I have 3mm pads on backplate mem and vrm on 3080 hybrid. 26ºC on everything except gpu1 which is 24ºC right now.. its at idle though.
 

 
edit: uploaded pic

skyline090
I have 3mm pads on backplate mem and vrm on 3080 hybrid. 26ºC on everything except gpu1 which is 24ºC right now.. its at idle though.

Do you mind sharing your heatsink-side setup assuming you changed anything from stock whether the hybrid was a kit or came like that? Same thickness pads all around makes sense, but based on the references I've seen (or misunderstood) some of them do use different thicknesses for the backplate VRAM and VRM.

Hoopladoodle

skyline090
I have 3mm pads on backplate mem and vrm on 3080 hybrid. 26ºC on everything except gpu1 which is 24ºC right now.. its at idle though.

Do you mind sharing your heatsink-side setup assuming you changed anything from stock whether the hybrid was a kit or came like that? Same thickness pads all around makes sense, but based on the references I've seen (or misunderstood) some of them do use different thicknesses for the backplate VRAM and VRM.

 
I did not change any of the pads that came on the front side of the PCB. I have inquired with evga tech support regarding the size padding that comes on the hybrid kit, but they were not sure. I was advised to call back in a few weeks.
 
here is what the backside looks like after applying the pads.

 

 

 

 
 

They do not compress all that well i admit. These are 6w/mk pads. I've read that Gelid are even harder. I personally don't think they are worth it though, unless you can really get some pressure on them.
 

Yeah that's not the greatest compression for sure. Should definitely be better then that.

so if 3mm make backplate bend we better go with 2mm pads ?
 
You guys should put a fan there.. You apply a heat transfer but you need to take away the heat. From what i see in this thread 3mm is too thick for the gap. 

 thanks! Great post 

Final update for a while, please see the bottom of the main post for why I'm throwing in the towel. 
Thank you for reading and hope to update the fixes sooner rather than later!

Hoopladoodle
Final update for a while, please see the bottom of the main post for why I'm throwing in the towel. 
Thank you for reading and hope to update the fixes sooner rather than later!

 
Wow.. so I will definitely not be trying any of this with my 3090 FTW3 Ultra.  Thanks for trying it and warning us.
 
 

Thanks for sharing what you found. I struggled for a couple weeks as well with thermal pads.

I think the only answer is going full waterblock once you break the seal on the FTW3. Makes you wonder what the heck we are going to do when it comes time to sell these cards for 4090s.