AMD Ryzen 9 7900 vs Ryzen 9 7900X CPU Review

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By Brent Justice
9.5
OVERALL SCORE

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Test Setup

AMD Ryzen 9 7900 CPU System Setup Table

The Ryzen 9 7900 and Ryzen 7900X are tested on the AMD X670E AM5 platform shown above in the table. We used the latest BIOS at the time of testing which was 1202. This is based on AGESA 1.0.0.6. We are using the motherboard’s current default BIOS settings. We have Resizable BAR ENABLED.

The CPUs are cooled by an MSI MEG CORELIQUID S360 AIO cooler. We used 32GB of G.SKILL Trident Z5 Neo DDR5 F5-6000J3038F16GX2-TZ5N (32GB 6000MHz @ 30-38-38-96) memory with EXPO Profile 1 enabled.

An NVIDIA GeForce RTX 4090 Founders Edition video card with driver GeForce 531.41 was common on both CPUs.

We are using a fresh install of Windows 11 Pro with the latest Windows Updates, including the 22H2 Fall 2022 update. We also have the latest chipset drivers installed which is 5.02.19.2221. We are using the BALANCED power profile in Windows Settings. Hardware Accelerated GPU Scheduling is ENABLED in Windows.  Virtual Based Security (VBS) is DISABLED and Game Mode is ENABLED.

AMD Precision Boost Overdrive (PBO)

In our testing today we have also enabled PBO in the BIOS on the Ryzen 9 7900. For this we went into the BIOS and simply enabled PBO at the default settings, no further tweaking was done. We are therefore using the default PBO settings on this motherboard once you enable PBO. The graphs show “PBO ENABLED” which indicates the performance with PBO Enabled in the BIOS.

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REVIEW OVERVIEW

Performance
9
Efficiency (Perf per Watt)
10
Features
10
Value
9

SUMMARY

We reviewed the AMD Ryzen 9 7900 CPU and compared it directly versus the Ryzen 9 7900X to find out the performance differences in synthetic benchmarks and gaming performance. The Ryzen 9 7900 performed well but was quite under the 7900X in multi-core performance, but made up in single-thread or lightly threaded workloads where performance differences were small. The efficiency is excellent as a 65W CPU, and the features are top-notch. For the money, the CPU offers a lot of value and can be pushed higher with PBO, and a little tweaking. It offers a lot of possibility and options.
9.5
OVERALL SCORE
Brent Justicehttps://www.thefpsreview.com
Former managing editor of GPUs at HardOCP for 18 years, Brent Justice has been reviewing computer components since the late 90s, educated in the art and method of the computer hardware review, he brings experience, knowledge, and hands-on testing with a gamer-oriented and hardware enthusiast perspective. You can follow him on Twitter - @Brent_Justice You can sub to his YouTube channel - Justice Gaming https://www.youtube.com/c/JusticeGamingChannel You can check out his computer builds on KIT - @BrentJustice https://kit.co/BrentJustice

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We reviewed the AMD Ryzen 9 7900 CPU and compared it directly versus the Ryzen 9 7900X to find out the performance differences in synthetic benchmarks and gaming performance. The Ryzen 9 7900 performed well but was quite under the 7900X in multi-core performance, but made up in single-thread or lightly threaded workloads where performance differences were small. The efficiency is excellent as a 65W CPU, and the features are top-notch. For the money, the CPU offers a lot of value and can be pushed higher with PBO, and a little tweaking. It offers a lot of possibility and options.AMD Ryzen 9 7900 vs Ryzen 9 7900X CPU Review
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