AMD Athlon II X4 645 vs AMD Ryzen 9 7940HX

Last updated: 2024-06-04

CPU comparison with benchmarks


AMD Athlon II X4 645		AMD Ryzen 9 7940HX
CPU comparison AMD Athlon II X4 645 or AMD Ryzen 9 7940HX - 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 Athlon II X4 645 has 4 cores with 4 threads and clocks with a maximum frequency of 3.10 GHz. Up to 16 GB of memory is supported in 2 memory channels. The AMD Athlon II X4 645 was released in Q3/2010. The AMD Ryzen 9 7940HX has 16 cores with 32 threads and clocks with a maximum frequency of 5.20 GHz. The CPU supports up to 64 GB of memory in 2 memory channels. The AMD Ryzen 9 7940HX was released in Q1/2023.

AMD Athlon II (52)	Family	AMD Ryzen 9 (40)
AMD Athlon II X4 (Propus) (10)	CPU group	AMD Ryzen 7045 (6)
1	Generation	6
Propus	Architecture	Dragon Range (Zen 4)
Desktop / Server	Segment	Mobile
--	Predecessor	--
--	Successor	--

CPU Cores and Base Frequency The AMD Athlon II X4 645 is a 4 core processor with a clock frequency of 3.10 GHz. The AMD Ryzen 9 7940HX has 16 CPU cores with a clock frequency of 2.40 GHz (5.20 GHz).
AMD Athlon II X4 645	Characteristic	AMD Ryzen 9 7940HX
4	Cores	16
4	Threads	32
normal	Core architecture	normal
No	Hyperthreading	Yes
No	Overclocking ?	Yes
3.10 GHz	Frequency	2.40 GHz
--	Turbo Frequency (1 Core)	5.20 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 Athlon II X4 645	Characteristic	AMD Ryzen 9 7940HX
--	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	AMD Radeon 610M
	GPU frequency	0.40 GHz
--	GPU (Turbo)	2.20 GHz
--	GPU Generation	9
	Technology	6 nm
	Max. displays	3
--	Compute units	2
--	Shader	128
No	Hardware Raytracing	Yes
No	Frame Generation	No
--	Max. GPU Memory	8 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	AMD Radeon 610M
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	Decode
No	Codec AVC	Decode / Encode
No	Codec VC-1	Decode
No	Codec JPEG	Decode / Encode

Memory & PCIe The AMD Athlon II X4 645 supports a maximum of 16 GB of memory in 2 memory channels. The AMD Ryzen 9 7940HX can connect up to 64 GB of memory in 2 memory channels.
AMD Athlon II X4 645	Characteristic	AMD Ryzen 9 7940HX
DDR3-1333	Memory	DDR5-5200
16 GB	Max. Memory	64 GB
2 (Dual Channel)	Memory channels	2 (Dual Channel)
21.3 GB/s	Max. Bandwidth	83.2 GB/s
No	ECC	No
2.00 MB	L2 Cache	16.00 MB
--	L3 Cache	64.00 MB
2.0	PCIe version	5.0
--	PCIe lanes	28
--	PCIe Bandwidth	110.3 GB/s
Thermal Management The TDP (Thermal Design Power) of a processor specifies the required cooling solution. The AMD Athlon II X4 645 has a TDP of 95 W, that of the AMD Ryzen 9 7940HX is 55 W.
AMD Athlon II X4 645	Characteristic	AMD Ryzen 9 7940HX
95 W	TDP (PL1 / PBP)	55 W
--	TDP (PL2)	--
--	TDP up	75 W
--	TDP down	--
--	Tjunction max.	100 °C
Technical details The AMD Athlon II X4 645 has a 2.00 MB cache, while the AMD Ryzen 9 7940HX cache has a total of 80.00 MB.

AMD Athlon II X4 645	Characteristic	AMD Ryzen 9 7940HX
45 nm	Technology	5 nm
Unknown	Chip design	Chiplet
x86-64 (64 bit)	Instruction set (ISA)	x86-64 (64 bit)
MMX, 3DNow!, SSE3, SSE4a	ISA extensions	SSE4a, SSE4.1, SSE4.2,FMA3, AVX2, AVX512
AM3	Socket	FL1
AMD-V	Virtualization	AMD-V, SVM
No	AES-NI	Yes
Windows 10, Linux	Operating systems	Windows 10, Windows 11, Linux
Q3/2010	Release date	Q1/2023
--	Release price	--

show more data		show more data

AMD Athlon II X4 645 4C 4T @ 3.10 GHz buy now on Amazon and save! AMD Ryzen 9 7940HX 16C 32T @ 2.40 GHz (5.20 GHz) buy now on Amazon and save!

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Average performance in benchmarks

⌀ Single core performance in 1 CPU benchmarks

AMD Athlon II X4 645 (22%)

AMD Ryzen 9 7940HX (100%)

⌀ Multi core performance in 1 CPU benchmarks

AMD Athlon II X4 645 (5%)

AMD Ryzen 9 7940HX (100%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	402 (22%)
	AMD Ryzen 9 7940HX 16C 32T @ 5.20 GHz	1864 (100%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	1520 (5%)
	AMD Ryzen 9 7940HX 16C 32T @ 2.40 GHz	33370 (100%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	399 (100%)
	AMD Ryzen 9 7940HX 16C 32T @ 5.20 GHz	0 (0%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	1374 (100%)
	AMD Ryzen 9 7940HX 16C 32T @ 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 Athlon II X4 645 4C 4T @ 3.10 GHz	0 (0%)
	AMD Ryzen 9 7940HX 16C 32T @ 5.20 GHz	2691 (100%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	0 (0%)
	AMD Ryzen 9 7940HX 16C 32T @ 2.40 GHz	15792 (100%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	157 (100%)
	AMD Ryzen 9 7940HX 16C 32T @ 5.20 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 Athlon II X4 645 4C 4T @ 3.10 GHz	601 (100%)
	AMD Ryzen 9 7940HX 16C 32T @ 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 Athlon II X4 645 @ 0.00 GHz	0 (0%)
	AMD Ryzen 9 7940HX AMD Radeon 610M @ 2.20 GHz	443 (100%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	2274 (100%)
	AMD Ryzen 9 7940HX 16C 32T @ 2.40 GHz	0 (0%)

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 Athlon II X4 645 4C 4T @ 3.10 GHz	575 (100%)
	AMD Ryzen 9 7940HX 16C 32T @ 2.40 GHz	0 (0%)

Devices using this processor
AMD Athlon II X4 645	AMD Ryzen 9 7940HX
Unknown	Unknown

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