Utilizing all 5 PCIe slots on H81 Pro BTC

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   As per your motherboard's manual:

(4-pin SLI/XFIRE_PWR1 & 4-pin SLI/XFIRE_PWR2)

"Please connect these
connectors to the
power supply when
three graphics cards
are installed on this
motherboard." (they mean three or more, really)

These are 4-pin molex connectors. I can't imagine your power supplies don't have molex connectors, but if not, just get an adapter. This by itself might be why your last card isn't working properly when all the other ones are connected.
After connecting these power cables, if the last card doesn't work, see if the problem follows the card or the slot -- i.e. interchange a known working card to the slot that is giving issues and see what happens... if the card works in the other slot, then you know the slot is not the problem.

Sometimes when fully populating all PCI-E slots in a motherboard strange issues pop up, given that configurations like this are (IMO) rarely tested by BIOS QA. If you still have issues after connecting the power cables and it's not a slot issue, might want to send a support inquiry here: http://event.asrock.com/tsd.asp

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vacaloca Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 May 2016 Status: Offline Points: 36	Post Options Post Reply Quote vacaloca Report Post Thanks(0) Quote Reply Topic: Utilizing all 5 PCIe slots on H81 Pro BTC Posted: 26 Jul 2016 at 8:57pm
	As per your motherboard's manual: (4-pin SLI/XFIRE_PWR1 & 4-pin SLI/XFIRE_PWR2) "Please connect these connectors to the power supply when three graphics cards are installed on this motherboard." (they mean three or more, really) These are 4-pin molex connectors. I can't imagine your power supplies don't have molex connectors, but if not, just get an adapter. This by itself might be why your last card isn't working properly when all the other ones are connected. After connecting these power cables, if the last card doesn't work, see if the problem follows the card or the slot -- i.e. interchange a known working card to the slot that is giving issues and see what happens... if the card works in the other slot, then you know the slot is not the problem. Sometimes when fully populating all PCI-E slots in a motherboard strange issues pop up, given that configurations like this are (IMO) rarely tested by BIOS QA. If you still have issues after connecting the power cables and it's not a slot issue, might want to send a support inquiry here: http://event.asrock.com/tsd.asp

Wits Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Jul 2016 Location: Tampa Status: Offline Points: 3	Post Options Post Reply Quote Wits Report Post Thanks(0) Quote Reply Posted: 25 Jul 2016 at 10:32pm
	Good Morning, This might be a complete noob question and if so I apologize upfront. I am having a problem getting 5 cards to register properly on this board simultaneously. I have been able to get 4 of them to register in the device manager and function properly but the 5th either shows up with a driver splack (that in turn requires a reboot), or it shows up as a hidden device. To further explain my setup, I am running two EVGA Supernova 1000w Ps power supplies, 4 MSI R9 390x GPUs (3 of them are using riser boards and cables, 1 of them is plugged directly into the PCIe 16-pin port), 16GB of RAM, and a 3.2ghz pentium processor. The O/S is Win10 Pro. Running this setup everything functions normally and is mining well at 128 Mh/s. However, I have additional cards that I would like to utilize if possible. Is there a trick to utilizing all 6 ports simultaneously? In addition, I could not find any solid information about how to hook up the two 4-pin power connectors. Can someone please shed some light on this for me?