AMD Ryzen 9 3900XT vs Intel Pentium Gold 6405U

Last updated: 2024-04-16

CPU comparison with benchmarks


AMD Ryzen 9 3900XT		Intel Pentium Gold 6405U
CPU comparison AMD Ryzen 9 3900XT or Intel Pentium Gold 6405U - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results. The AMD Ryzen 9 3900XT has 12 cores with 24 threads and clocks with a maximum frequency of 4.70 GHz. Up to 128 GB of memory is supported in 2 memory channels. The AMD Ryzen 9 3900XT was released in Q2/2020. The Intel Pentium Gold 6405U has 2 cores with 4 threads and clocks with a maximum frequency of 2.40 GHz. The CPU supports up to 64 GB of memory in 2 memory channels. The Intel Pentium Gold 6405U was released in Q4/2019.

AMD Ryzen 9 (40)	Family	Intel Pentium (150)
AMD Ryzen 3000 (15)	CPU group	Intel Pentium 6000 (1)
3	Generation	10
Matisse (Zen 2)	Architecture	Comet Lake U
Desktop / Server	Segment	Mobile
--	Predecessor	--
AMD Ryzen 9 5900XT	Successor	--

CPU Cores and Base Frequency The AMD Ryzen 9 3900XT is a 12 core processor with a clock frequency of 4.10 GHz (4.70 GHz). The Intel Pentium Gold 6405U has 2 CPU cores with a clock frequency of 2.40 GHz.
AMD Ryzen 9 3900XT	Characteristic	Intel Pentium Gold 6405U
12	Cores	2
24	Threads	4
normal	Core architecture	normal
Yes	Hyperthreading	Yes
Yes	Overclocking ?	No
4.10 GHz	Frequency	2.40 GHz
4.70 GHz	Turbo Frequency (1 Core)	--
4.60 GHz	Turbo Frequency (All Cores)	--


NPU AI performance The performance values of the processor's AI unit. The isolated NPU performance is specified here, the total AI performance (NPU+CPU+iGPU) can be higher. Processors with support for artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors.
AMD Ryzen 9 3900XT	Characteristic	Intel Pentium Gold 6405U
--	AI hardware	--
--	AI specifications	--
--	NPU + CPU + iGPU	--

Integrated graphics (iGPU) The integrated graphics unit of a processor is not only responsible for the pure image output on the system, but can also significantly increase the efficiency of the system with the support of modern video codecs.
no iGPU	GPU	Intel UHD Graphics 610
	GPU frequency	0.30 GHz
--	GPU (Turbo)	0.95 GHz
--	GPU Generation	9.5
	Technology	14 nm
	Max. displays	3
--	Compute units	12
--	Shader	96
No	Hardware Raytracing	No
No	Frame Generation	No
--	Max. GPU Memory	32 GB
--	DirectX Version	12

Hardware codec support A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.
no iGPU	GPU	Intel UHD Graphics 610
No	Codec h265 / HEVC (8 bit)	Decode / Encode
No	Codec h265 / HEVC (10 bit)	Decode / Encode
No	Codec h264	Decode / Encode
No	Codec VP9	Decode / Encode
No	Codec VP8	Decode / Encode
No	Codec AV1	No
No	Codec AVC	Decode / Encode
No	Codec VC-1	Decode
No	Codec JPEG	Decode / Encode

Memory & PCIe The AMD Ryzen 9 3900XT supports a maximum of 128 GB of memory in 2 memory channels. The Intel Pentium Gold 6405U can connect up to 64 GB of memory in 2 memory channels.
AMD Ryzen 9 3900XT	Characteristic	Intel Pentium Gold 6405U
DDR4-3200	Memory	LPDDR3-2133, DDR4-2400
128 GB	Max. Memory	64 GB
2 (Dual Channel)	Memory channels	2 (Dual Channel)
51.2 GB/s	Max. Bandwidth	38.4 GB/s
Yes	ECC	No
--	L2 Cache	--
64.00 MB	L3 Cache	2.00 MB
4.0	PCIe version	2.0
20	PCIe lanes	12
39.4 GB/s	PCIe Bandwidth	6.0 GB/s
Thermal Management The TDP (Thermal Design Power) of a processor specifies the required cooling solution. The AMD Ryzen 9 3900XT has a TDP of 105 W, that of the Intel Pentium Gold 6405U is 15 W.
AMD Ryzen 9 3900XT	Characteristic	Intel Pentium Gold 6405U
105 W	TDP (PL1 / PBP)	15 W
142 W	TDP (PL2)	--
--	TDP up	--
--	TDP down	12.5 W
95 °C	Tjunction max.	100 °C
Technical details The AMD Ryzen 9 3900XT has a 64.00 MB cache, while the Intel Pentium Gold 6405U cache has a total of 2.00 MB.

