Was planning on vertically mounting an EVGA 3090 ti FTW Ultra hybrid using a Link-Up Extreme4+ PCIe 4.0 x16 Riser Cable in a Enthoo 719  case. Has anyone done this already? Are there issues I should worry about?
Thank you in advance for any constructive feedback. 

The Phanteks Enthoo 719 case is immense. After doing some more looking found that Phanteks has an updated PCIE Gen 4 vertical GPU bracket and cable combo (PH-VGPUKT4.0_03) to replace the Gen 3 assembly (PH-VGPIKT_02) listed in the Enthoo 719 case manual. It is also 1/2 the price of the Link-Up Extreme4+ PCIe 4.0 x16. This should allow some breathing room versus mounting card in the bottom of the case. Still waiting on parts to arrive, based on listed numbers it should fit... 

Nereus
 
I'm a little surprised EVGA doesn't offer riser cables in their store.
 

Probably can't make a profit on them. Most of them you see online run around $60.

Mine won't fit well in my case that way. Even if my case is massive big card will hit front glass.

So.. all parts came in... Things did not turn out as expected, as imagined anyway. There was a youtuber doing a review on the Phanteks 719 case and he that indicated that it was made for custom loops and not really for AIO solutions, but that that would be an interesting build video.. Well I did not make a video putting this together but there would have been a lot of editing if I had. The Strix LC II 360 cooler for CPU is taking up the top mounting section of the case and the 3090ti hybrid technically fits in the "mid" vertical mount position using the Phanteks riser solution. I have some reservations about the 3090ti hybrid radiator height/position. EVGA supplies a nice little insert with their 3090ti hybrid cooling solution indicating that the radiator should be above the item being cooled with the hose connections down.. I understand it is undesirable to have cavitation due to air in the pump, so my question is how much fluid is actually in the system/radiator? If the radiator cannot be entirely above card (mine is currently mounted vertically not horizontal) can the fluid level be high enough (above pump) in radiator to prevent any issues. I ran the new system for a day or so without the Hybrid card installed while I milled over how this build was not working out as I had planned. The system has ran for another couple of days now with 3090ti hybrid card installed doing benchmarks etc. with no issues and very impressive temps (<60ºF) despite my overclocking attempts on video card, the upper vertical mount keeps card away from side panel enough for air flow. The layout is not as I had hoped but it looks like it will do. Once again, constructive comments are welcome.
 

rfk-13dr
So.. all parts came in... Things did not turn out as expected, as imagined anyway. There was a youtuber doing a review on the Phanteks 719 case and he that indicated that it was made for custom loops and not really for AIO solutions, but that that would be an interesting build video.. Well I did not make a video putting this together but there would have been a lot of editing if I had. The Strix LC II 360 cooler for CPU is taking up the top mounting section of the case and the 3090ti hybrid technically fits in the "mid" vertical mount position using the Phanteks riser solution. I some reservations about the 3090ti hybrid radiator height/position. EVGA supplies a nice little insert with their 3090ti hybrid cooling solution indicating that the radiator should be above the item being cooled with the hose connections down.. I understand it is undesirable to have cavitation due to air in the pump, so my question is how much fluid is actually in the system/radiator? If the radiator cannot be entirely above card (mine is currently mounted vertically not horizontal) can the fluid level be high enough (above pump) in radiator to prevent any issues. I ran the new system for a day or so without the Hybrid card installed while I milled over how this build was not working out as I had planned. The system has ran for another couple of days now with 3090ti hybrid card installed doing benchmarks etc. with no issues and very impressive temps (<60ºF) despite my overclocking attempts on video card, the upper vertical mount keeps card away from side panel enough for air flow. The layout is not as I had hoped but it looks like it will do. Once again, constructive comments are welcome.
 

With my KPE hybrid it did feel and sound like there was a little air in the loop. More than I'd like. I had mine mounted tubes down on the side o11d xl mount. And with the bad luck I've had with my brother and another friends hybrid card pumps going out on the 3080 and 3080 ti hybrids I wouldn't take any chances.

rfk-13dr
So this is how it is currently set-up..
 

Should be fine. Exactly how my KPE is set up.

That's a lot of case for what you have in it.  Your build I think will be fine as it is.  The rads have capacity above the pumps so in theory any air that develops in the closed loops should end up in those gaps rather than the pumps.  You have so much space that in your build you have all your fans on the rads exhausting which is fine imo based on what you have in your pc.  I would consider adding fans to either the bottom or both the front and bottom to aide in air flow.  It might not help much but atleast it would help pull air into the case through the filters rather than the back area near the I/O shield which does not have screens.  You have a ton of unused space there in the front and bottom.  

Testing with an image… Is inserting a link from imgur the way to do it?