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I think most people are probably looking to use an additional power supply to supply 12V to a discrete GPU, but I wanted to get 12V from the motherboard for my use case. The SATA ports only have 5V, so the only other easily accessible 12V I could think of are the fan headers. I'm sure I could find some place to solder to, but I'd rather not at this point.Asrock tech support says that the fan headers can supply 1A each, so there's a max of 24W available minus whatever the CPU fan needs. This works out well for me, as the SFP+ card I am looking to add only uses ~6W max. Well within the capacity of the spare header.Unfortunately, the M.2 to PCI-E 4x adapters I ordered don't have an open-ended slot even though they were advertised as such, so I can't test the actual card. I did have an Intel quad 1gb nic that was 4x, and I can confirm that it works and gets recognized when powered off the fan header.
I think most people are probably looking to use an additional power supply to supply 12V to a discrete GPU, but I wanted to get 12V from the motherboard for my use case. The SATA ports only have 5V, so the only other easily accessible 12V I could think of are the fan headers. I'm sure I could find some place to solder to, but I'd rather not at this point.
Asrock tech support says that the fan headers can supply 1A each, so there's a max of 24W available minus whatever the CPU fan needs. This works out well for me, as the SFP+ card I am looking to add only uses ~6W max. Well within the capacity of the spare header.
Unfortunately, the M.2 to PCI-E 4x adapters I ordered don't have an open-ended slot even though they were advertised as such, so I can't test the actual card. I did have an Intel quad 1gb nic that was 4x, and I can confirm that it works and gets recognized when powered off the fan header.
