Quote from: polylogic on October 12, 2017, 02:15:49 PM

Quote from: Vann on October 12, 2017, 02:00:26 PM

Quote from: thepixelgeek on October 12, 2017, 01:44:54 PM

I've used Asrock H81 boards without molex.

However, the manual for H110 makes it sound like total meltdown if you don't use molex. Thought, maybe, since it's 13 GPUs, it might be different.

Thanks for the info!

Quote from: polylogic on October 12, 2017, 01:27:05 PM

Quote from: thepixelgeek on October 12, 2017, 01:13:56 PM

Thanks! Where is the "power check" in the bios? What's is called?

Also, per the manual, and because it's 13 gpu's, it says these molex must be plugged in. I have to believe it's for a reason since this is a "mining" board, and ASrock is well aware of powered risers, no?

Are you using this board now?

Is the "power check" option in the bios something different? Where can I find it specifically?

Quote from: Vann on October 12, 2017, 12:18:39 PM

You don't need to use the motherboard molex PCI-E supplemental power when using all powered risers. You do need to disable the power check in the Bios or you will get a warning message at Post.

the reason is if you dont use powerered risers than you can connect the onoard molex and still have enough power.
if you look at the manual you can read that these molex supply extra power to pci slots

I think they have the warning because the riser kits ASRock sells provide +12V power through a cable connected to the PCI-E slots. In that case, you definitely need to use the PCI-E supplemental power connectors on the motherboard.

http://www.asrock.com/mb/spec/card.asp?Model=BTC+PRO+Kit

USB powered risers supply +12V power directly from the PSU and there is only a small +3.3V current coming from the PCI-E slot through the USB cable to the riser. That's why ASRock lets you disable the warning, though they should make more clear when you need to use the PCI-E supplemental power connectors.

nice riser kit, i like

and yeah, those would need the molex connected

The ASRock riser kit came out when ribbon risers were popular. I'm not sure the ASRock kit is better than using USB risers. The USB 6-pin risers have four capacitors for a stable current flow and a voltage regulator to prevent spikes, which the ASRock risers don't have. It's also questionable if providing power from the PCI-E slots for 13 cards through the motherboard is a good idea. The ASRock riser kit is expensive at $30 each too.