likeshesaid
Hi everyone,
 
I have a few questions. I'm a 3D artist and I'm looking to eventually get 2x 3090s.
 
Questions:
1. How many slots do the hybrid 3090s take up? 
2. Anyone have experience with how 2x hybrid 3090s run in a Full Case?  

likeshesaid

kevinc313

likeshesaid
Hi everyone,
 
I have a few questions. I'm a 3D artist and I'm looking to eventually get 2x 3090s.
 
Questions:
1. How many slots do the hybrid 3090s take up? 
2. Anyone have experience with how 2x hybrid 3090s run in a Full Case?  

- Two slots, but 3 slot spacing is probably better. 
 
- I have not seen a dual 3090 Hybrid build yet, but clearly you're going to have a problem fitting dual 240mm rads plus a CPU aio.  Probably a Lian Li O11 XL or Air would be a good bet.

Yeah I have a Lian Li O11 XL right now. I was also considering switching my CPU to air cooling to minimize on the radiators. I have 4 PCIe slots so the cards would be sandwiched on 1 & 3 most likely unless I do some custom fitting. Was curious on the temps if anyone else has done a dual 3090 Hybrid build // how they have it set up. 

kevinc313

KingEngineRevUp

kevinc313

likeshesaid
Hi everyone,
 
I have a few questions. I'm a 3D artist and I'm looking to eventually get 2x 3090s.
 
Questions:
1. How many slots do the hybrid 3090s take up? 
2. Anyone have experience with how 2x hybrid 3090s run in a Full Case?  

- Two slots, but 3 slot spacing is probably better. 
 
- I have not seen a dual 3090 Hybrid build yet, but clearly you're going to have a problem fitting dual 240mm rads plus a CPU aio.  Probably a Lian Li O11 XL or Air would be a good bet.

The vast majority of the heat is extracted through the radiator. Also, the hybrid still uses the backplate and PCB from the FTW3 which has a pass through feature, so it shouldn't be an issue. I don't see anything bad happening sandwiching these cards together. 
 
I agree with the last part, he'll need a pretty damn big case. This is two 240mm radiators. 

 
Yeah I've got a 3080 FTW3 Hybrid and 2080 Ti with a Hybrid kit, so I'm pretty familiar with the layout.  But you made me consider the backplate - the 3090 has hot ram on the back against the backplate and that's going to be a SERIOUS issue with card #2 if it's right up next to card number #1.  There's just no way it's going to get enough air unless you have a fan mounted directly up against the gap, and then who knows if that will actually work.  I'd say it's a no go with two slot spacing.

CptT95
you could also go with custom loop cooling and buy the ftw3 block from Optimus for 3080/3090 this would give you maximum cooling with a full cover block and large backplate heatsink
the block works on all ftw3 3080/3090 since the basic design are the same for the PCB, just different coolers mounted on the front

Yeah I'd say custom loop with proper blocks if it has to be two slot spacing.

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp

kevinc313

likeshesaid
Hi everyone,
 
I have a few questions. I'm a 3D artist and I'm looking to eventually get 2x 3090s.
 
Questions:
1. How many slots do the hybrid 3090s take up? 
2. Anyone have experience with how 2x hybrid 3090s run in a Full Case?  

- Two slots, but 3 slot spacing is probably better. 
 
- I have not seen a dual 3090 Hybrid build yet, but clearly you're going to have a problem fitting dual 240mm rads plus a CPU aio.  Probably a Lian Li O11 XL or Air would be a good bet.

The vast majority of the heat is extracted through the radiator. Also, the hybrid still uses the backplate and PCB from the FTW3 which has a pass through feature, so it shouldn't be an issue. I don't see anything bad happening sandwiching these cards together. 
 
I agree with the last part, he'll need a pretty damn big case. This is two 240mm radiators. 

 
Yeah I've got a 3080 FTW3 Hybrid and 2080 Ti with a Hybrid kit, so I'm pretty familiar with the layout.  But you made me consider the backplate - the 3090 has hot ram on the back against the backplate and that's going to be a SERIOUS issue with card #2 if it's right up next to card number #1.  There's just no way it's going to get enough air unless you have a fan mounted directly up against the gap, and then who knows if that will actually work.  I'd say it's a no go with two slot spacing.

