PC Processors

[Zlyzart]

I've seen benchmarks showing that the 7900 runs cooler than the 7700 on load when PBO is turned off amd-ryzen-9-7900-ryzen-7-7700-review and Ryzen 7000 non-X Review 

But I haven't been able to find anywhere what the idle temperatures and power consumption is when these CPUs are at Idle and/or at low usage.

I'm trying to plan out a quiet, cool, and power-efficient build and want to choose the one that uses less power when idle/at low usage. As it won't be too often that the system will be at full load.

[johnnyenglish]

Hi, the 7900 has two CCD with 6 cores and the 7700 has a single one made out of 8. There could be some instances where the CCD could be concentrating more heat than the other because of core count, but I would not take that for absolute certainty for all kind of loads.

If gaming is not your main deal maybe a 7600 non X would be a better deal. You'd have to tell us a bit more about what will you be doing with that build.

Regarding sound and temperatures, I mean, I have a almost dead silent 7950X with 35-40 at idle. So you also need to tell us if its going to be a full size tower, mid or mini ITX. That counts too.

Good luck 

[Zlyzart]

I want to build a passively cooled workstation PC with the Noctua NH-P1 cooler.
I plan on undervolting the CPU to reduce temps.

No gaming, no discrete GPU in fact. Will be used for software development on large code bases. So 'burst' work (building code) of ~1min at a time mixed with periods of lower use (coding).
The goal is to reduce build times as much as possible while maintaining acceptable thermals for the passive cooling.

[elstaci · Accepted solution]

Found this review on the Ryzen 5,7,& 9 7000 series 65 Watt TDP processors. On this page of the Review it shows the Idle and Load wattage for both of the processor you mentioned: https://hothardware.com/reviews/amd-ryzen-5-7600-ryzen-7-7700-and-ryzen-9-7900-65w-review?page=3

Sorry I can do a screenshot of the Idle/load chart since my GPU card is damaged and it will cause me to lose video output:

Ryzen 7 7700:

Idle - 89 watts

Load ( 1 core) - 112 watts

Load (All cores) - 177 watts

Ryzen 9 7900:

Idle - 104 watts

Load (1 core) - 126 watts

Load (All cores) - 177 watts

[Zlyzart]

Thanks, I guess the best I can expect. Just need to subtract the 3080s consumption.