Recommended voltages for 7800X3D

[nguyen]

Well I just built a SFF rig for my gaming buddy with 7800X3D + 4080 Super.

What are the recommended voltage settings for 7800X3D running 2x16GB 60000Cas36 G.Skill? I will set for best thermals possible.

 

[oxrufiioxo]

Well I just built a SFF rig for my gaming buddy with 7800X3D + 4080 Super.
View attachment 356048

What are the recommended voltage settings for 7800X3D running 2x16GB 60000Cas36 G.Skill? I will set for best thermals possible.

All 3 I worked with ran pretty cool but all 3 were in larger cases with a 360 aio..... All I would do is find out what curve optimizer settings it likes some like as low as negative 30 There are plenty of youtube videos that would go into better detail than me.

 

[tabascosauz]

I'm not sure what you mean by best thermals possible, as the uncore voltages within reason don't really affect thermals much and RAM would obviously depend on what you test to be stable. And CO is also impossible to say as there is known appreciable variances from chip to chip. Also not confident enough to say if CO alone can create massive temp reductions as it once did on 5800X3D.

VSOC as low as possible without penalizing performance of any kind or causing iGPU artifacting or other problems. Probably looking at somewhere between 1.0-1.2V for 6000. Using iGPU actively for display output affects VSOC requirements. The FCLK you want to run can also affect your choice of VSOC (both the way you'd expect, but also possibly inversely as high VSOC can inhibit stable high FCLK).

VDDIO_MEM_S3 can start at 1.25V as a safe estimate I think. 1.35V is also fine for me but idk if that's a generally safe recommendation.

Don't think VDD_MISC needs to budge from 1.1V usually

afaik VDDP is similar to on AM4 and can stay at 0.9-1.0V in normal use case.

DDR5 voltages should work the same way as they do on Intel.

 

[nguyen]

I'm not sure what you mean by best thermals possible, as the uncore voltages within reason don't really affect thermals much and RAM would obviously depend on what you test to be stable. And CO is also impossible to say as there is known appreciable variances from chip to chip. Also not confident enough to say if CO alone can create massive temp reductions as it once did on 5800X3D.

VSOC as low as possible without penalizing performance of any kind or causing iGPU artifacting or other problems. Probably looking at somewhere between 1.0-1.2V for 6000. Using iGPU actively for display output affects VSOC requirements. The FCLK you want to run can also affect your choice of VSOC (both the way you'd expect, but also possibly inversely as high VSOC can inhibit stable high FCLK).

VDDIO_MEM_S3 can start at 1.25V as a safe estimate I think. 1.35V is also fine for me but idk if that's a generally safe recommendation.

Don't think VDD_MISC needs to budge from 1.1V usually

afaik VDDP is similar to on AM4 and can stay at 0.9-1.0V in normal use case.

DDR5 voltages should work the same way as they do on Intel.

Well I will probably underclock the CPU by 200mhz to lower thermals


Just tried CP2077 at 1080p and it is reaching 80C, I will try to lower it to 70C

Since I build for somebody else, playing it as safe as I can

 

[Toothless]

Probably needs more airflow but other than that it looks like everything is within spec. Just use the poor thing.

 

[oxrufiioxo]

Well I will probably underclock the CPU by 200mhz to lower thermals
View attachment 356049

Just tried CP2077 at 1080p and it is reaching 80C, I will try to lower it to 70C

Since I build for somebody else, playing it as safe as I can

Anything under 89c is more than fine those cpus just automatically boost based on cooling in my experiences they all run in the high 70s low 80s no matter what cooling you throw at them... Some of it probably just comes down to lottery in how flat the ihs is.

Cyberpunk is a pretty good test though it's decently cpu heavy especially with RT.

I usually loop timespy gpu test 1 with cinebench r23 for 2 hours and take down the averages... extreme maybe but I like it as a worst case scenario.

 

[JWNoctis]

Well I will probably underclock the CPU by 200mhz to lower thermals
View attachment 356049

Just tried CP2077 at 1080p and it is reaching 80C, I will try to lower it to 70C

Since I build for somebody else, playing it as safe as I can

You might have better success lowering wattage limits, which won't impact single thread performance within reasonable limits, though that would produce somewhat-lower-than-expected multicore benchmark rating, so look out if that matters.

A low VSOC should help as @tabascosauz mentioned. The IOD+IF could indicate upwards of 20W even in idle. If anything, it would leave more TDP budget to the core chiplet.

