In your case i would recomend a separate unit. It doesn't look like you have enough room in your crate for any more cards.
yep that would be the idea... I will also need a new box
Topic: Newbie trying to set up a 6x7950 rig (Read 13884 times)
In your case i would recomend a separate unit. It doesn't look like you have enough room in your crate for any more cards.
yep that would be the idea... I will also need a new box
I am still to make tests with additional cards but I think at the end I'll just go with the suggested solution of getting an additional MB+RAM+processor
In your case i would recomend a separate unit. It doesn't look like you have enough room in your crate for any more cards.
I have managed to get 4 cards to mine. It turns out if there is one card plugged directly into a x16 slot you won't be able to use rised cards in any other x16 slot, so I had to move them into 1x.
I will try to borrow a kill-a-watt today and see how much power I'm drawing. However, overheating is definitely an issue. One of the cards (the one on the side) heats up to 86° if I leave the room closed and to 80° when open (but then we hear the noise in the whole flat, which makes my wife rather unhappy) with the fan running at 95%. I have to find a solution, especially if I want to add more cards.
I will try to borrow a kill-a-watt today and see how much power I'm drawing. However, overheating is definitely an issue. One of the cards (the one on the side) heats up to 86° if I leave the room closed and to 80° when open (but then we hear the noise in the whole flat, which makes my wife rather unhappy) with the fan running at 95%. I have to find a solution, especially if I want to add more cards.
Wow. Good job! You taught me something too - I had no idea about the X16 slot.
This will add a bit to your overall cost but you might try water cooling the GPUs. For example - http://www.swiftech.com/KOMODO-HD7900.aspx
It might be worth the extra if your wife is pissed.
Hmm interesting but a bit too expensive if I have to get the whole kit for all cards. I have reorganized the setup and spaced the cards a bit better and now I'm running it at a trable 70-72° after undervolting to 1.1V. If I leave the room closed the noise is hardly to be heard in the rest of the house.
I am still to make tests with additional cards but I think at the end I'll just go with the suggested solution of getting an additional MB+RAM+processor
osx is vulnerable, I am not sure about linux
a 16 digit random character osx password ~14hrs
osx is vulnerable, I am not sure about linux
OP: you really should save yourself a big headache and simply but another motherboard. You could get a suitable used 3xpcie mobo, cpu , and minimum ddr2 ram for probably 50 bucks? I don't see why you'd want to go the 6x route. It's plausible and good on you if you want to do it, but man, 2 3xvideo card pc's would be so much easier.
I have managed to get 4 cards to mine. It turns out if there is one card plugged directly into a x16 slot you won't be able to use rised cards in any other x16 slot, so I had to move them into 1x.
I will try to borrow a kill-a-watt today and see how much power I'm drawing. However, overheating is definitely an issue. One of the cards (the one on the side) heats up to 86° if I leave the room closed and to 80° when open (but then we hear the noise in the whole flat, which makes my wife rather unhappy) with the fan running at 95%. I have to find a solution, especially if I want to add more cards.
I will try to borrow a kill-a-watt today and see how much power I'm drawing. However, overheating is definitely an issue. One of the cards (the one on the side) heats up to 86° if I leave the room closed and to 80° when open (but then we hear the noise in the whole flat, which makes my wife rather unhappy) with the fan running at 95%. I have to find a solution, especially if I want to add more cards.
Wow. Good job! You taught me something too - I had no idea about the X16 slot.
This will add a bit to your overall cost but you might try water cooling the GPUs. For example - http://www.swiftech.com/KOMODO-HD7900.aspx
It might be worth the extra if your wife is pissed.
With 6 7950 cards, you should go with 2 rigs, both wit 3x7950.
For each rig you should get decent PSU, somewhere in 800W range (not less than 750W) with single 12V rail design.
Price difference between 2x 750W PSU and 1x1500W PSU (for 6x7950) is more than enough to buy 1 motherboard, CPU, HDD and 4GB of RAM.
You will avoid any potential windows problems when running 6 GPUs on one system (I didn't see a singe system with more than 5 GPUs), and you will have couple of inches between cards, unlike with 6 cards where you can't get more than 1". Like that you will have better cooling, and quieter system.
