FX-8120

Details and Benchmarks for AMD FX-8120

Sysbuilds Alpha Stage!

Please take all results with a big grain of salt. Sysbuilds is in alpha stage at the moment which can lead to wrong data, strange counting errors, silly results and more. This site is under active development.

Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for FX-8120 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,953 Rank: 908
Rank Name Score Visual
904 Xeon D-2123IT 4,960
+0.1%
905 Core i7-4700HQ 4,958
+0.1%
906 Core i7-3920XM 4,955
+0%
907 Core i5-6267U 4,954
+0%
908 FX-8120 4,953
909 Xeon D-1587 4,952
+-0%
910 Core i7-2600K 4,951
+-0%
911 Core i7-4558U 4,951
+-0%
912 Core i7-4750HQ 4,948
-0.1%
913 Core i7-4700MQ 4,947
-0.1%

View full ranking →

Multicore Score

Multicore performance score for FX-8120 based on multi-threaded benchmark results.

4,600 Rank: 1090
Rank Name Score Visual
1086 Core i7-5557U 4,602
+0%
1087 Intel Pentium P6100 4,601
+0%
1088 Core i3-7300T 4,601
+0%
1089 Phenom II X6 1065T 4,601
+0%
1090 FX-8120 4,600
1091 Pentium Silver J5005 4,599
+-0%
1092 Core i7-6650U 4,599
+-0%
1093 Core i5-6442EQ 4,596
-0.1%
1094 Core i3-7167U 4,596
-0.1%
1095 Pentium G4600 4,595
-0.1%

View full ranking →

Singlecore Score

Single-core performance score for FX-8120 based on single-threaded benchmark results.

5,189 Rank: 813
Rank Name Score Visual
809 Core i5-9400T 5,198
+0.2%
810 Xeon E5-2679 v4 5,197
+0.2%
811 Core i7-6820EQ 5,190
+0%
812 Xeon Gold 5120T 5,190
+0%
813 FX-8120 5,189
814 AMD Ryzen 5 1400 5,188
+-0%
815 Xeon D-1622 5,186
-0.1%
816 Xeon E3-1270 v3 5,186
-0.1%
817 Xeon Platinum 8270 5,185
-0.1%
818 Core i5-7400T 5,184
-0.1%

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Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for FX-8120 based on integer math, floating point math, and prime number computation benchmarks.

-- Rank: --

Number Crunching score not yet available.

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Data Processing

Aggregated score for FX-8120 based on data encryption, data compression, and string sorting benchmarks.

-- Rank: --

Data Processing score not yet available.

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Physics & Compute

Aggregated score for FX-8120 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

-- Rank: --

Physics & Compute score not yet available.

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FX-8120 Details

Built on AMD's Zambezi microarchitecture at a 32 nm process node, the FX-8120 is a desktop processor that was released in October 2011. As of March 2026, this CPU is well over a decade old and represents an earlier generation of high-end desktop processors from AMD. Despite its age, the FX-8120 remains notable for its 8-core design, which was ambitious for its time, and its 3.1 GHz base clock speed, which provided strong multi-threaded performance in its era. The processor operates at a 65 W TDP and is designed for the FCLGA1155 socket, making it compatible with a range of motherboards from that generation.

It supports DDR3 1066/1333 memory in a dual-channel configuration, with a maximum memory bandwidth of 21 GB/s and up to 32 GB of system memory. The chip features 7.629 MiB of L3 cache and integrates an HD Graphics 3000 GPU with a burst frequency of 1100 MHz, capable of driving up to two displays. While not a primary graphics solution, the integrated GPU is functional for basic display output, particularly on motherboards that support this feature. The FX-8120 includes support for a wide range of instruction sets, including MMX, SSE, AVX, AVX2, AES, and AMD-V, enabling it to handle modern applications and virtualization tasks.

It also supports simultaneous multithreading, although this is not a defining feature of the architecture. In terms of benchmark performance, the FX-8120 achieves an overall score of 4953, ranking #908 out of 2060 processors, with a single-core score of 5189 (#813) and a multicore score of 4600 (#1090). These results place it behind many modern CPUs, particularly in single-threaded workloads, where it competes with mid-tier Intel processors like the Core i7-6820EQ and Xeon Gold 5120T. However, its multicore performance remains competitive with older mid-range chips such as the Phenom II X6 1065T and Core i3-7300T.

The processor's performance in the top 50 lists is modest, with no entry in the top 50 overall, single-core, or multicore rankings, highlighting its position as a legacy component in today's computing landscape. The FX-8120 is best suited for legacy systems, retro builds, or users who require a cost-effective multi-core solution for light workloads. While it lacks the efficiency and modern features of current processors, its unlocked multiplier and robust core count make it a viable option for enthusiasts focused on overclocking and basic computing tasks. As of 2026, it is no longer competitive in mainstream markets but retains value in niche applications where legacy compatibility and affordability are priorities.
Frequently Compared

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AMD FX-8120

Main Specifications

Designer: AMD
Name: FX-8120
Model Number: i3-2105
Cores: 2
Threads: 4
Base Frequency: 3100 MHz
Clock Multiplier: 15.5xx (unlocked)
Core Name: Zambezi
Socket: FCLGA1155
Package: µPGA
Target Segment: Desktop
Max CPUs: 1
TDP: 65 W

Cache Specifications

L3 Cache: 7.629 MiB

Memory Specifications

Supported Memory Type: DDR3 1066/1333
Memory Channels: 2
Maximum Memory: 0 GB
Maximum Bandwidth: 21 GB/s
ECC Support: No

PCI-Express Specifications

PCIe Revision: 2.0
PCIe Lanes: 16
PCIe Configuration: 1x16, 2x8

Integrated Graphics

GPU: HD Graphics 3000
GPU Designer: Intel
GPU Max Frequency: 1100 MHz

Physical Specifications

Process: 32 nm
Die Area: 315 mm²
Word Size: 64-bit

CPU Features

MMX SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 AES CLMUL x86-64 HT EIST TXT vPro VT-x VT-d EPT Secure Key SMEP SIPP IPT SSE4a FMA4 AMD-V TSX Flex Memory FMA XOP
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