AMD EPYC 8534P vs AMD EPYC 9684X Comparison

Head-to-Head Benchmarks

The benchmark data is unambiguous: the AMD EPYC 9684X wins all 17 recorded head-to-head tests against the AMD EPYC 8534P. The most dramatic gap appears in passmark_find_prime_numbers, where the 9684X scores 2020 versus 278 for the 8534P, a delta of 626.6%. The 9684X also dominates passmark_physics with a 573.2% advantage, scoring 24686 compared to 3667. These two workloads highlight the extreme difference in raw computational throughput when both processors are pushed to their limits.

The Cinebench suite shows a consistent pattern. Across R15, R20, and R23, the multicore deltas hover at exactly 69.1% in favor of the 9684X. The R23 multicore result is 103355 for the 9684X versus 61115 for the 8534P. Single-core Cinebench results follow the same trend, with a 69.2% delta in R15 (1470 vs 869) and 69.1% in both R20 (6128 vs 3623) and R23 (14591 vs 8628). This uniformity suggests the performance gap is structural, not workload-specific.

Passmark results tell a similar story but with more variance. The smallest win for the 9684X is in single-thread tests, where it scores 2891 versus 2441, an 18.4% advantage. This is notable because it shows the 9684X still leads even when only one core is active, meaning its advantage is not purely a core-count effect. The data compression test shows a 50.6% delta (2698807 vs 1791742), data encryption a 46.6% delta (178453 vs 121728), and extended instructions a 57.7% delta (177956 vs 112860). The floating point math test shows a 63.1% lead (472174 vs 289443), and integer math shows a 64.1% lead (844145 vs 514526). Random string sorting shows a 169.6% delta (349126 vs 129479), and multithread shows a 69.1% delta (121595 vs 71900).

For context, the 9684X sits at the 99th percentile of all CPUs in the database, with an average benchmark score of 266914. Its nearest rivals include the AMD Ryzen Threadripper 9970X at -4.6%, the Intel Xeon 6780E at -4.8%, the Intel Xeon 6980P at +6.1%, and the AMD EPYC 9565 at -6.5%. The 8534P sits at the 98th percentile with an average score of 185092, and its nearest rivals include the AMD Ryzen Threadripper PRO 9975WX at +1.3%, the Intel Xeon 6740E at -1.4%, the AMD EPYC 7763 at +2.9%, and the Intel Xeon 678X at -4.3%. The 9684X's average score is roughly 44% higher than the 8534P's, which aligns with the head-to-head deltas.

FAQ

Q: Which processor is faster in every recorded benchmark?

A: The AMD EPYC 9684X wins all 17 head-to-head tests. The largest margin is 626.6% in passmark_find_prime_numbers, and the smallest is 18.4% in passmark_single_thread.

Q: How does the single-core performance compare?

A: The 9684X leads by 18.4% in passmark single-thread tests (2891 vs 2441) and by 69.1% to 69.2% across the Cinebench R15, R20, and R23 single-core tests.

Q: Is the performance gap consistent across all workloads?

A: No. Cinebench multicore and single-core deltas are tightly clustered around 69.1%. Passmark deltas range from 18.4% to 626.6%, indicating the 9684X's advantage scales differently depending on the workload type.

Q: What is the average benchmark score difference?

A: The 9684X has an average benchmark score of 266914, while the 8534P has 185092. The 9684X's nearest rival, the AMD Ryzen Threadripper 9970X, is 4.6% behind, while the 8534P's nearest rival, the AMD Ryzen Threadripper PRO 9975WX, is 1.3% ahead.

Q: Do both processors support ECC memory?

A: Yes, both the 9684X and the 8534P support ECC memory.

Q: What are the release dates?

A: The 9684X was released on 2023-06-12, and the 8534P was released on 2023-09-17.

Architecture Differences

The two processors come from different EPYC families. The 9684X is part of the EPYC 9004 series, using the Zen 4 architecture under the Genoa-X codename. The 8534P is from the EPYC 8004 series, using the Zen 4c architecture under the Siena codename. Both are built on TSMC's 5 nm process node, but the transistor counts differ substantially: the 9684X has 135,240 million transistors across a die size of 12x 72 mm², while the 8534P has 35,500 million transistors across a die size of 4x 73 mm².

Core and cache configurations are major differentiators. The 9684X has 96 cores and 192 threads, with 64 KB of L1 cache per core, 1 MB of L2 cache per core, and a massive 1152 MB of shared L3 cache. The 8534P has 64 cores and 128 threads, with the same 64 KB L1 and 1 MB L2 per core, but only 128 MB of shared L3 cache. This nine-fold difference in L3 cache capacity is a defining architectural trait.

