Here is the BIOS updates to turn the card into a HYBRID. Each .zip includes 2 files. One for Normal BIOS and one for OC BIOS. Only install this update if the HYBRID kit is installed.
 
3080 FTW3 HYBRID Kit BIOS = https://www.evga.com/EVGA/GeneralDownloading.aspx?file=3080_FTW3_HYBRID.zip
3080 XC3 HYBRID Kit BIOS = https://www.evga.com/EVGA/GeneralDownloading.aspx?file=3080_XC3_HYBRID.zip
3090 FTW3 HYBRID Kit BIOS = https://www.evga.com/EVGA/GeneralDownloading.aspx?file=3090_FTW3_HYBRID.zip
3090 XC3 HYBRID Kit BIOS = https://www.evga.com/EVGA/GeneralDownloading.aspx?file=3090_XC3_HYBRID.zip
 
 
 
 

** edit contacted support and ran this as administrator with the system still up, i'm pretty sure the first time i used it it popped up and ask, but it did work and I have rebooted successfully.
 
 
just tried this on my card 3080 ftw3 ultra and used the OC bios in there and got this.
 

fixed above picture, also problem is fixed by running again as administrator

I've heard someone else had that problem as well, so best not to use those bioses just yet, for anyone else reading til we get more info imo.

jsteedman
Ugh not sure about the picture encoding:
 
ERROR: Invalid firmware image detected.
Please note this error and contact your display adapter manufacturer's
technical support line. It is important that you leave your system ON and NOT
reboot until instructed by your manufacturer on how to proceed.
Press any key to exit...

Not sure this might be the problem 

How does one install the BIOS from the zip? Do you just run the .exe or whatever is in there?

green4191
Do you have to reuse any of the original thermal pads? I'm worried I'll mess them up while I'm removing it and I don't even know the thickness but it says in the manual that you do reuse the thermal pads. I'm sure it's 1, 1.5 or 2 but I don't know. 

No, you don’t, just be careful taking the plastic off the new pads.

HawkOculus
How does one install the BIOS from the zip? Do you just run the .exe or whatever is in there?

Yes, via elevated prompt. I didn’t know there was a bios update. I didn’t do that for my 1080ti’s but they were also reference. I’ll have to try it out to see if it’s good in a bit. I’d like some info top as to what it does.

hows it performing in terms of temps? 

ctn2mb
hows it performing in terms of temps? 

I had an undervolt on it before to run at 2010 Mhz @ .925 mV, that with a decent fan curve kept it at 60-62 C during Port Royal.  Same settings with Hybrid kit never above 48.  We on a full volt OC +125 ram and +250 ram, it will get to 58.  VRM and Memory stays cooler than GPU, usually high 40's or low 50's with the "blower" fan at 40% static. Hottest point on the ICX is the top right power which is usually 1-2 C over the GPU so well in norms.  ALso the hybrid bios is only 400W, not 450.

I think the 2 big 140 mm fans I have blowing air up to it are helping some as well.