I haven't really had much time to test my non-xtreme card as I went on holiday shortly after I installed it (been benchmarking remotely though
). My impression is that the card itself clocks very well (even my non-xtreme clocks to 2,140MHz when it's not doing very much, 2,040MHz under 100% load, as well as a +600MHz memory OC), but it is let down by the cooling solution which, subjectively looks good, but performs relatively poorly and hence results in high temps and loud fans.
For this reason I've managed to purchase one of the top of the line Strix 2080 Ti OC O11G models for the same original price as the xtreme variant of this card (£1290) which should be with me tomorrow. The reason for this is that the cooling solution is FAR superior from the reviews I've read, managing a max temp of just 59C with the stock fan profile (my AORUS would never reach that temp even with 100% fan speed and an open case).
We shall see how it goes when I get to better test both cards tomorrow, hopefully I shouldn't be left too much out of pocket, if at all when I inevitably sell on one of them.
Will update here if anyone is interested in a like-for-like comparison between the 2 cards.