AMD EPYC 7663 vs AMD Ryzen 9 PRO 9965 Comparison

The AMD EPYC 7663 and AMD Ryzen 9 PRO 9965 are both active server/workstation processors from AMD, but they occupy opposite ends of the design spectrum. The EPYC 7663 is a 56-core, 112-thread Zen 3 part on the SP3 platform, while the Ryzen 9 PRO 9965 is a 16-core, 32-thread Zen 5 part on the AM5 platform. Benchmark data shows the EPYC 7663 wins 9 of 11 head-to-head tests, while the Ryzen 9 PRO 9965 takes the two single-thread tests. The EPYC 7663 achieves an average benchmark score of 161,973, placing it in the 98th percentile, whereas the Ryzen 9 PRO 9965 scores 145,728 on average, also in the 98th percentile. The EPYC 7663’s nearest rival is the AMD EPYC 9375F (deltaPct -0.3), while the Ryzen 9 PRO 9965’s closest competitor is the AMD EPYC 7643P (deltaPct 0.6).

Where Each One Wins

The data draws a clear line between these two processors: the EPYC 7663 dominates every multi-threaded and throughput-oriented workload, while the Ryzen 9 PRO 9965 wins exclusively on single-core performance. In the head-to-head results, the EPYC 7663 takes all nine multi-threaded tests, including data compression, encryption, integer math, floating-point math, and physics. Its largest margins come in data encryption (148.7% ahead) and physics (146.3% ahead), demonstrating a massive advantage in parallel compute tasks. The Ryzen 9 PRO 9965 wins both single-thread tests (passmark_single_thread and passmark_singlethread) with identical scores of 4682 versus 2606, a 44.3% lead.

For workloads that scale with core count, the EPYC 7663’s 56 cores and 112 threads provide a decisive edge. Its passmark_multithread score of 82,087 is 23.2% higher than the Ryzen 9 PRO 9965’s 66,655. The EPYC 7663 also leads in integer math by 92.4% (468,096 vs 243,280) and random string sorting by 94.2% (184,367 vs 94,915). The Ryzen 9 PRO 9965, with its 5.50 GHz boost clock versus the EPYC 7663’s 3.50 GHz, is the clear choice for latency-sensitive, single-threaded applications. Its passmark_single_thread score of 4682 ranks it 79.7% higher than the EPYC 7663’s 2606 in that specific metric.

The average benchmark scores reinforce this split. The EPYC 7663’s 161,973 average is 11.1% higher than the Ryzen 9 PRO 9965’s 145,728, but the Ryzen 9 PRO 9965’s nearest rivals (EPYC 7643P at 144,824, EPYC 8434P at 146,881) show it competes well in its segment. The EPYC 7663, meanwhile, sits within 1% of the EPYC 9375F (162,497) and EPYC 9355P (160,358). The takeaway is simple: choose the EPYC 7663 for server-scale parallel work, and the Ryzen 9 PRO 9965 for single-thread responsiveness.

FAQ

Q: Which processor has a higher multi-core benchmark score?

A: The AMD EPYC 7663 wins the passmark_multithread test with a score of 82,087, which is 23.2% higher than the Ryzen 9 PRO 9965’s 66,655.

Q: How large is the single-thread performance gap?

A: The Ryzen 9 PRO 9965 leads in passmark_single_thread with 4,682 points versus the EPYC 7663’s 2,606, a 44.3% advantage.

Q: Which CPU is better for data compression workloads?

A: The EPYC 7663 scores 1,447,020 in passmark_data_compression, which is 59.3% higher than the Ryzen 9 PRO 9965’s 908,293.

Q: What is the difference in memory bandwidth support?

A: The EPYC 7663 supports eight-channel DDR4 memory with 204.8 GB/s bandwidth, while the Ryzen 9 PRO 9965 supports dual-channel DDR5 with 89.6 GB/s.

Q: Do both processors support ECC memory?

