AMD Ryzen Threadripper PRO 3975WX vs AMD Phenom II X2 521

Last updated: 2024-04-12

CPU comparison with benchmarks


AMD Ryzen Threadripper PRO 3975WX		AMD Phenom II X2 521
CPU comparison AMD Ryzen Threadripper PRO 3975WX or AMD Phenom II X2 521 - 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 Threadripper PRO 3975WX has 32 cores with 64 threads and clocks with a maximum frequency of 4.20 GHz. Up to 2048 GB of memory is supported in 8 memory channels. The AMD Ryzen Threadripper PRO 3975WX was released in Q3/2020. The AMD Phenom II X2 521 has 2 cores with 2 threads and clocks with a maximum frequency of 3.50 GHz. The CPU supports up to GB of memory in 2 memory channels. The AMD Phenom II X2 521 was released in Q2/2011.

AMD Ryzen Threadripper PRO (15)	Family	AMD Phenom II (52)
AMD Ryzen Threadripper PRO 3000 (4)	CPU group	AMD Phenom II - 500 (2)
3	Generation	1
Castle Peak (Zen 2)	Architecture	Regor (K10)
Desktop / Server	Segment	Desktop / Server
--	Predecessor	--
AMD Ryzen Threadripper PRO 5975WX	Successor	--

CPU Cores and Base Frequency The AMD Ryzen Threadripper PRO 3975WX is a 32 core processor with a clock frequency of 3.50 GHz (4.20 GHz). The AMD Phenom II X2 521 has 2 CPU cores with a clock frequency of 3.50 GHz.
AMD Ryzen Threadripper PRO 3975WX	Characteristic	AMD Phenom II X2 521
32	Cores	2
64	Threads	2
normal	Core architecture	normal
Yes	Hyperthreading	No
Yes	Overclocking ?	Yes
3.50 GHz	Frequency	3.50 GHz
4.20 GHz	Turbo Frequency (1 Core)	--
3.75 GHz	Turbo Frequency (All Cores)	--

Artificial Intelligence and Machine Learning Processors with the support of artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors. Algorithms for ML improve their performance the more data they have collected via software. ML tasks can be processed up to 10,000 times faster than with a classic processor.
AMD Ryzen Threadripper PRO 3975WX	Characteristic	AMD Phenom II X2 521
--	AI hardware	--
--	AI specifications	--

Internal Graphics 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	no iGPU
	GPU frequency	--
--	GPU (Turbo)	--
--	GPU Generation	--
	Technology
	Max. displays
--	Compute units	--
--	Shader	--
No	Hardware Raytracing	No
No	Frame Generation	No
--	Max. GPU Memory	--
--	DirectX Version	--

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	no iGPU
No	Codec h265 / HEVC (8 bit)	No
No	Codec h265 / HEVC (10 bit)	No
No	Codec h264	No
No	Codec VP9	No
No	Codec VP8	No
No	Codec AV1	No
No	Codec AVC	No
No	Codec VC-1	No
No	Codec JPEG	No

Memory & PCIe The AMD Ryzen Threadripper PRO 3975WX supports a maximum of 2048 GB of memory in 8 memory channels. The AMD Phenom II X2 521 can connect up to GB of memory in 2 memory channels.
AMD Ryzen Threadripper PRO 3975WX	Characteristic	AMD Phenom II X2 521
DDR4-3200	Memory	DDR3-1333, DDR2-1066
2048 GB	Max. Memory
8 (Octa Channel)	Memory channels	2 (Dual Channel)
51.2 GB/s	Max. Bandwidth	21.3 GB/s
Yes	ECC	No
16.00 MB	L2 Cache	--
128.00 MB	L3 Cache	2.00 MB
4.0	PCIe version	--
128	PCIe lanes	--
252.0 GB/s	PCIe Bandwidth	--
Thermal Management The TDP (Thermal Design Power) of a processor specifies the required cooling solution. The AMD Ryzen Threadripper PRO 3975WX has a TDP of 280 W, that of the AMD Phenom II X2 521 is 65 W.
AMD Ryzen Threadripper PRO 3975WX	Characteristic	AMD Phenom II X2 521
280 W	TDP (PL1 / PBP)	65 W
--	TDP (PL2)	--
--	TDP up	--
--	TDP down	--
95 °C	Tjunction max.	--
Technical details The AMD Ryzen Threadripper PRO 3975WX has a 144.00 MB cache, while the AMD Phenom II X2 521 cache has a total of 2.00 MB.
AMD Ryzen Threadripper PRO 3975WX	Characteristic	AMD Phenom II X2 521
7 nm	Technology	45 nm
Chiplet	Chip design	Unknown
x86-64 (64 bit)	Instruction set (ISA)	x86-64 (64 bit)
SSE4a, SSE4.1, SSE4.2, AVX2, FMA3	ISA extensions	SSE3, SSE4a
WRX8 (sWRX8)	Socket	AM3
AMD-V, SVM	Virtualization	AMD-V
Yes	AES-NI	No
Windows 10, Windows 11, Linux	Operating systems	Windows 10, Linux
Q3/2020	Release date	Q2/2011
2749 $	Release price	35 $

show more data		show more data

AMD Ryzen Threadripper PRO 3975WX 32C 64T @ 3.50 GHz (4.20 GHz) buy now on Amazon and save! AMD Phenom II X2 521 2C 2T @ 3.50 GHz buy now on Amazon and save!

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Average performance in benchmarks

⌀ Single core performance in 1 CPU benchmarks

AMD Ryzen Threadripper PRO 3975WX (100%)

AMD Phenom II X2 521 (44%)

⌀ Multi core performance in 2 CPU benchmarks

AMD Ryzen Threadripper PRO 3975WX (100%)

AMD Phenom II X2 521 (3%)

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 Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	62990 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 GHz	2253 (4%)

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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	209 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 GHz	92 (44%)

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 Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	7575 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 GHz	177 (2%)

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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	75 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	2504 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	1276 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	42986 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 GHz	0 (0%)

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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	1260 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Ryzen Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	25211 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	1627 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	15273 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 4.20 GHz	509 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	16740 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 GHz	0 (0%)

Blender 3.1 Benchmark

In the Blender Benchmark 3.1, the scenes "monster", "junkshop" and "classroom" are rendered and the time required by the system is measured. In our benchmark we test the CPU and not the graphics card. Blender 3.1 was presented as a standalone version in March 2022.


	AMD Ryzen Threadripper PRO 3975WX 32C 64T @ 3.75 GHz	680 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 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 Ryzen Threadripper PRO 3975WX 32C 64T @ 3.50 GHz	20747 (100%)
	AMD Phenom II X2 521 2C 2T @ 3.50 GHz	0 (0%)

Devices using this processor
AMD Ryzen Threadripper PRO 3975WX	AMD Phenom II X2 521
Unknown	Unknown

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