AlliumPorrum (OP)
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December 21, 2013, 09:33:07 PM |
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Everywhere it is said that you MUST have a powered risers if you are going to use more than 3 GPUs per mining rig. Now that I got my Asus R9 290's, I noticed that there is a separate PCIe power input in them.
So I'm just wondering; what exactly is the purpose for the powered riser, vs. one without a power? Are powered ones needed only with some older GPUS's without a dedicated power input? Do ALL R9 cards (270,280,290) a PCIe power input, so there wouldn't be a need for a powered version of the riser at all?
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Dawes
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December 31, 2013, 05:53:39 AM |
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Everywhere it is said that you MUST have a powered risers if you are going to use more than 3 GPUs per mining rig. Now that I got my Asus R9 290's, I noticed that there is a separate PCIe power input in them.
So I'm just wondering; what exactly is the purpose for the powered riser, vs. one without a power? Are powered ones needed only with some older GPUS's without a dedicated power input? Do ALL R9 cards (270,280,290) a PCIe power input, so there wouldn't be a need for a powered version of the riser at all?
This was the first search result for "powered risers", but it hasn't been answered? I too would like to explain the differences between powered and unpowered risers. |
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repairguy
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December 31, 2013, 10:07:22 AM |
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The gpu receives power from the connectors on the back and from the traces on the motherboard. The motherboard that I use has a 6 pin connector on the motherboard to power the pci-e slots. I do not use powered risers on a 6 card rig. If you do not have a power connector on the motherboard specifically for the pci-e slots you need to use powered risers, because the motherboard traces and the wire feeding them aren't thick/wide enough to carry the power for all of those cards
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AlliumPorrum (OP)
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December 31, 2013, 10:51:39 AM |
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If you do not have a power connector on the motherboard specifically for the pci-e slots you need to use powered risers, because the motherboard traces and the wire feeding them aren't thick/wide enough to carry the power for all of those cards
But my Asus R9 290's have their own power connectors, 2 x 6pin PCIe connector per card. Shouldn't powered riser be useless in this case? |
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repairguy
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December 31, 2013, 11:02:07 AM |
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But my Asus R9 290's have their own power connectors, 2 x 6pin PCIe connector per card. Shouldn't powered riser be useless in this case?
Yeah I read that the first time, The answer is still no. If you do not have a power connector on the motherboard specifically for the pci-e slots you need to use powered risers, because the motherboard traces and the wire feeding them aren't thick/wide enough to carry the power for all of those cards What is the brand/model of your motherboard? |
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AlliumPorrum (OP)
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December 31, 2013, 11:16:03 AM |
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But my Asus R9 290's have their own power connectors, 2 x 6pin PCIe connector per card. Shouldn't powered riser be useless in this case?
Yeah I read that the first time, The answer is still no. If you do not have a power connector on the motherboard specifically for the pci-e slots you need to use powered risers, because the motherboard traces and the wire feeding them aren't thick/wide enough to carry the power for all of those cards What is the brand/model of your motherboard? My MB is AsRock Z87M Extreme4. But; why in the world would the R9 take any power thru the MB, if it has it's own dedicated power connectors going directly to the power supply?? |
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repairguy
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December 31, 2013, 11:33:39 AM |
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Yes you need powered risers with that motherboard.
3 reasons it takes power through motherboard
1. according to specifications the two 6 pin connectors on the back of the card are not rated for enough power to run the entire card.(although I think the rating on them is considerably low compared to what they could actually handle)
2. the +12v from the motherboard also tells the card it is time to turn on
3. the circuits for the card are isolated, memory, gpu sections etc. (If you have a tv and a dvd player, you have to plug them both in to watch a movie, the dvd player cant suck power through the hdmi cable to operate) The graphics card is separated so if you don't have the 12v from the motherboard, part of it wont operate=card won't operate.
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paradiselife
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December 31, 2013, 11:54:45 AM |
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you are over thinking it yes the cards have power connections but this does not provide enough on it's own thus needing more power such as a powered riser.. if power is not evenly distributed you risk things frying on you
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AlliumPorrum (OP)
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December 31, 2013, 11:59:50 AM |
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Ok, thank you very much for your help, I'm surely getting powered ones!  |
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repairguy
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December 31, 2013, 12:00:00 PM |
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you are over thinking it yes the cards have power connections but this does not provide enough on it's own thus needing more power such as a powered riser.. if power is not evenly distributed you risk things frying on you
Not over thinking, Just answering the question factually. |
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paradiselife
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December 31, 2013, 12:05:34 PM |
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you are over thinking it yes the cards have power connections but this does not provide enough on it's own thus needing more power such as a powered riser.. if power is not evenly distributed you risk things frying on you
Not over thinking, Just answering the question factually. It was towards the OP.. not you |
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repairguy
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December 31, 2013, 12:45:09 PM |
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you are over thinking it yes the cards have power connections but this does not provide enough on it's own thus needing more power such as a powered riser.. if power is not evenly distributed you risk things frying on you
Not over thinking, Just answering the question factually. It was towards the OP.. not you Sorry, misread your statement, that time I was over thinking. lol |
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