singular (OP)
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January 16, 2012, 11:59:59 PM |
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Im thinking to build one of these but i dont know which motherboard and processor would be optimal to use. Do all motherboards with 4 16x pci-e slots support this and is this even possible or is 3x 7970 maximum? What psu would i need for this?
thanks
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dizzy1
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January 17, 2012, 12:12:51 AM |
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Im not sure about motherboards, but you would need a very large psu, prob 1200+, maybe 2. And you would probably need pcie x16 extenders to keep the heat down (because the cards would be right beside each other).
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dizzy1
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January 17, 2012, 12:30:19 AM |
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https://bitcointalk.org/index.php?topic=57410.04 should work for mining. I've seen 4 done in crossfire but they were right beside each other without any room for airflow. Going by the power draws here, 4x7970 should take about 800-900 watts. Show you should have at very least 1200, but if you are going to overclock probably go with a larger one like a 1500. I can't comment on that brand though. I would go with expanders and suspend the cards with at least 3/4 of an inch between them. But thats just me. Edit: http://www.youtube.com/watch?v=685-rXNR7o4Video showing system with 4 7970s in crossfire and full specs.
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singular (OP)
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January 17, 2012, 12:39:58 AM |
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Saw that thread with 3x 7970 used, thats why i asked if 4 are possible for mining ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) Also saw that youtube vid, but there are 4 cards put near each other and also motherboard and proc used are too costly for mining purposes.. I need "cheap" motherboard where i can put "shit" proc to do the job ![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)
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Eveofwar
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January 17, 2012, 01:10:49 AM |
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PCI-e extenders can be found @ http://cablesaurus.com/For that mobo... Expansion / Connectivity Slots - 2 x PCI Express 2.0 x16 slots (Single at x16 or dual at x8/x8 mode) - 2 x PCI Express 2.0 x1 slots 2 + 2 = 4
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singular (OP)
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January 17, 2012, 01:29:39 AM |
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haha ![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif) So there is 0 degradation of performance of any kind with doing this? ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) Also do you have a suggestion for ""cheap" motherboard where i can put "shit" proc" that differs from the mobo suggested by dizzy1? ![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif) tnx
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dizzy1
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January 17, 2012, 02:18:32 AM |
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No mining performance degradation (that I know of). But gaming on x1 could be degraded. To my knowledge any board with 4 pcie slots, no matter what the speed can host 4 video cards.
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Mousepotato
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January 17, 2012, 03:10:54 AM |
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I'd love to have a quad 7970 system for gaming, but for mining you'd be better off with 5970s as they're over 1 MH/watt more efficient.
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Mousepotato
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dizzy1
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January 17, 2012, 03:30:42 AM |
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I'd love to have a quad 7970 system for gaming, but for mining you'd be better off with 5970s as they're over 1 MH/watt more efficient.
That is true atm. I would wait to see some optimized miners for the 7000 series before definitivly saying that.
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singular (OP)
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January 17, 2012, 08:12:51 AM |
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Well 5970's are hard to get and also u take a risk of it being used.. And i can get 7970's quite cheap.. How do you guys think 7990 will perform? Im asking myself if i wait for it..
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singular (OP)
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January 17, 2012, 08:59:52 AM |
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Also can anyone suggest me motherboard from asus or asrock because i can get these cheaper?
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rclljj
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January 17, 2012, 12:38:54 PM |
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See one news,one pci can add 7 cards.
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singular (OP)
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January 17, 2012, 07:18:34 PM |
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link?
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DeathAndTaxes
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January 17, 2012, 08:20:52 PM |
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See one news,one pci can add 7 cards.
At what cost? More than an entire computer system? external PCIe and PCIe switches have been around for a long time they just don't make economic sense.
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JWU42
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February 08, 2012, 03:51:12 AM |
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And i can get 7970's quite cheap..
Define cheap?!?
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ChaosStorm
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February 08, 2012, 04:27:03 AM |
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Doesnt sound very cost effective at all. 6950's can be had for $200 each which is cheaper and cranks out more hashes with 2.
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Davyd05
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February 08, 2012, 07:36:10 AM |
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Yeah, that is an issue, gotta maximize, you're computer as a whole.
I suppose using riser can help to add more cards card via a mounting bracket for room ( I would assume risers would help increase airflow in most open board configs )
but I guess the logic I almost missed was .. 4 x 6950 vs 4 79xx,
you get 1316 mh/s with 4x 6950 you get 2400 mh/s with 4x 7970 ( I took a 650 single card and reduced performance to 600 just for heat and w/e argument sake)
But you still probably get the best performance with a 5970, might be harder to find, but if you got 400 bucks cad, or usd you can get atleast 1 a week via craigslist / kajiji not so much so on ebay though.
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JamesSandwitch
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February 08, 2012, 11:36:26 PM |
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Thank you for letting us know about this.
What can we do except this on this forum.. where restrictions are important than users!
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