AMD EPYC 7643P vs Intel Xeon 6732P Comparison

The AMD EPYC 7643P and Intel Xeon 6732P are both elite server processors, landing in the 98th percentile of all CPUs. However, the data reveals a clear split: the AMD EPYC 7643P wins 13 of 17 head-to-head benchmarks, while the Intel Xeon 6732P takes 4. The EPYC’s overall average benchmark score is 144,824, which is 1% higher than the Xeon’s 143,444. This is not a landslide, but the pattern of wins is decisive. The AMD chip dominates in general compute, encryption, and integer-heavy workloads, while the Intel part counters decisively with superior floating-point and extended instruction performance.

Where Each One Wins

The AMD EPYC 7643P is the general-purpose compute champion. Its wins are concentrated in the Cinebench suite, where it leads by 3.3% in every single test, from R15 to R23, in both single-core and multi-core. Beyond rendering, it wins big in PassMark integer math (390,775 vs 334,340, a 16.9% lead), random string sorting (160,274 vs 133,467, a 20.1% lead), and data encryption (95,606 vs 63,848, a massive 49.7% lead). It also edges out the Xeon in the PassMark multithread test (77,307 vs 74,849, a 3.3% lead) and in find prime numbers (651 vs 628, a 3.7% lead). For workloads that rely on traditional integer processing, database-style sorting, or cryptographic operations, the EPYC 7643P is the clear pick.

The Intel Xeon 6732P is a specialist. It wins where the architecture’s strengths lie. Its most significant victory is in PassMark extended instructions, scoring 106,697 against the EPYC’s 67,398 – a 36.8% advantage. It also wins in floating-point math (261,703 vs 216,592, a 17.2% lead), data compression (1,339,480 vs 1,326,051, a 1% lead), and physics (8,109 vs 8,002, a 1.3% lead). This makes the Xeon the better choice for scientific computing, simulation, and other workloads that execute heavy mathematical or vectorized instruction sets. The data suggests the Xeon wins in tasks where its per-core efficiency and instruction set capabilities are more important than raw core count.

Architecture Differences

The two CPUs are built on fundamentally different design philosophies. The AMD EPYC 7643P is a 48-core, 96-thread processor based on the Zen 3 architecture, codenamed Milan. It is fabricated on a 7 nm process by TSMC, utilizing a chiplet design with 8 dies, each measured at 81 mm², totaling 33,200 million transistors. It features 64 KB of L1 cache and 512 KB of L2 cache per core, with a massive 256 MB of shared L3 cache. It supports DDR4 memory across an eight-channel bus, providing 204.8 GB/s of bandwidth. Its PCIe interface is Gen 4 with 128 lanes.

The Intel Xeon 6732P is a 32-core, 64-thread processor based on the Granite Rapids architecture (Granite Rapids-SP). It is built on a 5 nm process by Intel. It offers a larger per-core cache footprint: 112 KB of L1 cache and 2 MB of L2 cache per core, but a smaller 144 MB of shared L3 cache. It supports faster DDR5 memory on an eight-channel bus, doubling the bandwidth to 409.6 GB/s. Its PCIe interface is Gen 5 with 136 lanes. The Intel part also has a significantly higher TDP at 350 W, compared to the AMD’s 225 W.

These architectural choices explain the benchmark results. The EPYC’s higher core count and larger L3 cache are ideal for parallel, multi-threaded tasks. The Xeon’s higher base and boost clocks (3.80 GHz and 4.10 GHz vs 2.30 GHz and 3.60 GHz) and newer memory standard help it in latency-sensitive and memory-bandwidth-heavy single-thread or floating-point tasks. The Xeon’s per-core L2 cache is 4x larger, which can be exploited by workloads with high data locality.

Head-to-Head Benchmarks

The most significant discrepancy lies in specialized workloads. In PassMark data encryption, the AMD EPYC 7643P scores 95,606, which is 49.7% higher than the Intel’s 63,848. This is the single largest margin of victory for either chip. Conversely, the Intel Xeon 6732P’s 106,697 score in extended instructions is 36.8% higher than the AMD’s 67,398. This shows a clear trade-off: the EPYC is dramatically better at cryptographic workloads, while the Xeon is decisively better at executing complex, vectorized instruction sets.

In the Cinebench suite, the AMD is consistently ahead. In Cinebench R20 multi-core, it scores 27,598 vs 26,720, a 3.3% lead. The single-core R20 score is 3,895 vs 3,772, also a 3.3% lead. This pattern repeats in R23, with the AMD scoring 65,710 multi-core and 9,276 single-core, against the Intel’s 63,621 and 8,981. The AMD’s single-core advantage of 3.3% in Cinebench R23 is notable, given the Intel’s higher clock speed; it suggests the Zen 3 architecture has superior instructions-per-clock efficiency in this rendering workload.

