ryantc (OP)
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June 01, 2013, 09:41:54 AM |
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I need to rearrange some of my cards Currently I am running 3*7950 + 1*7850 on a 1000w platinum psu and I am thinking to swap out the 7850 and add a 7970 instead
if I undervolt all my cards (they are all working @ 1.05v happily), and put mem clock to insanely low on a 775 E7200 platform with 1 RAM and 1 SSD
am I pushing the PSU too hard?
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lucazane
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June 01, 2013, 09:53:54 AM |
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The PSU should be ok. But I always try to have my mining rig at less than 80% percent of PSU load. if you look at this chart, you can see that the typical PSU efficiency go down after 50% of load. ![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fwww.digikey.com%2FWeb%2520Export%2Ftechzone%2Fpower%2Farticle-2012august-front-end-ac-dc-fig1.jpg&t=665&c=Z1zi_lp9JiPyWw) With your configuration, you will be between 900 and 1000 w. I would go for at least a 1200w PSU.
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Gordon Bleu
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June 01, 2013, 10:28:08 AM |
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i'm still trying to figuring out,
wouldn^t it be cheaper to use
2x 600w PSU or 1x 600 + 1x 750w or 2x 800w ?
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pajak666
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June 01, 2013, 12:46:57 PM |
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definetly go 1200w for 4 gpu's 1000w is not enough 3x 7950 + mobo + cpu + ram = ~830-960 W, so 1200 should be enough for 4 x 7900
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ryantc (OP)
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June 01, 2013, 01:45:03 PM Last edit: June 01, 2013, 03:32:47 PM by ryantc |
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thanks for all your replies
en......have another thought, can I add another 500w e.g Corsair cx500 on top of the 1000w to run the 4 7900 rig? I mean in terms of wattage this time it should be enough, but is it safe enough to do it this way?
I might have some misinformation that cards, wires, PSU itself get burned because of this kind of setup, so I am a little hesitate
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Equate
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June 01, 2013, 03:50:56 PM |
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1200W is enough but if you want to overclock then go for LEPA G1600
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bcpokey
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June 01, 2013, 10:09:50 PM |
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To date I have yet to hear of one person happy with their dual PSU setup, almost always leads to problems. I am intrigued by the product http://www.newegg.com/Product/Product.aspx?Item=N82E16817206001 however I do not know if it is a good value, but that's probably one of the only ways I'd recommend dual PSU. You are probably running your PSU close to its limit, so maybe underclock/undervolt a bit and hope for the best.
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crashoveride54902
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June 01, 2013, 11:09:51 PM |
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Ok that date has come...I'm running 3x7970's oc'd off my seasonic 860w n offbrand 600w psu without a problem ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) To date I have yet to hear of one person happy with their dual PSU setup, almost always leads to problems. I am intrigued by the product http://www.newegg.com/Product/Product.aspx?Item=N82E16817206001 however I do not know if it is a good value, but that's probably one of the only ways I'd recommend dual PSU. You are probably running your PSU close to its limit, so maybe underclock/undervolt a bit and hope for the best.
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Dreams of cyprto solving everything is slowly slipping away...Replaced by scams/hacks ![Sad](https://bitcointalk.org/Smileys/default/sad.gif)
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nwoolls
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June 01, 2013, 11:27:46 PM |
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So I just built a 4 x 7950 setup with an AMD Sempron 145 processor and 3 GB of RAM. It pulls down just over 1150 Watts with the GPU's overclocked (and GPU memory underclocked) and with a physical HDD.
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mdude77
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June 01, 2013, 11:30:45 PM Last edit: June 01, 2013, 11:52:07 PM by mdude77 |
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Ok that date has come...I'm running 3x7970's oc'd off my seasonic 860w n offbrand 600w psu without a problem ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) To date I have yet to hear of one person happy with their dual PSU setup, almost always leads to problems. I am intrigued by the product http://www.newegg.com/Product/Product.aspx?Item=N82E16817206001 however I do not know if it is a good value, but that's probably one of the only ways I'd recommend dual PSU. You are probably running your PSU close to its limit, so maybe underclock/undervolt a bit and hope for the best. I've done it (two, even triple PSUs) as well. I've since switched to Rosewill lightning 1300 PSUs: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182063&Tpk=rosewill%20lightning%201300&IsVirtualParent=1Speaking of such, I've got one that is 2 months old max that needs a new home. I'll ship it to you (continental US) for BTC equiv of $175. Going to list it soon in the computer for sale section... M EDIT: didn't mean auction
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massnerder
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June 02, 2013, 04:33:04 AM |
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So I just built a 4 x 7950 setup with an AMD Sempron 145 processor and 3 GB of RAM. It pulls down just over 1150 Watts with the GPU's overclocked (and GPU memory underclocked) and with a physical HDD.
I get 1090-1130w undervolted, definitely go with a 1200-1250w psu
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ronaldinho_07
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June 02, 2013, 09:28:27 AM |
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1200w psu can handle 4x7970 or 5x7950
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crashoveride54902
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June 03, 2013, 02:46:46 AM |
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i'm now also running 1 7970, 1 5970, n 1 5850 off a 860w n 300w psu ![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif) gotta use what i got...still have 1 card idle..only a 5770 so not a big loss...
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kinitex
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June 03, 2013, 04:21:32 AM |
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I've got 1x 7970 and 3x 7950 all heavily oc'ed with light under volting running on an 1100watt psu with absolutely no problems what so ever.
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RayG
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June 03, 2013, 06:20:12 AM Last edit: June 03, 2013, 06:49:14 AM by RayG |
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Depends on your GPU (overclocking) settings. I run my 4 x Sapphire 7950 rig undervolted: VDDC: 0.993V GPU: 930 MHz RAM: 1250 MHz at 845 W (~200 W/GPU). Hash rate (per GPU) is 565 kH/s (Litecoin) or 560 MH/s (Bitcoin).
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chungenhung
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June 03, 2013, 02:32:41 PM |
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Ok that date has come...I'm running 3x7970's oc'd off my seasonic 860w n offbrand 600w psu without a problem ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) To date I have yet to hear of one person happy with their dual PSU setup, almost always leads to problems. I am intrigued by the product http://www.newegg.com/Product/Product.aspx?Item=N82E16817206001 however I do not know if it is a good value, but that's probably one of the only ways I'd recommend dual PSU. You are probably running your PSU close to its limit, so maybe underclock/undervolt a bit and hope for the best. That date has come for me too. Been running several 2 PSU rigs for 2 yrs.
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