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Ryzen 7 5800U thin and light laptops should offer stellar single-core performance as AMD's Zen 3 APU scores higher than an Intel Core i9-10900K in CPU-Z

The Ryzen 5000 mobile APUs could be officially announced in January at CES 2021. (Image source: AMD/PC Gamer)
The Ryzen 5000 mobile APUs could be officially announced in January at CES 2021. (Image source: AMD/PC Gamer)
An AMD Ryzen 7 5800U has been delivering some curious results thanks to recently leaked CPU-Z and Cinebench benchmarks. Single-core and single-thread scores were incredible, to the point that the laptop Ryzen 7 5800U could even outscore a desktop Intel Core i9-10900K. However, there seemed to be an issue with the Cezanne APU’s multi-core performances.
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The AMD Ryzen 7 5800U is an upcoming Ryzen 5000 series mobile APU based on Zen 3 architecture, and therefore it is classed as a Cezanne chip and should offer greater performance than its fellow Lucienne Zen 2 parts (that are basically a Renoir Refresh). A sample has appeared on both CPU-Z and Cinebench, as reported by Uniko’s Hardware (in Chinese; via VideoCardz). The single-thread and single-core results produced by the Ryzen 7 5800 will have shoppers clamoring for a thin and light laptop featuring the processor, but the multi-core results were clearly hampered by some unknown issue.

The Cinebench single-core results for the Ryzen 7 5800U show a slight performance increase over the Ryzen 7 4800U: R20 +5.56%; R23 +6.15% (against median scores). The 8-core Ryzen 5000 processor clocks at 2.0 GHz to 4.4 GHz and has an L3 cache of 16 MB compared to the Renoir part with 1.8 GHz to 4.2 GHz and 8 MB Level 3 cache. However, the multi-core results for the AMD Ryzen 7 5800U are a mixed bag when compared to the Ryzen 7 4800U (R20: +10.88%; R23: -4.47%), with VideoCardz opining that the tested laptop is artificially restricting the Zen 3 chip or there is an SMT issue with this sample.

The multithread result for the Ryzen 7 5800U in CPU-Z reinforces the possibility that the chip is being limited and will likely produce better results in later benchmarks, as it only scores 3,812 points here, which is a poor result for a 16-thread Ryzen processor. But the single-thread score of 592 points puts the 25 W part ahead of the 125 W Intel Core i9-10900K that has 584 points in CPU-Z’s performance chart. With benchmark results like that, a thin and light laptop sporting the Ryzen 7 5800U could offer the kind of performance that was previously limited to desktop PCs. It also puts a big dent in Team Blue’s perceived single-thread/single-core superiority.

Buy the Acer Swift thin and light laptop with Ryzen 7 4700U on Amazon

Cinebench R20
CPU (Single Core)
Median Intel Core i9-10900K (493 - 532, n=3)
524 Points ∼102%
AMD Ryzen 5800U leak
509 Points ∼99%
Median AMD Ryzen 7 4800U (474 - 481, n=3)
479 Points ∼93%
CPU (Multi Core)
Median Intel Core i9-10900K (5825 - 6381, n=3)
6181 Points ∼101%
AMD Ryzen 5800U leak
3614 Points ∼59%
Median AMD Ryzen 7 4800U (2943 - 3306, n=3)
3213 Points ∼52%
Cinebench R23
CPU (Single Core)
AMD Ryzen 5800U leak
1311 Points ∼100%
Median AMD Ryzen 7 4800U (1231 - 1235, n=2)
1233 Points ∼94%
CPU (Multi Core)
AMD Ryzen 5800U leak
9326 Points ∼100%
Median AMD Ryzen 7 4800U (7558 - 9762, n=2)
8660 Points ∼93%
CPU-Z. (Image source: Uniko's Hardware)
CPU-Z. (Image source: Uniko's Hardware)
CPU-Z. (Image source: Uniko's Hardware)
CPU-Z. (Image source: Uniko's Hardware)
CB R20. (Image source: Uniko's Hardware)
CB R20. (Image source: Uniko's Hardware)
CB R23. (Image source: Uniko's Hardware)
CB R23. (Image source: Uniko's Hardware)
CPU-Z chart single-thread. (Image source: valid.x86)
CPU-Z chart single-thread. (Image source: valid.x86)
CPU-Z chart 16-thread. (Image source: valid.x86)
CPU-Z chart 16-thread. (Image source: valid.x86)

Source(s)

Uniko's Hardware (in Chinese) via VideoCardz

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Daniel R Deakin
Daniel R Deakin - Managing Editor News - 2415 articles published on Notebookcheck since 2012
My interest in technology began after I was presented with an Atari 800XL home computer in the mid-1980s. I especially enjoy writing about technological advances, compelling rumors, and intriguing tech-related leaks. I have a degree in International Relations and Strategic Studies and count my family, reading, writing, and travel as the main passions of my life. I have been with Notebookcheck since 2012.
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2021 01 > Ryzen 7 5800U thin and light laptops should offer stellar single-core performance as AMD's Zen 3 APU scores higher than an Intel Core i9-10900K in CPU-Z
Daniel R Deakin, 2021-01- 8 (Update: 2021-01- 8)