x1 you mean, and yes if you've got the room for it. though honestly i don't see a need for a soundcard as the onboard chipset audio is more than capable of any gamer or normal use needs... could probably get away with a decent recording settup aswell with the optical out aswell.
getting a sound card to releave stress off the chipset and cpu was something you did back in the day of win95 to the beginings of winXP. but with the power of chipsets and CPUs today it's really not an issue.
honestly i've never needed more than about 1.13-1.15v, 1.13 being the sweet point. as you start to go higher, your display will tend to just shut off on you it seems and it's quite annoying and it's even caused my BIOS to freeze during post.
unless you're running something around 7.5G on the data link i don't think you need to worry about it much. others can correct me if i'm wrong but i found no reason to increase IOH voltage unless qpi data link speeds were 7.5+
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