Propably solved, thanks!

[Fr15t7]

Hi! Modern motherboards for OC typically have no pci slots. And i have Infrasonic Quartet, which is pci soundcard. Some reviewers in the internet say, that it has "better sound than Asus Xonar Essence STX" and it has an amp, so i wish i can keep it when i will upgrade my PC. 
So... is it a good idea to use something like this: (attached)

with my new motherboard? 

Headphones that i am planning to use, if it is important, are something like sennheiser 6xx. Not really choosed yet, it's so hard when you can't listen to literally ANY headphones from "The Audio Board's Recommended Gear" in my city :c

And the adapter cost is around 25$ us

[Fr15t7]

Okay, i was struggling to find any reviews about such adapters, but i finally found them on Amazon. The reviews are veeery polar, but i propably still have to try it. 
Thanks!