EPYC 7H12 vs Phenom X4 9550

Place in the ranking	2446	48
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Server
Series	no data	AMD EPYC
Power efficiency	1.04	14.82
Architecture codename	Agena (2007−2008)	Zen 2 (2017−2020)
Release date	March 2008 (16 years ago)	18 September 2019 (5 years ago)

Detailed specifications

Phenom X4 9550 and EPYC 7H12 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 cores	4 (Quad-Core)	64 (Tetrahexaconta-Core)
Threads	4	128
Base clock speed	no data	2.6 GHz
Boost clock speed	2.2 GHz	3.3 GHz
Multiplier	no data	26
L1 cache	128 KB (per core)	96K (per core)
L2 cache	512 KB (per core)	512K (per core)
L3 cache	2 MB (shared)	256 MB (shared)
Chip lithography	65 nm	7 nm, 14 nm
Die size	285 mm²	192 mm²
Number of transistors	450 million	4,800 million
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	-	+

Compatibility

Information on Phenom X4 9550 and EPYC 7H12 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 configuration	1	2 (Multiprocessor)
Socket	AM2+	TR4
Power consumption (TDP)	95 Watt	280 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Phenom X4 9550 and EPYC 7H12. You'll probably need this information if you require some particular technology.

AES-NI	-	+
AVX	-	+
Precision Boost 2	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Phenom X4 9550 and EPYC 7H12 are enumerated here.

AMD-V

Memory specs

Types, maximum amount and channel quantity of RAM supported by Phenom X4 9550 and EPYC 7H12. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	no data	DDR4 Eight-channel
Maximum memory size	no data	4 TiB
Max memory channels	no data	8
Maximum memory bandwidth	no data	204.763 GB/s
ECC memory support	-	+

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.

Phenom X4 9550 1.04

EPYC 7H12 43.84
+4115%

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.

Phenom X4 9550 1656

EPYC 7H12 69633
+4105%

Gaming performance

Pros & cons summary

Performance score	1.04	43.84
Physical cores	4	64
Threads	4	128
Chip lithography	65 nm	7 nm
Power consumption (TDP)	95 Watt	280 Watt

Phenom X4 9550 has 194.7% lower power consumption.

EPYC 7H12, on the other hand, has a 4115.4% higher aggregate performance score, 1500% more physical cores and 3100% more threads, and a 828.6% more advanced lithography process.

The EPYC 7H12 is our recommended choice as it beats the Phenom X4 9550 in performance tests.

Note that Phenom X4 9550 is a desktop processor while EPYC 7H12 is a server/workstation one.

Should you still have questions on choice between Phenom X4 9550 and EPYC 7H12, ask them in Comments section, and we shall answer.