i9-9900KF vs Xeon 6521P
Aggregate performance score
Xeon 6521P outperforms Core i9-9900KF by a whopping 259% based on our aggregate benchmark results.
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 95 | 847 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 6.62 |
| Market segment | Server | Desktop processor |
| Series | no data | Intel Core i9 |
| Power efficiency | 6.93 | 4.57 |
| Designer | Intel | Intel |
| Manufacturer | no data | Intel |
| Architecture codename | no data | Coffee Lake-R (2018−2019) |
| Release date | 1 January 2025 (less than a year ago) | 8 January 2019 (6 years ago) |
| Launch price (MSRP) | no data | $488 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
Xeon 6521P and Core i9-9900KF 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 | 24 (Tetracosa-Core) | 8 (Octa-Core) |
| Threads | 48 | 16 |
| Base clock speed | 2.6 GHz | 3.6 GHz |
| Boost clock speed | 4.1 GHz | 5 GHz |
| Bus type | no data | DMI 3.0 |
| Bus rate | no data | 4 × 8 GT/s |
| L1 cache | no data | 64K (per core) |
| L2 cache | no data | 256K (per core) |
| L3 cache | 144 MB | 16 MB (shared) |
| Chip lithography | Intel 3 nm | 14 nm |
| Maximum core temperature | 82 °C | 100 °C |
| Maximum case temperature (TCase) | no data | 72 °C |
| 64 bit support | - | + |
| Windows 11 compatibility | no data | + |
| Unlocked multiplier | - | + |
Compatibility
Information on Xeon 6521P and Core i9-9900KF 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 | no data | 1 (Uniprocessor) |
| Socket | FCLGA4710 | FCLGA1151 |
| Power consumption (TDP) | 225 Watt | 95 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon 6521P and Core i9-9900KF. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512, Intel® AMX | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | no data | + |
| Speed Shift | + | no data |
| Turbo Boost Technology | 2.0 | 2.0 |
| Hyper-Threading Technology | + | + |
| TSX | + | + |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Deep Learning Boost | + | - |
Security technologies
Xeon 6521P and Core i9-9900KF technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | - |
| EDB | + | + |
| MPX | - | + |
| Identity Protection | - | + |
| SGX | + | Yes with Intel® ME |
| OS Guard | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon 6521P and Core i9-9900KF are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon 6521P and Core i9-9900KF. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5(6400MT/s) | DDR4-2666 |
| Maximum memory size | 4 TB | 128 GB |
| Max memory channels | 8 | 2 |
| Maximum memory bandwidth | no data | 42.671 GB/s |
| ECC memory support | + | - |
Peripherals
Specifications and connection of peripherals supported by Xeon 6521P and Core i9-9900KF.
| PCIe version | 5.0 | 3.0 |
| PCI Express lanes | 136 | 16 |
Synthetic benchmarks
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.
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. Other than that, Passmark measures multi-core performance.
Pros & cons summary
| Performance score | 36.87 | 10.28 |
| Recency | 1 January 2025 | 8 January 2019 |
| Physical cores | 24 | 8 |
| Threads | 48 | 16 |
| Power consumption (TDP) | 225 Watt | 95 Watt |
Xeon 6521P has a 258.7% higher aggregate performance score, an age advantage of 5 years, and 200% more physical cores and 200% more threads.
i9-9900KF, on the other hand, has 136.8% lower power consumption.
The Intel Xeon 6521P is our recommended choice as it beats the Intel Core i9-9900KF in performance tests.
Be aware that Xeon 6521P is a server/workstation processor while Core i9-9900KF is a desktop one.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
