I haven't been around quite that long but I do remember the days when people would recommend that even though ATI's first and second generation Radeons were really good, stay away from ATI though because their driver support is the pits. If you remember those days, the 2000s. These driver woes continued on after AMD merged with ATI. (see below)
Good, then your use case does not require the 1080ti. That 4790k has onboard Intel HD 4600 graphics I think. Reason is, you should try for 60 some days straight using Linux without any Nvidia card. Nvidia's Linux driver is known to cause random untraceable problems, that you should not waste time trying to track down and fix. It's a return to the good/bad old days of ATI (driver) recommendations. Could happen to any user, any afflicted OS. Its the manufacturer who controls this.
Intel's driver support and also AMD's driver support on Linux is far superior. It's just plug in and go.
You might not ever be "excited" about it that isn't the necessary benchmark. I do feel confident that if you give it some time without that Nvidia card installed you will notice a change for the better.
Then come back to the Nvidia card, you should. It is a good quality card, its problem of having a sketchy driver. Just give it ample time and try out all of your use cases for a while using the HD4600.