AMD Ryzen 9 3900X vs AMD Ryzen 7 7840U

Compare AMD Ryzen 9 Desktop 12 core CPU vs AMD Ryzen 7 8 core processor, specs and benchmark score. Which is the better CPU for gaming?

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Specifications
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Benchmark Score

Overall Score

A combined score of all workloads

8422 points

2% slightly better overall score

8215 points

Gaming Score

The raw gaming performance with a fast GPU

8440 points

10758 points

27% slightly better gaming score

Multitasking Score

Performance in workloads using up to 8 cores

8406 points

13% slightly better multitasking score

7390 points

Heavy Workload Score

Performance in workloads using up to 16 cores

8392 points

16% slightly better heavy workload score

7189 points

Free CPU Benchmark

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Other Benchmarks

3DMark Physics score

Physics simulation benchmark

8594 points

57% significantly higher 3DMark Physics score

5466 points

Blender score

Cycles Render (Samples per minute)

276.80 points

41% slightly higher Blender score

195.47 points

Cinebench R23 score

Multi threaded benchmark

19000 points

27% slightly higher Cinebench R23 score

14873 points

Geekbench 6 (multi) score

Multi threaded benchmark

9907 points

10324 points

4% slightly higher Geekbench 6 (multi) score

Geekbench 6 (single) score

Single threaded benchmark

1704 points

2258 points

32% slightly higher Geekbench 6 (single) score

Specifications

Cores

Number of physical processing units

49% significantly more cores

Threads

Number of logical processing units

49% significantly more threads

Clock Speed

Base frequency at which the chip operates

3.80 GHz

15% slightly higher clock speed

3.30 GHz

Turbo Speed

Higher frequency used for heavy workloads

4.6 GHz

5.1 GHz

10% slightly higher turbo speed

TDP

Thermal Design Power: Measure of heat generated by the CPU

105 W

28 W

274% significantly lower TDP

Memory Channels

Lanes for simultaneous memory access

Identical

L2 Cache

Secondary embedded memory, slower than L1 cache

6 MiB

8 MiB

33% slightly more L2 cache

L3 Cache

General memory pool for all cores

64 MiB

300% significantly more L3 cache

16 MiB

Other details

Rank

Ranking in the hardwareDB database

130th of 1,089

139th of 1,089

Family

The product line

Ryzen 9 Desktop

Ryzen 7

Release date

The official date of release of this chip

2019 July

2023 May

Memory Type

The type of memory used by this chip

DDR4

DDR5 (FP7r2)

Is Unlocked

Can this CPU can be overclocked

Yes

Ryzen 9 3900X vs Ryzen 7 7840U benchmarks

In our benchmarks, the Ryzen 9 3900X beats the Ryzen 7 7840U in overall performance. Despite this, the Ryzen 7 7840U has the advantage in our gaming benchmark.

When comparing core counts for these CPUs, we notice that the Ryzen 9 3900X has significantly more cores with 12 cores compared to the Ryzen 7 7840U that has 8 cores. It also has more threads than the Ryzen 7 7840U. With our hardware info, we find that the Ryzen 9 3900X has a slightly higher clock speed than the Ryzen 7 7840U. The cache sizes of these CPUs are different. Indeed, the Ryzen 7 7840U has slightly more L2 cache than the Ryzen 9 3900X. Despite this, the Ryzen 9 3900X has significantly more L3 cache compared to the Ryzen 7 7840U.

Most CPUs have more threads than cores. This technology, colloquially called hyperthreading, improves performance by splitting a core into multiple virtual ones. This provides more efficient utilisation of a core. Indeed, the Ryzen 9 3900X has more threads than cores. Each physical core is split into multiple threads.