AMD · Ryzen 9 · 2019 · AM4
The AMD Ryzen 9 3900X is a desktop processor with 12 cores, released in 2019 at an MSRP of $499. It is part of the Ryzen 9 lineup, using the Ryzen 3000 platform, and fits the AM4 socket. Internally, it is built on the "Zen 2" architecture. Thanks to AMD Simultaneous Multi-Threading (SMT), each core can handle two instruction streams simultaneously, yielding a total of 24 threads for improved parallelism. The Ryzen 9 3900X has a base clock of 3.8 GHz and can boost up to 4.6 GHz depending on workload and thermal headroom. AMD manufactures the "Zen 2" silicon on a 7nm process node. The multiplier is unlocked, making overclocking straightforward. This processor supports DDR4 memory. ECC memory is supported, provided the motherboard enables it. With a TDP of 105W, the Ryzen 9 3900X sits in a typical power envelope for a modern desktop CPU. This processor has no integrated graphics — a discrete GPU is required. The cache hierarchy consists of 64KB/core of L1, 6MB of L2, and 64MB of L3 cache — an unusually large L3 that greatly benefits latency-sensitive workloads like gaming.
| Brand | AMD |
|---|---|
| Family | Ryzen 9 |
| Series | Ryzen 3000 |
| Architecture | Zen 2 |
| Type | Desktop |
| Launch year | 2019 |
| Cores | 12 |
| Threads | 24 |
| Base clock | 3.8 GHz |
| Boost clock | 4.6 GHz |
| L1 cache | 64KB/core |
| L2 cache | 6MB |
| L3 cache | 64MB |
| TDP | 105W |
| Socket | AM4 |
| Process | 7nm |
| Memory type | DDR4 |
| Integrated graphics | None |
| Chipsets | X570, B550, X470, B450, A520, X370, B350, A320, X300, B300 |
| Launch MSRP | $499 |
| Part number | 100-100000023BOX |
| OEM / tray part number | 100-000000023 |