undervolting vs reducing power budget on Ryzen 3700X

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mcb
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Joined: Sat Aug 24, 2002 10:24 pm
Location: San Francisco

undervolting vs reducing power budget on Ryzen 3700X

Post by mcb » Fri Jul 26, 2019 5:25 pm

The most interesting thing in this article https://adoredtv.com/zen2-chiplet-quali ... d-by-cost/ was a chart generated by a Twitter user showing how Cinebench R20 multithreaded performance varied on a 3700X when undervolting and reducing the PPT limit.

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I played with this a bit on my 3700X. PBO doesn't affect 1T peformance. For multi-threaded performance:

"stock" 88W - 4747, cpu voltage 1.2-1.225, 3.95-3.98 GHz at 74 deg C and 90W total package power
PBO on - 4847, cpu voltage 1.31-1.32, 4.05-4.08 GHz at 83 deg C and 110W
PBO reduced to 48W - 3653, 0.925 volts, 3.13-3.15 GHz at 53 deg C and 50W
PBO reduced to 64W - 4371, 1.05 volts, 3.73 GHz at 61 deg C and 65W

All on stock cooler for now.

CA_Steve
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Re: undervolting vs reducing power budget on Ryzen 3700X

Post by CA_Steve » Sat Jul 27, 2019 5:14 am

Nice find.
1080p Gaming build: i5-4670K, Mugen 4, Asrock Z97 Anniversary, MSI GTX 1660 Gaming X, 8GB 1866 RAM, Samsung 860 Evo 500GB, Crucial MX100 256GB, WD Red 2TB, Samsung DVD burner, Fractal Define R4, Antec True Quiet 140 (2 front + rear) case fans, Seasonic SSR-550FX. 35W idle, 45-55W video streaming, 170-200W WoW, 318W stress test (Prime95 + Furmark)

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