For each rig you should get decent PSU, somewhere in 800W range (not less than 750W) with single 12V rail design.
Price difference between 2x 750W PSU and 1x1500W PSU (for 6x7950) is more than enough to buy 1 motherboard, CPU, HDD and 4GB of RAM.
You will avoid any potential windows problems when running 6 GPUs on one system (I didn't see a singe system with more than 5 GPUs), and you will have couple of inches between cards, unlike with 6 cards where you can't get more than 1". Like that you will have better cooling, and quieter system.
Not entirely correct. you could just use 2x 750s for the single six unit. I run six gpus with win7 and no issues. However the spacing is a valid point. to use 6 gpus you have to have a custom case.
thats interesting..
i just got 15 x sapphire r9 290 tri x and was going to do 5 rigs with win 7..now i think ill try 3 rigs with 5 cards..
i already have 3x Gigabyte 990XA-UD3 AMD 990X (Socket AM3+) DDR3 Motherboard and 3x Silverstone SST-ST1200-G Strider Evolution Gold Series - 1200 Watt
could i run 5 cards on this mobo in win 7? how much extra power would i need for each rig? would i run 3 or 4 cards off the 1200w?
could you tell me exactly what else i need to make it work..ie specific power risers, things to connect psu's etc.. (Its my first build- so will need it spelled out)
thanks
I have managed to get 4 cards to mine. It turns out if there is one card plugged directly into a x16 slot you won't be able to use rised cards in any other x16 slot, so I had to move them into 1x.
I will try to borrow a kill-a-watt today and see how much power I'm drawing. However, overheating is definitely an issue. One of the cards (the one on the side) heats up to 86° if I leave the room closed and to 80° when open (but then we hear the noise in the whole flat, which makes my wife rather unhappy) with the fan running at 95%. I have to find a solution, especially if I want to add more cards.
I will try to borrow a kill-a-watt today and see how much power I'm drawing. However, overheating is definitely an issue. One of the cards (the one on the side) heats up to 86° if I leave the room closed and to 80° when open (but then we hear the noise in the whole flat, which makes my wife rather unhappy) with the fan running at 95%. I have to find a solution, especially if I want to add more cards.
With 6 7950 cards, you should go with 2 rigs, both wit 3x7950.
For each rig you should get decent PSU, somewhere in 800W range (not less than 750W) with single 12V rail design.
Price difference between 2x 750W PSU and 1x1500W PSU (for 6x7950) is more than enough to buy 1 motherboard, CPU, HDD and 4GB of RAM.
You will avoid any potential windows problems when running 6 GPUs on one system (I didn't see a singe system with more than 5 GPUs), and you will have couple of inches between cards, unlike with 6 cards where you can't get more than 1". Like that you will have better cooling, and quieter system.
For each rig you should get decent PSU, somewhere in 800W range (not less than 750W) with single 12V rail design.
Price difference between 2x 750W PSU and 1x1500W PSU (for 6x7950) is more than enough to buy 1 motherboard, CPU, HDD and 4GB of RAM.
You will avoid any potential windows problems when running 6 GPUs on one system (I didn't see a singe system with more than 5 GPUs), and you will have couple of inches between cards, unlike with 6 cards where you can't get more than 1". Like that you will have better cooling, and quieter system.
Not entirely correct. you could just use 2x 750s for the single six unit. I run six gpus with win7 and no issues. However the spacing is a valid point. to use 6 gpus you have to have a custom case.
With 6 7950 cards, you should go with 2 rigs, both wit 3x7950.
For each rig you should get decent PSU, somewhere in 800W range (not less than 750W) with single 12V rail design.
Price difference between 2x 750W PSU and 1x1500W PSU (for 6x7950) is more than enough to buy 1 motherboard, CPU, HDD and 4GB of RAM.
You will avoid any potential windows problems when running 6 GPUs on one system (I didn't see a singe system with more than 5 GPUs), and you will have couple of inches between cards, unlike with 6 cards where you can't get more than 1". Like that you will have better cooling, and quieter system.
