K702 is somewhat current and power hungry, but integrated of that motherboard would likely be enough.
Though for gaming that mobo seems to lack any kind binaural sound simulation.
Standard speaker stereo mix sucks for immersion with headphones:
You'll just have sounds accurately positioned inside left or right ear, or in center of the head:
https://youtu.be/Y6ROujJ8Ae8?t=50s
Lack of HRTF algorithm is actually common drawback of many integrated sound cards.
Mobo mkers hype all expensive audio fashion words, but lack feature needed for headphone gaming.
One of the reasons why I don't see sense in paying any super high motherboard prices for supposedly better soundcards and such.
You can't even use that integrated longer than you use mobo.
Especially Creative sound cards have good HRTF.
Though Creative has customizable HRTF using Super X-Fi finally coming to sound cards in Q3 in that "project accent":
https://us.creative.com/upgrade/
Such shame Microsoft killed DirectSound.
Sound card using customized HRTF to calculate sound for headphones from original 3D audio data of game with true sound source locations would be best for immersion.
K702 owner here also.
I find them brilliant for gaming for the reasons given, they are extremely (pinching the phrase) analytical. Have helped me identify enemies a lot recently. I don't listen to a lot of music through them but what I do listen to I find pleasant enough but lacking at the lower end but I rarely listen to music with headphones on so it isn't really a concern (for me as I have a set of 2.0's that do have low end).
The decisiveness is both a blessing and a curse. Good news the board drives them though, hopefully the amp will stretch their legs a bit. Which amp if you don't mind my asking?
Ive not long had that amp, i wouldn't say it makes any real difference to the sound but it drives my 712 and hd595's very well and looks cool
One plus (for me!) is the line out at the front is directly connected to the Line in which means you can have your speakers plugged in without any need for software swapping.
Fidelio X2HR up for half price today only, sure you can find them. Easy to drive, decent soundstage and my recommendation for an all rounder after the K712, but you won't have to buy an amp.
The HD595 i have are very clinical and i cant say the amp really altered them, like yourself im no audiophile. At a push i'd say it added the slightest hint of bass but that could just be me hearing things! However i do have some Mullard valves coming (fool and money yada yada ), if your interested i'll share my thoughts when i get a chance to test them out.
I've finally had chance to give them a go!
Thoughts! they are smaller than stock and they look better built internally. im not sure on the NOS claim, ive seen tubes from the 60's and the boxes tend to have a more waxy feel and i'd have expected the glue to be more brittle. Else i couldn't care less about it being NOS or not but i know people buy into that. These are ebay specials so who knows!
Now is there a difference? this is really questionable and im not sure i've been swayed by other peoples thoughts or not. But i'll go along and say they do seem to have softened the sound somewhat. I'd say the stock tubes give a more precise sound and these are more mellow in comparison.
However i prefer the stock ones with my hd595's, and Mullard with the K712's headphones. I'd have thought it would be the other way round considering i feel the hd595' are on the clinical side
I cant say if its better or worse other than just slightly different.