AMD EPYC 7643P vs Intel Xeon 6737P Comparison

The AMD EPYC 7643P and Intel Xeon 6737P represent two distinct approaches to server processing, with the data revealing a clear split between raw computational throughput and specialized workload acceleration. The EPYC 7643P, a 48-core Zen 3 part, wins 4 of the 16 head-to-head benchmarks, while the 32-core Xeon 6737P claims victory in 12, yet the margin of those victories tells a more nuanced story than the win count alone. Average benchmark scores place the AMD part at 144,824 versus 140,694 for Intel, a 2.9% gap in favor of the EPYC, despite the Xeon’s superior performance in most individual tests.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7643P has 48 cores and 96 threads, while the Intel Xeon 6737P has 32 cores and 64 threads. The AMD part offers 50% more cores and 50% more threads than its Intel counterpart.

Q: How do the two compare in single-threaded performance?

A: The Intel Xeon 6737P is decisively ahead in single-threaded workloads. In PassMark single-thread testing, Intel scores 3048 versus AMD’s 2655, a 12.9% advantage. Cinebench R23 single-core shows a smaller but consistent lead: 963 versus 934 for Intel.

Q: Which chip wins in memory bandwidth?

A: The Intel Xeon 6737P doubles the memory bandwidth, rated at 409.6 GB/s versus 204.8 GB/s for the EPYC 7643P. Both use eight-channel memory buses, but Intel supports DDR5 while AMD uses DDR4.

Q: What is the biggest single benchmark margin between the two?

A: The largest gap is in PassMark data encryption, where the AMD EPYC 7643P scores 95,606 against Intel’s 65,615, a 45.7% advantage. This is the only test where AMD leads by more than 25%.

Q: Are both processors in the same performance percentile?

A: Yes, both sit at the 98th percentile among all CPUs according to the database. Despite their architectural differences, they are rated equally in overall standing, though their average benchmark scores differ by 2.9%.

Q: Which processor has the higher launch MSRP?

A: The Intel Xeon 6737P has a launch MSRP of $4995, while the AMD EPYC 7643P has a launch MSRP of $2722. The Intel part is priced substantially higher.

Architecture Differences

The two processors come from fundamentally different design philosophies. The AMD EPYC 7643P is built on the Zen 3 architecture, codenamed Milan, using a 7 nm process at TSMC with 33,200 million transistors spread across an 8x 81 mm² die configuration. In contrast, the Intel Xeon 6737P uses the Granite Rapids architecture, fabricated on Intel’s 5 nm process with a single 598 mm² die. This process node difference is significant: AMD’s older 7 nm node is offset by a chiplet design, while Intel’s monolithic 5 nm die packs transistors more densely.

Cache hierarchies diverge sharply. The EPYC 7643P allocates 64 KB of L1 and 512 KB of L2 per core, with a massive 256 MB of shared L3 cache. The Xeon 6737P gives each core 112 KB of L1 and 2 MB of L2, but its shared L3 is only 144 MB. AMD’s L3 cache is 77.8% larger, which likely explains its dominance in data-heavy workloads like compression and encryption. Intel compensates with larger per-core L2 cache, which is 4x bigger per core.

Memory technology separates them further. The EPYC 7643P uses DDR4 with 204.8 GB/s bandwidth, while the Xeon 6737P supports DDR5 at 409.6 GB/s. Both have eight-channel memory buses and ECC support. PCIe capabilities also differ: AMD provides Gen 4 with 128 lanes, while Intel offers Gen 5 with 88 lanes. Intel’s newer PCIe standard doubles per-lane bandwidth but reduces lane count by 31.3%. The Xeon 6737P lists integrated graphics as "N/A," while the EPYC 7643P has no integrated graphics listed at all.

Head-to-Head Benchmarks

The Cinebench suite shows a consistent pattern: Intel wins every multi-core and single-core test by nearly identical margins. In Cinebench R15 multi-core, Intel scores 6822 versus AMD’s 6623, a 2.9% lead. R20 multi-core shows 28,428 against 27,598, again 2.9% ahead. R23 multi-core follows with 67,688 versus 65,710, another 2.9% margin. Single-core tests are similarly consistent: R15 gives Intel 963 versus 934 (3% ahead), R20 gives 4013 versus 3895 (2.9%), and R23 shows the same 2.9% gap. The PassMark multithread test mirrors this, with Intel at 79,634 versus AMD’s 77,307, a 2.9% difference. Across all five Cinebench tests and multithread, Intel’s margin never deviates from 2.9-3%.

