My 2080 Ti XC Gaming used to run in the mid 70s while gaming with memory overclocked 700 MHz and the GPU overclocked 170 Mhz with other sliders maxed.  Lately it runs in the mid 80s, the fans are a bit loud.  I've bought the card new from EVGA, I've had it maybe 8 months.  I *think* the temperature increase began the end of December when I upgraded from Precision X1 0.3.12 to 1.0.2.0.  I'm wondering if something in that update could have caused the change I am experiencing.  I had changed nothing else and have proceeded to try tweaking the case fan speeds, changing case fans, replaced thermal paste twice all with no resolution.  Anyway, I'm confident I have positive pressure, not sure what changed and what to do to resolve.  I have been resisting water cooling but I am thinking that is the next step.  Any advice is appreciated.
 
System Specs:
Case: EVGA DG-76
CPU: 9700K
CPU Cooler: Dark Rock Pro 4
Mobo: EVGA Z390 FTW
GPU: EVGA 2080 Ti XC Gaming

Okay, case fans at 100 and side off.  room temp is about 72 or 74 F.  Seems to stabilize around 79 or 80 C.
 
Just playing games I normally play, mostly Apex Legends, settings maxed with 3440X1440.
 
I'll loop Timespy for a bit and see what happens and report back.

Not bad ... room 23 C is on the warmer side ... though above 75C seems warm for you GPU
 
What Voltage are you using while the benchmark runs ?  Did you set a voltage curve or "lock voltage" ?
 
What monitor - refresh & resolution do you have ?
 
Point a small fan at your open case, see if temps drop
 
All filters in case are clean & GPU cooler is clean - no dust bunnies ?
 
You say you reapplied the TIM.  How experienced at that are you ? 

When you removed the cooler was the TIM covering the entire GPU Die?

Undo the Max slider on the voltage & see if temps drop & how much - if OC not stable lower you OC on GPU
 
Run GPU-Z & look at the sensor tab while you benchmark
 
Might have been a Windows update or Nvidia driver update ... causing higher temps ?

Maybe the cooler has become warped.

What brand of TIM did you use ?
 
When you disassemble you look at the contact to establish cooler was sitting flat on Card:
 
1) TIM spread ... GPU, you want the entire Die covered - look at contact pattern on both Die & cooler
 
1a) during assembly, not trapping air bubbles & getting the cooler 100% flat on the GPU die
      installing all screws - do not tighten them just start them, so you know cooler is properly aligned with PCB
       Then slowly tighten screws in "X" pattern, a little at a time, working the "X"  -  starting with those 4 closest to the GPU die
 
2) Contact pattern on the Thermal Pads is also examined to establish that there is proper contact
 
        Nice photos in this for proper contact --->  How to correctly apply the thermal interface material (TIM)? - ekwb.com
 
It is just a little odd, that your temps changed before your first TIM change & the pattern from the TIM was good when disassembled
 
Yes, water cooling has its advantages.  Just make sure you have plenty of radiator for your system - Might be tough or impossible in that case
 
Temps below 85 C are still OK - GPU may start to throttle @85C (Nvidia Boost 4.0)
 
89C is the Max for the GPU
 
DG-7 Case supports 3 Front fans, 3 top fans & 1 in back of case:  What is your setup ? Fan, Location, blowing In or Out
 
TESTs: 
Remove your OC from your CPU.  What does the GPU temps look like ?
 
Remove front panel (do you have 3 fans in front) - I'm not sure, how much room for airflow it has --> What does the GPU temps look like ?

Cool GTX
What brand of TIM did you use ?
 
