AMD EPYC 7643P vs Intel Xeon 6740E Comparison

The Intel Xeon 6740E and the AMD EPYC 7643P occupy the same server and workstation segment, but the recorded data shows they get there by completely different routes. The Xeon 6740E is a Sierra Forest part built on Intel's 5 nm process with 96 efficiency-focused cores running one thread each, while the EPYC 7643P is a Zen 3 Milan design with 48 cores and SMT delivering 96 threads. Across the database's head-to-head suite, the EPYC 7643P wins 11 of 17 tests, yet the Xeon 6740E's six wins include some of the largest margins on the page: a 34.7 percent lead in data compression, 43.4 percent in encryption, and 42.8 percent in floating point math. Both CPUs sit at the very top of the historical stack, with the Xeon at the 99th percentile against all recorded CPUs and the EPYC at the 98th. The Intel Xeon 6740E carries a launch MSRP of $5265 and the AMD EPYC 7643P a launch MSRP of $2722.

Head-to-Head Benchmarks

Start with the Cinebench suite, because it is the clearest sweep in the data. The AMD EPYC 7643P wins every single Cinebench test, and by an unusually consistent margin: 6623 versus 6525 in Cinebench R15 multi-core (a 1.5 percent gap), 27598 versus 27191 in R20 multi-core, and 65710 versus 64741 in R23 multi-core. Single-core tells the same story at the same scale: 934 versus 921 in R15, 3895 versus 3838 in R20, and 9276 versus 9140 in R23, all roughly 1.4 to 1.5 percent in AMD's favor. Rendering, in other words, is effectively a coin flip on throughput but a consistent, if narrow, AMD win on responsiveness.

The Passmark suite fractures that picture. The AMD chip takes Passmark multithread narrowly, 77307 to 76167, and wins physics at 8002 to 7608, a 4.9 percent gap. Its biggest single victory is single-thread: 2655 against the Xeon's 1997, a 24.8 percent lead that reflects the Zen 3 core's higher boost clock of 3.60 versus 3.20. Find prime numbers also goes to AMD at 651 versus 526, a 19.2 percent difference.

Then the Xeon 6740E takes over. Data encryption is a 43.4 percent blowout, 137106 to 95606. Floating point math lands at 42.8 percent in Intel's favor, 309333 to 216592. Random string sorting goes to Intel by 37.7 percent, 220684 to 160274, and data compression by 34.7 percent, 1786845 to 1326051. Integer math (457614 to 390775) and extended instructions (78968 to 67398) round out Intel's wins at 17.1 and 17.2 percent respectively. These are not narrow margins. On memory-bandwidth-hungry and SIMD-heavy compute kernels, the Xeon's eight-channel DDR5 subsystem with 409.6 GB/s of bandwidth, double the EPYC's 204.8 GB/s, appears to be the decisive factor.

The aggregate scores capture this split. The Xeon 6740E averages 187718 across the database, sitting 1.4 percent ahead of the AMD EPYC 8534P, 2.7 percent ahead of the AMD Ryzen Threadripper PRO 9975WX, but 3 percent behind the Intel Xeon 678X and 3.4 percent behind the AMD EPYC 9335. The EPYC 7643P averages 144824, essentially tied with the Intel Xeon w9-3575X (0.3 percent), the AMD Ryzen 9 PRO 9965X3D (0.8 percent), and the Intel Xeon 6732P (1 percent), and 0.6 percent behind the AMD Ryzen 9 PRO 9965.

The Verdict

The data points in two directions depending on the workload, and the dividing line is clean. If the deployment is rendering, physics simulation, or any application dominated by per-core speed and lightly threaded responsiveness, the EPYC 7643P is the pick: it wins all six Cinebench results, plus multithread, physics, prime finding, and a 24.8 percent single-thread advantage. If the deployment is bulk data processing, the Xeon 6740E is the stronger recorded performer, with leads between roughly 17 and 43 percent in compression, encryption, sorting, floating point, integer math, and extended instructions. Raw thread count alone does not decide anything here, since 96 physical cores without SMT and 48 cores with SMT end up within 1.5 percent of each other in multi-threaded rendering and aggregate Passmark throughput. Both are elite parts, at the 99th and 98th percentiles of all CPUs in the database, so neither is a downgrade in absolute terms.

Architecture Differences

These two CPUs come from opposite design philosophies. The Xeon 6740E uses the Sierra Forest architecture on Intel's 5 nm node, part of the Xeon 6 generation (Sierra Forest-SP). It has 96 cores and 96 threads, meaning no simultaneous multithreading, with a 2.40 base and 3.20 boost clock and a 250 W TDP. Its cache hierarchy is unusual: 96 KB of L1 per core, a comparatively small 4 MB of L2 per module, and 96 MB of shared L3. The die is a single 578 mm² piece.