Outside the Cinebench family, the picture shifts dramatically. AMD wins PassMark integer math with 390,775 versus 330,756, an 18.1% advantage. Random string sorting goes to AMD at 160,274 versus 129,510, a 23.8% lead. Data compression shows AMD at 1,326,051 versus 1,157,255, a 14.6% win. The encryption test is AMD’s biggest victory: 95,606 versus 65,615, a 45.7% margin.

Intel counterattacks in other PassMark tests with large margins. Extended instructions show Intel at 105,453 versus 67,398, a 36.1% lead. Floating point math favors Intel at 258,811 versus 216,592, a 16.3% gap. Physics testing gives Intel 9362 versus 8002, a 14.5% win. Prime number finding is closer: 697 versus 651, a 6.6% margin. Single-thread performance shows Intel at 3048 versus 2655, a 12.9% lead.

Specification Differences

The core count difference is stark: 48 cores for AMD versus 32 for Intel, with corresponding thread counts of 96 and 64. Clock speeds favor Intel, which runs at 2.90 GHz base and 4.00 GHz boost, while AMD sits at 2.30 GHz base and 3.60 GHz boost. Intel’s boost clock is 11.1% higher, and its base clock is 26.1% higher. Thermal design power reverses the trend: Intel draws 270 W against AMD’s 225 W, an 20% higher TDP.

Sockets are incompatible: AMD uses Socket SP3, while Intel uses Socket 4710. Process technology differs as noted, with AMD on 7 nm and Intel on 5 nm. Transistor count is listed only for AMD at 33,200 million; Intel’s is not provided. Die size is listed as 8x 81 mm² for AMD versus 598 mm² for Intel. Cache specifications differ across all levels, with AMD’s L3 at 256 MB versus Intel’s 144 MB, but Intel’s per-core L1 and L2 are larger. Memory support differs: DDR4 for AMD, DDR5 for Intel. Memory bandwidth doubles for Intel at 409.6 GB/s versus 204.8 GB/s. PCIe generation and lane count differ: Gen 4 with 128 lanes for AMD, Gen 5 with 88 lanes for Intel. Release dates show AMD launched on 2023-09-04, while Intel came later on 2025-02-23. Part numbers are 100-000001285 for AMD and SRVNZ for Intel. Neither has an unlocked multiplier.

Where Each One Wins

The AMD EPYC 7643P wins in workloads that stress integer arithmetic, data movement, and security. Its 18.1% lead in integer math suggests strong general-purpose compute for database operations and business logic. The 23.8% advantage in random string sorting points to text processing, log analysis, and data serialization tasks. Data compression at 14.6% ahead indicates file storage and transfer workloads benefit. The encryption win at 45.7% is the standout: cryptographic operations, SSL/TLS termination, and secure data handling are clearly AMD’s domain.

The Intel Xeon 6737P dominates in scientific and numerical computing. The 36.1% lead in extended instructions implies AVX-512-like workloads such as AI inference, signal processing, and scientific simulation. Floating point math at 16.3% ahead confirms this orientation toward numerical analysis. Physics simulation at 14.5% higher reinforces the scientific computing profile. Prime number finding at 6.6% ahead is a smaller but consistent win. Single-thread performance at 12.9% higher makes Intel the choice for latency-sensitive, low-concurrency tasks. The Cinebench family wins at 2.9% across the board suggest better sustained multi-core rendering performance per clock.

The Verdict

The data indicates that the AMD EPYC 7643P is the superior choice for data-centric and security-focused server roles. Its 45.7% encryption advantage and 23.8% string sorting lead are dramatic, and the 18.1% integer math win supports transactional databases and application servers. The larger 256 MB L3 cache appears to drive these wins in memory-intensive operations. For workloads involving compression, encryption, and high-concurrency integer processing, the EPYC 7643P’s 48 cores and 96 threads provide more parallel capacity despite lower clock speeds.

The Intel Xeon 6737P is the pick for compute-heavy scientific and engineering workloads. The 36.1% extended instructions lead and 16.3% floating point advantage make it ideal for modeling, simulation, and data analysis requiring heavy numerical computation. The 12.9% single-thread win and higher 4.00 GHz boost clock benefit applications with limited parallelism or strict latency requirements. The 2.9% consistent Cinebench wins suggest better rendering performance for visualization tasks. However, the higher TDP of 270 W and the larger launch MSRP of $4995 versus $2722 must be weighed against the performance gains.

The final decision rests on workload profile. AMD wins where data volume and security matter; Intel wins where raw compute density and single-thread speed matter. The 98th percentile ranking for both confirms either is a high-end choice, but the benchmark data strongly suggests matching the processor to the dominant workload type rather than seeking an all-around winner.