AMD EPYC 9684X vs Intel Xeon 678X Comparison

The AMD EPYC 9684X and Intel Xeon 678X represent two very different approaches to server processing. The data shows a clear split: the EPYC dominates multi-threaded and memory-intensive workloads, while the Xeon offers a significant single-thread advantage. This analysis breaks down the recorded benchmark scores to determine which processor fits specific use cases.

Head-to-Head Benchmarks

The most decisive victories for the AMD EPYC 9684X come in specialized compute tasks. In the PassMark physics test, the EPYC scores 24686 against the Xeon's 7809, a massive 216.1% advantage. This suggests a large edge in workloads that rely heavily on floating-point simulation and physical modeling. The margin is similarly stark in integer-heavy tasks: PassMark integer math shows the EPYC at 844145 versus 405075, a 108.4% lead. The data pattern continues with data encryption, where the EPYC's 178453 score doubles the Xeon's 83598, a 113.5% difference.

The gap narrows but remains substantial in standard multi-core rendering benchmarks. In Cinebench R23 multi-core, the EPYC scores 103355 against the Xeon's 83775, a 23.4% lead. This same 23.4% delta appears consistently across Cinebench R15 multi-core (10418 vs 8444), R20 multi-core (43409 vs 35185), and the PassMark multi-thread test (121595 vs 98559). This consistency indicates that the EPYC's advantage scales predictably across different rendering engines and thread-saturation levels.

The EPYC also wins memory and data movement tests. PassMark data compression shows a 59.6% advantage (2698807 vs 1690896), and random string sorting shows a 112.7% lead (349126 vs 164102). These tests are sensitive to cache size and memory bandwidth, where the EPYC's specifications suggest a structural advantage. The single exception to the EPYC sweep is single-thread performance. The Intel Xeon 678X wins the PassMark single-thread test with a score of 3758 versus the EPYC's 2891, a 23.1% advantage. This is the only category where the Xeon demonstrates superiority.

Architecture Differences

The fundamental architectural split explains the benchmark results. The AMD EPYC 9684X is built on the Zen 4 architecture (Genoa-X codename) with a 5 nm process from TSMC. It packs 96 cores and 192 threads on a socket SP5 platform. The Intel Xeon 678X uses the Granite Rapids architecture with a 5 nm process from Intel, featuring 48 cores and 96 threads on socket 4710.

Cache configuration is the most dramatic differentiator. The EPYC 9684X carries an enormous 1152 MB of shared L3 cache, with 1 MB L2 per core. The Xeon 678X has 192 MB of shared L3 and 2 MB L2 per core. The EPYC's L3 cache is six times larger, which directly explains its massive wins in data compression and random string sorting, as larger caches reduce memory traffic for repeated data patterns.

Clock speeds favor the Intel part. The Xeon 678X boosts to 4.90 GHz from a 2.40 GHz base. The EPYC 9684X boosts to 3.70 GHz from a 2.55 GHz base. This higher boost clock is the primary driver behind the Xeon's single-thread win, as it can push a single core much higher than the EPYC's design allows.

Memory channels differ as well. The EPYC supports twelve-channel DDR5 with a recorded bandwidth of 460.8 GB/s. The Xeon uses eight-channel DDR5 with 409.6 GB/s. Both support ECC memory and PCIe Gen 5 with 128 lanes. The EPYC's wider memory bus contributes to its performance in bandwidth-limited workloads.

The Verdict

The data points to a clear conclusion for workload allocation. Choose the AMD EPYC 9684X for any workload that can use more than a few cores. It wins 14 of the 16 recorded head-to-head benchmarks. Its multi-threaded performance is consistently 23.4% ahead of the Xeon in Cinebench and PassMark multi-core tests. For database workloads, data compression, encryption, and floating-point simulation, the EPYC is the superior choice by a wide margin. Its 96-core count and massive L3 cache make it a server-class workhorse.

Choose the Intel Xeon 678X for workloads that are strictly single-threaded. Its 23.1% advantage in the PassMark single-thread test is the only benchmark win, but it is a meaningful one. If your application is poorly parallelized and depends on peak clock speed, the Xeon's 4.90 GHz boost clock will deliver faster response times. The Xeon also offers a more modest platform footprint with 48 cores, which may suit smaller deployments.

