Hey,
Two months ago I bought GTX 1080 Ti SC2 HYBRID mostly using it for rendering, installed it and everything works fine(25 degree on idle, 35-40 on full load). Afterwards I decided to install my old GTX 680 along with GTX 1080ti SC2 Hybrid, it is sometimes crucial to have 2-gpu's card when working in 3D apps. Well, I checked temperatures and it goes 91 degree (full load) on my GTX 1080ti Sc2 Hybrid, so I figured out that SC2 Hybrid Pump doesn't work. Removed Gtx680 and everything works fine again 35-40 degree (full load). Obvious reason for me was shortfall of power, so I decided to change my PSU 850w (yeah old socket 2011 consume a lot). I didn't find any proper PSU 1000w or 1200w (Hello miners), so temporally I installed two 700w PSU until I figured out where to buy proper PSU. Installed everything back Gtx680 and GTX 1080ti SC2Hybrid, 35-40 degree on full load. So, after one month of using it in this condition my Pump stopped again, restarted my Pc fix the problem. Is it normal that pump will stop periodically? or maybe two 700w gives some kind of breakage? Honestly didn't know that water cooling systems are to sensitive to power stability/consumption.. kind a noob in water cooling systems.  
 
If the problem in defectiveness of GTX 1080ti SC2 Hybrid, what is alternative of RMA? RMA sounds kind of headache for me, I'm using this card for daily rendering and I'm not living in US. Can I replace Waterblock Cooler by myslef? of course with all responsibility. What kind of water block you suggest?
 
Thanks in advance!
 
 
 

ty_ger07
With these hybrid systems, the pump is definitely the weakest link. Numerous people have reported the same issue on this forum and the solution has been to replace the hybrid system under warranty. Whenever Asetek's patent finally expires, maybe we will have a better, more reliable solution.

If you purchased it as a hybrid card, I think that EVGA will want to warranty replace the entire thing. But I am not sure. If you purchased just the hybrid kit and installed it on the card, I think EVGA will want to just warranty replace the hybrid kit. It would be best for you to.contact EVGA directly via a support ticket against the registered product.

 
Hey Thanks for response, I purchased Hybrid card not Hybrid kit and I have 3 years warranty. Rma is a worst scenario in my case, because I should send my GTX 1080ti back, which I don't want to do
since "maybe" Pump have defectiveness. Can i buy Sc2 Hybrid kit and replace original water block on my GTX 1080ti card?