AMD Ryzen Threadripper PRO 9955WX vs Intel Xeon 6520P Comparison

The Verdict

The data splits this pair into two very different machines. The AMD Ryzen Threadripper PRO 9955WX wins 13 of 17 head-to-head benchmarks, and it does so with a 16-core, 32-thread design. The Intel Xeon 6520P counters with 24 cores and 48 threads, yet it only takes 4 wins, all in narrowly specific workloads. If your priority is single-thread speed, integer math, or extended instruction throughput, the AMD part is the clear choice. If you need raw physics simulation performance or prime-number finding, the Intel Xeon pulls ahead, but those wins are narrow in the broader context.

The benchmark averages tell the same story. The AMD chip records an average benchmark score of 101041, placing it in the 97th percentile of all CPUs. The Intel Xeon averages 93786, sitting in the 96th percentile. That difference is modest, but the delta matters: the AMD part sits 1.2% behind the AMD EPYC 7513 and 2.6% ahead of the AMD Ryzen Threadripper PRO 5965WX. The Intel chip is effectively tied with the Intel Core Ultra 7 270K Plus at a 0% delta, while trailing the AMD EPYC 4564P by 1.5%, the AMD EPYC 9175F by 1.9%, and the AMD EPYC 4565P by 2.1%.

For a desktop workstation, the AMD Ryzen Threadripper PRO 9955WX is the one to build around. It has an unlocked multiplier, a 5.40 GHz boost clock, and a 35% lead in single-thread Passmark scores. For a server or workstation deployment where multi-threaded physics and certain encryption tasks matter more, the Intel Xeon 6520P remains a viable alternative, but its wins are too scattered to recommend as the default.

FAQ

Q: Which CPU is faster in Cinebench R23 multi-core?

A: The AMD Ryzen Threadripper PRO 9955WX scores 59494, which is 11.2% ahead of the Intel Xeon 6520P's 53495.

Q: Does the Intel Xeon 6520P win any benchmark by a large margin?

A: Yes, the Intel Xeon 6520P wins Passmark physics by 42.3% (7209 vs 4156) and Passmark find prime numbers by 35.9% (526 vs 337), but these are the only two wins above 10%.

Q: Which CPU has the higher boost clock?

A: The AMD Ryzen Threadripper PRO 9955WX boosts to 5.40 GHz, while the Intel Xeon 6520P boosts to 4.00 GHz.

Q: How do the core counts compare?

A: The Intel Xeon 6520P has 24 cores and 48 threads, versus 16 cores and 32 threads on the AMD Ryzen Threadripper PRO 9955WX.

Q: Is the AMD chip unlocked for overclocking?

A: Yes, the AMD Ryzen Threadripper PRO 9955WX has an unlocked multiplier. The Intel Xeon 6520P does not.

Q: What is the memory bandwidth for both?

A: Both support DDR5 with an eight-channel memory bus, and both are rated at 409.6 GB/s.

Architecture Differences

The two processors are built on fundamentally different designs. The AMD Ryzen Threadripper PRO 9955WX uses the Zen 5 architecture, codenamed Shimada Peak, and is manufactured on a 4 nm process at TSMC. It uses a dual-chiplet layout with a combined die size of 2x 70.6 mm², totaling 16,630 million transistors. The Intel Xeon 6520P uses the Granite Rapids architecture, built on Intel's 5 nm process, with a single 598 mm² die.

Cache structures differ sharply. The AMD part allocates 64 KB of L1 and 1 MB of L2 per core, with 64 MB of shared L3. The Intel part has 112 KB of L1 and 2 MB of L2 per core, but a much larger 144 MB of shared L3. That extra L3 capacity on the Intel side helps in cache-heavy workloads, though the benchmark data shows it does not translate into broad performance leadership.

PCIe lane counts also separate the two. The AMD chip provides Gen 5 with 128 lanes (CPU only), while the Intel Xeon provides Gen 5 with 88 lanes (CPU only). For multi-GPU or high-density storage builds, the AMD part has a substantial connectivity advantage. Both support ECC memory and lack integrated graphics. The AMD part is classified as a desktop processor, while the Intel part is categorized as server/workstation.

