i know its a long time since this thread, but incase of interest....
 
i have the XC3 ultra Hybrid. Early get sustainable overclocks up to 2050Mhz and can even set it to "permanent boost" with temps in the 55 to 60 degree range, provided i underplot the card. At those settings completely stable, including within my own CUDA AI models.
 
For gaming, i can ramp it up by about another 100Mhz and don't get crashes, although temps are about 7 to 10 degrees higher. HOWEVER, at those levels my AI models start to diverge quickly which suggests that errors are occurring, just not ones you can "see" on screen when gaming and not sufficient to cause a crash. Above that i get an immediate crash (and sometimes loops of crashes... be careful!)
 
With the 2050 overclock power draw at rest is usually around 35w and doesn't really go above about 280w even fully loaded. Compute times in my models do go down proportionally and frame rates do go up proportionally to the overclock so it seems to be working.
 
THE PROBLEM IS that the pump on my card is extremely loud and it is difficult to sit in front of the PC for any period of time at all..... to the point i have requested an RMA. 
 
It might well be that i have "won the silicon lottery" with my card so i am attempting to RMA just the hybrid cooler. If that fails, i might just buy a new hybrid cooler instead of worrying about the guarantee. I do have doubts though, and might go for a full custom loop (using EK) as there are other reports of noisy pumps. At the end of the day, a custom loop would cost £400 and the hybrid kit is £140, so i guess there is a difference in quality....
 
The EVGA card itself is GREAT tho, and if you hit it luck with the cooler, all good. If you don't, my personal view is that it is still well worth a punt.... I'm not a big gamer and am using the card daily for modelling [hint: a 3080Ti is way better value and sometimes even faster for games....]!