Looking for advise on configuring the i9-13900ks with an ASUS z790 Hero.

[Aus_Karlos]

Hey guys looking for some advise to try and keep the 13900ks from hitting the high 90c (Not in benchmarks) and if I should keep the 64GB DDR5 at its XMP profile of 6400mhz (hearing that some CPU memory controllers start to cry).

So my Rig has a custom liquid loop of 2x 460mm Rads from EK and they estimate about 750W heat dissipation which also contains a full block 3080TI. The CPU block is the Velocity 2 from EK.

 

Idle temps in the rig are fine usually around 30-35c (I live in Australia with terrible Evap and its currently 28c in the room). From past experience CPUs that have a sudden spike in temp usually indicate poor contact with the cooler or not enough thermal paste. However triple checking the thermal application and the water block I can safely say its not the issue. And usually when the CPU does hit 90-100c (In cinebench) the rads are pumping out a lot of heat.

I've disable the ASUS multi-core enhancement (disabled - Intel Spec only) but the power draw on the CPU is still insane topping out at 320W with a voltage draw of 1.45v. Which should i tackle first, is there a setting in the BIOS to limit the CPUs power draw more to control the temp or should i undervolt or will this cause issues when under full load?

 

Thanks.

[CommanderAlex]

4 hours ago, Aus_Karlos said:

From past experience CPUs that have a sudden spike in temp usually indicate poor contact with the cooler or not enough thermal paste. However triple checking the thermal application and the water block I can safely say its not the issue. And usually when the CPU does hit 90-100c (In cinebench) the rads are pumping out a lot of heat.

Do the temps spike instantaneously?? It almost sounds like due to the shape of the IHS and CPU retention frame, you may need an aftermarket one. 

 

Something similar to this one from thermal grizzly or another brand. 

 

[Aus_Karlos]

14 hours ago, CommanderAlex said:

Do the temps spike instantaneously?? It almost sounds like due to the shape of the IHS and CPU retention frame, you may need an aftermarket one. 

 

Something similar to this one from thermal grizzly or another brand. 

 

The temp doesn't immediately spike to 100c it takes a few seconds and its usually only the cores that hit 6ghz the rest sit at about 97c.

However i've been tweaking the BIOS settings, ive disabled (thats enabled by default) the "Unlimited ICC....." something setting that allows the CPU to pull as much current as needed (ASUS defaults this to 500A wow). I've also locked the P1 and P2  states to a maximum draw of 280W. This seems the sweet spot for my CPU, it still allows 2 cores to boost to 6ghz and the others to 5.6ghz and this maintains the CPU temps to around 85-89c and obviously as im limiting the total power draw the full load voltage of the CPU core has dropped from 1.45v to 1.4v.
Running Cinebench i've only lost ~300 points which is a decent trade off for reducing the power by 40W.

[CommanderAlex]

Just now, Aus_Karlos said:

The temp doesn't immediately spike to 100c it takes a few seconds and its usually only the cores that hit 6ghz the rest sit at about 97c.

However i've been tweaking the BIOS settings, ive disabled (thats enabled by default) the "Unlimited ICC....." something setting that allows the CPU to pull as much current as needed (ASUS defaults this to 500A wow). I've also locked the P1 and P2  states to a maximum draw of 280W. This seems the sweet spot for my CPU, it still allows 2 cores to boost to 6ghz and the others to 5.6ghz and this maintains the CPU temps to around 85-89c and obviously as im limiting the total power draw the full load voltage of the CPU core has dropped from 1.45v to 1.4v.
Running Cinebench i've only lost ~300 points which is a decent trade off for reducing the power by 40W.

That's pretty damn absurd setting to have enabled by default (I guess with XOC board it will do this, provided cooling is capable). That's a lot better than before and I believe with an undervolt, this will lower temperatures slightly more, but at a point where instability may occur if too low.

[Aus_Karlos]

So i was playing around with the ASUS AI Overclock, there seems to be a nasty bug in BIOS version 0813 on the ASUS z790 Hero. I reviewed the settings for what they AI was going to run the CPU at and it looked promising. 4 cores at 6.2ghz and the other 4 at 5.9ghz and the E-cores untouched. It was aiming for a Vcore of ~1.42v on all the cores with an Adaptive cap of 1.46v. However once in Windows I noticed that on a partial load all the cores had a voltage of 1.53v, idle was ~1.2v and Full load was 1.28 - 1.38v, some decent Vdroop there. (If only the P-Cores where loaded the vCores settle around 1.45v)

I also noticed that while the core temps where staying below the 90c package threshold under full load and it TDP was targeting ~280W it had overridden the Unlimited ICCMAX setting to set the CPU current to 511.2A which seems completely unnecessary.

[Shzzit]

Intel stock is 253 watts, so if it’s going over that your not at stock settings.  
 

Sounds like you need a contact frame, I am able to cool a KS with a LT720 360 AIO and it keeps it under 100c in cinebench. So with your setup it should cool it fine. 

[Aus_Karlos]

On 2/6/2023 at 2:12 AM, Shzzit said:

Intel stock is 253 watts, so if it’s going over that your not at stock settings.  
 

Sounds like you need a contact frame, I am able to cool a KS with a LT720 360 AIO and it keeps it under 100c in cinebench. So with your setup it should cool it fine. 

Its pretty much solved. My CPU runs at the same speeds at 280W as it does at the default 320W power profile. It seems the z790 Hero sets everything to max by default been overly generous on Current and voltage which caused the huge jump in temperatures. Probably because its primarily an overclocking board. Going into the BIOS and tweaking almost every setting I can achieve ~94c as the highest peak temp in Cinebench with 4 Pcores at 6.2ghz and the other 4 at 6ghz, all the Ecores at 4.9ghz with only a 280W power budget. Cinebench is a synthetic load so no real world workload would your CPU be hitting this 24/7. During gaming it averages 50c, and when using Handbrake to encode its around 75c.

[Shzzit]

2 hours ago, Aus_Karlos said:

Its pretty much solved. My CPU runs at the same speeds at 280W as it does at the default 320W power profile. It seems the z790 Hero sets everything to max by default been overly generous on Current and voltage which caused the huge jump in temperatures. Probably because its primarily an overclocking board. Going into the BIOS and tweaking almost every setting I can achieve ~94c as the highest peak temp in Cinebench with 4 Pcores at 6.2ghz and the other 4 at 6ghz, all the Ecores at 4.9ghz with only a 280W power budget. Cinebench is a synthetic load so no real world workload would your CPU be hitting this 24/7. During gaming it averages 50c, and when using Handbrake to encode its around 75c.

Nice bro, that sounds much much better then before.  Glade you got it fixed.

 

I did 4 cores 6ghz 4 cores 5.6 and e cores down to 43.  Seems to work good with my AIO.