Specification Differences

The most obvious difference is core count: the Intel Xeon 6520P has 24 cores and 48 threads, versus 16 cores and 32 threads on the AMD Ryzen Threadripper PRO 9955WX. However, clocks favor AMD heavily. The AMD chip runs at a 4.50 GHz base clock and 5.40 GHz boost, while the Intel chip runs at 2.40 GHz base and 4.00 GHz boost.

Power draw also differs. The AMD part has a 350 W TDP, while the Intel part is rated at 210 W. Sockets are incompatible: AMD uses Socket sTR5, Intel uses Socket 4710. The AMD part is newer, with a release date of 2025-07-22, versus 2025-02-23 for the Intel part. The AMD chip has an unlocked multiplier; the Intel chip does not. The AMD part has a launch MSRP of $1649. The Intel part has a launch MSRP of $1295.

Process node and foundry differ as well: AMD is on TSMC's 4 nm node, Intel on Intel's 5 nm node. Die size is dramatically different, with the Intel part at 598 mm² compared to the AMD's 2x 70.6 mm². Transistor count is only listed for AMD at 16,630 million. The AMD part is part of the 9000 series and Ryzen Threadripper generation, while the Intel part is from the Xeon 6 (Granite Rapids-SP) generation.

Head-to-Head Benchmarks

The Cinebench suite shows a consistent 11.2% advantage for the AMD Ryzen Threadripper PRO 9955WX across all six tests. In R15 multi-core, AMD scores 5996 to Intel's 5392. In R15 single-core, AMD scores 846 to Intel's 761. R20 multi-core: 24987 vs 22467. R20 single-core: 3527 vs 3171. R23 multi-core: 59494 vs 53495. R23 single-core: 8399 vs 7552. The consistency across both multi- and single-threaded tests indicates the AMD architecture simply executes Cinebench workloads more efficiently.

Passmark results are more varied. The AMD chip wins data compression by 9.4% (920954 vs 841518), extended instructions by 18.3% (76363 vs 64557), integer math by 10.2% (236120 vs 214288), multithread by 6.5% (67035 vs 62936), random string sorting by 4.3% (99813 vs 95736), and single-thread by 35% (4530 vs 3356). The Intel chip wins data encryption by 1.8% (45188 vs 44389), find prime numbers by 35.9% (526 vs 337), floating point math by 4.1% (162862 vs 156215), and physics by 42.3% (7209 vs 4156).

The single-thread Passmark result is the largest win for AMD at 35%, which aligns with the 5.40 GHz boost clock. The physics and prime number wins for Intel are equally large, but they come from workloads that heavily favor the extra cores and larger L3 cache on the Intel side.

Where Each One Wins

The AMD Ryzen Threadripper PRO 9955WX is the pick for general workstation use. It wins every Cinebench test, all by 11.2%, which makes it the better choice for 3D rendering, video encoding, and any software that relies on Cinebench-style multi-threaded performance. Its 35% lead in Passmark single-thread also makes it preferable for lightly threaded applications, such as legacy code, scripting, or interactive design tools that cannot scale across cores.

The AMD chip also wins integer math by 10.2% and extended instructions by 18.3%, covering encryption-adjacent workloads and AVX-heavy tasks. Data compression at 9.4% and random string sorting at 4.3% round out a broad productivity advantage. For a desktop workstation with multiple GPUs or many NVMe drives, the 128 PCIe Gen 5 lanes are a decisive factor.

The Intel Xeon 6520P has its own niche. Its 42.3% win in Passmark physics suggests it is better suited for simulation workloads that use rigid-body or particle physics, where the 24-core count and 144 MB L3 cache come into play. The 35.9% win in find prime numbers indicates a strength in certain mathematical or cryptographic workloads that rely on large integer operations and high thread counts. The smaller wins in floating point math (4.1%) and data encryption (1.8%) are less decisive, but they do show that the Intel part is not without merit in compute-heavy server tasks.

For a pure server deployment where power draw matters, the Intel Xeon 6520P's 210 W TDP versus the AMD's 350 W TDP is a meaningful operational difference. The Intel part also has a lower launch MSRP of $1295 compared to $1649 for the AMD chip. However, the AMD part's benchmark wins outnumber the Intel part's 13 to 4, and its single-thread and integer advantages are more broadly applicable. The verdict is straightforward: pick the AMD Ryzen Threadripper PRO 9955WX for a workstation that needs to do many things well, and pick the Intel Xeon 6520P only if your workload is dominated by physics, prime-number finding, or similar cache-hungry multi-threaded tasks.