Does anyone know the EVGA 3090 XC3 THERMAL pad sizes? I seem to not be able to find a straight solid answer without mixed answers. Is the front and back different thermal pad sizes? Please just need straight answers as I am sure others are wondering..

EVGA said 2.25mm for memory and 0.75 for inductors.... Not possible to find really

I would assume the spacing is close to the same as on the FTW3 card, 2.2mm on the VRAM and 2.8mm on the VRM with putty on the inductors as a space filler.  I picked up K5 Pro off of amazon from the Inductors myself, as I really don't to leave them bare when I put my original shroud back on.

Also looking for this information.
The 3090 XC3 Ultra board is smaller than the FTW3 so it's likely their thermal pad configuration is not exactly the same.
I've seen posts about thermal pad sizes for the 3090 FTW3 and Kingpin but none about the XC3 Ultra.
Can someone please give us the pad thicknesses for the 3090 XC3 Ultra?

Can't you just go off what ek supply with their blocks?

Hi, do we know how many w/m does the origianal EVGA Thermal Pads are?
I was thing to change them to 8w/m thermal pad... or should I buy from ebay 12,8w/m thermal pad?

yo

Bi2Lmet
Thanks, yes, I know that the 12,8 is better, is just my local supplier only got 8w/m... So I was wondering if it's worth to change it with the 8w/m. You know, if EVGA got e.x 3w/m it worth the try, but if EVGA's pads are 7-8w/m it doesn't worth the try.

I would say to go for as high as you can

I'm still working on this. The odd pad thicknesses that evga used and the type of pads used (they used softer, squishier, compressible) plus thermal putty, is making this mod a pain. I'm not getting full contact still so waiting on more thermal material to come in. I'll update my findings when I get it all together.
 

Alright adding a fan to the heatsink helps BIG TIME in removing the heat from the back-VRAMs.  My temps have now dropped from avg 104-106 to 96-98. 
 
 

 
I think this can be improved. My heatsink stays warm but the backplate of the card is still hot hot hot! I think the thermal tape sitting between the heat sink and the backplate doesn't have a very high thermal conductivity rating so I'm not cooling the VRAM fast enough.  I'm going to see if i can get more heat transferred to the heat sink using some thermal pads in conjunction with thermal tape.  Have to place an order for the 0.5mm thermal pad so will continue to update my findings when it comes in.

Bi2Lmet
Pretty nice... it wasn't what I was expecting but if works for you that's good.
My card works with temperatures 102-106c so I don't think that I need to change the pads.
I thought that it will give you at least bellow 100c... but it depends the watts. Really how much consumptions in watts do you have to get temp. 102-106c ?
For me it's 272w - 280w, anything above 280w will give me temp 106c ++ 

Yeah the card will run with temp 102-106 but I'd definitely prefer to keep it lower to reduce the stress/damage from long-term heat.
For 104-106, this was with power limit at 365W and fans at 100%

some of you guys gonna get sued by EVGA for disclosing thermal pad sizes !!!!.. getting ASUS flashbacks..

New update! Getting better temps by reworking the heatsink+fan mod.
 
From the previous thermal mod I did above I was getting 100deg @ 90% fan, power limit 365W, actual ~300W)
 
I wasn't satisfied with the temp I was getting as I wanted to run this with quieter fan at 80% or less but then the temp would shoot past 100deg. There was a LOT of heat on the backplate and my heatsink+fan setup was warm but not crazy warm.  I had covered the entire backing of the heatsink with thermal tape but I think this is where the weak link was. The thermal tape I have is rated at ~2.0 Wk/h. In fact, most if not all thermal tape you find is 2.0 or less... the heat transfer is not very good compared to thermal pads. If it was possible, I'd cover the entire heatsink backing with thermal pads but the problem is that thermal pads are not sticky enough to keep heavy things like heatsinks in place for a long time.
 
My solution: Do the best of both worlds.
 
1. I removed the heatsink -- the thermal tape was real strong and stuck REALLY hard onto the backing. It warped the backplate of the card when I finally removed it... which leads to step #2
2. Test for good backplate contact (see below for the story)
3. Applied 0.5mm thermal pads directly over the spot where the 2.0mm thermal pads lie on the bottom-side of the backplate. About roughly same dimensions, didn't have to be perfect.
4. Added 2 additional small pads which sit beside the vertical pads (see photo below, the 2 of them on the heatsink). Not sure if this is useful but my thought was that would help heat transfer from the copper spreader (you'll see it on the underside of the backplate where the 2.0mm pads are) 
5. Of course make sure none of the thermal pads you put on will layer over another once you put the heatsink back on 
6. Applied 2 layers of thermal tapes in the corners (2 layers because the thermal tape I use is 0.25mm, so 2 layers will make it 0.5mm which matches the height of the thermal pads). They won't have enough surface area to really absorb much heat, but then again they're only 2.0Wk/h which is nothing compared to the thermal pads. Their purpose is mainly only to keep the heatsink in place.
 
The thermal tape I used - search on Amazon: 
AIYUNNI Thermal Adhesive Tape 10mm by 25M,Double Sided Thermally Conductive Tapes,Cooling Tape for Heat Sink,SSD Drives,Computer CPU,GPU,LED,Coolers 
 
The blue in the photo are the thermal tapes. You can't see it but there's two layers there.  The grey ones are the 0.5mm thermal pads -- 2 of them are on the heatsink and 4 are on the backplate
 

 
I mentioned that when I first removed the heatsink, I had warped the backplate a bit such that parts of the backplate sitting above some of the 2.0mm thermal pads were curved up a little and no longer fully contacted the pads. Without knowing, I put the heatsink and all back together again and when I tested it, my temps kept increasing past 100 again and I was quite confused. Tore everything apart and checked the backplate... sure enough, I noticed the problem and I rebent the plate so that it pressed down onto the pads.
 
Even though I had accidentally bent it, you probably won't make the same mistake as me. But I think it's a good idea for you to just double check that your plate has good contact regardless. With reasonable force, press down with your finger on each area that has a 2.0mm pad on the bottom-side of the backplate. It should not flex. It should not give.  If it is not moving, then you have solid contact.
 
With the new heatsink+fan mod, I am now getting:
 
During mining overclock power limit 365W, memory 10700
92deg @ 90%fan
94-96deg @ 80% fan
 
 
 
 

@dracore, what hash rate do you get with that setup?
 
do you have thermal pads over more than the memory on the back?  I see gray through the backplate holes.

@dracore thanks for the information!
 
Do you think it was worth it or did anything with replacing the thermal pads on the GPU side?
 
I am thinking of returning most of them to amazon since I have not opened any but the 2mm.
 
For your hash rate, was there particular settings you used?  Any 'undervolting' or other tweaks?   I have only seen mine hit 110-111 when I reset the settings and of course the mem chips shoot to 108+C.