 

[fevgatos]

Well I just built a SFF rig for my gaming buddy with 7800X3D + 4080 Super.
View attachment 356048

What are the recommended voltage settings for 7800X3D running 2x16GB 60000Cas36 G.Skill? I will set for best thermals possible.

You can run those ram at 6000c30-34-34-34-58 + 65k trefi at 1.435v. It's the samsung dies right?

 

[nguyen]

Disabling boost clocks and curve optimizer -20

4080 Super also run at lowest voltage possible at 900mV

Looks like temps are good, room temp at 33C atm

You might have better success lowering wattage limits, which won't impact single thread performance within reasonable limits, though that would produce somewhat-lower-than-expected multicore benchmark rating, so look out if that matters.

A low VSOC should help as @tabascosauz mentioned. The IOD+IF could indicate upwards of 20W even in idle. If anything, it would leave more TDP budget to the core chiplet.

Oh I will try setting lower TDP instead of disabling boost, 4200mhz would probably hurt single core perf.

You can run those ram at 6000c30-34-34-34-58 + 65k trefi at 1.435v. It's the samsung dies right?

Yes It's samsung Bdie, overclocking or lowering CAS don't work :/, tREFI 65k would cause instability when sphub temp is above 50C, I will try for 1.35V DDR to lower temp though

 

[fevgatos]

Yes It's samsung Bdie, overclocking or lowering CAS don't work :/, tREFI 65k would cause instability when sphub temp is above 50C, I will try for 1.35V DDR to lower temp though

Yeah overclocking for sure doesn't work on those dies, but tightening down the timings should be possible. Maybe it's the platform difference, had them on Intel and 6000c30 was pretty easy.

 

[tabascosauz]

Disabling boost clocks and curve optimizer -20
View attachment 356068

Temps lookin' good

No need to really worry about the CPU temps at all, 7800X3D keeps itself in check pretty well. If it never breaks 80C, then I just wouldn't even bother to look at the temp at all. Doesn't run quite as cool as 5800X3D in games but it's no problem at all

 

[AusWolf]

SoC Voltage shouldn't exceed 1.35 V, but with 6000 MHz RAM, you're good to go anywhere between 1.2 and 1.3 V. Everything else should be fine on Auto.
Nice setup, btw!

 

[Blaeza]

Damn those Peerless assassins are everywhere, lol. Great cooler!

 

[Chomiq]

Damn those Peerless assassins are everywhere, lol. Great cooler!

Count the number of heatpipes again.

 

[Blaeza]

Count the number of heatpipes again.

Obviously, I was wrong.

 

[Taraquin]

The most important is curve optimizer and ppt. Find best curve values using occt avx2 extreme. I got around 800 points mote in cinebench R23 going from stock to -36 avg CO so about 5%. Ppt of anywhere from 60-80W if there is too much noise/throttling.

SOC will probably work at 1.0-1.2v. Find lowest. Vddp at 0.9-1.1v. vddio at 1.1-1.25v. vdd18 to 1.6-1.7v, vdd misc may work at 1.0v. vddgs at 0.8-0.9v.

Example of the latter:
- Soc 1.29v, vddp 1.15v, vdd18 1.8v, vddio 1.35v
Idle consumption 22-26W
- Soc 1.08v, vddp 0.99v, vdd18 1.6v, vddio 1.24v
Idle consumption 15-19W, load 15W lower in cinebench R23.

 

[SN2716057]

Things I did to temper my 7800X3D, things might sound/look different so a little searching in the bios is needed;
Precision Boost Overdrive: from auto to Advanced
Curve Optimizer: All Cores
All Core Curve Optimizer Sign: from Positive to Negative
All Core Curve Optimizer Magnitude: 0-30 (start with 30, run benchmarks, if CTD lower the number, mine is set at -15)
Platform Thermal Throttle Control: from Auto to Manual
Platform Thermal Throttle Limit: 80 (in Celsius) or whatever you're comfortable with
PPT Limit [mW]: max cpu wattage. I have not touched this but you can change it to let's say 85000 [= 85 Watts]

With these my sig rig does not run higher than 80 degree Celsius. And I can still play Crysis

 

[nguyen]

The most important is curve optimizer and ppt. Find best curve values using occt avx2 extreme. I got around 800 points mote in cinebench R23 going from stock to -36 avg CO so about 5%. Ppt of anywhere from 60-80W if there is too much noise/throttling.