In PassMark integer math, the AMD dominates with 390,775 against 334,340, a 16.9% lead. It also wins decisively in random string sorting, scoring 160,274 against 133,467, a 20.1% lead. The Intel fights back in floating-point math, scoring 261,703 against 216,592, a 17.2% lead. The results indicate the AMD processor is better suited for general-purpose integer and sorting tasks, while the Intel processor is more capable for scientific and simulation workloads that rely on floating-point calculations. The Intel also wins in data compression, but by a narrow 1% margin (1,339,480 vs 1,326,051), and in physics by 1.3% (8,109 vs 8,002).

Specification Differences

The specification sheet highlights the stark differences in design goals. The AMD EPYC 7643P has 48 cores and 96 threads, while the Intel Xeon 6732P has 32 cores and 64 threads. The Intel’s base clock is 3.80 GHz and boost clock is 4.10 GHz, significantly higher than the AMD’s 2.30 GHz base and 3.60 GHz boost. The Intel part has a TDP of 350 W, versus the AMD’s 225 W.

The cache hierarchies are distinct. The AMD offers 64 KB of L1 and 512 KB of L2 per core, with 256 MB of shared L3. The Intel offers 112 KB of L1 and 2 MB of L2 per core, with 144 MB of shared L3. The memory support differs: the AMD uses DDR4 with 204.8 GB/s bandwidth, while the Intel uses DDR5 with 409.6 GB/s bandwidth. Both use an eight-channel memory bus. The PCIe generation and lane count also differ: the AMD has Gen 4 with 128 lanes, while the Intel has Gen 5 with 136 lanes. The process node differs, with the AMD on TSMC’s 7 nm and the Intel on its own 5 nm process. The Intel has a larger per-core L1 and L2 cache, while the AMD has a much larger total L3 cache. The launch MSRP for the AMD is $2722, and for the Intel it is $5295.

FAQ

Q: Which CPU is faster in multi-core rendering?

A: The AMD EPYC 7643P. It wins all Cinebench multi-core tests by 3.3%, including a 65,710 score in R23 multi-core versus the Intel’s 63,621.

Q: Which CPU is better for data encryption?

A: The AMD EPYC 7643P is overwhelmingly better. It scores 95,606 in PassMark data encryption, which is 49.7% higher than the Intel Xeon 6732P’s 63,848.

Q: Which CPU has the advantage in floating-point math?

A: The Intel Xeon 6732P. It scores 261,703 in PassMark floating-point math, which is 17.2% higher than the AMD’s 216,592.

Q: How do their core counts compare?

A: The AMD EPYC 7643P has 48 cores and 96 threads, while the Intel Xeon 6732P has 32 cores and 64 threads.

Q: Which CPU supports more memory bandwidth?

A: The Intel Xeon 6732P supports DDR5 memory with a bandwidth of 409.6 GB/s, which is double the AMD EPYC 7643P’s DDR4 bandwidth of 204.8 GB/s.

Q: Which CPU has a higher average benchmark score?

A: The AMD EPYC 7643P has an average benchmark score of 144,824, which is 1% higher than the Intel Xeon 6732P’s 143,444.

The Verdict

The data points to a clear choice for most users: the AMD EPYC 7643P. It is the more balanced and capable processor for the majority of server and workstation workloads. Its 13 wins out of 17 benchmarks, including a perfect sweep of the Cinebench suite, make it the superior general-purpose compute part. The 49.7% lead in encryption is a massive differentiator for security-focused applications. Its 16.9% lead in integer math and 20.1% lead in random string sorting indicate strong performance in database and data-processing tasks. The higher core count and larger L3 cache deliver tangible results in multi-threaded environments.

The Intel Xeon 6732P is the specialist’s choice. It is the better option only if your workload is dominated by floating-point math or extended instruction sets, where it leads by 17.2% and 36.8%, respectively. The higher memory bandwidth (409.6 GB/s vs 204.8 GB/s) could also be beneficial for memory-bound scientific simulations. However, its smaller core count and lower average benchmark score mean it cannot match the AMD’s overall throughput. The data suggests that for a typical mixed server environment, the AMD EPYC 7643P is the safer and more powerful choice. The Intel part is only recommended if the specific application can exploit its unique architectural strengths in floating-point and vectorized compute.