AMD Ryzen 7 5800U ‘Zen 3’ CPU Based Laptop Tested, 15W Chip Delivers Single-Core Performance On Par With Intel’s Top Desktop CPUs

Hassan Mujtaba

We have been talking about the high-performance Cezanne CPUs based on the Zen 3 architecture for a while now but it's time to take a look at the Ryzen 5000 U-series chips. So for that purpose, we are taking a look at the latest benchmarks of an AMD Ryzen 7 5800U based laptop which has been posted by Uniko's hardware.

AMD Ryzen 7 5800U 'Cezanne-H' CPU With 8 Zen 3 Cores Tested, 15W Chip Faster Than Most Intel 10th Gen Core i7 Desktop CPUs

The AMD Ryzen 7 5800U is part of the Cezanne-U lineup which is aimed at mainstream and low-power notebook designs. As such, it will feature lower clock speeds but retain mostly the same configuration as the Cezanne-H part. Coming straight to the specifications, the Ryzen 7 5800U is going to feature 8 cores and 16 threads along with 16 MB of L3 cache and 4 MB of L2 cache. The clocks for the chip are set at 2.00 GHz base and 4.40 GHz boost.

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AMD Ryzen 5000 APU Lineup (Preliminary Specs):

APU NameAPU FamilyArchitectureProcessCores / ThreadsBase ClockBoost ClockL3 CacheGraphicsGPU ClockTDP
Ryzen 9 5900HXCezanne HZen 37nm8 / 163.30 GHz4.70 GHz16 MB8 CUs (512 SP)TBD35-45W
Ryzen 9 5900HCezanne HZen 37nm8 / 163.30 GHz4.65 GHz16 MB8 CUs (512 SP)TBD35-45W
Ryzen 7 5800HCezanne HZen 37nm8 / 163.20 GHzTBD16 MB8 CUs (512 SP)~2000 MHz35-45W
Ryzen 9 5900HSCezanne HZen 37nm8 / 163.10 GHz4.50 GHz16 MBTBDTBD35-45W
Ryzen 5 5600HCezanne HZen 37nm6 / 123.10 GHz4.10 GHz8 MBTBDTBD35-45W
Ryzen 7 5800UCezanne UZen 37nm8 / 162.00 GHz4.40 GHz16 MB8 CUs (512 SP)2000 MHz10-25W
Ryzen 7 5700ULucienne UZen 27nm8 / 161.80 GHz4.30 GHz8 MB8 CUs (512 SP)1900 MHz10-25W
Ryzen 5 5600UCezanne UZen 37nm6 / 122.30 GHz4.30 GHz12 MB7 CUs (448 SP)1800 MHz10-25W
Ryzen 5 5500ULucienne UZen 27nm6 / 122.10 GHz4.00 GHz8 MB7 CUs (448 SP)1800 MHz10-25W
Ryzen 3 5400UCezanne UZen 37nm4 / 82.60 GHz4.00 GHz8 MB6 CUs (384 SP)1600 MHz10-25W
Ryzen 3 5300ULucienne UZen 27nm4 / 82.60 GHz3.85 GHz4 MB6 CU (384 SP)1500 MHz10-25W

Since this is a 15W design, it cannot be compared to the Cezanne-H 35W parts which offer much higher and stable clock speeds. Uniko's numbers come from its own sources and based around early laptop designs so while the numbers are definitely not final, they are worth taking a look at.


For performance, we have three benchmarks that were posted. These include CPU-z, Cinebench R20, and Cinebench R23. In CPU-z, the AMD Ryzen 7 5800U scores 592 points in single and 3812 points in multi-core tests. In Cinebench R23, the chip scores 509 points in single and 3614 points within the multi-core test. In Cinebench R20, the chip scores 1311 points in single and 9326 points in the multi-core test.


One thing that is immediately noticeable is that the single-core performance sees a major jump but the multi-threaded performance just isn't that great. This could be due to several reasons with the early laptop design being one of them. It is possible that the multi-threading for this specific chip is not operating properly. However, Uniko reports that the same source provided him some results of an AMD Ryzen 7 4800U running on a similar laptop configuration and that scored 479 points in the single-core and 2836 points in the multi-core test in Cinebench R20. This represents a lead of 6.2% in single and 27.4% in the multi-core tests. But for comparison's sake, we will just keep the Ryzen 7 5800U multi-thread numbers out for now. You can see below how the numbers stack up in CPU-z below:

AMD Ryzen 7 5800U Leaked CPU-z Benchmark Comparison (Single-Core)
Single-Core (1T)
AMD Ryzen 7 5800X
AMD Ryzen 9 5900H
AMD Ryzen 7 5800U
Intel Core i7-10700K
Intel Core i7-10875H
AMD Ryzen 7 3800X
AMD Ryzen 7 4800U
AMD Ryzen 7 4800H

As you can see, the single-core performance is right there with Intel's top dogs in the desktop CPU segment. That is a fantastic showcase of just how good AMD's single-core lead has gone up with its Zen 3 core architecture. And the most mind-boggling part is that this chip has a TDP of 15W which goes up to 25W at max while the Intel Desktop CPUs are rated at 125W but go all the way up to 250 Watts. Of course, the chip won't clock as well and won't be offering the same amount of multi-core performance but in the end, just getting close to these desktop parts is a feat on its own.

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