SOC will probably work at 1.0-1.2v. Find lowest. Vddp at 0.9-1.1v. vddio at 1.1-1.25v. vdd18 to 1.6-1.7v, vdd misc may work at 1.0v. vddgs at 0.8-0.9v.

Example of the latter:
- Soc 1.29v, vddp 1.15v, vdd18 1.8v, vddio 1.35v
Idle consumption 22-26W
- Soc 1.08v, vddp 0.99v, vdd18 1.6v, vddio 1.24v
Idle consumption 15-19W, load 15W lower in cinebench R23.

Thanks for your suggestions, I set SOC at 1.1V and it has been stable thus far with 6000Cas36 RAM.

Do you have any weird errors without crashing with CO set too low? like WHEA errors?

If performance is not significantly reduced I would disable single core boost and run all-cores 4.2ghz, I will do some gaming benchmarks to check.

 

[Taraquin]

Thanks for your suggestions, I set SOC at 1.1V and it has been stable thus far with 6000Cas36 RAM.

Do you have any weird errors without crashing with CO set too low? like WHEA errors?

If performance is not significantly reduced I would disable single core boost and run all-cores 4.2ghz, I will do some gaming benchmarks to check.

If CO is set to low you get instant reboot, no bluescreen.

 

[Klemc]

I'll try CPU Boost OFF, playing LiS 2 and True Colors (RT)

 

[nguyen]

Wait this is looking pretty funny
Cyberpunk 2077 1080p High
Core boost disabled, all cores 4.2ghz, CO -30


Core boost enabled, 65W PPT, CO -30


Not only all cores 4.2ghz gives higher avg FPS, but also much higher 1% Low FPS, about 15C cooler and 20W less

Cyberpunk 2077 probably doesn't care about clocks but rather the Cache

Edit: with Core Performance Boost disabled, CO disabled the performance is way way higher. Look like Curve Optimizer might be detrimental to performance

 

[Klemc]

Wait this is looking pretty funny
Core boost disabled, all cores 4.2ghz, CO -30
View attachment 356089

Core boost enabled, 65W PPT, CO -30
View attachment 356090

Not only all cores 4.2ghz gives higher avg FPS, but also much higher 1% Low FPS, about 15C cooler and 20W less

For me it's 79 to 50°c

IDK... i've XMP OFF

Wait this is looking pretty funny
Cyberpunk 2077 1080p High
Core boost disabled, all cores 4.2ghz, CO -30
View attachment 356089

Core boost enabled, 65W PPT, CO -30
View attachment 356090

Not only all cores 4.2ghz gives higher avg FPS, but also much higher 1% Low FPS, about 15C cooler and 20W less

Cyberpunk 2077 probably doesn't care about clocks but rather the Cache

Edit: with Core Performance Boost disabled, CO disabled the performance is way way higher. Look like Curve Optimizer might be detrimental to performance
View attachment 356093

Beware if you installed 560.70, bc i had 90 to 120 FPS in CP2077 befor GPUBoost OFF, i tested bc some user reported it in 3DGuru forum

 

[nguyen]

For me it's 79 to 50°c

IDK... i've XMP OFF


Beware if you installed 560.70, bc i had 90 to 120 FPS in CP2077 befor GPUBoost OFF, i tested bc some user reported it in 3DGuru forum

What is GPU Boost? I overclocked+undervolt the 4080Super to 2520mhz/900mV so GPU clocks stay fixed the entire time

 

[Klemc]

What is GPU Boost? I overclocked+undervolt the 4080Super to 2520mhz/900mV so GPU clocks stay fixed the entire time

No, a typo, it's CPU Boost, my iGPU is OFF too in the BIOS. it's good on x3d chip gets cooler( i think it's the cache tho).

 

[Taraquin]

Wait this is looking pretty funny
Cyberpunk 2077 1080p High
Core boost disabled, all cores 4.2ghz, CO -30
View attachment 356089

Core boost enabled, 65W PPT, CO -30
View attachment 356090

Not only all cores 4.2ghz gives higher avg FPS, but also much higher 1% Low FPS, about 15C cooler and 20W less

Cyberpunk 2077 probably doesn't care about clocks but rather the Cache

Edit: with Core Performance Boost disabled, CO disabled the performance is way way higher. Look like Curve Optimizer might be detrimental to performance
View attachment 356093

Could be unstable CO resulting in performance degredation.