AMD EPYC 7663 vs AMD EPYC 7763 Comparison

Both the AMD EPYC 7763 and AMD EPYC 7663 are members of the same EPYC 7003 series, built on the Zen 3 Milan architecture, and share the same socket, memory support, and PCIe configuration. The EPYC 7763 is the higher-binned part with 64 cores and a 280W TDP, while the EPYC 7663 offers 56 cores at a 240W TDP, and the benchmark data shows a clear, though not uniform, performance hierarchy between them.

Head-to-Head Benchmarks

The most decisive victories for the EPYC 7763 come in workloads that scale heavily with core count and raw compute throughput. In PassMark's extended instructions test, the EPYC 7763 posts a score of 98,294 against 73,719 for the EPYC 7663, a massive 33.3% advantage. This is the single largest delta in the entire comparison and highlights a significant difference in vectorized or specialized instruction processing. Floating-point math also favors the 7763 substantially, with scores of 287,919 versus 251,535, a 14.5% lead. Integer math follows a similar pattern, with the 7763 scoring 516,920 compared to 468,096, a 10.4% advantage. These results indicate that for any heavy computational lifting, the 7763's additional cores translate directly into proportionally higher throughput.

The gap narrows considerably in more memory-bound or latency-sensitive tasks. In PassMark's data compression test, the 7763 wins with 1,628,973 against 1,447,020, a 12.6% margin that still favors the larger chip but is less pronounced than the pure math tests. Data encryption also shows a solid win for the 7763, scoring 121,001 versus 111,725, an 8.3% improvement. The Cinebench suite, which is a stalwart for rendering and multi-threaded CPU performance, tells a consistent story. Across R15, R20, and R23, the multicore scores for the 7763 are 7,247, 30,198, and 71,902 respectively, while the 7663 trails at 7,032, 29,304, and 69,773. Each of these multicore results represents a 3.1% advantage for the 7763. Single-core Cinebench scores are nearly identical, with the 7763 leading by 3.1% in R15 (1,023 vs 992) and 3% in both R20 (4,263 vs 4,137) and R23 (10,150 vs 9,850).

However, the EPYC 7663 is not without its own wins. In PassMark's single-thread test, the 7663 scores 2,606, which is 3.4% higher than the 7763's 2,518. This is an interesting reversal, suggesting that the 7663's slightly lower core count allows for marginally better per-core performance in this specific workload. The 7663 also wins in the physics test, scoring 8,020 against 7,708, a 3.9% margin. It also edges out the 7763 in random string sorting, with scores of 184,367 versus 182,676, a slim 0.9% lead. Finally, in the find prime numbers test, the 7663 scores 676 against 668, a 1.2% advantage. These wins, while fewer in number, demonstrate that the 7663 is not universally slower and can outperform its larger sibling in specific single-threaded or latency-sensitive scenarios. Overall, the EPYC 7763 wins 12 of the 17 head-to-head benchmarks, with the EPYC 7663 taking the remaining 5.

The Verdict

The data points to a straightforward choice for most buyers. The AMD EPYC 7763 is the superior processor for heavily threaded workloads. Its 3.1% lead across all Cinebench multicore tests and its commanding 14.5% and 10.4% wins in floating-point and integer math, respectively, make it the clear pick for rendering, scientific computing, and any application that can saturate 64 cores. The 33.3% advantage in extended instructions further cements its position for code that leverages advanced SIMD operations. The 7763 also holds an 8.3% edge in encryption, which is crucial for server workloads involving secure data handling.

The AMD EPYC 7663 is the better choice for workloads that prioritize single-threaded performance and latency. Its 3.4% lead in PassMark single-thread and 3.9% win in physics are modest but real advantages. The 7663 also wins in random string sorting, often a proxy for memory access patterns and cache efficiency. If your primary applications are lightly threaded or if you are sensitive to per-core clock behavior, the 7663 is the more sensible pick. The 3.1% delta in Cinebench multicore is small enough that in real-world rendering tasks, the difference may be within run-to-run variance, while the single-thread wins could be noticeable in daily responsiveness.

The overall average benchmark scores reflect this split. The 7763 has an average benchmark score of 179,916, placing it in the 98th percentile of all CPUs. Its nearest rival, the AMD Ryzen Threadripper PRO 9975WX, is only 1.5% ahead, while the Intel Xeon 6740P is 2.1% behind. The 7663, also in the 98th percentile, has an average score of 161,973. Its closest competitor is the AMD EPYC 9375F, which is 0.3% behind, and it sits 1% ahead of the AMD EPYC 9355P. This places the 7763 in a higher absolute performance tier, aligning with its higher core count and TDP.

