Turn on GPU before Mainboard?

SirvaudeSirvaude Member Posts: 2
Hi there, I have a doubt.

Can I give 12v to a GPU (turn it on) before I turn on the mainboard?

I have a Gigabyte 7970, and a MSI Z77A-GD55, I also have a generic "500 Watt" PSU to supply the mainboard, and a HP DPS-1200FB PSU; I'm wondering if I can use it to supply only the GPU.

Assuming that I can supply the GPU with that HP PSU; Due that those PSUs works separately, do I need to turn them on at the same time or can I turn on the HP before the generic one?

I need to solve THAT doubt. AFAIK, I can use a relay of 5V or 12V connected to the generic psu and so, it will turn on it at the moment I turn on the mainboard... but before I do anything and burn something I need to know if I'm right or how should I do it.

Thanks in advance.

PS: Please excuse me if this isn't the right subforum, I'm new over here.
PS 2: I'm using usb risers and I'm planning to supply them with the generic psu.
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