USB Risers problems - page 2. | Bitcointalksearch.org

raidersan

newbie

Activity: 36

Merit: 0

Quote from: Amph on July 01, 2016, 06:24:46 AM

Quote from: raidersan on July 01, 2016, 05:51:17 AM

How many GPU's will the ProBTC take without risers? I have 6 cards, 8 core on each MB

only 1, you need x1 x16 risers, there is really no need to spend much for usb riser, i've always used standard riser, and they always worked good, just don't buy from unreliable source

Can you provide a link to a reliable source?

Kewatia

sr. member

Activity: 299

Merit: 250

Quote from: Amph on July 01, 2016, 11:56:18 AM

Quote from: AlphaSun on July 01, 2016, 11:43:38 AM

Quote from: Amph on July 01, 2016, 07:41:04 AM

Quote from: raidersan on July 01, 2016, 07:16:44 AM

Sorry I expressed myself poorly. How many GPUs will a pro BTC be able to feed off the motherboard itself without powered risers, just with ribbon cable risers? In my rigs I have 6 cards, totalling 8 Tahiti GPUs. That seem a lot of power for just the 2 molex on the ProBTC board.

each molex can provide 132 watt, so you have 264w, plus the motherboard can provide 25w for each x1 slot and 75w for the single x16 slot, so a total of 200w

464w in total can be provided by the motherboard, it's more than enough for any 6 x card setup, minus those 2xchip gpu, like 7990

One power cable from the PSU will have 3 to 4 molex connectors, does it mean each cable can provide up to 500W?

if they are all 4 pin yes, but i remember that this is not the case, and anyway one cable would melt in that way, but i'm not sure about this

I have a few modular PSUs, all of them have 3 to 5 4pin molex connectors. So I will be very careful.

Amph

legendary

Activity: 3248

Merit: 1070

Quote from: AlphaSun on July 01, 2016, 11:43:38 AM

Quote from: Amph on July 01, 2016, 07:41:04 AM

Quote from: raidersan on July 01, 2016, 07:16:44 AM

Sorry I expressed myself poorly. How many GPUs will a pro BTC be able to feed off the motherboard itself without powered risers, just with ribbon cable risers? In my rigs I have 6 cards, totalling 8 Tahiti GPUs. That seem a lot of power for just the 2 molex on the ProBTC board.

each molex can provide 132 watt, so you have 264w, plus the motherboard can provide 25w for each x1 slot and 75w for the single x16 slot, so a total of 200w

464w in total can be provided by the motherboard, it's more than enough for any 6 x card setup, minus those 2xchip gpu, like 7990

One power cable from the PSU will have 3 to 4 molex connectors, does it mean each cable can provide up to 500W?

if they are all 4 pin yes, but i remember that this is not the case, and anyway one cable would melt in that way, but i'm not sure about this

AlphaSun

full member

Activity: 226

Merit: 100

Quote from: Amph on July 01, 2016, 07:41:04 AM

Quote from: raidersan on July 01, 2016, 07:16:44 AM

Sorry I expressed myself poorly. How many GPUs will a pro BTC be able to feed off the motherboard itself without powered risers, just with ribbon cable risers? In my rigs I have 6 cards, totalling 8 Tahiti GPUs. That seem a lot of power for just the 2 molex on the ProBTC board.

each molex can provide 132 watt, so you have 264w, plus the motherboard can provide 25w for each x1 slot and 75w for the single x16 slot, so a total of 200w

464w in total can be provided by the motherboard, it's more than enough for any 6 x card setup, minus those 2xchip gpu, like 7990

One power cable from the PSU will have 3 to 4 molex connectors, does it mean each cable can provide up to 500W?

RastoMan

sr. member

Activity: 294

Merit: 250

Quote from: Amph on July 01, 2016, 07:41:04 AM

Quote from: raidersan on July 01, 2016, 07:16:44 AM

Sorry I expressed myself poorly. How many GPUs will a pro BTC be able to feed off the motherboard itself without powered risers, just with ribbon cable risers? In my rigs I have 6 cards, totalling 8 Tahiti GPUs. That seem a lot of power for just the 2 molex on the ProBTC board.

each molex can provide 132 watt, so you have 264w, plus the motherboard can provide 25w for each x1 slot and 75w for the single x16 slot, so a total of 200w

464w in total can be provided by the motherboard, it's more than enough for any 6 x card setup, minus those 2xchip gpu, like 7990

The 7990 uses little power from the motherboard PCIE slots.

Amph

legendary

Activity: 3248

Merit: 1070

Quote from: raidersan on July 01, 2016, 07:16:44 AM

Sorry I expressed myself poorly. How many GPUs will a pro BTC be able to feed off the motherboard itself without powered risers, just with ribbon cable risers? In my rigs I have 6 cards, totalling 8 Tahiti GPUs. That seem a lot of power for just the 2 molex on the ProBTC board.

each molex can provide 132 watt, so you have 264w, plus the motherboard can provide 25w for each x1 slot and 75w for the single x16 slot, so a total of 200w

464w in total can be provided by the motherboard, it's more than enough for any 6 x card setup, minus those 2xchip gpu, like 7990

raidersan

newbie

Activity: 36

Merit: 0

Sorry I expressed myself poorly. How many GPUs will a pro BTC be able to feed off the motherboard itself without powered risers, just with ribbon cable risers? In my rigs I have 6 cards, totalling 8 Tahiti GPUs. That seem a lot of power for just the 2 molex on the ProBTC board.

Amph

legendary

Activity: 3248

Merit: 1070

Quote from: raidersan on July 01, 2016, 05:51:17 AM

How many GPU's will the ProBTC take without risers? I have 6 cards, 8 core on each MB

only 1, you need x1 x16 risers, there is really no need to spend much for usb riser, i've always used standard riser, and they always worked good, just don't buy from unreliable source

raidersan

newbie

Activity: 36

Merit: 0

How many GPU's will the ProBTC take without risers? I have 6 cards, 8 core on each MB

Amph

legendary

Activity: 3248

Merit: 1070

usb risers are unnecessary, i'm running 5 x 970 without issue, using the standard ribborn risers, just buy h81 pro btc

raidersan

newbie

Activity: 36

Merit: 0

I have molex cables from each riser to the PSU - I have never bought a riser with aluminium, where is that aluminium placed? Mine always have a spongy bit at the bottom to have shorts but they do end up falling after a few weeks with the heat. Do you have a link to the risers you bought?

Redrose

hero member

Activity: 756

Merit: 502

I get mine on Amazon. Did you wired molex cables to the motherboard ? Do your risers have a kind of aluminium paper on them ?

raidersan

newbie

Activity: 36

Merit: 0

I have a 4 rigs with 6 GPUs on each, all using powered 1x-16x Risers. The GPU's are mixed bag of 7950, 7970, 280, 290, 390, and exactly 2 7990's per rig.
Initially all goes well but I am constantly getting failures of the risers, and I cannot put my finger onto the cause. Is it bad quality of the riser, are some cards trying to extract too much power out of them? I have risers coming various sources on eBay but I suspect that most of them come from China anyway. None of them are carry a brand though.
Could it be linked to the PSU?
If it is as I suspect the quality of risers, where do you get quality ones, preferably in Europe?

Many thanks!

Topic: USB Risers problems - page 2. (Read 2775 times)