Hi can i run a nvidia gtx970 and a nvidia g 315 in the same computer and what will happening if i can

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No, they won't. The ONLY advantage would be if you needed an extended monitor using a second HDMI or other output that wasn't possible on the first card due to a lack of necessary secondary HDMI or other sockets. You can use dual cards as a method of secondary HDMI etc., if your card has only one and you need to and do not wish to use an adapter. That's pretty much it.

To gain any performance advantage, you would need a second GTX 970. WITH a GTX 970, it's unlikely you will NEED any other card installed as it's performance is sufficient for all but the highest resolution gaming on multiple monitors.
No, they won't. The ONLY advantage would be if you needed an extended monitor using a second HDMI or other output that wasn't possible on the first card due to a lack of necessary secondary HDMI or other sockets. You can use dual cards as a method of secondary HDMI etc., if your card has only one and you need to and do not wish to use an adapter. That's pretty much it.

To gain any performance advantage, you would need a second GTX 970. WITH a GTX 970, it's unlikely you will NEED any other card installed as it's performance is sufficient for all but the highest resolution gaming on multiple monitors.
 
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