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never in a month of sundays are cex providing a 5 year warranty on a used gpu!
I mean it's tricky as they're pretty much on par it looks like but the intel is new and will no doubt improve if they stay on top of their drivers.
Then again it's 12 Vs 16gb vram.
Still, I think I'd try the intel for that money. New is new after all.
depends on the rest of the system... If its an older system without rebar the Intel just isnt an option. In fact id probably take the 6700xt 9 out of 10 times unless the stars aligned.
You can regularly get a brand new 6750XT for around £280, I'd not be looking at saving £20-30 by going to CeX of all places.
Otherwise the 580 depending on the rest of your system.
Let us know how you get on, which specific model did you grab out of interest?