AMD Ryzen 9 PRO 9945 vs Intel Xeon 6520P Comparison

The AMD Ryzen 9 PRO 9945 and the Intel Xeon 6520P represent two distinct philosophies for high-performance computing, one prioritizing efficiency and single-thread agility, the other raw multi-threaded throughput and platform bandwidth. The data in the FACT PACK shows a clear split: the Intel Xeon 6520P dominates in 9 of 11 head-to-head benchmark comparisons, while the AMD Ryzen 9 PRO 9945 wins decisively in single-threaded tests and offers a dramatically lower power envelope. The following analysis breaks down these differences using benchmark scores, architectural specifications, and platform capabilities.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD Ryzen 9 PRO 9945 has a slightly higher average benchmark score of 96,083 compared to the Intel Xeon 6520P’s 93,786. Both processors sit in the 96th percentile of all CPUs, indicating they are top-tier performers.

Q: How do their single-threaded performances compare?

A: The AMD Ryzen 9 PRO 9945 is significantly faster in single-threaded workloads, scoring 4,619 in the PassMark single-thread test versus the Intel Xeon 6520P’s 3,356. This represents a 37.6% advantage for the AMD processor.

Q: Which chip wins in multi-threaded performance?

A: The Intel Xeon 6520P leads in the PassMark multithread test with a score of 62,936, while the AMD Ryzen 9 PRO 9945 scores 48,664. The Intel processor is 22.7% ahead in this metric.

Q: What is the difference in memory bandwidth and channels?

A: The Intel Xeon 6520P supports eight-channel memory with a bandwidth of 409.6 GB/s, whereas the AMD Ryzen 9 PRO 9945 uses dual-channel memory with a bandwidth of 89.6 GB/s.

Q: Do both processors support ECC memory?

A: Yes, both the AMD Ryzen 9 PRO 9945 and the Intel Xeon 6520P support ECC memory, making them suitable for server and workstation environments where data integrity is critical.

Q: What is the manufacturing process for each chip?

A: The AMD Ryzen 9 PRO 9945 is built on a 4 nm process by TSMC, while the Intel Xeon 6520P uses a 5 nm process from Intel’s own foundry.

Architecture Differences

The foundational architectures of these two processors diverge sharply. The AMD Ryzen 9 PRO 9945 is part of the 9000 series, based on the Zen 5 (Granite Ridge) microarchitecture. It is manufactured on a 4 nm process at TSMC, with a die size of 2x 70.6 mm² and a total of 16,630 million transistors. In contrast, the Intel Xeon 6520P belongs to the Xeon 6 family (Granite Rapids-SP) and is built on Intel’s 5 nm process with a much larger die size of 598 mm².

Core and cache configurations highlight different scaling strategies. The AMD chip features 12 cores and 24 threads, with an L1 cache of 80 KB per core, an L2 cache of 1 MB per core, and a shared L3 cache of 64 MB. The Intel chip doubles the core count to 24 cores and 48 threads, with a larger L1 cache of 112 KB per core, an L2 cache of 2 MB per core, and a significantly larger shared L3 cache of 144 MB. This gives the Intel processor more than double the L3 cache for data-heavy workloads.

Platform support and power characteristics are also divergent. The AMD Ryzen 9 PRO 9945 uses the AMD Socket AM5 and has a thermal design power (TDP) of 65 watts, while the Intel Xeon 6520P uses the Intel Socket 4710 and has a TDP of 210 watts. The AMD processor includes integrated Radeon Graphics, whereas the Intel Xeon 6520P has no integrated graphics. PCIe lanes also differ: the AMD chip provides 24 Gen 5 lanes, while the Intel chip provides 88 Gen 5 lanes, offering far more expansion capability.

Head-to-Head Benchmarks

The benchmark data reveals a consistent pattern: the Intel Xeon 6520P wins in all multi-threaded and throughput-oriented tests, while the AMD Ryzen 9 PRO 9945 excels in single-threaded performance. The most lopsided result is in the PassMark physics test, where the Intel Xeon 6520P scores 7,209 against the AMD’s 2,902, a 59.7% advantage. This suggests the Intel chip is far better suited for simulation and physics-based calculations.

In data compression, the Intel Xeon 6520P scores 841,518 compared to the AMD’s 579,972, a 31.1% lead. Similarly, in data encryption, the Intel chip scores 45,188 versus 30,450, a 32.6% advantage. The extended instructions test shows the Intel Xeon 6520P ahead by 31.3% (64,557 vs. 44,374), and the find prime numbers test shows a 35% lead (526 vs. 342).

