PRCman (OP)
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June 02, 2011, 03:19:36 AM |
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"This isn't the kind of software where we can leave so many unresolved bugs that we need a tracker for them." -- Satoshi
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bcpokey
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June 02, 2011, 03:45:44 AM |
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You could do 6 cards by using PCI-E extenders. Just a warning though you run the risk of exploding the motherboard if you run 6 5870s, as the PCI-E bus still delivers power to cards despite having external power connectors. I don't know the exact numbers, the spec calls for 75W max, so say 40 * 6 = 240W running through the PCIE Bus.
Of note, a $200 motherboard that requires a $200+ CPU isn't necessarily that money saving. You can find cheap AMD AM3 boards with 5 PCI-slots (x1 works fine) for ~$120 with a $40 sempron that saves you > $250.
In fact you could get 2x $120 mobos + 2x $40 CPUs, have 10 slots for cards and still have spent less than you would have on LGA1366.
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PRCman (OP)
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June 02, 2011, 03:55:48 AM |
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You could do 6 cards by using PCI-E extenders. Just a warning though you run the risk of exploding the motherboard if you run 6 5870s, as the PCI-E bus still delivers power to cards despite having external power connectors. I don't know the exact numbers, the spec calls for 75W max, so say 40 * 6 = 240W running through the PCIE Bus.
Of note, a $200 motherboard that requires a $200+ CPU isn't necessarily that money saving. You can find cheap AMD AM3 boards with 5 PCI-slots (x1 works fine) for ~$120 with a $40 sempron that saves you > $250.
In fact you could get 2x $120 mobos + 2x $40 CPUs, have 10 slots for cards and still have spent less than you would have on LGA1366.
what kind of AMD AM3 boards have 5 PCI-E slots which could install a graphic card?
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SchizophrenicX
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"I'm not psychic; I'm just damn good"
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June 02, 2011, 06:40:27 AM |
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Gigabyte GD70. get extender cable for 1 or 2 of the PCIe. and theres still PCI-E to spare if u have adapter.
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PRCman (OP)
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June 02, 2011, 06:53:23 AM |
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darvil
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June 02, 2011, 06:54:33 AM |
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I assume you don't put these setup in an actual case?
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SchizophrenicX
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"I'm not psychic; I'm just damn good"
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June 02, 2011, 07:29:28 AM |
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I list some of the resources that you may be interested in while planning your mining rig in my Building "guide" including this. Also, I think it isn't that difficult to find specification on the GD-70, take heed that,as darvil, I also assume you're not putting them in a case, and you probably have to solve the PSU problem (as I had to initially which I didn't and gave up) if you put so many GPU on on MOBO. (Max PSU prolly around 1500 W, you'll need more than that)
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burtyb
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June 02, 2011, 11:44:16 PM |
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I tried running with 6 HD5870 on a single MB but I could only get 4 out of the 6 to work properly, XFX couldn't see any reason why but figured it was down to resource problems with the MB - I've since changed to use 3xHD5870 per MB.
ChrisB.
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bcpokey
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June 02, 2011, 11:52:42 PM |
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Were you crossfiring the cards? Or in Windows XP 32bit (I think). Crossfire is forced to 4 GPUs max. One version of windows is reported to also have that limitation.
As for PSU problem, 6 5870s can run comfortably on a 1200W with no worries. The biggest worry is still as I said frying the motherboard by running so much power through it.
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Reckman
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June 03, 2011, 12:59:10 AM |
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If you have more than 4 GPUS you need to run linux, windows cant use more than 4
also by the time you buy one of those motherboards and a 1366 processor, your probably wasting money over buying two smaller rigs
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PRCman (OP)
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June 03, 2011, 01:40:14 AM |
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I tried running with 6 HD5870 on a single MB but I could only get 4 out of the 6 to work properly, XFX couldn't see any reason why but figured it was down to resource problems with the MB - I've since changed to use 3xHD5870 per MB.
ChrisB.
What motherboard are you using?
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burtyb
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June 04, 2011, 06:25:46 PM |
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What motherboard are you using?
Whatever POS that came with the an Dell SC440. Were you crossfiring the cards? Or in Windows XP 32bit (I think). Crossfire is forced to 4 GPUs max. One version of windows is reported to also have that limitation.
No crossfire, running under Ubuntu. As for PSU problem, 6 5870s can run comfortably on a 1200W with no worries. The biggest worry is still as I said frying the motherboard by running so much power through it.
I'd also advise thinking about how you're going to get power to the 6pins. ChrisB.
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SchizophrenicX
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June 05, 2011, 02:48:07 AM |
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Theres another issue that is the PCIe slots actually powers the card like up to 70+ watts maybe the MOBO couldn't handle that much power request or something (similar to what was mention)
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mlouca
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June 05, 2011, 03:40:46 AM |
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If you have more than 4 GPUS you need to run linux, windows cant use more than 4
also by the time you buy one of those motherboards and a 1366 processor, your probably wasting money over buying two smaller rigs
windows limits you to 4 gpus per motherboard?
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