The EPYC 7643P is the Zen 3-based Milan generation of the EPYC line, fabbed by TSMC on 7 nm with roughly 33,200 million transistors spread across a chiplet layout of 8x 81 mm² dies. It pairs 48 cores with 96 threads via SMT, runs a 2.30 base and a notably higher 3.60 boost clock, and has a 225 W TDP. Its cache is far deeper where it counts for many server workloads: 512 KB of L2 per core and 256 MB of shared L3, more than double the Xeon's L3 capacity.

Platform I/O also diverges sharply. The Xeon supports DDR5 across an eight-channel bus at 409.6 GB/s with 88 PCIe 5 lanes from the CPU. The EPYC supports DDR4 across an eight-channel bus at 204.8 GB/s but offers 128 PCIe 4 lanes. Both support ECC memory and both ship in an active production status with locked multipliers. Sockets differ, naturally: Intel Socket 4710 versus AMD Socket SP3. The Xeon 6740E launched on 2024-06-02; the EPYC 7643P's recorded release date is 2023-09-04.

FAQ

Q: Which CPU is faster overall in the recorded benchmarks?

A: The AMD EPYC 7643P wins more tests, 11 of 17, but mostly by narrow margins around 1.5 percent. The Intel Xeon 6740E wins only 6 tests, yet its wins range from 17.1 to 43.4 percent, and its average benchmark score of 187718 is well above the EPYC's 144824.

Q: Which one has better single-thread performance?

A: The EPYC 7643P, clearly, in the Passmark metric: 2655 versus 1997, a 24.8 percent lead. In Cinebench single-core the gap shrinks to roughly 1.4 to 1.5 percent, still in AMD's favor across R15, R20, and R23.

Q: How do 96 Intel cores lose to 48 AMD cores in multi-core tests?

A: The EPYC's SMT gives it the same 96-thread capacity, and its cores boost to 3.60 versus the Xeon's 3.20, which is why rendering and multithread results land within 1.5 percent of each other.

Q: Where does the Xeon 6740E dominate?

A: In data-centric Passmark workloads: encryption by 43.4 percent, floating point math by 42.8 percent, string sorting by 37.7 percent, and compression by 34.7 percent. Its 409.6 GB/s of DDR5 bandwidth, double the EPYC's, is the standout platform advantage.

Q: Which platform has more PCIe connectivity?

A: The EPYC 7643P, with 128 CPU PCIe 4 lanes versus the Xeon's 88 PCIe 5 lanes. The Xeon's lanes are newer-generation and faster per lane, so total bandwidth and device count trade off differently.

Q: Do both support ECC memory?

A: Yes, both list ECC support. The Xeon uses DDR5 and the EPYC uses DDR4.

Where Each One Wins

Pick the Intel Xeon 6740E for workloads where the recorded data shows it pulling away: encryption and security processing, floating point and integer number crunching, data compression, and large-scale string sorting. Every one of those categories shows a double-digit margin, up to 43.4 percent. Its doubled memory bandwidth also makes it the safer choice for throughput-bound pipelines that stream large datasets through eight channels of DDR5. In the database context, it ranks in the 99th percentile of all CPUs, ahead of rivals like the AMD EPYC 8534P and the Ryzen Threadripper PRO 9975WX, though behind the Intel Xeon 678X and AMD EPYC 9335.

Pick the AMD EPYC 7643P for rendering farms, physics-driven simulation, and mixed workloads where per-license or per-task latency matters. It wins every Cinebench variant, wins Passmark physics by 4.9 percent, wins prime number search by 19.2 percent, and carries a 24.8 percent single-thread advantage that benefits any serially bottlenecked stage of a pipeline. Its 256 MB of shared L3 and 128 PCIe 4 lanes favor deployments with many attached devices or cache-sensitive services, and it sits in the 98th percentile, statistically tied with the Xeon w9-3575X and the Ryzen 9 PRO 9965X3D in its own neighborhood.

Specification Differences

| Field | Intel Xeon 6740E | AMD EPYC 7643P |

|---|---|---|

| Architecture | Sierra Forest | Zen 3 (Milan) |

| Process node | 5 nm (Intel) | 7 nm (TSMC) |

| Cores | 96 | 48 |

| Threads | 96 | 96 |

| Base clock | 2.40 | 2.30 |

| Boost clock | 3.20 | 3.60 |

| TDP | 250 W | 225 W |

| L1 cache | 96 KB per core | 64 KB per core |

| L2 cache | 4 MB per module | 512 KB per core |

| L3 cache | 96 MB shared | 256 MB shared |

| Memory | DDR5 | DDR4 |

| Memory bandwidth | 409.6 GB/s | 204.8 GB/s |

| PCIe | Gen 5, 88 lanes | Gen 4, 128 lanes |

| Socket | Intel Socket 4710 | AMD Socket SP3 |

| Die configuration | 578 mm² single die | 8x 81 mm² chiplets, 33,200 million transistors |

| Release date | 2024-06-02 | 2023-09-04 |

Both parts share the server/workstation segment, eight-channel memory buses, ECC support, locked multipliers, and active production status, so the differences above are the ones that matter when choosing between them.