CptT95
you could also go with custom loop cooling and buy the ftw3 block from Optimus for 3080/3090 this would give you maximum cooling with a full cover block and large backplate heatsink
the block works on all ftw3 3080/3090 since the basic design are the same for the PCB, just different coolers mounted on the front

Yeah I'd say custom loop with proper blocks if it has to be two slot spacing.

Well I don't think the memory is going to go past 100C. At least some heat from the backside VRAM are going to be physically conducted away thanks to heat escaping on the die side to the VRAM plate, and the VRAM plate to the cold plate and AIO. 
 
And remember, the heat is still going into the backplate, and there is a pass through feature with shroud fan blowing air through the backplate 
 
https://www.techpowerup.com/review/evga-geforce-rtx-3090-ftw3-ultra/images/card2.jpg
 
https://www.techpowerup.com/review/evga-geforce-rtx-3090-ftw3-ultra/images/cooler4.jpg
 
So heat will leave the backplate still thanks to the pass through feature and the copper heat pipe bringing the backplate VRAM chips heat to those areas to escape and fly away. 
 
All in all, I think it'll be fine. I doubt it'll even reach 80-90C. 

Have you seen all the threads complaining about memory temps on the 3090?  Heck I just randomly watched a LTT video about a watercooled 3090 backplate.  On my 3080, going from top mount intake to exhaust with bonus case fans took my memory temps from above 100C to the mid-high 80's, and all those chips are directly cooled by the AIO copper plate.  On the 3090 you would expect tight spacing to be a problem, I would want to hear reports from people who have tried it.
 
The fan and pass through is nowhere near the memory chips and is operating unobstructed on single cards where people are already having issues.

kevinc313

KingEngineRevUp
 
 
 
Are you talking about all 3090s or are you talking about the FTW3 3090?
 
Also, a hybrid conducts a lot of heat away form the memory modules as well, and since the backside memory modules are in contact with the top memory modules, heat should be conducted away from there as well. 
 
The memory can go up to 100C without failing IIRC, I don't see it going up that high, specially if a lot of heat is going to be extracted from the AIO. 
 
Here are my test. I know this is for a 3080, but the way the hybrid is setup, it kept the memory 10-18C lower than the AIB setup as tested by GN:
 
https://preview.redd.it/wznvqlmabu461.png?width=4926&format=png&auto=webp&s=32802654f87b52df80d4c0c96c29bd828f856980
 
https://youtu.be/uG_xJ_rC3WE
 
My point is, a lot of heat will be dissipated via the AIO and cold plate, even the back ones because they are in contact with the top ones. 

Yeah, I'd read up on all the people complaining about 3090 memory temps, FTW3 or otherwise.

KingEngineRevUp
I haven't seen any complaints or issues with the hybrid though. That's what I'm asking you, are there post about the hybrid having issues? 
 
If the top modules are at 60C thanks to the hybrid cooling, I can't imagine the back memory modules being at 110C where they would start to throttle. Could there really be a 50C difference?

kevinc313

KingEngineRevUp
I haven't seen any complaints or issues with the hybrid though. That's what I'm asking you, are there post about the hybrid having issues? 
 
If the top modules are at 60C thanks to the hybrid cooling, I can't imagine the back memory modules being at 110C where they would start to throttle. Could there really be a 50C difference?

https://forums.evga.com/3090-Kingpin-amp-others-Get-that-backside-VRAM-cool-m3219773.aspx
 
https://forums.evga.com/3090-Hybrid-Cooler-higher-Memory-Junction-Temps-m3234655.aspx
 
https://www.google.com/se...+memory+junction+temps
 
Also, the front chips on my 3080 FTW3 Hybrid hit about 35C above core temp when operating at 445w average in Furmark, which is a light memory load. So about 84C at 50C core or 88-90C at 55C core.  Currently idling at 34C with a 24c core temp.  HWiNFO Memory junction temp which is the current preferred measurement, not ICX. It's a factory hybrid that has never been disassembled.

Attached Image(s)

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp
I haven't seen any complaints or issues with the hybrid though. That's what I'm asking you, are there post about the hybrid having issues? 

