte 7950 3Gb.
But for now I'm just happy I'm making money after 3 weeks of trials.
The technical specs clearly state this board has only 2 PCI-E 3.0 x16 Slots. The Third one is just a mini-PCI-E aka PCIE x8 Slot, which is not capable of running video cards on.
I don't think this is true. The manufacturer's web page for this motherboard states:
- 2 x PCI Express 3.0 x16 slots (PCIE2/PCIE4: single at x16 (PCIE2) / x8 (PCIE4) or dual at x8/x8 mode)
- 1 x PCI Express 2.0 x16 slot (PCIE5: x4 mode)
- 1 x PCI Express 2.0 x1 slot
- 1 x mini-PCI Express slot
- 2 x PCI slots
They also state: "Supports AMD Quad CrossFireX™, CrossFireX™ and NVIDIA® Quad SLI™, SLI™"
To support quad SLI/xfire, you will need 4 slots. This would be the two PCI-E 3.0 x16 slots, the one PCI-E 2.0 x16 slot, and the one PCI-E 2.0 x1 slot. Note that for mining purposes, it doesn't matter if it is a v3.0 or v2.0 slot, and it doesn't matter if it is a x16, x8, x4, or x1. Bandwidth does not matter for GPU mining, only core clock speeds.
You could get a "riser card" to convert the PCI-E 2.0 x1 slot into a x16 slot with one of these:
http://dx.com/p/pci-e-1x-to-16x-riser-card-extension-cable-15-5cm-length-100061
Then plug your GPU into that riser card, and you'd be good to go. Similar to what this guy did:
http://home.comcast.net/~smklear/milk2.jpg
http://www.asus.com/Motherboards/P9X79_PRO/#specifications
The best one i came across, in specs it says it will support quad.
The best one i came across, in specs it says it will support quad.
I had the same problem here. I hope you can fix it.
Still open to suggestions as to a board with 3 full PCIe x16 slots. I made the mistake of buying one with only 2.
Anyone..? Anyone...?
Anyone..? Anyone...?
Anyone have board they would recommend for running 3 7950's?
You're welcome
Well that's bad news, but a time saver. Thanks!
Just looked up the board:
http://www.asrock.com/mb/Intel/Z77%20Extreme6/index.asp
The technical specs clearly state this board has only 2 PCI-E 3.0 x16 Slots. The Third one is just a mini-PCI-E aka PCIE x8 Slot, which is not capable of running video cards on.
You'd need another mainboard to make us of all three cards.
http://www.asrock.com/mb/Intel/Z77%20Extreme6/index.asp
The technical specs clearly state this board has only 2 PCI-E 3.0 x16 Slots. The Third one is just a mini-PCI-E aka PCIE x8 Slot, which is not capable of running video cards on.
You'd need another mainboard to make us of all three cards.
Thanks for the advice. Card is good as I tried it on another board. But the rest I will need to verify.
Out of the blue, without looking up the board specifics one of the following could be true:
Board does not support more than 2 cards bios wise.
Middle PCI-E Slot is just x8 and not x16
Power cable connected to the failing card is broken
PCI-E Slot is broken
Card is broken.
Verify those step by step by trial and error.
This is more likely a failure on hardware end than on software end.
Board does not support more than 2 cards bios wise.
Middle PCI-E Slot is just x8 and not x16
Power cable connected to the failing card is broken
PCI-E Slot is broken
Card is broken.
Verify those step by step by trial and error.
This is more likely a failure on hardware end than on software end.
Yes - I got a black screen when I restarted. Monitor stayed asleep. Though I should try it again as I have done a few things since.
I assume you've tried plugging your monitor into the card that doesnt work and see if that changes anything?
Hoping someone can help me. I have 3 7950's on an ASRock Z77 Extreme6, Win 7 and I can't get it to recognize the middle GPU. Recognizes and mines the other two, just not this 3rd I just installed.
I reinstalled AMD Catalyst thinking it needed to run again to see the 3rd but that did not work.
I disabled the internal intel card thinking maybe it won't take more than 3 cards, but that did not work either.
I am sure I am missing something embarrassingly obvious. Can any shine light on stupidity?
I reinstalled AMD Catalyst thinking it needed to run again to see the 3rd but that did not work.
I disabled the internal intel card thinking maybe it won't take more than 3 cards, but that did not work either.
I am sure I am missing something embarrassingly obvious. Can any shine light on stupidity?
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