Architecture Differences

Both processors are built on the same foundational architecture. They share the Zen 3 microarchitecture, codenamed Milan, and are fabricated on TSMC's 7 nm process node. Both have the same transistor count of 33,200 million and an identical die size of 8x 81 mm². The L1 cache is 64 KB per core, L2 is 512 KB per core, and L3 is a massive 256 MB shared pool. The only architectural difference is the core count itself: the 7763 has 64 cores and 128 threads, while the 7663 has 56 cores and 112 threads. This difference is a result of binning, where the 7763 has all its enabled chiplets fully populated and validated, while the 7663 has one or more chiplets with a portion of their cores disabled. This means the 7663's 8-core chiplets are running with reduced active cores, potentially allowing for slightly higher boost clocks on the active cores due to lower power draw per die.

Specification Differences

The two processors differ in a small set of core specifications. The primary difference is core count, with the 7763 offering 64 cores to the 7663's 56, and threads of 128 versus 112. This is accompanied by a difference in base clock: the 7763 has a base clock of 2.45 GHz, while the 7663 has a lower base clock of 2000.00 MHz. Interestingly, both processors share the same maximum boost clock of 3.50 GHz. The TDP also differs, with the 7763 rated at 280W and the 7663 at 240W. The launch MSRP for the 7763 is $7890, while the 7663 launched at $6366. Both use the AMD Socket SP3 and support eight-channel DDR4 memory with 204.8 GB/s of bandwidth. They also both provide Gen 4 PCIe with 128 lanes. Both have part numbers that differ, and neither is multiplier-unlocked.

FAQ

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

A: The AMD EPYC 7763 is faster. In Cinebench R23 multicore, it scores 71,902 compared to the 7663's 69,773, a 3.1% advantage. This pattern holds across R15 and R20 multicore tests.

Q: Does the EPYC 7663 have any advantages over the 7763?

A: Yes, the 7663 wins in PassMark's single-thread test (2,606 vs 2,518, a 3.4% lead), the physics test (8,020 vs 7,708, a 3.9% lead), and random string sorting (184,367 vs 182,676, a 0.9% lead).

Q: Are they compatible with the same motherboards?

A: Yes, both processors use the AMD Socket SP3, so they are drop-in compatible with boards designed for that socket, assuming the BIOS supports EPYC 7003 series processors.

Q: Which CPU has more cores and threads?

A: The AMD EPYC 7763 has 64 cores and 128 threads, while the AMD EPYC 7663 has 56 cores and 112 threads.

Q: What is the difference in their base clock speeds?

A: The EPYC 7763 has a base clock of 2.45 GHz, while the EPYC 7663 has a base clock of 2000.00 MHz. Both have the same 3.50 GHz boost clock.

Q: How does the EPYC 7763 compare to its closest rival, the Ryzen Threadripper PRO 9975WX?

A: The EPYC 7763's average benchmark score is 179,916, which is 1.5% lower than the Threadripper PRO 9975WX's average score of 182,700. It is also 2.1% higher than the Intel Xeon 6740P.

Where Each One Wins

The AMD EPYC 7763 is the definitive winner for throughput-oriented tasks. It excels in data encryption, scoring 121,001 versus 111,725, making it the better choice for database encryption, secure communications, and VPN gateways. Its 33.3% lead in extended instructions is a clear signal for scientific simulation, financial modeling, and any workload using AVX-512 or similar instruction sets. For heavy integer math, such as database transaction processing or code compilation, the 10.4% lead in integer math (516,920 vs 468,096) makes it the stronger option. The 12.6% win in data compression makes it ideal for file servers and backup systems that handle large archives. In any scenario where you can keep 64 cores busy, the 7763 is the superior part.

The AMD EPYC 7663 is the better choice for workloads that are not fully parallel or that are sensitive to memory latency. Its 3.4% win in PassMark single-thread suggests better performance in lightly threaded applications like certain legacy software or single-threaded database queries. The 3.9% win in the physics simulation test is relevant for certain engineering and scientific applications that rely on rigid body dynamics. The 0.9% win in random string sorting indicates slightly better memory access efficiency, which can benefit sorting algorithms and certain data processing pipelines. For a server running a mix of workloads with a significant single-threaded component, the 7663 offers a more balanced profile, and its lower 240W TDP is a practical advantage in dense deployments.