amelius

I've never had screen tearing issues, nor stuttering, nor game not launching. I've had a few times where performance games weren't great, but supposedly the new nvlink sli bridge helps with that a lot and most games scale at least 50%, which is good enough for me. 
Is it cost effective? Only if you can't upgrade any further. given how my system's specs are
TR 2990WX, Titan V, 2x 2080Ti, i really don't have anywhere else to make performance gains. 

Agreed, especially in a custom water cooling loop like I have it, with UV reactive fluid. 

I've never had screen tearing issues, nor stuttering, nor game not launching. I've had a few times where performance games weren't great, but supposedly the new nvlink sli bridge helps with that a lot and most games scale at least 50%, which is good enough for me. 
Is it cost effective? Only if you can't upgrade any further. given how my system's specs are
TR 2990WX, Titan V, 2x 2080Ti, i really don't have anywhere else to make performance gains. 

Well, in this case, a fair number of users on different forums had the exact same, reproducible issue, and all of them had sufficient PSUs. This also occurs with Titan V's in combination with RTX cards. 
 
Also, several tests by techtubers have shown that SLI scaling with the new nvlink bridge is substantially better than old SLI bridges, resulting to 80% or higher scaling in quite a few things, which seems worth it. 
 
Additionally, I'm guessing that people who had this issue with RTX + Titan V configurations (like myself) are using these cards as budget machine learning cards, since they have tensor cores. That's a good reason to have a multi-gpu setup, however, in this case, even having the GPUs plugged in, with no bridge, results in the motherboard failing to post, with an error "OE Load VGA Bios". While each GPU separately works fine, when the others are disabled. 

Just to clarify, other X399 platforms were confirmed to work by several users, including other Asus boards, the issue is exclusive to the flagship X399 board, the ROG Zenith Extreme. Additionally, since it seems the board is fine with supporting each GPU when the other is disabled, and only has this issue when two GPUs are used at once, would lead me to think it's not a hardware but a software issue, since the physical hardware for each slot and working with these GPUs works fine, just the POST check fails for some reason. 

Agreed, especially in a custom water cooling loop like I have it, with UV reactive fluid. 

I've never had screen tearing issues, nor stuttering, nor game not launching. I've had a few times where performance games weren't great, but supposedly the new nvlink sli bridge helps with that a lot and most games scale at least 50%, which is good enough for me. 
Is it cost effective? Only if you can't upgrade any further. given how my system's specs are
TR 2990WX, Titan V, 2x 2080Ti, i really don't have anywhere else to make performance gains. 

Agreed, especially in a custom water cooling loop like I have it, with UV reactive fluid. 

I've never had screen tearing issues, nor stuttering, nor game not launching. I've had a few times where performance games weren't great, but supposedly the new nvlink sli bridge helps with that a lot and most games scale at least 50%, which is good enough for me. 
Is it cost effective? Only if you can't upgrade any further. given how my system's specs are
TR 2990WX, Titan V, 2x 2080Ti, i really don't have anywhere else to make performance gains. 

Agreed, especially in a custom water cooling loop like I have it, with UV reactive fluid. 

Agreed, especially in a custom water cooling loop like I have it, with UV reactive fluid. 

I know that I want an SLI build because it looks better aesthetically.
 
Seriously, my 1080ti look so lonely atop my Asrock Supercarrier Z270 board.
 
It's dumb I know, but SLI config's just look better aesthetically.

Again this HEAVILY depends on the games, some tech tubers test like 2-5 games, which can heavily skew results. Look at hardware unboxed testing of 30+ games. Its a wide range of benefit. It certainly SHOULD be better then sli, but my point still stands. your paying 2x, in this case $2400+ for 20-80% performance depending on someone elses ability to code and willingness to code. 
 
It very well could be a shitty board setup, Just from a Tech repair and service guy it can be a bit finicky with new hardware and drivers, what is wrong with each board etc. Wouldnt be the first time

You could just say all 4 are going into the workstation...

a) Upgrade right now, just the case
 
cases don't really go out of date, and don't usually break