Ryzen 9 7950X performance to power limit scaling

21 Comments

1. The cooler used for this testing was a 360mm custom loop with liquid metal between the IHS and waterblock(not direct die).

2. WOW i'd love that performance at 75W!
   Going to 275W didn't even double the performance from 50W
   I find 75W or 100W the sweet spot for efficiency. Or even 50W but it's shame to underpower such a chip.

3. 275W are coolable if you have a steady and low cooling water temp of about 20C. CBR23 Runs will still be at about 80-82C for me at 280-300W. Using a MoRa and the TechN Waterblock for the 7950. Its not for normal people, buuuut you can do it if you heavily invest in cooling.🤣

   Although its not really useful in terms of performance gained. As you said, it just doesn't scale very well beyond 200W…i have my daily settings at 200W, maybe 230 depending on the Application and rather have CPU running at 70C max than pushing the limits. Only in Winter with 10C Water i'd do that…for lulz.😂

4. CN you please explain how you were able to lit power to 50w and if it's possible to go lower?

5. After extensive testing, I found 165w cTDP to be the sweet spot for my 7950x, resulting in; 38250 pts on c23, and all without breaking a sweat

6. Awesome job – addresses most all of the questions I had for this chip

7. I just built a 7950X 2 weeks ago. Stuffed up and ordered a Deepcool AS500 single fan cooler and used Hydronaut paste (thought I was buying the 2 fan model). CPU happily ran at 5.1GHZ avg all cores 205W 95C for days with ambient 20-25C after using the curve optimiser to undervolt the cores individually. CPU fan was nearly silent flat out, case fans were noisier. I got greedy and bought a 280MM AIO, and lo and behold, only 100-200MHZ boost at 230W over 200W. Way more noise, way more power consumption and a 2% boost in all core speed. So buy the Deepcool and be happy – just make sure you have good case fans pushing and pulling air around the CPU and use decent thermal paste. I did try boosting the Deepcool with a leafblower running the fan up to 2000RPM and couldn't get any more watts out of the deepcool – the AS500 is maxxed out at 200-205W 25C ambient. Anyone want to buy a 1 week old 280MM AIO??

8. 200watts is the sweet spot for me for cutting down rendering time while keeping the chip below 85° with my 420mm aio

9. I've never seen 37-38k r23 score when i set 175w limit… Its always 36.2k without any background app. But i can reach 38.200-38.600 scores when i left it default. I dont know how you can reach these scores at lower tdp… Maybe my chip doesnt like it and needs to be work at stock 225w, maybe thats why AMD set to be default 225w for all chips…

10. What is the ppt tdc edc values for 150w? I dont want to use eco mode, it gives me 34,5k R23 score, i want to achieve 37k with optimal settings.

11. With 3 x 120mm case fans in a Sliger 4u rackmount case with a Thermalright PA120 cooler I'm setting an 85c thermal limit on 7950x's and getting 38000 average CBR23/Multi scores after a 30 minute test run. Dropping a 5-pack of Arctic P12 PWM PST fans in place of the 5 total fans in the case and cooler drops the noise levels substantially but isn't necessary for my application. While spot checking HWinfo64 data it seemed like it was running near the 185w mark. I checked the same setup at 75c the score only dropped between 500-1000 points but seemed to settle in at a 150w average which is in-line with the data points here. Point being – you don't even need to throw an AIO at this, a $42 air cooler is completely adequate for an x7950.

12. ayo，cinebenche38597 at 200w it’s pretty good, The max I got at 204w is 38325. Did you do any turning or it’s just a solid cpu

13. Is setting a power limit a simple thing laymen can do? I haven't owned amd since the duron

14. I may have missed it, is the power shown here the PBO limit set in BIOS or HWINFO readings or some actual measurements? Thanks!

15. Your stuff is excellent. Would it be possible to explain, or provide a link, on how to arrive at the PBO values for each power limit. I have only been able to find 65, 105 and 170 watts. Thanks for your frank and educational material.

16. undervolted at 150 seems like the best option

17. I'd like to osee 16 cores at 35W (maybe even 15W! That would start to really affect even single core performance though, wouldn't it?)

18. 75-100W if gaming, 150-175W if doing productivity. Say 125W if you don't have extreme productivity requirements, as a decent (and decently coolable) sweet spot for reasonably efficient productivity and gaming. Or about half of the default. What is AMD thinking, with those defaults?

19. Did you also happen to measure the powerdraw? Cause from my experience up to the 5xxx series AMD had forced some hard power-limits.

20. So what you're saying is cool it as best you can, undervolt and let it do what I can and if you want to limit the power it won't kill performance.

    I still don't know why AMD pushed these so hard power wise.

21. maksimum en fazla 250w için ne ağladınız be…