When you disassemble you look at the contact to establish cooler was sitting flat on Card:
 
1) TIM spread ... GPU, you want the entire Die covered - look at contact pattern on both Die & cooler
 
1a) during assembly, not trapping air bubbles & getting the cooler 100% flat on the GPU die
      installing all screws - do not tighten them just start them, so you know cooler is properly aligned with PCB
       Then slowly tighten screws in "X" pattern, a little at a time, working the "X"  -  starting with those 4 closest to the GPU die
 
2) Contact pattern on the Thermal Pads is also examined to establish that there is proper contact
 
        Nice photos in this for proper contact --->  How to correctly apply the thermal interface material (TIM)? - ekwb.com
 
It is just a little odd, that your temps changed before your first TIM change & the pattern from the TIM was good when disassembled
 
Yes, water cooling has its advantages.  Just make sure you have plenty of radiator for your system - Might be tough or impossible in that case
 
Temps below 85 C are still OK - GPU may start to throttle @85C (Nvidia Boost 4.0)
 
89C is the Max for the GPU
 
DG-7 Case supports 3 Front fans, 3 top fans & 1 in back of case:  What is your setup ? Fan, Location, blowing In or Out
 
TESTs: 
Remove your OC from your CPU.  What does the GPU temps look like ?
 
Remove front panel (do you have 3 fans in front) - I'm not sure, how much room for airflow it has --> What does the GPU temps look like ?

First try I  used Arctic Silver 5.  Then I tried Thermal Grizzly Kryonaut which is what is on there right now.  
 
Great tips on TIM spread and assembly.  I will find a time this weekend to reapply Kryonaut.
 
Yes, it just happened one day.   I played around with the fans A LOT and even bought some different ones to try out.  Then I got to thinking maybe the TIM dried out.  I will try undoing my CPU OC and see what happens.   
 
Three front fans are intake at high rpm, top fans exhaust at low rpm, back fan exhaust at high rpm.
 
I always have the front panel removed.   Once I reapply TIM I'll remove CPU OC and report back the results.

cfemrite

Cool GTX
What brand of TIM did you use ?
 
When you disassemble you look at the contact to establish cooler was sitting flat on Card:
 
1) TIM spread ... GPU, you want the entire Die covered - look at contact pattern on both Die & cooler
 
1a) during assembly, not trapping air bubbles & getting the cooler 100% flat on the GPU die
      installing all screws - do not tighten them just start them, so you know cooler is properly aligned with PCB
       Then slowly tighten screws in "X" pattern, a little at a time, working the "X"  -  starting with those 4 closest to the GPU die
 
2) Contact pattern on the Thermal Pads is also examined to establish that there is proper contact
 
        Nice photos in this for proper contact --->  How to correctly apply the thermal interface material (TIM)? - ekwb.com
 
It is just a little odd, that your temps changed before your first TIM change & the pattern from the TIM was good when disassembled
 
Yes, water cooling has its advantages.  Just make sure you have plenty of radiator for your system - Might be tough or impossible in that case
 
Temps below 85 C are still OK - GPU may start to throttle @85C (Nvidia Boost 4.0)
 
89C is the Max for the GPU
 
DG-7 Case supports 3 Front fans, 3 top fans & 1 in back of case:  What is your setup ? Fan, Location, blowing In or Out
 
TESTs: 
Remove your OC from your CPU.  What does the GPU temps look like ?
 
Remove front panel (do you have 3 fans in front) - I'm not sure, how much room for airflow it has --> What does the GPU temps look like ?

First try I  used Arctic Silver 5.  Then I tried Thermal Grizzly Kryonaut which is what is on there right now.  
 
Great tips on TIM spread and assembly.  I will find a time this weekend to reapply Kryonaut.
 
Yes, it just happened one day.   I played around with the fans A LOT and even bought some different ones to try out.  Then I got to thinking maybe the TIM dried out.  I will try undoing my CPU OC and see what happens.   
 
Three front fans are intake at high rpm, top fans exhaust at low rpm, back fan exhaust at high rpm.
 
I always have the front panel removed.   Once I reapply TIM I'll remove CPU OC and report back the results.

OK, looks like a plan

I just used kryonaut and was not too happy with results ( it was put on properly ).
Ripped that stuff off and used Arctic Silver .
Much better temps .

thanks for the update
 
I use MX-4 TIM --> works good, does not dry & is not expensive