I have a RTX 4070 super. Temps are 40-50 in any dungeon or raid of any size. Load is at 20-30%. on xavius my load is at 100% and temps rocket to 85-90. this only happens on this boss and only on legion timerunning. Any other content or fights is zero problems. drivers and so on are up to date.
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I also noticed my GPU fans go turbo mode a little after mobs were pulled in that boss arena.
I just did Xavius on all difficulties and monitored the GPU with GPU-Z on my 2nd display.
GPU load did indeed double and then some as soon as the trash mobs spawned and combat started.
Fans went up from 30% (base) to max 41%, but this is on a 4090 FE 
Can you please check on non-remix retail Xavius on Mythic, if it is just Xavius in general or Remix version ?
I don’t have sub, and PTR is offline, yes you can go the first raid on lvl20 “trial”.
if your fans/heat bother you, workaround is that you set max foreground FPS to 20, and after fight bring it back to +60
if you want it as in-game commands:
/console useMaxFPS 1 <=this one turn on the max foreground FPS
/console maxFPS 20
/console maxFPS 60
I don’t think it’s even a big deal.
Trash + boss fight is like 2-3min.
Might be annoying but it’s not gonna hurt your fans.
Im not sure sure about my gpu usage, but u know how there is that like dark mist or something in xavius area ?( cant describe it properly) well in remix i see it with blue line lile a glitched graphics , every single that im there on that exact spot , it looks the same.
On retail it looks just normal , so there is definotely something wonky going on
I just did my daily raids and checked for a blue line or any other glitches in the Xavius fight.
None for me.
GPU usage goes up for no reason though. Doesn’t before the first trash wave spawns, so it’s not the fog particles (they often cause issues when compute effects and particles are to too high.
Yeah, 4090 on Xavius draws 520 watts xD (usually it is 80-300 watts). There is also a place in Suramar, in Ambervale, where the same thing happens - only when you look in a certain way, on a certain spot - something is bugged there.
There’s many of these spots where you can max out your GPU cause of the compute effects or particles that are unoptimised.
520W? You should really set a power limit in MSI Afterburner, set it to like 70% and it will save you alot of power and only lose like 10% FPS or less.
nah, my power is infinite, our numbers are endless, bow before the might of the burning legion!
This is already after undervolting 
(but the power limit is not limited, and only those unoptimized spots in wow can put this load on the card). Either way, I not really “care”, just give my experience (put the “life” to the topic), to maybe will be seen by someone who can do something in dev team because, this can fook up some “bad cards” like cinematic in d4 or main menu new world.
My GPU always goes to 100% on this fight in remix when the mobs are pulled but not on the retail version (fully updated rtx 3070 on 1080p monitor and mid settings) and 50% of the time my pc crashes (screen just goes black but i can hear sound still, only way to fix is a hard reset)… I just end up avoiding this boss
why didn’t you do the /console useMaxFPS 1 , /console maxFPS 20 , /console maxFPS 60 ?
I did test it on 11.2.7 PTR, and even there the Xavius was ok
I did notice in Legion Remix phase 1, that even Broken Shore is the first version from 7.0.x-7.1.x
that means every phase, they will bring back the bug fixes from Legion too
so maybe phase2 or phase 3 Xavius will be fixed
and probably that’s why they still didn’t fix it, because the new phases have the fix
we will see