Memory and I/O also diverge. The 9684X uses a twelve-channel memory bus with 460.8 GB/s of bandwidth, while the 8534P uses a six-channel bus with 230.4 GB/s. Both support DDR5. PCIe connectivity differs as well: the 9684X provides 128 Gen 5 lanes (CPU only), while the 8534P provides 96 Gen 5 lanes. The sockets are different, with the 9684X on AMD Socket SP5 and the 8534P on AMD Socket SP6.

Clock speeds favor the 9684X. Its base clock is 2.55 GHz with a boost of 3.70 GHz, compared to the 8534P's 2.30 GHz base and 3.10 GHz boost. The 9684X has a TDP of 400, while the 8534P has a TDP of 200. Neither processor has integrated graphics, both are unlocked multipliers set to false, and both are in the Server/Workstation market segment with Active production status.

The Verdict

The data points to a clear split by workload class. If the priority is maximum multi-threaded throughput, cache-heavy workloads, or any compute task that scales with core count, the EPYC 9684X is the definitive choice. Its 69.1% lead across all Cinebench multicore tests and its 626.6% win in prime number finding show it excels in both general rendering and specialized math. The 9684X also holds a single-thread advantage of 18.4% in Passmark, so it does not sacrifice single-core responsiveness for its multi-core dominance.

The EPYC 8534P is not a failure by any reasonable measure. It sits at the 98th percentile of all CPUs, and its nearest rival, the AMD Ryzen Threadripper PRO 9975WX, is only 1.3% ahead. It competes well against the Intel Xeon 6740E (1.4% behind) and the AMD EPYC 7763 (2.9% ahead). The 8534P's 64 cores and 128 threads are still substantial, and its six-channel memory bus with 230.4 GB/s bandwidth is capable. The choice comes down to whether the workload justifies the 9684X's higher core count, larger cache, and faster clocks.

The 9684X's 99th percentile ranking and average score of 266914 versus the 8534P's 185092 means the performance tier is different. The 9684X is positioned against processors like the Intel Xeon 6980P (6.1% behind) and the AMD EPYC 9565 (6.5% behind). The 8534P sits in a lower tier where the competition is much closer. For a system that needs every bit of compute density, the 9684X is the answer. For a more balanced deployment where the 8534P's lower TDP and smaller footprint are acceptable, the 8534P is a rational choice, but it will trail the 9684X in every recorded metric.

Specification Differences

The key specification deltas are as follows. The 9684X has 96 cores and 192 threads versus 64 cores and 128 threads for the 8534P. Base clock is 2.55 GHz versus 2.30 GHz, and boost clock is 3.70 GHz versus 3.10 GHz. TDP is 400 versus 200. The socket differs: SP5 for the 9684X, SP6 for the 8534P. Architecture is Zen 4 (Genoa-X) versus Zen 4c (Siena). Transistor count is 135,240 million versus 35,500 million. Die size is 12x 72 mm² versus 4x 73 mm². L3 cache is 1152 MB versus 128 MB. Memory bus is twelve-channel versus six-channel, with bandwidth of 460.8 GB/s versus 230.4 GB/s. PCIe lanes are 128 versus 96, both Gen 5. The release date is 2023-06-12 versus 2023-09-17. The launch MSRP for the 9684X is $14756, and for the 8534P it is $4950. Both have the same L1 and L2 per core, both support DDR5 and ECC, and both have no integrated graphics.

Where Each One Wins

The EPYC 9684X wins everywhere in the recorded data. The largest margins are in prime number finding (626.6%), physics (573.2%), and random string sorting (169.6%). These are compute-intensive, cache-sensitive workloads where the 9684X's 1152 MB L3 cache and higher core count provide a massive advantage. The 9684X also wins heavily in integer math (64.1%), floating point math (63.1%), extended instructions (57.7%), and data compression (50.6%). It wins encryption by 46.6% and multithread by 69.1%. Even in the single-thread tests, the 9684X leads by 18.4%.

The EPYC 8534P has no benchmark wins, but its profile is not without merit. Its 200 TDP versus the 9684X's 400 suggests a much lower power envelope, which can be an operational advantage in dense server deployments where cooling and power delivery are constrained. Its six-channel memory bus and 96 PCIe lanes are still sufficient for many server workloads. The 8534P's nearest rival data shows it performs close to the AMD Ryzen Threadripper PRO 9975WX and the AMD EPYC 7763, meaning it is competitive within its own tier.

For use-case planning: choose the 9684X for HPC, rendering, scientific computing, database workloads that rely on large caches, or any scenario where the 17-0 head-to-head sweep matters. Choose the 8534P only if the workload can tolerate a 64-core, 128-thread processor with less L3 cache and lower memory bandwidth, and if the power envelope is a binding constraint. The data does not show any workload where the 8534P outperforms the 9684X, so the decision rests on system-level factors like power, socket compatibility, and cost boundaries that are outside the benchmark results.