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.