Ryzen Threadripper PRO 9965WX vs Athlon II X4 651K
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 40 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 18.72 |
| Market segment | Desktop processor | Server |
| Power efficiency | no data | 6.49 |
| Designer | AMD | AMD |
| Manufacturer | no data | TSMC |
| Architecture codename | Llano (2011−2012) | Shimada Peak (2025) |
| Release date | 14 November 2011 (13 years ago) | 23 July 2025 (less than a year ago) |
| Launch price (MSRP) | no data | $2,899 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
Athlon II X4 651K and Ryzen Threadripper PRO 9965WX 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) | 24 (Tetracosa-Core) |
| Threads | 4 | 48 |
| Base clock speed | 3 GHz | 4.2 GHz |
| Boost clock speed | 3 GHz | 5.4 GHz |
| L1 cache | 128 KB (per core) | 64 KB (per core) |
| L2 cache | 1 MB (per core) | 1 MB (per core) |
| L3 cache | 0 KB | 128 MB (shared) |
| Chip lithography | 32 nm | 4 nm |
| Die size | 228 mm2 | 4x 70.6 mm2 |
| Number of transistors | 1,178 million | 33,260 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | - | + |
Compatibility
Information on Athlon II X4 651K and Ryzen Threadripper PRO 9965WX 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 | FM1 | sTR5 |
| Power consumption (TDP) | 100 Watt | 350 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon II X4 651K and Ryzen Threadripper PRO 9965WX. 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 Athlon II X4 651K and Ryzen Threadripper PRO 9965WX are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon II X4 651K and Ryzen Threadripper PRO 9965WX. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | N/A |
Peripherals
Specifications and connection of peripherals supported by Athlon II X4 651K and Ryzen Threadripper PRO 9965WX.
| PCIe version | no data | 5.0 |
| PCI Express lanes | no data | 136 |
Pros & cons summary
| Recency | 14 November 2011 | 23 July 2025 |
| Physical cores | 4 | 24 |
| Threads | 4 | 48 |
| Chip lithography | 32 nm | 4 nm |
| Power consumption (TDP) | 100 Watt | 350 Watt |
Athlon II X4 651K has 250% lower power consumption.
Ryzen Threadripper PRO 9965WX, on the other hand, has an age advantage of 13 years, 500% more physical cores and 1100% more threads, and a 700% more advanced lithography process.
We couldn't decide between AMD Athlon II X4 651K and AMD Ryzen Threadripper PRO 9965WX. We've got no test results to judge.
Note that Athlon II X4 651K is a desktop processor while Ryzen Threadripper PRO 9965WX is a server/workstation one.
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