Ryzen 7 7840U vs Ryzen 9 7900

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Aggregate performance score

Ryzen 9 7900
2023
12 cores / 24 threads, 65 Watt
31.61
+95.5%

Ryzen 9 7900 outperforms Ryzen 7 7840U by an impressive 95% based on our aggregate benchmark results.

Primary details

Comparing Ryzen 9 7900 and Ryzen 7 7840U processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking116382
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation65.09no data
Market segmentDesktop processorLaptop
Seriesno dataAMD Phoenix (Zen 4, Ryzen 7040)
Architecture codenameRaphael (Zen4)Phoenix-U (Zen 4)
Release date14 January 2023 (1 year ago)May 2023 (1 year ago)
Current price$498 no data

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

Ryzen 9 7900 and Ryzen 7 7840U basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores12 (Dodeca-Core)8 (Octa-Core)
Threads2416
Base clock speed3.7 GHz3.3 GHz
Boost clock speed5.4 GHz5.1 GHz
L1 cache64K (per core)64K (per core)
L2 cache1 MB (per core)1 MB (per core)
L3 cache64 MB (shared)16 MB (shared)
Chip lithography5 nm4 nm
Die size2x 71 mm2178 mm2
Maximum core temperature95 °C100 °C
Maximum case temperature (TCase)47 °Cno data
Number of transistors13,140 million25,000 million
64 bit support++
Windows 11 compatibility++
Unlocked multiplierYesNo

Compatibility

Information on Ryzen 9 7900 and Ryzen 7 7840U compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration11
SocketAM5FP8
Power consumption (TDP)65 Watt28 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 7900 and Ryzen 7 7840U. You'll probably need this information if you require some particular technology.

Instruction set extensions5 nm, 0.650 - 1.475Vno data
AES-NI++
AVX++

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 7900 and Ryzen 7 7840U are enumerated here.

AMD-V++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 7900 and Ryzen 7 7840U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR5-5200DDR5-5600

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card
Compare
AMD Radeon Graphics (Ryzen 7000)AMD Radeon 780M

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 7900 and Ryzen 7 7840U.

PCIe version5.04.0
PCI Express lanes2420

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Ryzen 9 7900 31.61
+95.5%
Ryzen 7 7840U 16.17

Ryzen 9 7900 outperforms Ryzen 7 7840U by 95% based on our aggregate benchmark results.


Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Benchmark coverage: 68%

Ryzen 9 7900 48892
+95.5%
Ryzen 7 7840U 25007

Ryzen 9 7900 outperforms Ryzen 7 7840U by 96% in Passmark.

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

Benchmark coverage: 42%

Ryzen 9 7900 2836
+35.8%
Ryzen 7 7840U 2089

Ryzen 9 7900 outperforms Ryzen 7 7840U by 36% in GeekBench 5 Single-Core.

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

Benchmark coverage: 42%

Ryzen 9 7900 16847
+93.4%
Ryzen 7 7840U 8713

Ryzen 9 7900 outperforms Ryzen 7 7840U by 93% in GeekBench 5 Multi-Core.

Cinebench 10 32-bit single-core

Cinebench R10 is an ancient ray tracing benchmark for processors by Maxon, authors of Cinema 4D. Its single core version uses just one CPU thread to render a futuristic looking motorcycle.

Benchmark coverage: 20%

Ryzen 9 7900 8339
+25%
Ryzen 7 7840U 6669

Ryzen 9 7900 outperforms Ryzen 7 7840U by 25% in Cinebench 10 32-bit single-core.

Cinebench 10 32-bit multi-core

Cinebench Release 10 Multi Core is a variant of Cinebench R10 using all the processor threads. Possible number of threads is limited by 16 in this version.

Benchmark coverage: 19%

Ryzen 9 7900 60934
+58.3%
Ryzen 7 7840U 38490

Ryzen 9 7900 outperforms Ryzen 7 7840U by 58% in Cinebench 10 32-bit multi-core.

3DMark06 CPU

3DMark06 is a discontinued DirectX 9 benchmark suite from Futuremark. Its CPU part contains two scenarios, one dedicated to artificial intelligence pathfinding, another to game physics using PhysX package.

Benchmark coverage: 19%

Ryzen 9 7900 19451
+55.8%
Ryzen 7 7840U 12482

Ryzen 9 7900 outperforms Ryzen 7 7840U by 56% in 3DMark06 CPU.

wPrime 32

wPrime 32M is a math multi-thread processor test, which calculates square roots of first 32 million integer numbers. Its result is measured in seconds, so that the less is benchmark result, the faster the processor.

