Thank you for letting us know about this.
What can we do except this on this forum.. where restrictions are important than users! 
Topic: 4x radeon 7970 mining rig (Read 7586 times)
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.
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.
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.
And i can get 7970's quite cheap..
Define cheap?!?
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.
link?
See one news,one pci can add 7 cards.
Also can anyone suggest me motherboard from asus or asrock because i can get these cheaper?
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..
How do you guys think 7990 will perform? Im asking myself if i wait for it..
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.
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.
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.
haha 
So there is 0 degradation of performance of any kind with doing this?
Also do you have a suggestion for ""cheap" motherboard where i can put "shit" proc" that differs from the mobo suggested by dizzy1?
tnx
So there is 0 degradation of performance of any kind with doing this?
Also do you have a suggestion for ""cheap" motherboard where i can put "shit" proc" that differs from the mobo suggested by dizzy1?
tnx
Thanks, dunno why but i always thought you can only put gfx cards to that big 16x slots only..
http://cablesaurus.com/index.php?main_page=product_info&products_id=10
Problem solved
2nd motherboard seems fine yes, but where do i get the extenders?
I also cant understand how guy put 4x 7970 to this: http://www.asrock.com/mb/overview.asp?Model=870%20Extreme3%20R2.0
(this guy: https://bitcointalksearch.org/topic/m.692082)
Or am i missing something?
I also cant understand how guy put 4x 7970 to this: http://www.asrock.com/mb/overview.asp?Model=870%20Extreme3%20R2.0
(this guy: https://bitcointalksearch.org/topic/m.692082)
Or am i missing something?
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
If you can use 4 in crossfire I dont see any reason why you can mine on 4 of them.
Hardware wise:
This one has 2 pcie x16 and and 3 pcie x1
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128519
This one has 4 pcie x16 slots and would only need one extender but I would reccomend 4.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514
If these are too expensive you could always looking in the sales section of the board here for a used motherboard.
Edit: This is a cheap/shit proc that MAY work, Its been a long time since I've looked at processors.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103888
Hardware wise:
This one has 2 pcie x16 and and 3 pcie x1
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128519
This one has 4 pcie x16 slots and would only need one extender but I would reccomend 4.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514
If these are too expensive you could always looking in the sales section of the board here for a used motherboard.
Edit: This is a cheap/shit proc that MAY work, Its been a long time since I've looked at processors.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103888
Saw that thread with 3x 7970 used, thats why i asked if 4 are possible for mining
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
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
https://bitcointalksearch.org/topic/3x7970-mining-results-57410
4 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-rXNR7o4
Video showing system with 4 7970s in crossfire and full specs.
4 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-rXNR7o4
Video showing system with 4 7970s in crossfire and full specs.
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).
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
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
Jump to: