AMD Ryzen Threadripper 3960X vs AMD Ryzen Threadripper PRO 5945WX Comparison

The AMD Ryzen Threadripper PRO 5945WX and the AMD Ryzen Threadripper 3960X occupy two distinct corners of the high-end desktop and workstation market, despite their shared Threadripper branding. The data shows a clear split: the 3960X dominates in heavily threaded multi-core workloads, while the 5945WX counters with superior single-core performance and a crucial win in Geekbench multi-core. The 3960X wins six of the eight head-to-head benchmarks, but the 5945WX’s two victories are strategically significant. For users prioritizing raw multi-threaded compute, the 3960X is the clear choice. For those needing faster single-thread response and lower latency on lightly threaded tasks, the 5945WX offers a compelling alternative. The 3960X carries a launch MSRP of $1399. The 5945WX, with its active production status and server/workstation market segment, targets a different deployment profile.

The Verdict

Benchmark results indicate that the AMD Ryzen Threadripper 3960X is the performance leader in aggregate multi-core work. Its average benchmark score is 9284, which places it in the 65th percentile of all CPUs. The 5945WX averages 9348, also in the 65th percentile, but this slight edge is misleading. The head-to-head data reveals that the 3960X wins the Cinebench R15, R20, and R23 multi-core tests by margins of -26.5% (meaning the 5945WX trails by that amount). Specifically, the 3960X scores 4692 in Cinebench R15 multi-core versus 3447 for the 5945WX, and 46557 versus 34204 in Cinebench R23 multi-core. This is a massive advantage for the older 24-core part.

However, the 5945WX is not without its merits. In Geekbench multi-core, the 5945WX edges out the 3960X by a slim 0.3% delta, scoring 13371 versus 13326. More strikingly, in Geekbench single-core, the 5945WX leads by 22.5%, scoring 2059 versus 1681. The 3960X also wins all Cinebench single-core tests by -26.6%, but the Geekbench single-core result suggests the 5945WX’s architecture handles certain single-threaded loads more efficiently. The verdict is straightforward: choose the 3960X for maximum multi-threaded throughput in rendering or simulation. Choose the 5945WX if your workload is dominated by single-threaded performance and you need the stability of an active workstation platform.

Architecture Differences

The two processors are built on different Zen microarchitectures. The 5945WX uses Zen 3, with the codename Chagall PRO, while the 3960X uses Zen 2, codenamed Castle Peak. Both are manufactured on the same 7 nm process at TSMC, but the transistor counts differ: the 5945WX has 16,600 million transistors spread across a die size of 4x 81 mm², while the 3960X contains 15,200 million transistors on a 4x 74 mm² die. The core counts diverge significantly: the 5945WX has 12 cores and 24 threads, while the 3960X has double the cores at 24 and 48 threads. Both have a 64 KB L1 cache per core and 512 KB L2 per core, but the L3 cache is drastically different. The 5945WX offers 64 MB of L3, while the 3960X provides 128 MB, a doubling of the shared cache.

Memory support is a key architectural split. The 5945WX uses an eight-channel memory bus with a peak bandwidth of 204.8 GB/s, and it supports ECC memory. The 3960X uses a quad-channel bus with 102.4 GB/s bandwidth and does not support ECC. The 5945WX also features PCIe Gen 4 with 128 lanes (CPU only), whereas the 3960X has PCIe Gen 4 but without a specified lane count. The sockets differ as well: the 5945WX uses AMD Socket WRX8, while the 3960X uses AMD Socket TRX4. The 5945WX has a locked multiplier, while the 3960X has an unlocked multiplier for overclocking. The 5945WX is classified as a Server/Workstation part, while the 3960X is a Desktop part. The 5945WX was released later, in March 2022, compared to November 2019 for the 3960X.

FAQ

Q: Which processor has more cores?

A: The AMD Ryzen Threadripper 3960X has 24 cores and 48 threads, while the AMD Ryzen Threadripper PRO 5945WX has 12 cores and 24 threads.

Q: Is the 5945WX faster in single-core performance?

A: In Geekbench single-core, the 5945WX scores 2059 versus 1681 for the 3960X, a 22.5% advantage. However, in Cinebench R23 single-core, the 3960X scores 6572 versus 4828 for the 5945WX.

Q: Which CPU has a larger L3 cache?

A: The 3960X has 128 MB of L3 cache, which is double the 64 MB found on the 5945WX.

Q: Does the 5945WX support ECC memory?

A: Yes, the 5945WX supports ECC memory. The 3960X does not support ECC.

Q: What is the memory bandwidth of each processor?

A: The 5945WX has an eight-channel memory bus delivering 204.8 GB/s, while the 3960X has a quad-channel bus delivering 102.4 GB/s.

Q: Which processor is from a newer series?

A: The 5945WX belongs to the 5000 series, while the 3960X belongs to the 3000 series. The 5945WX is based on Zen 3, and the 3960X is based on Zen 2.

Specification Differences

The two CPUs differ in several key specification fields. The core count is 12 for the 5945WX versus 24 for the 3960X. Thread counts are 24 versus 48. The base clock is 4.10 GHz for the 5945WX and 3.80 GHz for the 3960X; both have a boost clock of 4.50 GHz. The process node is identical (7 nm, TSMC), but the transistor count is 16,600 million for the 5945WX and 15,200 million for the 3960X. The die size is 4x 81 mm² versus 4x 74 mm². L3 cache is 64 MB versus 128 MB. Memory bus width is eight-channel versus quad-channel, and memory bandwidth is 204.8 GB/s versus 102.4 GB/s. ECC support is present on the 5945WX but absent on the 3960X. PCIe is Gen 4 with 128 lanes (CPU only) on the 5945WX, versus Gen 4 with unspecified lanes on the 3960X. The socket is WRX8 versus TRX4. The 5945WX has a locked multiplier, while the 3960X is unlocked. The market segment is Server/Workstation versus Desktop. The part numbers are 100-000000448 for the 5945WX and 100-000000010100-100000010WOF for the 3960X.

Head-to-Head Benchmarks

The head-to-head results show a dominant performance by the 3960X in Cinebench tests. In Cinebench R15 multi-core, the 3960X scores 4692, which is 26.5% higher than the 5945WX’s 3447. The R20 multi-core test shows a similar margin: 19553 versus 14365, again a -26.5% delta for the 5945WX. Cinebench R23 multi-core continues the trend, with 46557 for the 3960X and 34204 for the 5945WX. In every Cinebench single-core test, the 3960X also wins. Cinebench R15 single-core is 662 versus 486, R20 single-core is 2760 versus 2027, and R23 single-core is 6572 versus 4828, all with a delta of -26.6% or -26.5% for the 5945WX.

The 5945WX takes the Geekbench tests. In Geekbench multi-core, the 5945WX scores 13371, a 0.3% improvement over the 3960X’s 13326. The Geekbench single-core result is more pronounced: 2059 versus 1681, a 22.5% lead for the 5945WX. This single result is the largest positive delta for either CPU in the head-to-head data. The 3960X’s wins are all clustered around the -26.5% mark, indicating a consistent multi-core and Cinebench advantage, while the 5945WX’s wins are in Geekbench, with a particularly large single-core lead.

Where Each One Wins

The AMD Ryzen Threadripper 3960X wins decisively in Cinebench workloads, which are typically render-heavy and multi-threaded. Its 24 cores and 48 threads, combined with 128 MB of L3 cache, allow it to outperform the 5945WX by roughly 26.5% across R15, R20, and R23 multi-core tests. This makes it the stronger choice for 3D rendering, video encoding, and any application that scales linearly with core count. The 3960X also wins all Cinebench single-core tests, although by a smaller margin in absolute terms. Its unlocked multiplier is an additional advantage for users who want to push clock speeds, given the same 280 W TDP as the 5945WX.

The AMD Ryzen Threadripper PRO 5945WX wins in Geekbench tests. The 0.3% margin in Geekbench multi-core is narrow, but the 22.5% lead in single-core is substantial. This suggests that the Zen 3 architecture in the 5945WX offers better instruction-level efficiency for certain workloads, despite having half the cores. The 5945WX also provides an eight-channel memory bus with 204.8 GB/s bandwidth, double the 3960X’s quad-channel 102.4 GB/s, which benefits memory-intensive tasks. Its ECC memory support and Server/Workstation market segment indicate a focus on stability and data integrity. The 5945WX’s active production status and newer release date point to ongoing platform support. For users prioritizing single-threaded application performance, memory bandwidth, and ECC reliability, the 5945WX is the appropriate pick, even with its lower core count.