Benchmark coverage: 18%

Ryzen 9 7900 2.98
+17.8%
Ryzen 7 7840U 3.51

Ryzen 7 7840U outperforms Ryzen 9 7900 by 18% in wPrime 32.

Cinebench 11.5 64-bit multi-core

Cinebench Release 11.5 Multi Core is a variant of Cinebench R11.5 which uses all the processor threads. A maximum of 64 threads is supported in this version.

Benchmark coverage: 17%

Ryzen 9 7900 45
+100%
Ryzen 7 7840U 23

Ryzen 9 7900 outperforms Ryzen 7 7840U by 100% in Cinebench 11.5 64-bit multi-core.

Cinebench 15 64-bit multi-core

Cinebench Release 15 Multi Core is a variant of Cinebench R15 which uses all the processor threads.

Benchmark coverage: 15%

Ryzen 9 7900 4020
+102%
Ryzen 7 7840U 1990

Ryzen 9 7900 outperforms Ryzen 7 7840U by 102% in Cinebench 15 64-bit multi-core.

Cinebench 15 64-bit single-core

Cinebench R15 (standing for Release 15) is a benchmark made by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version (sometimes called Single-Thread) only uses a single processor thread to render a room full of reflective spheres and light sources.

Benchmark coverage: 15%

Ryzen 9 7900 315
+19.3%
Ryzen 7 7840U 264

Ryzen 9 7900 outperforms Ryzen 7 7840U by 19% in Cinebench 15 64-bit single-core.

Cinebench 11.5 64-bit single-core

Cinebench R11.5 is an old benchmark by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version loads a single thread with ray tracing to render a glossy room full of crystal spheres and light sources.

Benchmark coverage: 14%

Ryzen 9 7900 3.68
+31.9%
Ryzen 7 7840U 2.79

Ryzen 9 7900 outperforms Ryzen 7 7840U by 32% in Cinebench 11.5 64-bit single-core.

TrueCrypt AES

TrueCrypt is a discontinued piece of software that was widely used for on-the-fly-encryption of disk partitions, now superseded by VeraCrypt. It contains several embedded performance tests, one of them being TrueCrypt AES, which measures data encryption speed using AES algorithm. Result is encryption speed in gigabytes per second.

Benchmark coverage: 13%

Ryzen 9 7900 21.5
+154%
Ryzen 7 7840U 8.5

Ryzen 9 7900 outperforms Ryzen 7 7840U by 154% in TrueCrypt AES.

WinRAR 4.0

WinRAR 4.0 is an outdated version of a popular file archiver. It contains an internal speed test, using 'Best' setting of RAR compression on large chunks of randomly generated data. Its results are measured in kilobytes per second.

Benchmark coverage: 13%

Ryzen 9 7900 10154
+77.4%
Ryzen 7 7840U 5723

Ryzen 9 7900 outperforms Ryzen 7 7840U by 77% in WinRAR 4.0.

x264 encoding pass 2

x264 Pass 2 is a slower variant of x264 video compression that produces a variable bit rate output file, which results in better quality since the higher bit rate is used when it is needed more. Benchmark result is still measured in frames per second.  

Benchmark coverage: 13%

Ryzen 9 7900 207
+90.2%
Ryzen 7 7840U 109

Ryzen 9 7900 outperforms Ryzen 7 7840U by 90% in x264 encoding pass 2.

x264 encoding pass 1

x264 version 4.0 is a video encoding benchmark uses MPEG 4 x264 compression method to compress a sample HD (720p) video. Pass 1 is a faster variant that produces a constant bit rate output file. Its result is measured in frames per second, which means how many frames of the source video file were encoded per second.  

Benchmark coverage: 13%

Ryzen 9 7900 356
+49.8%
Ryzen 7 7840U 237

Ryzen 9 7900 outperforms Ryzen 7 7840U by 50% in x264 encoding pass 1.

Gaming performance

Pros & cons summary


Performance score 31.61 16.17
Integrated graphics card 4.34 18.35
Physical cores 12 8
Threads 24 16
Chip lithography 5 nm 4 nm
Power consumption (TDP) 65 Watt 28 Watt

The Ryzen 9 7900 is our recommended choice as it beats the Ryzen 7 7840U in performance tests.

Note that Ryzen 9 7900 is a desktop processor while Ryzen 7 7840U is a notebook one.


Should you still have questions on choice between Ryzen 9 7900 and Ryzen 7 7840U, ask them in Comments section, and we shall answer.

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AMD Ryzen 9 7900
Ryzen 9 7900
AMD Ryzen 7 7840U
Ryzen 7 7840U

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