For each rig you should get decent PSU, somewhere in 800W range (not less than 750W) with single 12V rail design.
Price difference between 2x 750W PSU and 1x1500W PSU (for 6x7950) is more than enough to buy 1 motherboard, CPU, HDD and 4GB of RAM.
You will avoid any potential windows problems when running 6 GPUs on one system (I didn't see a singe system with more than 5 GPUs), and you will have couple of inches between cards, unlike with 6 cards where you can't get more than 1". Like that you will have better cooling, and quieter system.
Ok after reading a bit I have shorted pins 4 and 5 and measured the voltages with a multimeter. Everything is plugged, I try to start the system with 4 7950s (one plugged into the MB and 3 with risers) but nothing happens. The screen stays blank and the CPU cycle LEDs of the Z77A board are off (except the first two). The digits on the debug LCD move between "30" and "33"
Answering myself again... it turns out multi-monitor support was disabled on my board and coincidentally the wifi also got disconfigured (no remote access) so it was just the VGA output getting disabled every time I plugged a GPU.
Now all I have to solve is why the GPUs connected to PSU #2 with the jumped pins aren't being detected by Windows (even though they are powered with fans spinning). Hopefully I can figure it out before my wife decides to move out (I hoped to set this up a lot faster and now I've been completely absent for the last days with this).
Ok after reading a bit I have shorted pins 4 and 5 and measured the voltages with a multimeter. Everything is plugged, I try to start the system with 4 7950s (one plugged into the MB and 3 with risers) but nothing happens. The screen stays blank and the CPU cycle LEDs of the Z77A board are off (except the first two). The digits on the debug LCD move between "30" and "33"
Thanks, I start to see the light now. I'll be quite happy for the moment if I can get 4 GPUs to work, only then I'll start investigating how to use all 6 
I have Corsair CX750s (the cheapest category I think).
The only thing which ATM is not 100% clear is how I have to jumper the pins for the second PSU. I have seen there is a device called Add2PSU which solves this, do you think it's not necessary?
Edit:
I have found this old thread https://bitcointalksearch.org/topic/how-to-jump-together-two-power-supplies-to-run-one-motherboard-31357
with this picture
If I could get an adapter delivered here fast enough (which isn't the case) I wouldn't mind paying for it to have it done the "clean" way, but I guess I'll have to make this work the "dirty" way
I have Corsair CX750s (the cheapest category I think).
The only thing which ATM is not 100% clear is how I have to jumper the pins for the second PSU. I have seen there is a device called Add2PSU which solves this, do you think it's not necessary?
Edit:
I have found this old thread https://bitcointalksearch.org/topic/how-to-jump-together-two-power-supplies-to-run-one-motherboard-31357
with this picture
Quote
If you want it to turn on with the mobo connected supply, wire the same green PS_ON pin from the mobo supply to your second supply's PS_ON pin, along with one of the adjacent COM (ground) pins. This is how the cablesaurus adapter works.
If I could get an adapter delivered here fast enough (which isn't the case) I wouldn't mind paying for it to have it done the "clean" way, but I guess I'll have to make this work the "dirty" way
On the top of the larger ATX black plastic male (where the clippy bit is), pins 4 & 5 are what you want to push a paperclip into.
The apply some electrical tap around to hold in place.
I'm having trouble keeping the clip in place as the second connector is in the air (it is all quite flabby and the contact is weak). Is there maybe a way to short two pins to keep the second PSU in "always on" mode while I await for my Add2PSU to arrive? maybe pin PS_ON to +5 or +3.3?
Thanks, I start to see the light now. I'll be quite happy for the moment if I can get 4 GPUs to work, only then I'll start investigating how to use all 6
I have Corsair CX750s (the cheapest category I think).
The only thing which ATM is not 100% clear is how I have to jumper the pins for the second PSU. I have seen there is a device called Add2PSU which solves this, do you think it's not necessary?
