P870DM2_DM3 QTJ1 stock/max TDP results

[JamieTheAnything]

10 minutes ago, 1610ftw said:

 

Are you sure you won't destroy the vapor chamber by doing that?

It wont because the only difference between the dual GPU TM and DM is the thing that sticks out into the channel for the CPU 

[runix18]

3 hours ago, JamieTheAnything said:

Do you mind listing the types of caps that are needed, thankfully I do know a thing or two about soldering, and I dont mind doing so if it means I can pull more than 110-ish watts consistently. Right now the current limit is the heatsink and if someone could help out with what wattage is the limit between the DM(2/3),KM, and finally the TM CPU coolers.

At 105.5~ watts its getting pretty close to the limit of the CPU heatsink however I hope that the TM heatsink will help out with that regard.

(as for the mod to the Dual GPU heatsink I plan on just using some Guitar string to help cut the extended heatsink off of the dual GPU vapour chamber unless other people have other solutions)

22 uF 0805 X5R 6.3 VDC Multilayer Ceramic Capacitors MLCC - SMD/SMT

[1610ftw]

3 hours ago, runix18 said:

Tbh, I do not remember how many watts of power I managed to pull out of the board on the CPU side but, when I did the TM Cpu mod I did populate the under socket with all the missing caps on the pads. I was able to push the 9700K/9900K (I had both) to 4.5 Ghz al time. I was not limited by power consumption, rather I was limited by thermals.

 

That is pretty impressive! The CPU of the P870 always suffered from its stock heatsink that was an afterthought compared to the massive cooling that was available for the GPUs. With a decent 9900K I would figure about 110 to 125W at 4.5GHz which in everyday use is pretty sustainable from my experience with the P870TM even when it is not the greatest heat sink.

[JamieTheAnything]

Unfortunately, I have installed the new cooler and it had zero net improvement.

 

 

 

however I did figure something else out to help in getting under 100 watts of load.

 

 

 

 

i had the damn cache multiplyer set to 44

 

 

setting it to the default (21x)results in being able to get up to 4.4 GHz all core without thermal or power throttling.

 

 

however it does have a considerable dip in performance compared to all core at 44x at 4.2 GHz vs 21x at 4.4,

1800 vs 1650 in CB 15

 

 

 

im tired.

[1610ftw]

Do you have a pic of the cooling section?

All cores have similar temps?

Also try a more regular cache like 40.

 

[runix18]

11 hours ago, 1610ftw said:

 

That is pretty impressive! The CPU of the P870 always suffered from its stock heatsink that was an afterthought compared to the massive cooling that was available for the GPUs. With a decent 9900K I would figure about 110 to 125W at 4.5GHz which in everyday use is pretty sustainable from my experience with the P870TM even when it is not the greatest heat sink.

Even dough I had the TM heatsink, I was still on the 5V fans (old DM) not 12V fans.

[1610ftw]

2 hours ago, runix18 said:

Even dough I had the TM heatsink, I was still on the 5V fans (old DM) not 12V fans.

 

True, the fans were never that great and this is obviously because initially both CPUs and GPUs were not intended to consume that much power. Also the CPU heatsink just wasn't in the same class as the GPU heatsink(s) even though the later CPUs could easily consume as much power as the 1080 or the 2080.

 

[JamieTheAnything]

9 hours ago, runix18 said:

Even dough I had the TM heatsink, I was still on the 5V fans (old DM) not 12V fans.

Odd thing about mine, It actually had all 12V fans. and It's a DM2_DM3 *I think the DM3 is the dual GPU version which is what I have.

 

[JamieTheAnything]

11 hours ago, 1610ftw said:

Do you have a pic of the cooling section?

All cores have similar temps?

Also try a more regular cache like 40.

 

Yeah I ended up hard mounting it since one of the screws decided to cease holding, so I used 4 screws from a cisco switch I took apart and hard mounted it because otherwise it wasnt making ANY contact.

 

[JamieTheAnything]

What I'm more than likely going to do is just limit it to 75 watts and up the single core performance to improve gaming.

All core idk anymore, just sticking it to 85-97 watts or something to get an all core 4Ghz while undervolted and with the cache at 40x is what I'll deal with.


 

[1610ftw]

When all 8 cores are semi active you may need still need to allow something like 4.4 all core in order to allow the higher clocks in gaming while limiting power via for example Throttle Stop, best to experiment a bit.

 

When my son was using the P870TM for gaming we settled on 4.6 GHz all core as otherwise clocks would go down in gaming even when the game was only using 6 or less cores and in the end the goal was just to stay below 85C for most of the time with even short bursts never exceeding 95C. You could start off with something like 75 or 80W and 4.4 GHz all core clock and see how it goes but I think that even 90W should not be an issue if you do not run it non-stop.