Interesting. I have only seen one review on guru3d for the Sea hawk. The only other info I've found is user reviews... which are typically people just happy whatever they bought turns on when they get it. If that is true about db levels I may just get the Strix instead.
Hmm... guru3d is saying both Sea Hawk and Gaming X are near silent:
http://www.guru3d.com/articles_pages/msi_geforce_gtx_1080_sea_hawk_x_review,11.html
Looks that might be where you got your info too, actually. Gaming X looks to also be a very quiet card. I did notice the load temps were about 70 for the Gaming X compared to 48 for the Sea Hawk. That's less heat in your case and more potential oc headroom. That might be worth it to some. I am still not certain... but considering between seahawk and Strix myself.