@Jsunn Check out my post where I did a near full coverage thermal pad and the improvements were great. My PC has been running constantly since I modified it and temps are still rock solid and same as day 1
 
https://forums.evga.com/FindPost/3437690

redteamgo
your setup looks amazing !!
 
have you had any issues running the HC block and the mp5works block in parallel?
 
I was actually just looking at the MP5works serial block yesterday but I paused because I wasn't quite sure how I would integrate it with different tubing sizes at different places in the loop.  it seems like the the 4mm tubing for the mp5works block would create a backflow problem if it was done in serial with 10/16 tubing everywhere else.
 
also, did you use the 3mm clips or the 6mm clips?  just asking to avoid buying replacement clips and having to ship them across the pond.

Thank you! I went with the parallel version due to the clean setup and low profile. My card is vertical and there isn't much space in the rear. Parallel appears to be working and keeps the VRAM super cool. I went with the 6mm clips but had to modify the backplate to make sure they bite. They even offer 8mm clips now. I would order the two sizes since they are so cheap. 
 
Here are more details about my build: https://sprungmass.com/element-29 If you scroll down to the "GPU Assembly" section on my build log it goes into detail about everything. 

I love! The copper super clean! If i ever do a liquid rig again its going to have the external rad for sure! Only seen 1 that blew even yours away but it was crazy even the frame was made out of copper tubing and was part of the cooling system! Still super awsome build!

I am excited, I just got my mp5works block.
 
Going to install this weekend I hope!  Its has a really nice feeling of heft to it and it has a preinstalled thermal pad.  Looks likeit will be very straight forward.

PR 20x run, before (left) and after (right).  Ambient was probably about 1C cooler last night during the before run.
 
GPU temp change is pretty nominal, HC block does a good job with that.  There are broad favorable changes to the temps.  GPU hotspot has always been my challenge.  The decrease isnt a ton but the stability is vastly improved.  Hotspot sits around 68-70 whether +mem is +0 or +mem is +1000, which is impressive.
 
The rest of the backside temps speak for themselves, especially PWR5.  I had some trouble with the clips like others have said.. so I kind of rigged it to the backplate with some velcro straps.. lol.  
 
I haven't had a chance to test the waters with +core yet.
 
 

 

 
 

 
 

Gotspeed, thanks for the feedback.  That is correct!  Temps are in Celsius.
 
But yeah lol those straps aren't pretty but they get the job done.  The block sits pretty tight to the backplate with very little play.  Unfortunately, the 6mm clips were too small.  I should have just bought them all.  I didn't want to clamp the cooler to the GPU either as the MP5works block has some curve to it and its only plastic... so I went with the straps.  They are easy to adjust and its just temporary .  I have some bigger clips coming so that should improve the appearance once in place.
 
The thing that really surprised me is that the GPU hotspot just kind of sits around 68-70C under 100% load without any overclock.  But then if I pop on a +100core/+1000mem, its still 70-72.  So that GPU Hotspot temperature vs GPU Temperature delta is really a headscratcher for me.  I have remounted the block 7 times at this point, have a full coverage backplate thermal pad and tried every kind of name brand thermal pad for the front (Gelid ultimate, gelid extreme, Thermalright, EVGA, optimus (fujiopoly), and I really just haven't gotten there.  So in that respect, I'm kind of at a loss.. but like you said it might just be a silicon lottery thing.  End of day, the card is still a rockstar so I can't complain too much

The 9th and final remount.  I outlined in white where you can see the nubs of the mp5works clips once the card is mounted back into the system.  I did end up removing the NVlink cap to get the top PCI backplate block clip a bit easier to get in place.  I might notch the NVlink cap at some point but right now, i'm indifferent.  I'm tapping out now, I'm satisfied and this probably isn't going to get much better than it is. 
 
If I were starting from scratch here is what I'd get:
 
* 2mm Thermalright odyssey pads for hydrocopper front
* 3mm Optimus full coverage pad for back
* 3mm Thermalright odyssey for inside of VRM area
* KPX thermal paste
* mp5works parallel block with 4 x 8mm clips
 
Avoid Gelid pads imo.  They are very hard and do not compress well at all.  Good luck peeps.  Below is where its at with this final remount.
 
 
 
 
PR 20x temperature highlights in C
Coolant: 30C
GPU1: 47.8C
GPU1 / Coolant Delta: +18C
GPU1 / GPU2 Delta: +1-2C
GPU Hotspot / GPU Memory Junction Delta : +3-5C
GPU Hotspot / GPU1 Delta : +15C
 
 
back:
3mm optimus thermal backplate
mp5works parallel block
4 x 8mm clips mounting the block
0.5mm pad from Mp5works block
 
front:
KPX thermal paste, finger spread evenly (not shown,sorry)
Thermalright 2mm on memory and VRM (VRM not shown, sorry.  Mounted directly to block)
Gelid ultimate 1.5mm x 2 stacked (3mm total) on area inside VRM
 


 


 

 

 

Yes, the 8mm clips catch the PCB.  no other way to do it AFAIK
 
you can either notch the backplate, loosen the backplate so that the hooks catch, or keep the backplate flush and use the big clips that will hit the PCB

should have my mp5works BPC here tomorrow

The 3090 Kingpin is pretty old now.. but wanted to update my latest changes.
 
I've replaced the thermal pads for vram and GPU coolers with honeywell phase change material (similar to what is being used in gaming laptops and the new 4090 FE cards).  I am using this in place of thermal paste.  Copper shims are being used instead of pads.  Initially, the temperatures were unimpressive, but now they are great!  It really does take some time for the phase change material to do its thing.
 
VRMs now are using Arctic TP-3 pads.  Much cheaper than Gelid and seem like they perform quite well.
 
Rear got the same treatment with Arctic TP3 pads and Honeywell phase change material + copper shims.  Added bonus: Heatpipe based heatsink instead of having a ton of fans and tiny heatsinks on the back of the card, I now have a 90 degree bend that removes heat from the back of the card with a large thermal pad via heat pipes, to an external heatsink that my case fan blows onto.
 
Temps under load/Idle:
https://imgur.com/a/whPzps2
 
Inside case:
https://imgur.com/8FIcycs
 
Outside case:
https://imgur.com/VK1n2GN
 
Overall, I'm happy with the temperatures.  Unfortunately, I must have not won the silicon lottery, as I am unable to do any significant overclocking without crashing/issues.