Floating-point math is another strong area for the Intel chip, which scores 162,862 against the AMD’s 107,340, a 34.1% difference. Integer math sees a smaller but still significant gap, with the Intel Xeon 6520P scoring 214,288 versus the AMD’s 171,175, a 20.1% lead. Random string sorting follows the trend, with the Intel chip scoring 95,736 versus 62,458, a 34.8% difference. The PassMark multithread score confirms the overall pattern: 62,936 for Intel versus 48,664 for AMD, a 22.7% advantage.

The AMD Ryzen 9 PRO 9945’s only wins are in the single-threaded tests, where it scores 4,619 versus the Intel’s 3,356, a 37.6% improvement. This single-thread advantage is substantial and reflects the AMD chip’s higher boost clock of 5.40 GHz compared to the Intel’s 4.00 GHz.

The Verdict

The data indicates that these processors are optimized for different ends of the performance spectrum. The Intel Xeon 6520P is the clear choice for multi-threaded, data-intensive server workloads. Its 24 cores and 48 threads, combined with 144 MB of L3 cache and eight-channel memory support, make it superior in 9 of 11 benchmark comparisons. The 59.7% lead in physics and the 31%+ leads in compression and encryption underscore its dominance in parallel processing tasks.

However, the AMD Ryzen 9 PRO 9945 is the better option for single-threaded performance and efficiency. Its 37.6% lead in single-thread tests is remarkable, and its 65-watt TDP is a fraction of the Intel’s 210 watts. For workloads that rely heavily on single-core speed or where power consumption is a primary constraint, the AMD chip is the data-backed winner.

The overall average benchmark scores are close, with the AMD at 96,083 and the Intel at 93,786, but the distribution of wins is not. The Intel Xeon 6520P is for maximum throughput, while the AMD Ryzen 9 PRO 9945 is for responsive, efficient computing.

Specification Differences

The two processors differ across several key specifications. The AMD Ryzen 9 PRO 9945 has 12 cores and 24 threads, while the Intel Xeon 6520P has 24 cores and 48 threads. The AMD chip has a base clock of 3.40 GHz and a boost clock of 5.40 GHz, compared to the Intel’s 2.40 GHz base and 4.00 GHz boost. The TDP is dramatically different: 65 watts for AMD versus 210 watts for Intel.

Socket compatibility is unique to each: AMD Socket AM5 for the Ryzen, and Intel Socket 4710 for the Xeon. The process node and foundry also differ, with TSMC’s 4 nm for AMD and Intel’s 5 nm for the Xeon. Cache hierarchies are distinct, with AMD using 80 KB L1 and 1 MB L2 per core and 64 MB shared L3, while Intel uses 112 KB L1 and 2 MB L2 per core with 144 MB shared L3. Memory channels and bandwidth are a major differentiator: dual-channel 89.6 GB/s for AMD versus eight-channel 409.6 GB/s for Intel. PCIe lane counts also diverge, with 24 lanes for AMD and 88 lanes for Intel. The AMD chip includes Radeon integrated graphics, while the Intel has none.

Where Each One Wins

The Intel Xeon 6520P wins in all multi-threaded benchmark categories. This includes data compression, data encryption, extended instructions, find prime numbers, floating-point math, integer math, multithread, physics, and random string sorting. Its biggest advantages are in physics (59.7% ahead), random string sorting (34.8% ahead), and floating-point math (34.1% ahead). The Intel chip’s 24 cores, 48 threads, and massive 144 MB L3 cache make it ideal for rendering, scientific simulations, database processing, and any workload that can utilize many threads simultaneously. The 409.6 GB/s memory bandwidth further supports these heavy data tasks.

The AMD Ryzen 9 PRO 9945 wins in single-threaded performance, with a 37.6% advantage in the PassMark single-thread tests. Its 5.40 GHz boost clock and 4 nm process give it a distinct edge in latency-sensitive applications, such as legacy software, certain database queries, and interactive workloads. The 65-watt TDP also makes it the clear choice for power-constrained environments or systems where heat dissipation is a concern. While it has fewer cores and lower memory bandwidth, its single-thread dominance and efficiency make it a strong contender for workstation tasks that prioritize responsiveness over raw core count.