AMD Ryzen 9 3900X vs AMD Phenom II X4 945

Ryzen 9 3900X vs Phenom II X4 945 benchmarks

In our benchmarks, the Ryzen 9 3900X beats the Phenom II X4 945 in overall performance. Furthermore, our gaming benchmark shows that it also outperforms the Phenom II X4 945 in all gaming tests too.

When comparing core counts for these CPUs, we notice that the Ryzen 9 3900X has significantly more cores with 12 cores compared to the Phenom II X4 945 that has 4 cores. It also has more threads than the Phenom II X4 945. These CPUs have different clock speeds. Indeed, the Ryzen 9 3900X has a slightly higher clock speed compared to the Phenom II X4 945. The cache sizes of these CPUs are different. Indeed, the Ryzen 9 3900X has significantly more L2 cache than the Phenom II X4 945. The Ryzen 9 3900X also has significantly more L3 cache.

Most CPUs have more threads than cores. This technology, colloquially called hyperthreading, improves performance by splitting a core into multiple virtual ones. This provides more efficient utilisation of a core. Indeed, the Ryzen 9 3900X has more threads than cores. Each physical core is split into multiple threads.