PC Processors

[sacharja]

Hi everyone,

I just bought a Ryzen 7 3700X. I disabled Core Peformance Boost & Precision Boost Overclock and undervolted via offset by -0,1V, result when using prime95:

- uses 45W CPU Package Power (AIDA64) after 5min (awesome)
- uses 53W CPU Package Power afer 15min (stable)
- jumps suddenly to 76W CPU Package Power after 20min, temp jumps from 70°C to 89°C and increases slowly to 95°C (throttling starts)

Anyone else who realized these "jumps" of CPU Package Power past the TDP under longer heavy load? Will this be fixed with the next AGESA update?

Greetz

[shinkojiro]

That is Because the package power limit of 65w processors is actually 88w, and for 95 and 105w processors it is 142w. This is just AMD allowing the processors to operate at somewhat higher all-core frequencies out of the box. You can power limit it right to 65w in Ryzen Master however, if you were to enable PBO and change the PPT to 65 or 95/105w for your processor. You will then will be running in the Pre-Zen 2 AMD spec.

A double edge sword, it was, as many people dont expect this behavior from AMD processors, only intel. Your processor isnt going to overheat either way so long as you are running with Default or PBO enabled.

[sacharja]

>You can power limit it right to 65w in Ryzen Master however, if you were to enable PBO and change the PPT to 65 or 95/105w for your processor. You will then will be running in the Pre-Zen 2 AMD spec.

That worked, pretty cool. Thanks

BTW: seems PPT with the values 65 & 45 is stable (everything in between was unstable for me). Throttles just shortly to 3,3Ghz & 2,5Ghz.

[shinkojiro]

I can see it getting wonky with some PPT limits. I would stick with 65w, 88w, or 10000w/something your board will never reach :3

[sacharja]

Seems I undervolted a bit too much, but now everything is rock solid.

After 5h prime95:

1. AGESA 1.0.0.4B

2. Undervolted offset mode -0.9 (resulted in 1.000V)

3. PPT set to 55W

4. 77°C passivley cooled, average 3.2Ghz ( Thermalright Le Grand Macho RT )

Absolutely amazing and exactly what I need. No more wait time until a low wattage model will be released, PPT is awesome.

[mstfbsrn980]

Your processor comes with 65W TDP and a 95°C temperature limit. The CPU does not come with 65W TDP limit. If your processor came with a TDP limit, there would be no OC feasibility. You can set a TDP limit with the BIOS of your motherboard. Prime95 application also pushes these limits (TDP temperature etc... ).