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Air cooling a Ryzen 9 5900x?

Donnie Fisher said:
I run a 5800x with a prism. Disabled PBO etc and just set the multiplier to 44. The system will sit mid 80’s under all core load at 4.4ghz and not throttle. Sits high 30s at idle.

I don’t need the all out max speeds that pBO offers and just wanted good stability which I seem to have


I imagine the 5900x would be similar.
Click to expand...

Is that 4.4ghz all core in prime95 avx?
 
Just cinebench runs. I’m not into running benchmarks to be honest as a means of trying to always push the boundary.

The hardest I’ll push my machine is generally with blender and video rendering. Cinebench was a quick and dirty test close to what I would use the machine for which got me to a stable place where I can sustain a render / encode on the cpu if I want and be happy I’m not throttling when doing so.

I will add I’m using an x470 board so I don’t think the whole Pbo stuff is super reliable on it in my personal case, and I didn’t have the time to go fiddling to get a few mhz of boost. There may have been a few other settings I changed in the bios, but either way it runs stable on a prism cooler.

Could it be quieter … with a different cooler yes, but when it’s what you have, it’ll do !
 
So thats not gonna be a truly stable system.

I use a x470 board too, I use a 5600x and with a 100w power limit it does 4.25ghz all core in prime. It averages 4.5ghz all core in cinebench and handbrake x265 encoding. Lighter gaming loads will see it run at 4.65ghz all core.
It runs at around 80c in prime95 i could raise power limit higher to around 115w but im not comfortable with temps sustaining close to 90c although throttle point i believe is 95c.
 
I’ll try prime 95 and see what happens. As for being stable, it hasn’t crashed for me, so to me and what I’ve used it for, it’s stable enough. Granted that may be different for other peoples use.

Edit:

Tried Prime95, and you're right, it cant sustain 4.4 without blowing a gasket temp wise. I ditched the set multiplier and re-enabled PBO, but set a temp limit of 90°C. Prime95 sustains 4.1 for me, and cine 4.3 across the cores on my prism cooler when limited to 90°C.

I'll leave it setup this way for a while and see whether its stable or not. ( previous PBO enables have been a bit troublesome before for me )
 
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Donnie Fisher said:
I’ll try prime 95 and see what happens. As for being stable, it hasn’t crashed for me, so to me and what I’ve used it for, it’s stable enough. Granted that may be different for other peoples use.

Edit:

Tried Prime95, and you're right, it cant sustain 4.4 without blowing a gasket temp wise. I ditched the set multiplier and re-enabled PBO, but set a temp limit of 90°C. Prime95 sustains 4.1 for me, and cine 4.3 across the cores on my prism cooler when limited to 90°C.

I'll leave it setup this way for a while and see whether its stable or not. ( previous PBO enables have been a bit troublesome before for me )
Click to expand...
Why not just run clock tuner for ryzen? It will undervolt it and knocked the temps down. Took my 5800x from 80+ into the 60s at 4.6ghz
 
Have to tried to run without pbo? Run cpu at stock speeds but experiment raising the power limiter to boost all core performance. That way you dont get high voltage spikes trying to get higher clocks for lighter loads. Stock should be 105w, run prime and i think your cpu should be at 3.7ghz all core at 105w. Keep upping the wattage till your cooling cant handle it.
 
Had another mess about with PBO/PPT/TDC/EDC/CO which resulted in crashes here there and everywhere. So I've now left it with: PBO enabled. curve optimiser -10 on all. Limits left to default. Max temp set to 90°C. Which gets me:

Cine multi - 4.45ghz all core throttling at 90°C ( score hovers about 15000 )
Cine single - unable to tell freq - temp 60 to 70°C ( score ~1600 )
Prime95 - 4.2 all core holding at about 85°C

Cyber-Mav said:
Have to tried to run without pbo? Run cpu at stock speeds but experiment raising the power limiter to boost all core performance. That way you dont get high voltage spikes trying to get higher clocks for lighter loads. Stock should be 105w, run prime and i think your cpu should be at 3.7ghz all core at 105w. Keep upping the wattage till your cooling cant handle it.
Click to expand...

I dont seem to be able to access those settings in the bios without enabling PBO to manual. Would I need to go through Ryzen master then ?
 
I did it all in bios. Pbo is on manual to get those settings available.
You will get to a point of diminishing returns. The cpu at stock 105w is tuned well for efficiency. Going to 200w wont give you double the performance, its more like 20-25% more performance.

If it was my 5900x id probably target it to around 150w to get a multi core boost and have temps still remain in low 80's. That way its voltages should remain under 1.35v in any load situation.
 
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