Sorry to mods not sure if I should ask this in the trading forum maybe?
 
Anyways,  my Super has a Kraken G12 with a H55 AIO attached.  It also has 2.5 years of warranty on it. Have constantly kept it on average at 65 degrees, I start capping frames when it exceeds that.
 
   Does anybody know the value of these cards?  Secondly would a buyer prefer to buy it with it's original cooler reinstalled or would the AIO cooling be more preferable/higher selling point?
 
First time EVER selling PC parts so total newb with this.

The new owner will need the original stock cooler to have a legit warranty. Void without.

I'd say install the stock cooler as sell them both separate. Be easier to box the card with the stock cooler in the original box.

I always check ebay final value sales for ideas in price. Auctions usually give you the idea what people are willing to spend.

Now price of RTX2080 will be lower because people know for 699$ worth RTX3080 with great performance.
I bought a GTX1080Ti for 550 euro with 25 months of warranty only because people didn't want to pay 100-200 euro less than new RTX2080.
But the situation was much better for people who want to buy the old series because the performance of new was too close.
Now people will crave for the performance difference between the RTX3080 and RTX2080Ti, don't even to talk about 699$ RTX3080 vs more expensive RTX2080. It's far more than 60% faster. In some fast research, I saw 50% difference between RTX3080 and 1400 EURO worth Turing.
That's NVIDIA we used to. Not only RTX, but pure performance is also here. 
I will need to satisfy with used RTX3090 in 2022. This time I will look for some reference models to buy Hydro Copper or Watercool.de waterblock...
 
I spent a lot of money buying branded new cloth...mostly Italian REPLAY, DIESEL, some LEVI'S, NAPAPIJRI jacket... 3000-3500 euro to upgrade old cloth. I didn't buy anything for 10 years, all money I spent on the computer.
And now I used this time because Turing was not attractive and Intel didn't have an interesting platform.
Better to wait for something better than to invest in Ryzen and Turing. 
Anyway I didn't figure out how to buy 600$ worth monitor, 32" 4K 60fps, before that using RTX3080 or RTX3090 on 1080p is joking.
GTX1080Ti is almost enough for everything on that...
I mean that's not GTX1080Ti, that's the performance of NVIDIA RTX2080 Founders without RTX but with more video memory.
The best situation for buying second-hand GPU is when new series have a small performance boost. Worse moment for buying second hand will be now.
When you almost buy the performance of GTX1080Ti with second-hand Turing instead available 3080 40-50% faster for 750 euro. 
How much could cost then RTX2080 second hand... 400 max, if you can add 300$ for more than 60% stronger GPU.
 

Haha I doubt that.. wait and see first.

The 3070 would have to be as fast or faster then the 2080ti.. and you would need to be able to order a 3070 as well.

IMOHO, until it's released and real world tested (remember space invaders), nobody except Nvidia and it's vendors really know how fast the 30 cards are, and because of all of the hype it's going to be hard to get a new card for a while, the price of the RTX 20 series, probably won't tank.
 

pbmpharmacist
I sold my MINT evga 2080 Super XC for $275 shipped and now the guy is complaining about "GPU sag".  Not sure if he's going to want to ship it back or not.  I definitely regret selling as my 3900x system is completely dead without a card.

Heh I'd point him to this:
 
https://www.amazon.com/YATENG-Graphics-Anodized-Aerospace-Aluminum/dp/B07S7ZBB51/ref=asc_df_B07S7ZBB51/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2957916890564623958&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030884&hvtargid=pla-827675236268&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2957916890564623958&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030884&hvtargid=pla-827675236268

GTXJackBauer
I usually go based on what ebay has them for.

Hrm looks around 450 to 550 on a basic first page search of "RTX 2080 Super"  but I imagine that will go down on 30xx release day.