A: Yes, both the EPYC 7663 and the Ryzen 9 PRO 9965 have ECC memory support enabled.

Q: How do the average benchmark scores compare?

A: The EPYC 7663 has an average benchmark score of 161,973, which is 11.1% higher than the Ryzen 9 PRO 9965’s 145,728.

Head-to-Head Benchmarks

The head-to-head results show a lopsided contest in favor of the EPYC 7663, with only two wins for the Ryzen 9 PRO 9965. The largest victory for the EPYC 7663 is in passmark_data_encryption, where it scores 111,725 against 44,920, a delta of 148.7%. This is followed closely by passmark_physics, where the EPYC 7663’s 8,020 beats 3,256 by 146.3%. The EPYC 7663 also wins passmark_integer_math by 92.4% (468,096 vs 243,280) and passmark_random_string_sorting by 94.2% (184,367 vs 94,915). These four tests show the EPYC 7663 more than doubling the Ryzen 9 PRO 9965’s output in encryption and physics, and nearly doubling it in integer operations.

The EPYC 7663’s lead narrows in some tests but remains substantial. In passmark_data_compression, it scores 1,447,020 versus 908,293, a 59.3% advantage. Passmark_floating_point_math shows 251,535 versus 160,746, a 56.5% lead. Passmark_find_prime_numbers yields 676 versus 364, an 85.7% margin. Even the closest multi-threaded win, passmark_extended_instructions, goes to the EPYC 7663 with 73,719 versus 71,210, a modest 3.5% edge. The passmark_multithread score of 82,087 versus 66,655 represents a 23.2% win.

The Ryzen 9 PRO 9965’s two wins are identical in score and deltaPct: passmark_single_thread and passmark_singlethread both show 4,682 versus 2,606, with a -44.3% deltaPct (meaning the EPYC 7663 is 44.3% behind). This is the only category where the Ryzen 9 PRO 9965 demonstrates clear superiority. The data shows that for any workload that can utilize more than a few cores, the EPYC 7663 provides a significant performance advantage—often double or more—while the Ryzen 9 PRO 9965’s strength is strictly in single-threaded tasks.

Specification Differences

The two processors differ across nearly every major specification. The EPYC 7663 has 56 cores and 112 threads, while the Ryzen 9 PRO 9965 has 16 cores and 32 threads. Base clocks are 2000.00 MHz for the EPYC 7663 and 4300.00 MHz for the Ryzen 9 PRO 9965, with boost clocks of 3.50 GHz and 5.50 GHz respectively. Thermal design power (TDP) is 240 W for the EPYC 7663 and 170 W for the Ryzen 9 PRO 9965. The EPYC 7663 uses AMD Socket SP3, while the Ryzen 9 PRO 9965 uses AMD Socket AM5.

Memory support differs fundamentally: the EPYC 7663 uses DDR4 with an eight-channel memory bus and 204.8 GB/s bandwidth, whereas the Ryzen 9 PRO 9965 uses DDR5 with a dual-channel bus and 89.6 GB/s bandwidth. PCIe support also diverges, with the EPYC 7663 offering Gen 4 with 128 lanes (CPU only) and the Ryzen 9 PRO 9965 offering Gen 5 with 24 lanes (CPU only). The EPYC 7663 has no integrated graphics, while the Ryzen 9 PRO 9965 includes Radeon Graphics. The EPYC 7663 has a launch MSRP of $6366, while the Ryzen 9 PRO 9965 has no launch MSRP listed.

Cache configurations differ significantly. The EPYC 7663 has 64 KB L1 per core, 512 KB L2 per core, and 256 MB shared L3. The Ryzen 9 PRO 9965 has 80 KB L1 per core, 1 MB L2 per core, and 64 MB shared L3. The EPYC 7663’s L3 cache is four times larger at the shared level, while the Ryzen 9 PRO 9965 has larger per-core L1 and L2 caches. The EPYC 7663 has a transistor count of 33,200 million across 8x 81 mm² dies, while the Ryzen 9 PRO 9965 has 16,630 million transistors across 2x 70.6 mm² dies.