Edit:
I have found this old thread https://bitcointalksearch.org/topic/how-to-jump-together-two-power-supplies-to-run-one-motherboard-31357
with this picture
If I could get an adapter delivered here fast enough (which isn't the case) I wouldn't mind paying for it to have it done the "clean" way, but I guess I'll have to make this work the "dirty" way
I have Corsair CX750s (the cheapest category I think).
The only thing which ATM is not 100% clear is how I have to jumper the pins for the second PSU. I have seen there is a device called Add2PSU which solves this, do you think it's not necessary?
Edit:
I have found this old thread https://bitcointalksearch.org/topic/how-to-jump-together-two-power-supplies-to-run-one-motherboard-31357
with this picture
Quote
If you want it to turn on with the mobo connected supply, wire the same green PS_ON pin from the mobo supply to your second supply's PS_ON pin, along with one of the adjacent COM (ground) pins. This is how the cablesaurus adapter works.
If I could get an adapter delivered here fast enough (which isn't the case) I wouldn't mind paying for it to have it done the "clean" way, but I guess I'll have to make this work the "dirty" way
On the top of the larger ATX black plastic male (where the clippy bit is), pins 4 & 5 are what you want to push a paperclip into.
The apply some electrical tap around to hold in place.
Thanks, I start to see the light now. I'll be quite happy for the moment if I can get 4 GPUs to work, only then I'll start investigating how to use all 6
I have Corsair CX750s (the cheapest category I think).
The only thing which ATM is not 100% clear is how I have to jumper the pins for the second PSU. I have seen there is a device called Add2PSU which solves this, do you think it's not necessary?
Edit:
I have found this old thread https://bitcointalksearch.org/topic/how-to-jump-together-two-power-supplies-to-run-one-motherboard-31357
with this picture
If I could get an adapter delivered here fast enough (which isn't the case) I wouldn't mind paying for it to have it done the "clean" way, but I guess I'll have to make this work the "dirty" way
I have Corsair CX750s (the cheapest category I think).
The only thing which ATM is not 100% clear is how I have to jumper the pins for the second PSU. I have seen there is a device called Add2PSU which solves this, do you think it's not necessary?
Edit:
I have found this old thread https://bitcointalksearch.org/topic/how-to-jump-together-two-power-supplies-to-run-one-motherboard-31357
with this picture
Quote
If you want it to turn on with the mobo connected supply, wire the same green PS_ON pin from the mobo supply to your second supply's PS_ON pin, along with one of the adjacent COM (ground) pins. This is how the cablesaurus adapter works.
If I could get an adapter delivered here fast enough (which isn't the case) I wouldn't mind paying for it to have it done the "clean" way, but I guess I'll have to make this work the "dirty" way
2x750w Psu won't be enough for 6 cards
I got many issue due to power loss on GPUs
A rig with z77+3x7970 work correctly (my 4 rigs are like this) with 1x750w for 2 GPU and 1x650w for board +1GPU , total Power on wall is near 1100w at full throttle (748Kh/s per GPU)
hope this help
I got many issue due to power loss on GPUs
A rig with z77+3x7970 work correctly (my 4 rigs are like this) with 1x750w for 2 GPU and 1x650w for board +1GPU , total Power on wall is near 1100w at full throttle (748Kh/s per GPU)
hope this help
This is true. I have a 7950 and a 7970 running full out with voltages tweaked as low as possible and I'm at slightly over 600 watts at the wall.
So start with 4 cards on the two PSUs and if you can, check the power usage with a kill-a-watt device. Do you know how to jumper the pins to start the PSU that isn't connected to a motherboard?
2x750w Psu won't be enough for 6 cards
I got many issue due to power loss on GPUs
A rig with z77+3x7970 work correctly (my 4 rigs are like this) with 1x750w for 2 GPU and 1x650w for board +1GPU , total Power on wall is near 1100w at full throttle (748Kh/s per GPU)
hope this help
I got many issue due to power loss on GPUs
A rig with z77+3x7970 work correctly (my 4 rigs are like this) with 1x750w for 2 GPU and 1x650w for board +1GPU , total Power on wall is near 1100w at full throttle (748Kh/s per GPU)
hope this help
Jump to: