AMD Phenom II X2 521

Benchmarks for the AMD Phenom II X2 521 can be found below. Release dates, price and performance comparisons are also listed when available. This is made using thousands of PerformanceTest benchmark results and is updated daily.

The first graph shows the relative performance of the CPU compared to the 10 other common (single) CPUs in terms of PassMark CPU Mark.
The 2nd graph shows the value for money, in terms of the CPUMark per dollar.
The pricing history data shows the price for a single Processor. For multiple Processors, multiply the price shown by the number of CPUs.

Is the AMD Phenom II X2 521 Good for Gaming?

This is a fairly old CPU that is no longer competitive with newer CPUs. [More ...]

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AMD Phenom II X2 521

Description:

Class: Desktop

Socket: AM2+/AM3

Clockspeed: 3.5 GHz

Cores: 2 Threads: 2

Typical TDP: 65 W

Cache per CPU Package:
L1 Instruction Cache: 2 x 64 KB
L1 Data Cache: 2 x 64 KB
L2 Cache: 2 x 1024 KB

Other names: AMD Phenom(tm) II X2 521 Processor

CPU First Seen on Charts: Q2 2011

CPUmark/$Price: NA

Overall Rank:
4102nd fastest in multithreading out of 5791 CPUs
2909th fastest in single threading out of 5791 CPUs
1180th fastest in out of 1554 Desktop CPUs

Last Price Change: NA

Average CPU Mark rating

Multithread Rating

1349

Single Thread Rating

1402

^%
Samples: 41*
*Margin for error: Low

PerformanceTest V9
CPU Mark: 2,055
Thread: 1,141

^%Single thread rating may be higher than the overall rating, thread performance is just one component of the CPU Mark.

CPU Test Suite Average Results for AMD Phenom II X2 521

Integer Math	3,982 MOps/Sec
Floating Point Math	2,971 MOps/Sec
Find Prime Numbers	6 Million Primes/Sec
Random String Sorting	3,848 Thousand Strings/Sec
Data Encryption	387.1 MBytes/Sec
Data Compression	30,477 KBytes/Sec
Physics	108 Frames/Sec
Extended Instructions	668 Million Matrices/Sec
Single Thread	1,402 MOps/Sec

From submitted results to PerformanceTest V10 as of 18th of February 2026.

CPU Mark Distribution for AMD Phenom II X2 521

Submitted Baseline Distribution Graph as of 13th of February 2026

Not Enough Data from Current Version of PerformanceTest to Create Distribution Graph.

From submitted results since PerformanceTest V10 as of 13th of February 2026.

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CPU Mark Relative to Top 10 Common Desktop CPUs
As of 18th of February 2026 - Higher results represent better performance
Processor	Average CPU Mark
Intel Core i9-14900K		58,444
Intel Core i9-13900K		58,279
AMD Ryzen 9 5900X		38,939
Apple M4 10 Core		23,699
AMD Ryzen 5 5600X		21,844
Intel Core i5-12400F		19,584
Intel Core i9-9900K @ 3.60GHz		18,083
AMD Ryzen 5 3600		17,678
Apple M2 8 Core 3500 MHz		15,643
Apple M1 8 Core 3200 MHz		14,133
AMD Phenom II X2 521		1,349

CPU Value (CPU Mark / $Price )
As of 18th of February 2026 - Higher results represent better value
Processor	CPU Mark / $Price
AMD Ryzen 5 5600X		136.53
AMD Ryzen 9 5900X		130.23
Intel Core i9-14900K		124.62
Intel Core i5-12400F		122.41
AMD Ryzen 5 3600		117.87
Intel Core i9-13900K		107.93
Intel Core i9-9900K @ 3.60GHz		60.60
AMD Phenom II X2 521		NA
Apple M1 8 Core 3200 MHz		NA
Apple M2 8 Core 3500 MHz		NA
Apple M4 10 Core		NA

Single Thread Rating
As of 18th of February 2026 - Higher results represent better performance
Processor	Average Thread Rating
Intel Core i9-14900K		4,694
Intel Core i9-13900K		4,600
Apple M4 10 Core		4,516
Apple M2 8 Core 3500 MHz		3,886
Apple M1 8 Core 3200 MHz		3,676
Intel Core i5-12400F		3,489
AMD Ryzen 9 5900X		3,467
AMD Ryzen 5 5600X		3,365
Intel Core i9-9900K @ 3.60GHz		2,914
AMD Ryzen 5 3600		2,560
AMD Phenom II X2 521		1,402

Last 4 Baselines for AMD Phenom II X2 521
Most recent listed first
Baseline	CPU Mark
BL2984529 - Oct 17 2025		1249
BL1961703 - Dec 03 2023		1472
BL1679036 - Nov 25 2022		1466
BL1379739 - Mar 08 2021		1367

Additional baselines can be obtained using Windows version of PerformanceTest's Manage Baselines feature.

Popular comparisons for AMD Phenom II X2 521
As of 18th of February 2026 - Higher results represent better performance
Processor	Average CPU Mark
AMD Phenom II X2 521		1,349
Intel Pentium G620 @ 2.60GHz vs AMD Phenom II X2 521		1,240 (-8.1%)
Intel Pentium G850 @ 2.90GHz vs AMD Phenom II X2 521		1,494 (+10.8%)
Intel Pentium G860 @ 3.00GHz vs AMD Phenom II X2 521		1,494 (+10.8%)
Intel Pentium G840 @ 2.80GHz vs AMD Phenom II X2 521		1,375 (+2.0%)
Intel Pentium G630 @ 2.70GHz vs AMD Phenom II X2 521		1,356 (+0.5%)
AMD Athlon II X2 270 vs AMD Phenom II X2 521		1,337 (-0.9%)
Intel Celeron G540 @ 2.50GHz vs AMD Phenom II X2 521		1,182 (-12.3%)
Intel Celeron G530 @ 2.40GHz vs AMD Phenom II X2 521		1,150 (-14.7%)
Intel Pentium E5700 @ 3.00GHz vs AMD Phenom II X2 521		1,095 (-18.8%)
AMD A4-3400 APU vs AMD Phenom II X2 521		1,075 (-20.3%)
AMD Phenom II X2 565 vs AMD Phenom II X2 521		1,453 (+7.7%)
Intel Pentium G6960 @ 2.93GHz vs AMD Phenom II X2 521		1,433 (+6.3%)

Is the AMD Phenom II X2 521 Good for Gaming?
As of 18th of February 2026 - Higher results represent better performance
Processor	Relative Gaming Score
AMD Ryzen 9 9950X3D2		14,501
AMD Ryzen 9 9900X3D		12,432
AMD Ryzen 7 9800X3D		12,123
AMD Ryzen 9 9950X3D		11,257
AMD Ryzen 9 7900X3D		10,794
Intel Core Ultra 7 270K Plus		10,695
AMD Ryzen 5 7600X3D		10,517
Intel Core Ultra 9 285K		10,377
AMD Ryzen 7 7800X3D		10,257
AMD Ryzen 5 7500X3D		10,195
AMD Ryzen 9 9955HX3D		9,783
AMD Ryzen 9 7950X3D		9,780
AMD Phenom II X2 521		288

CPU Benchmarks

CPU Benchmarks

AMD Phenom II X2 521

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CPU Test Suite Average Results for AMD Phenom II X2 521

CPU Mark Distribution for AMD Phenom II X2 521