The average benchmark data reflects this split. The EPYC 9684X has an average score of 266914, placing it in the 99th percentile of all CPUs. The Xeon 678X averages 193477, also in the 99th percentile. The EPYC sits 6.1% ahead of the Intel Xeon 6980P and 4.6% behind the AMD Ryzen Threadripper 9970X. The Xeon 678X sits 0.4% behind the AMD EPYC 9335 and 3.1% ahead of the Intel Xeon 6740E.

FAQ

Q: Which processor is faster for multi-core rendering?

A: The AMD EPYC 9684X is faster in every multi-core benchmark. It leads by 23.4% in Cinebench R15, R20, and R23 multi-core tests, scoring 10418, 43409, and 103355 respectively, versus the Xeon's 8444, 35185, and 83775.

Q: Does the Intel Xeon 678X win any benchmarks?

A: Yes, the Xeon 678X wins the PassMark single-thread test with a score of 3758, a 23.1% advantage over the EPYC's 2891. This is its only recorded victory in the head-to-head data.

Q: How does the L3 cache compare between the two?

A: The AMD EPYC 9684X has 1152 MB of shared L3 cache. The Intel Xeon 678X has 192 MB of shared L3 cache. The EPYC's cache is six times larger.

Q: What are the core counts for each processor?

A: The AMD EPYC 9684X has 96 cores and 192 threads. The Intel Xeon 678X has 48 cores and 96 threads.

Q: Which processor has a higher boost clock?

A: The Intel Xeon 678X boosts to 4.90 GHz. The AMD EPYC 9684X boosts to 3.70 GHz. The Xeon's higher boost clock contributes to its single-thread win.

Q: What is the memory bandwidth difference?

A: The AMD EPYC 9684X supports twelve-channel DDR5 with 460.8 GB/s bandwidth. The Intel Xeon 678X supports eight-channel DDR5 with 409.6 GB/s bandwidth.

Where Each One Wins

The AMD EPYC 9684X wins in all multi-threaded scenarios. The data shows a 100% advantage in PassMark find prime numbers (2020 vs 1010), indicating strong integer processing. It wins data encryption by 113.5%, making it suitable for security and cryptographic workloads. The 216.1% physics advantage points to simulation and scientific computing. The 59.6% data compression win and 112.7% random string sorting win make it ideal for database and data analytics tasks. Its 30.4% lead in floating-point math (472174 vs 362070) covers engineering and financial modeling.

The Intel Xeon 678X wins only in single-threaded tasks. Its 23.1% PassMark single-thread advantage (3758 vs 2891) makes it the choice for legacy applications, scripted workloads, or software that cannot utilize multiple cores effectively. The higher 4.90 GHz boost clock provides snappy response in latency-sensitive operations. Its 300 TDP and 48-core count also indicate a lower power and cooling footprint than the EPYC's 400 TDP, which may be relevant for dense deployments.

Specification Differences

The two processors differ on several key specification fields. The AMD EPYC 9684X uses the Zen 4 architecture with a Genoa-X codename, while the Intel Xeon 678X uses Granite Rapids. Both use a 5 nm process, but the EPYC's foundry is TSMC while the Xeon's is Intel. The EPYC has 96 cores and 192 threads; the Xeon has 48 cores and 96 threads. The EPYC has a 2.55 GHz base clock and 3.70 GHz boost; the Xeon has a 2.40 GHz base and 4.90 GHz boost. The EPYC's TDP is 400 watts, the Xeon's is 300 watts.

Cache sizes differ significantly: the EPYC has 64 KB L1 per core and 1 MB L2 per core with 1152 MB L3 shared; the Xeon has 112 KB L1 per core and 2 MB L2 per core with 192 MB L3 shared. The socket types are AMD Socket SP5 for the EPYC and Intel Socket 4710 for the Xeon. Memory support is DDR5 for both, but the EPYC uses twelve channels with 460.8 GB/s bandwidth, while the Xeon uses eight channels with 409.6 GB/s. Both support ECC memory and PCIe Gen 5 with 128 lanes. The EPYC has no integrated graphics; the Xeon lists N/A for integrated graphics. The EPYC's multiplier is locked, while the Xeon's is unlocked. The release dates are 2023-06-12 for the EPYC and 2026-02-01 for the Xeon. The EPYC's launch MSRP is $14756, and the Xeon's launch MSRP is $3749.