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Title: Power Supply and Pci-E power cables Post by: mikbal on March 07, 2017, 09:10:34 AM Hi,
I have 1050W thermaltake platinum power source for my 6 gpu (rx470) rig. http://www.tweaktown.com/reviews/6922/thermaltake-toughpower-grand-1050w-80-plus-platinum-psu-review/index.html (http://www.tweaktown.com/reviews/6922/thermaltake-toughpower-grand-1050w-80-plus-platinum-psu-review/index.html) It a single rail max +12V 1050. So nothing to setup cable wise. Mother board is asrock btc h81 pro btc r2.0. This power supply has 4 pcie cables each having two 6+2 connectors. I would like to connect all my 6 gpus. Cables are long enough to plug all of them however this means 4 of gpus will share the same cable. Of course i am using powered risers (ver 6) Issue here is psu shuts itself after about 8mins. Rig consumes 800watts from the wall . It works great for days with only 4 gpus connected. Each having their own pci power cable. I have ruled out bad motherboard since i have other asrock h81 boards to try on. Do i really need separate pci power cables for each of my cards? Do these cable have max power they can deliver? I really need an experts opinion on this. Thank you very much. Title: Re: Power Supply and Pci-E power cables Post by: CryptoWatcher420 on March 07, 2017, 09:26:37 AM I had an issue like that in which the H81 would power off and restart. problem was PSU didn't have enough juice for the gpu's it was trying to handle, 1050w psu barely the min, now if that was just 150w more you wouldn't have an issue, rule of thumb is you want to leave some overhead for the psu so its NOT working at 100%, its not a server grade psu also make sure you DO NOT have the 4 pin floppy molex's plugged into the motherboard
if it is a power issue, removeing one gpu will mostly confirm that you need a slightly better psu Title: Re: Power Supply and Pci-E power cables Post by: mikbal on March 07, 2017, 10:27:51 AM I had an issue like that in which the H81 would power off and restart. problem was PSU didn't have enough juice for the gpu's it was trying to handle, 1050w psu barely the min, now if that was just 150w more you wouldn't have an issue, rule of thumb is you want to leave some overhead for the psu so its NOT working at 100%, its not a server grade psu also make sure you DO NOT have the 4 pin floppy molex's plugged into the motherboard if it is a power issue, removeing one gpu will mostly confirm that you need a slightly better psu Thank you for the reply. Psu shuts down even when i have 2 gpus in the system. But only if i use a single cable to connect them both. One cable for each it doesn't crash. I will now test without the molex cables connected to the motherboard. I will report back. thanks. Title: Re: Power Supply and Pci-E power cables Post by: sigb0y on March 07, 2017, 01:05:32 PM I have the XFX 1050W PSU and it has 3 PCI-E cables with 2 (6+2 PIN) connectors each. I have connected 5x RX480 to this PSU (XFX GTR 8GB with 6 PIN connector) and it is working.
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