Intel has multiple chip flaws and now is 30% slower I have an i5pro and it sux now compared to my AMD based rig after the patch.
I know about the chip flaws. lol
Most people with Intel chips won't be affected much with regards to gaming. Servers however, can have up to 20-25% reduction in performance. Bottom line; if you're on Windows 10 with kabylake, skylake or newer, you will not notice a performance decrease.
Even with a 30% performance decrease, the i5 8600k or i7 8700k will still beat the Ryzen 1700 for gaming.... but there will not be a 30% performance decrease. Not even close.
Seeing as how the 1080GTX TI Launched In March, 2017 and the 1080 GTX Launched in May 2016, I'm calling bullshit on your "4 year old" system on ultra settings.
A "4 year old system" would most likely have a 970 or 980GTX.... which absolutely will not run the newest games on Ultra. It's older than my video card, and mine is getting on in age.
All that said, old Intel systems would still suck to own.