If the top modules are at 60C thanks to the hybrid cooling, I can't imagine the back memory modules being at 110C where they would start to throttle. Could there really be a 50C difference?

https://forums.evga.com/3090-Kingpin-amp-others-Get-that-backside-VRAM-cool-m3219773.aspx

https://forums.evga.com/3090-Hybrid-Cooler-higher-Memory-Junction-Temps-m3234655.aspx

https://www.google.com/se...+memory+junction+temps

Also, the front chips on my 3080 FTW3 Hybrid hit about 35C above core temp when operating at 445w average in Furmark, which is a light memory load. So about 84C at 50C core or 88-90C at 55C core.  Currently idling at 34C with a 24c core temp.  HWiNFO Memory junction temp which is the current preferred measurement, not ICX. It's a factory hybrid that has never been disassembled.

Interesting. I shared my memory results and chatted them vs fan speed. They average 50-60C. Not sure what's going on besides a botched install.

The thermal putty can have poor contact or not enough mounting pressure applied. I would advise those people to reinstall everything, roll the thermal putty back up and reapply it. Something is wrong with contact.

Yeah it sounds like you have amazing temps on memory or are not loading the card enough to see highish memory temps.  Maybe try the Furmark stress test with the same settings as mine and see what you get in HWiNFO mem junction (2560x1920, 2x MSAA, +90 core, +1000 mem, 118% PL, max fans, 445w average power).  I usually stay under 80C mem junction gaming. 
 
I've got a hybrid card from the factory and I've never taken it apart, so I don't know how well it's assembled.  From what I understand my mem temps are totally normal, maybe slightly good.  If I don't get my hands on a 3080 Ti, I might pull it apart for a repaste and pad upgrade.

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp
I haven't seen any complaints or issues with the hybrid though. That's what I'm asking you, are there post about the hybrid having issues? 

If the top modules are at 60C thanks to the hybrid cooling, I can't imagine the back memory modules being at 110C where they would start to throttle. Could there really be a 50C difference?

https://forums.evga.com/3090-Kingpin-amp-others-Get-that-backside-VRAM-cool-m3219773.aspx

https://forums.evga.com/3090-Hybrid-Cooler-higher-Memory-Junction-Temps-m3234655.aspx

https://www.google.com/se...+memory+junction+temps

Also, the front chips on my 3080 FTW3 Hybrid hit about 35C above core temp when operating at 445w average in Furmark, which is a light memory load. So about 84C at 50C core or 88-90C at 55C core.  Currently idling at 34C with a 24c core temp.  HWiNFO Memory junction temp which is the current preferred measurement, not ICX. It's a factory hybrid that has never been disassembled.

Interesting. I shared my memory results and chatted them vs fan speed. They average 50-60C. Not sure what's going on besides a botched install.

The thermal putty can have poor contact or not enough mounting pressure applied. I would advise those people to reinstall everything, roll the thermal putty back up and reapply it. Something is wrong with contact.

Yeah it sounds like you have amazing temps on memory or are not loading the card enough to see highish memory temps.  Maybe try the Furmark stress test with the same settings as mine and see what you get in HWiNFO mem junction (2560x1920, 2x MSAA, +90 core, +1000 mem, 118% PL, max fans, 445w average power).  I usually stay under 80C mem junction gaming. 

I've got a hybrid card from the factory and I've never taken it apart, so I don't know how well it's assembled.  From what I understand my mem temps are totally normal, maybe slightly good.  If I don't get my hands on a 3080 Ti, I might pull it apart for a repaste and pad upgrade.

Well note I'm also using ML120 fans and they were in push-pull. Also I was testing at 380W. =\ but the bigger thing is, my delta between my GPU and memory was never 30C, about 10C at most. So maybe some improvements can be done.

About the thermal putty. The thermal putty was pre-applied the plate, but that never made sense to me as a mechanical engineer that has drafted plenty of assembly drawings.

You blindly have to locate the plate onto the memory modules and hope it is centered... Without actually being able to see it.

I optioned to take the thermal putty off and applied it nicely centered onto my memory modules.

I also made sure to fasten what screws I could to the best of my ability.

I'm not sure how the stock Hybrids were put together though.

But in your case 80C is still not bad. What is it with your radiator fans at 100%?

Good tip about applying the pads directly to the memory chips.  Ample paste between the memory plate and AIO/Heatsink has been proven to be important too.  My tests are done with the stock FTW3 rad fans at 2900rpm plus 2x A12's at 2000rpm Push Pull top exhaust on a case fan hub with true 100% PWM plus other generic case intake fans MB header (53C result), and with 4x 120x38 San Ace server fans at 3400RPM push pull with 1/4" spacer plus A12 and Gentle typhoon case fans (50C result).  All sealed to the radiator with gaffing tape.
 