AMD Ryzen 9 3900XT	Characteristic	Intel Pentium Gold 6405U
7 nm	Technology	14 nm
Chiplet	Chip design	Monolithic
x86-64 (64 bit)	Instruction set (ISA)	x86-64 (64 bit)
SSE4a, SSE4.1, SSE4.2, AVX2, FMA3	ISA extensions	SSE4.1, SSE4.2
AM4 (PGA 1331)	Socket	BGA 1528
AMD-V, SVM	Virtualization	VT-x, VT-x EPT, VT-d
Yes	AES-NI	Yes
Windows 10, Windows 11, Linux	Operating systems	Windows 10, Windows 11, Linux
Q2/2020	Release date	Q4/2019
--	Release price	193 $

show more data		show more data

AMD Ryzen 9 3900XT 12C 24T @ 4.10 GHz (4.70 GHz) buy now on Amazon and save! Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz buy now on Amazon and save!

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Average performance in benchmarks

⌀ Single core performance in 1 CPU benchmarks

AMD Ryzen 9 3900XT (100%)

Intel Pentium Gold 6405U (42%)

⌀ Multi core performance in 2 CPU benchmarks

AMD Ryzen 9 3900XT (100%)

Intel Pentium Gold 6405U (9%)

Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	1414 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	592 (42%)

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	AMD Ryzen 9 3900XT 12C 24T @ 4.60 GHz	12974 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	1340 (10%)

Estimated results for PassMark CPU Mark

Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.


	AMD Ryzen 9 3900XT 12C 24T @ 4.60 GHz	32790 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	2329 (7%)

Cinebench 2024 (Single-Core)

The Cinebench 2024 benchmark is based on the Redshift rendering engine, which is also used in Maxon's 3D program Cinema 4D. The benchmark runs are each 10 minutes long to test whether the processor is limited by its heat generation.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	78 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench 2024 (Multi-Core)

The Multi-Core test of the Cinebench 2024 benchmark uses all cpu cores to render using the Redshift rendering engine, which is also used in Maxons Cinema 4D. The benchmark run is 10 minutes long to test whether the processor is limited by its heat generation.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	1074 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench R23 (Single-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	1354 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench R23 (Multi-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	AMD Ryzen 9 3900XT 12C 24T @ 4.60 GHz	18511 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Geekbench 6 (Single-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The single-core benchmark only evaluates the performance of the fastest CPU core, the number of CPU cores in a processor is irrelevant here.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	1719 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Geekbench 6 (Multi-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The multi-core benchmark evaluates the performance of all of the processor's CPU cores. Virtual thread improvements such as AMD SMT or Intel's Hyper-Threading have a positive impact on the benchmark result.


	AMD Ryzen 9 3900XT 12C 24T @ 4.60 GHz	10689 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench R20 (Single-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	539 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench R20 (Multi-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	AMD Ryzen 9 3900XT 12C 24T @ 4.60 GHz	7244 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

iGPU - FP32 Performance (Single-precision GFLOPS)

The theoretical computing performance of the internal graphics unit of the processor with simple accuracy (32 bit) in GFLOPS. GFLOPS indicates how many billion floating point operations the iGPU can perform per second.


	AMD Ryzen 9 3900XT @ 0.00 GHz	0 (0%)
	Intel Pentium Gold 6405U Intel UHD Graphics 610 @ 0.95 GHz	182 (100%)

CPU-Z Benchmark 17 (Multi-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.


	AMD Ryzen 9 3900XT 12C 24T @ 4.10 GHz	8118 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench R15 (Single-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	AMD Ryzen 9 3900XT 12C 24T @ 4.70 GHz	219 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	AMD Ryzen 9 3900XT 12C 24T @ 4.60 GHz	3192 (100%)
	Intel Pentium Gold 6405U 2C 4T @ 2.40 GHz	0 (0%)

Devices using this processor
AMD Ryzen 9 3900XT	Intel Pentium Gold 6405U
Unknown	Lenovo Ideapad 3 17IML05

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