AMD EPYC 7513 vs Intel Xeon 6521P Comparison

The Intel Xeon 6521P and AMD EPYC 7513 are both 97th-percentile server processors, but the benchmark data reveals two very different performance profiles. The Intel part wins 14 of 17 head-to-head tests, while the AMD chip takes three, with the margins ranging from a razor-thin 0.1% to a dominant 47.4%. This is not a case of one chip being simply faster everywhere; it is a split between Intel's superior single-thread and floating-point work versus AMD's edge in encryption and integer throughput.

Head-to-Head Benchmarks

The most striking pattern across the Cinebench suite is the consistency of Intel's victory. In Cinebench R15, R20, and R23, the Xeon 6521P wins both single-core and multi-core tests by a nearly identical margin of 12.3% to 12.4%. For example, the R23 multi-core score is 56,658 for Intel versus 50,431 for AMD, while the single-core score is 7,998 versus 7,119. This uniformity suggests a fundamental architectural advantage rather than a workload-specific quirk. The PassMark multi-thread test confirms the trend with a 12.3% lead (66,657 vs. 59,331), and the physics test shows a 16.7% gap (5,972 vs. 5,118) in Intel's favor.

Where Intel truly runs away is in the specialized PassMark workloads. The find prime numbers test shows a 47.4% advantage (560 vs. 380), the extended instructions test shows a 29% lead (72,820 vs. 56,451), and the single-thread test shows a 30.6% edge (3,238 vs. 2,479). Floating-point math also goes to Intel by 17.9% (178,828 vs. 151,713). Data compression is closer, with Intel winning by just 3.8% (967,721 vs. 932,240). These results paint a picture of a chip that is dramatically stronger per-core and in math-heavy tasks.

The AMD EPYC 7513 fights back in three specific areas. Its biggest win is in data encryption, where it scores 63,628 versus Intel's 51,221, a 19.5% margin. It also takes integer math by 9.5% (272,145 vs. 246,263) and random string sorting by a hair-thin 0.1% (104,660 vs. 104,517). The encryption result is particularly notable because it is the only test where AMD wins by a double-digit margin, suggesting a dedicated hardware advantage for cryptographic workloads. The integer math win is also significant, as it contradicts the general trend of Intel dominance in compute-heavy tasks.

Architecture Differences

The two CPUs come from entirely different design philosophies and manufacturing generations. The Intel Xeon 6521P is built on the Granite Rapids architecture, using a 5 nm process from Intel's own foundry, and it was released in February 2025. The AMD EPYC 7513 uses the Zen 3 architecture, codenamed Milan, manufactured on a 7 nm process by TSMC, with a release date of March 2021. This four-year gap in release timing explains much of the performance delta.

Core and cache configurations differ substantially. Intel packs 24 cores and 48 threads, while AMD offers 32 cores and 64 threads. Despite having fewer cores, Intel's L3 cache is larger at 144 MB shared, versus AMD's 128 MB shared. Per-core cache allocations are also different: Intel has 112 KB of L1 and 2 MB of L2 per core, while AMD has 64 KB of L1 and 512 KB of L2 per core. The Intel die is a single 598 mm² piece, whereas AMD uses a chiplet design with 8 dies of 81 mm² each, totaling 33,200 million transistors.

Memory and I/O represent another generational divide. Intel supports DDR5 memory with a bandwidth of 409.6 GB/s, double the 204.8 GB/s of AMD's DDR4 support. Both use eight-channel memory buses and support ECC. For expansion, Intel offers PCIe Gen 5 with 136 lanes, while AMD is limited to PCIe Gen 4 with 128 lanes. The Intel part also has a higher TDP at 225 watts versus AMD's 200 watts, and it uses the Intel Socket 4710, while AMD uses Socket SP3.

FAQ

Q: Which processor is faster in single-threaded applications?

A: The Intel Xeon 6521P wins all single-thread tests by large margins. It scores 3,238 versus 2,479 in PassMark single-thread (30.6% ahead), and leads by 12.4% in Cinebench R15, R20, and R23 single-core tests.

Q: Does the AMD EPYC 7513 win any benchmark?

A: Yes, it wins three head-to-head tests. It leads by 19.5% in data encryption (63,628 vs. 51,221), by 9.5% in integer math (272,145 vs. 246,263), and by 0.1% in random string sorting (104,660 vs. 104,517).

