i9-13900KS vs FX-8120
Aggregate performance score
Core i9-13900KS outperforms FX-8120 by a whopping 833% based on our aggregate benchmark results.
Primary details
Comparing FX-8120 and Core i9-13900KS processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1396 | 73 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 55.86 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 3.14 | 24.42 |
| Architecture codename | Zambezi (2011−2012) | Raptor Lake-S (2023−2024) |
| Release date | 12 October 2011 (13 years ago) | 12 January 2023 (1 year ago) |
| Launch price (MSRP) | no data | $699 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
FX-8120 and Core i9-13900KS 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 | 8 (Octa-Core) | 24 (Tetracosa-Core) |
| Performance-cores | no data | 8 |
| Efficient-cores | no data | 16 |
| Threads | 8 | 32 |
| Base clock speed | 3.1 GHz | 3.2 GHz |
| Boost clock speed | 4 GHz | 5.8 GHz |
| L1 cache | 384 KB | 80K (per core) |
| L2 cache | 8192 KB | 2 MB (per core) |
| L3 cache | 8192 KB | 36 MB (shared) |
| Chip lithography | 32 nm | Intel 7 nm |
| Die size | 315 mm2 | 257 mm2 |
| Maximum core temperature | 61 °C | 100 °C |
| Maximum case temperature (TCase) | no data | 72 °C |
| Number of transistors | 1,200 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| Unlocked multiplier | + | + |
| P0 Vcore voltage | Min: 1.0125 V - Max: 1.4125 V | no data |
Compatibility
Information on FX-8120 and Core i9-13900KS 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 | 1 |
| Socket | AM3+ | FCLGA1700 |
| Power consumption (TDP) | 125 Watt | 150 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by FX-8120 and Core i9-13900KS. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| FMA | + | - |
| AVX | + | + |
| Enhanced SpeedStep (EIST) | no data | + |
| Speed Shift | no data | + |
| Turbo Boost Technology | no data | 2.0 |
| Hyper-Threading Technology | no data | + |
| TSX | - | + |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Turbo Boost Max 3.0 | no data | + |
| Deep Learning Boost | - | + |
Security technologies
FX-8120 and Core i9-13900KS technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
| EDB | no data | + |
| Secure Key | no data | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by FX-8120 and Core i9-13900KS are enumerated here.
| AMD-V | + | - |
| VT-d | no data | + |
| VT-x | no data | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by FX-8120 and Core i9-13900KS. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR5-5600, DDR4-3200 |
| Maximum memory size | no data | 192 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 89.6 GB/s |
| ECC memory support | - | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel UHD Graphics 770 |
| Quick Sync Video | - | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 1.65 GHz |
| Execution Units | no data | 32 |
Graphics interfaces
Available interfaces and connections of FX-8120 and Core i9-13900KS integrated GPUs.
| Number of displays supported | no data | 4 |
Graphics image quality
Maximum display resolutions supported by FX-8120 and Core i9-13900KS integrated GPUs, including resolutions over different interfaces.
| Max resolution over HDMI 1.4 | no data | 4096 x 2160 @ 60Hz |
| Max resolution over eDP | no data | 5120 x 3200 @ 120Hz |
| Max resolution over DisplayPort | no data | 7680 x 4320 @ 60Hz |
Graphics API support
APIs supported by FX-8120 and Core i9-13900KS integrated GPUs, sometimes API versions are included.
| DirectX | no data | 12 |
| OpenGL | no data | 4.5 |
Peripherals
Specifications and connection of peripherals supported by FX-8120 and Core i9-13900KS.
| PCIe version | n/a | 5.0 and 4.0 |
| PCI Express lanes | no data | 20 |
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.
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.
GeekBench 5 Single-Core
GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.
GeekBench 5 Multi-Core
GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.
Pros & cons summary
| Performance score | 4.15 | 38.70 |
| Recency | 12 October 2011 | 12 January 2023 |
| Physical cores | 8 | 24 |
| Threads | 8 | 32 |
| Power consumption (TDP) | 125 Watt | 150 Watt |
FX-8120 has 20% lower power consumption.
i9-13900KS, on the other hand, has a 832.5% higher aggregate performance score, an age advantage of 11 years, and 200% more physical cores and 300% more threads.
The Core i9-13900KS is our recommended choice as it beats the FX-8120 in performance tests.
Should you still have questions on choice between FX-8120 and Core i9-13900KS, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
