Based on the Performance Score, we can make a comparison with other cards. It becomes rather obvious at what resolutions you gain performance. Let's start with the current-generation cards. The percentages show how much the GTX 1080 Ti is faster, compared to these other cards
|GTX 1080||GTX 1070||RX 480|
|Full HD Medium||5,8%||15,9%||51,3%|
|Full HD Ultra||11,1%||27,8%||81,9%|
|Ultra HD Medium||22,5%||46,1%||103,7%|
|Ultra HD Ultra||29,2%||61,8%||143,8%|
The GTX 1080 Ti is a good deal faster than the GTX 1080 - the average difference is 17.5%. This might not look like a lot, but that is in part due to the card not being faster at resolutions where the GPU is not the bottleneck. In Ultra HD Ultra, the GTX 1080 Ti is 29.2% faster, and in WQHD Ultra and Ultra HD Medium a little more than 20%. Compared to the GTX 1070, the difference is 39.5% on average, and 61.8% in Ultra HD Ultra. Finally, the GTX 1080 Ti is on average almost twice as fast as the RX 480, with significantly more than a 100% performance boost in Ultra HD Ultra and WQHD Ultra!
|t.o.v. R9 Fury X||t.o.v. GTX 780|
|Full HD Medium||40,8%||98,4%|
|Full HD Ultra||53,6%||177,5%|
|Ultra HD Medium||54,7%||172,8%|
|Ultra HD Ultra||78,0%||312,9%|
Compared to the high-end cards of previous generations, the performance increase is even greater. The GTX 1080 Ti is 57.7% faster than the R9 Fury X. Compared to the GTX 780 (don't forget that it was based on the high-end GK110 GPU) the gain is amazing: depending on the resolution it can be more than 300%. In part this is because the DirectX 12-support in Kepler simply was not very good.
These data make it obvious that almost all the performance boost is at resolutions of WQHD and higher. In Full HD, most of these older cards suffice, especially if you do not insist on 144 Hz gaming.