Architecture Differences

The EPYC 7663 is built on the Zen 3 architecture (codename Milan) using a 7 nm process at TSMC, while the Ryzen 9 PRO 9965 uses the Zen 5 architecture (codename Granite Ridge) on a 4 nm process, also at TSMC. The EPYC 7663 belongs to the EPYC 7003 series and the Zen 3 (Milan) generation, whereas the Ryzen 9 PRO 9965 belongs to the 9000 series and the Ryzen 9 (Zen 5 Granite Ridge) generation. The process node difference—7 nm versus 4 nm—explains part of the performance per watt gap, though the EPYC 7663’s higher TDP (240 W vs 170 W) reflects its larger core count.

The die configuration differs: the EPYC 7663 uses 8x 81 mm² dies totaling 33,200 million transistors, while the Ryzen 9 PRO 9965 uses 2x 70.6 mm² dies with 16,630 million transistors. The EPYC 7663’s 256 MB shared L3 cache is four times the Ryzen 9 PRO 9965’s 64 MB L3, which is crucial for large working sets in server workloads. The Ryzen 9 PRO 9965 compensates with higher per-core L1 (80 KB vs 64 KB) and L2 (1 MB vs 512 KB) caches, alongside its much higher clock speeds.

Memory architecture is another key divergence: the EPYC 7663’s eight-channel DDR4 support provides 204.8 GB/s bandwidth, over double the Ryzen 9 PRO 9965’s dual-channel DDR5 at 89.6 GB/s. PCIe generations also differ, with the EPYC 7663 on Gen 4 (128 lanes) and the Ryzen 9 PRO 9965 on Gen 5 (24 lanes). The integrated graphics on the Ryzen 9 PRO 9965 is a feature absent from the EPYC 7663, which relies on discrete GPUs. These architectural choices reflect the EPYC 7663’s server focus on core count and memory throughput, versus the Ryzen 9 PRO 9965’s workstation focus on clock speed and modern I/O.

The Verdict

The benchmark data provides an unambiguous recommendation based on workload type. For multi-threaded server workloads, the AMD EPYC 7663 is the superior choice. It wins 9 of 11 head-to-head tests, with leads exceeding 90% in integer math, random string sorting, and data encryption. Its 56 cores and 112 threads, combined with 256 MB of L3 cache and 204.8 GB/s memory bandwidth, make it ideal for virtualization, database workloads, and scientific computing. The data shows it is 23.2% ahead in multithread performance and 56.5% ahead in floating-point math, making it the clear pick for any parallel compute task.

For single-threaded and latency-sensitive applications, the AMD Ryzen 9 PRO 9965 is the better option. Its passmark_single_thread score of 4,682 is 44.3% higher than the EPYC 7663’s 2,606, and its 5.50 GHz boost clock is 2.0 GHz higher. The Ryzen 9 PRO 9965 also offers modern features like DDR5 memory, PCIe Gen 5, and integrated graphics, which the EPYC 7663 lacks. However, its dual-channel memory bus (89.6 GB/s) and 16-core limit mean it cannot match the EPYC 7663’s throughput in any multi-threaded benchmark.

The average benchmark scores summarize the tradeoff: the EPYC 7663’s 161,973 average is 11.1% higher than the Ryzen 9 PRO 9965’s 145,728, but both sit in the 98th percentile of all CPUs. The EPYC 7663’s nearest rivals (EPYC 9375F at -0.3%, EPYC 9355P at 1%) show it is competitive with current server parts, while the Ryzen 9 PRO 9965’s rivals (EPYC 7643P at 0.6%, Threadripper PRO 9965WX at -0.9%) indicate it holds its own in the workstation segment. Ultimately, the EPYC 7663 is the data-driven choice for scale-out compute, while the Ryzen 9 PRO 9965 is the choice for single-thread performance and modern platform features.