My temp delta has always been 25-35C under load, which is typical for most 3080.  So as you say it can likely be improved with optimal assembly. Somebody did an optimized install on an air cooled card a month or so ago on overclock net a few months ago with good results.
 
Just to be clear, you're taking the mem temp off HWiNFO memory junction temps, which was added in the last few months?

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp
I haven't seen any complaints or issues with the hybrid though. That's what I'm asking you, are there post about the hybrid having issues? 

If the top modules are at 60C thanks to the hybrid cooling, I can't imagine the back memory modules being at 110C where they would start to throttle. Could there really be a 50C difference?

https://forums.evga.com/3090-Kingpin-amp-others-Get-that-backside-VRAM-cool-m3219773.aspx

https://forums.evga.com/3090-Hybrid-Cooler-higher-Memory-Junction-Temps-m3234655.aspx

https://www.google.com/se...+memory+junction+temps

Also, the front chips on my 3080 FTW3 Hybrid hit about 35C above core temp when operating at 445w average in Furmark, which is a light memory load. So about 84C at 50C core or 88-90C at 55C core.  Currently idling at 34C with a 24c core temp.  HWiNFO Memory junction temp which is the current preferred measurement, not ICX. It's a factory hybrid that has never been disassembled.

Interesting. I shared my memory results and chatted them vs fan speed. They average 50-60C. Not sure what's going on besides a botched install.

The thermal putty can have poor contact or not enough mounting pressure applied. I would advise those people to reinstall everything, roll the thermal putty back up and reapply it. Something is wrong with contact.

Yeah it sounds like you have amazing temps on memory or are not loading the card enough to see highish memory temps.  Maybe try the Furmark stress test with the same settings as mine and see what you get in HWiNFO mem junction (2560x1920, 2x MSAA, +90 core, +1000 mem, 118% PL, max fans, 445w average power).  I usually stay under 80C mem junction gaming. 

I've got a hybrid card from the factory and I've never taken it apart, so I don't know how well it's assembled.  From what I understand my mem temps are totally normal, maybe slightly good.  If I don't get my hands on a 3080 Ti, I might pull it apart for a repaste and pad upgrade.

Well note I'm also using ML120 fans and they were in push-pull. Also I was testing at 380W. =\ but the bigger thing is, my delta between my GPU and memory was never 30C, about 10C at most. So maybe some improvements can be done.

About the thermal putty. The thermal putty was pre-applied the plate, but that never made sense to me as a mechanical engineer that has drafted plenty of assembly drawings.

You blindly have to locate the plate onto the memory modules and hope it is centered... Without actually being able to see it.

I optioned to take the thermal putty off and applied it nicely centered onto my memory modules.

I also made sure to fasten what screws I could to the best of my ability.

I'm not sure how the stock Hybrids were put together though.

But in your case 80C is still not bad. What is it with your radiator fans at 100%?

Good tip about applying the pads directly to the memory chips.  Ample paste between the memory plate and AIO/Heatsink has been proven to be important too.  My tests are done with the stock FTW3 rad fans at 2900rpm plus 2x A12's at 2000rpm Push Pull top exhaust on a case fan hub with true 100% PWM plus other generic case intake fans MB header (53C result), and with 4x 120x38 San Ace server fans at 3400RPM push pull with 1/4" spacer plus A12 and Gentle typhoon case fans (50C result).  All sealed to the radiator with gaffing tape.

My temp delta has always been 25-35C under load, which is typical for most 3080.  So as you say it can likely be improved with optimal assembly. Somebody did an optimized install on an air cooled card a month or so ago on overclock net a few months ago with good results.

Just to be clear, you're taking the mem temp off HWiNFO memory junction temps, which was added in the last few months?

No, the test was done awhile ago actually.

https://www.reddit.com/r/...rid_i_measured_my_gpus

I was doing the test and reading from iCX. Maybe my junction temperatures are higher then.

How much higher would they be?

Well that explains it. Junction temps are about 20C or so higher than ICX irrc.  Here's random test I found from a while back where I think I was top intake and normal gaming fan speeds, about 25C over the ICX mem temp.  So currently my temps with top exhaust should be pretty similar to yours, though yours could be slightly better.  Will post more later, am not up on my 3080 system right now because it's down for further fan config and a cpu repaste.
 
https://forums.evga.com/M...30803090-m3209894.aspx