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2070 is coniderable faster
2070 has RTX, 1080 ti does not
2070 still recieves game ready drivers.. 1080ti not
for compabiloty it not matter.
(sometimes even with compability mode for win xp older titles are iffy if your hardware is to new.
the 7xx series of grafic cards was the last officially supported by win xp.. but the 9xx series still had support for it.
the 1xxx and newer do not.. and I own many games that will work fine under the same win 7 upto an 980ti or titan black but not on anything newer..
the 1080ti and 2080ti are however both fully win 7 suppprted and not win xp supported.
so picking the older one does nor give yo any more compability in any game.
https://www.gpucheck.com/compare/nvidia-geforce-rtx-2070-vs-nvidia-geforce-gtx-1080-ti/intel-core-i7-8700k-3-70ghz-vs-intel-core-i7-7700k-4-20ghz/
RTX also means nothing for 2000 series because those cards are too slow to make good use of it.
1 no the 1080ti is slower
https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
2 my 2080ti that pretty much equals a 4070 mind to differ.
but OP wanted older games.. he did not say how old.
for first gen rtx games having it certaibly is betrer than not.
There were some good answers given there. It basically boils down to you can choose either because they are close and trade positions depending on circumstance. The person in the other thread was asking which to keep and already had both, but if you have neither and need to pick one, I'd probably lean towards the RTX 2070.
In relative performance, the RTX 2070 is either a bit slower than the GTX 1080 Ti according to TechPowerUp[www.techpowerup.com], or the RTX 2070 is sometimes equal to or sometimes faster than the GTX 2080 Ti according to the Tom's Hardware heirarchy posted in earlier replies.
This is going to be a bit more situational since boiling performance down to one figure has its tradeoffs like this. In other words, you may need to look at some key games that matter to you, and look at some differences between the GTX 1080 Ti and RTX 2070 to make this choice.
The GTX 1080 Ti is older. It will likely lose driver support sooner than the RTX 2070. It lacks support for mesh shaders and this really hurts performance in some (rare, for now) titles to the point it nearly makes them unplayable (not sure FSR or DLSS help this?). It lacks ray tracing (tensor) cores. It uses more power.
The RTX 2070 might be slower in some other cases. It is minus 3 GB VRAM.
That's how I'd boil it down. If I was looking at older games and especially if I already had both, maybe I choose the GTX 1080 Ti. If I'm buying one today and the current gaming market matters, I'd probably choose the RTX 2070. Realistically I wouldn't be looking at either, but I presume this is the used market.
https://www.youtube.com/watch?v=5zlgRJewqLM
2080 Ti is also normally in the same ballpark as a 3070 and slower than a 4070, it's only going to keep up with overclocking because you need to get at least 10% more out of it.
Not sure if it matters at 1080p, however. DLSS shines at 4K.