Q: How do the core counts compare?

A: The AMD EPYC 7513 has 32 cores and 64 threads, while the Intel Xeon 6521P has 24 cores and 48 threads. Despite having fewer cores, Intel wins the multi-threaded Cinebench tests by about 12.3%.

Q: What is the memory bandwidth difference?

A: Intel supports DDR5 with 409.6 GB/s bandwidth, exactly double the 204.8 GB/s of AMD's DDR4 support. Both use eight-channel memory buses with ECC support.

Q: Which processor has a higher boost clock?

A: The Intel Xeon 6521P boosts to 4.10 GHz, while the AMD EPYC 7513 boosts to 3.65 GHz. Both have a base clock of 2.60 GHz.

Q: How do their average benchmark scores compare?

A: The Intel Xeon 6521P has an average benchmark score of 105,845, while the AMD EPYC 7513 scores 102,244. This represents a 3.4% advantage for Intel, as shown in AMD's nearest rivals data.

Specification Differences

The key specification gaps are stark. Intel uses a 5 nm process, while AMD uses 7 nm. Intel has 24 cores/48 threads versus AMD's 32 cores/64 threads. The L3 cache is 144 MB on Intel versus 128 MB on AMD, but AMD's L1 and L2 caches per core are smaller (64 KB and 512 KB, respectively) compared to Intel's (112 KB and 2 MB). Memory support differs completely: DDR5 on Intel with 409.6 GB/s bandwidth versus DDR4 on AMD with 204.8 GB/s. PCIe generations also differ: Gen 5 with 136 lanes on Intel versus Gen 4 with 128 lanes on AMD. The TDP is 225 watts for Intel and 200 watts for AMD. The die size is 598 mm² for Intel versus 8x 81 mm² for AMD, and AMD lists 33,200 million transistors while Intel does not disclose this figure. Release dates are February 2025 for Intel and March 2021 for AMD.

Where Each One Wins

The Intel Xeon 6521P is the clear choice for workloads that depend on per-core performance, floating-point math, and the latest platform features. The 30.6% lead in PassMark single-thread and 29% lead in extended instructions make it superior for database query processing, scientific simulations, and any application where a single thread's speed is the bottleneck. The 47.4% advantage in prime number finding and 17.9% lead in floating-point math further solidify its position for computational research and financial modeling. The DDR5 memory support and doubled bandwidth (409.6 GB/s vs. 204.8 GB/s) also benefit memory-bandwidth-intensive tasks like large in-memory databases or analytics workloads. Similarly, the PCIe Gen 5 support with 136 lanes provides more headroom for high-speed storage arrays and accelerators.

The AMD EPYC 7513 wins in a narrower but well-defined set of scenarios. The 19.5% lead in data encryption makes it the better choice for VPN gateways, secure web servers, and any workload performing heavy TLS/SSL termination. The 9.5% win in integer math suggests an edge in certain types of compilation or integer-heavy data processing. The 32-core count provides more parallel threads for highly threaded workloads, even if the per-core performance is lower, and the 200-watt TDP is 25 watts lower than Intel's, which could reduce cooling requirements in dense server deployments.

The Verdict

The data directs buyers toward the Intel Xeon 6521P for the majority of modern server workloads. It wins 14 of 17 benchmarks, including every Cinebench test, all single-thread tests, and the multi-thread test, despite having 8 fewer cores. The consistent 12.3% to 12.4% margins across the Cinebench suite indicate a balanced generational improvement, while the 30.6% single-thread lead and 29% extended instructions advantage show clear superiority in latency-sensitive tasks. The newer platform features—DDR5, PCIe Gen 5, and double the memory bandwidth—further tilt the scales toward Intel for new server builds. The launch MSRP for Intel is $1250.

The AMD EPYC 7513 remains a viable option only for specific use cases. If your workload is dominated by encryption and integer math, the 19.5% and 9.5% wins respectively could translate into meaningful throughput gains. The higher core count (32 vs. 24) provides more raw parallelism for embarrassingly parallel workloads, although the benchmark data shows Intel still wins the multi-thread tests. For organizations already invested in the SP3 platform or with workloads that specifically benefit from AMD's encryption acceleration, the EPYC 7513 is competitive. However, the data shows that for general-purpose computing, the Intel Xeon 6521P is the faster processor in nearly every measurable category.