Intel Xeon 6774P vs Intel Xeon 6781P Comparison

The Intel Xeon 6781P and Intel Xeon 6774P are two closely related Granite Rapids-SP server processors sharing the same socket, process node, and memory architecture, yet benchmark data reveals a distinct performance hierarchy between them. The 6781P claims victory in 13 of the 14 head-to-head benchmark comparisons, while the 6774P manages only a single win, painting a clear picture of which chip offers greater raw compute capability despite their shared foundation.

Head-to-Head Benchmarks

The most lopsided result in the entire comparison comes from the PassMark find prime numbers test, where the 6781P scores 1687 against the 6774P’s 1264. That is a 33.5% advantage, the largest delta of any benchmark in the dataset. This dramatic gap suggests the 6781P’s additional cores translate disproportionately well into integer-heavy prime computation workloads, a pattern not seen in other integer tests.

The extended instructions benchmark shows the second-biggest separation, with the 6781P posting 199048 versus 177273 for the 6774P, a 12.3% lead. This workload, which typically exercises SIMD and specialized instruction paths, rewards the 6781P’s higher core count more than clock speed alone would predict. Similarly, the physics benchmark gives the 6781P a 10.8% edge (17753 vs 16023), and floating point math comes in at 9% (507406 vs 465314).

Across the Cinebench suite, the pattern is remarkably consistent. The 6781P wins R15, R20, and R23 multicore tests by exactly 4.6% each time, with scores of 10105 vs 9660, 42106 vs 40251, and 100254 vs 95836 respectively. This uniform margin across all three Cinebench versions indicates that the performance difference scales linearly with the workload, neither amplifying nor diminishing as the rendering complexity grows.

The 6781P also takes data compression (2441690 vs 2309868, +5.7%), data encryption (119623 vs 115025, +4%), and multithread (117946 vs 112749, +4.6%). Even the single-thread tests, which typically favor higher clock speeds, go to the 6781P at 3152 vs 3047, a 3.4% advantage. Notably, the 6774P has a higher base clock (2.50 vs 2.00) and boost clock (3.90 vs 3.80), yet still loses in single-thread performance—a counterintuitive result that suggests the 6781P’s architecture or cache behavior compensates for its lower nominal clocks.

The single 6774P victory comes in integer math, where it scores 593440 against 584834, a 1.5% margin. This is the only benchmark where the 6781P’s core advantage fails to overcome the 6774P’s clock speed, and the margin is narrow enough to suggest workload-specific scheduling effects rather than a fundamental architectural superiority.

Where Each One Wins

The 6781P dominates in virtually every category, making it the default choice for compute-heavy server workloads. Its 33.5% lead in prime number finding positions it strongly for cryptography, scientific computing, and any workload involving modular arithmetic. The 12.3% extended instructions advantage points to HPC applications that leverage AVX-512 or similar vectorized instruction sets, while the 10.8% physics lead suggests simulation and game physics workloads will see meaningful gains.

Data-centric workloads favor the 6781P as well. Data compression at +5.7% and encryption at +4% indicate that database compression, data warehousing, and secure transaction processing all benefit from the higher core count. The 4.6% multithread margin across the board makes the 6781P the safer bet for general virtualization, container hosting, and parallel batch processing.

The 6774P’s single integer math win, while isolated, hints at a niche. At +1.5%, it is not a compelling reason to choose the chip, but for workloads that are purely integer-bound and latency-sensitive, the higher base clock of 2.50 may offer marginal gains. The 6774P also posts a 5% delta compared to the Intel Xeon 696X in its nearest rivals list, suggesting it outperforms that chip, but that comparison is secondary to the head-to-head with the 6781P.

Architecture Differences

Both processors share the same Granite Rapids architecture, codename Granite Rapids, and are built on Intel’s 5 nm process node with a die size of 2x 598 mm². They use the same Intel Socket 4710, belong to the Xeon 6 (Granite Rapids-SP) generation, and are fabricated by Intel. The cache hierarchy is identical: 112 KB L1 per core, 2 MB L2 per core, and 336 MB shared L3. Memory support matches at DDR5 with eight-channel bus and 409.6 GB/s bandwidth, and both support ECC memory.

The only architectural difference appears in core and thread counts. The 6781P has 80 cores and 160 threads, while the 6774P has 64 cores and 128 threads—a 25% core advantage for the 6781P. Yet the performance deltas are much smaller than 25% in most benchmarks, which indicates that the 6774P’s higher clock speeds partially compensate for fewer cores. The 6781P’s base clock of 2.00 GHz is 25% lower than the 6774P’s 2.50 GHz, and the boost clock is 3.80 vs 3.90, meaning the 6774P runs meaningfully faster per core. The result is that the 6781P’s extra cores deliver only a 4-12% performance uplift in most tests, not the full 25% core advantage.

Both chips have no integrated graphics, target the server/workstation market segment, have locked multipliers, and are listed as active production. Their release dates differ by about three months, with the 6781P launching 2025-02-23 and the 6774P on 2025-05-21, but this timing difference has no bearing on their architectural characteristics.

Specification Differences

The specification sheets show only a handful of fields where the two differ. Core count is the most obvious: 80 for the 6781P versus 64 for the 6774P. Thread count follows at 160 versus 128. Base clock differs at 2.00 GHz for the 6781P and 2.50 GHz for the 6774P, and boost clock differs at 3.80 versus 3.90 GHz. The part numbers are distinct (SRV5J for the 6781P, SRWPC for the 6774P), and the launch MSRP differs: $8960 for the 6781P and $6760 for the 6774P.

Everything else is identical. Both have a TDP of 350 watts, use PCIe Gen 5 with 136 lanes (CPU only), support DDR5 with eight channels and 409.6 GB/s bandwidth, and share the same cache sizes. The process node, foundry, die size, socket, architecture, codename, generation, memory bus, ECC support, integrated graphics (N/A for both), market segment, production status, and multiplier unlock status are all the same. The average benchmark score reflects the overall gap: 315524 for the 6781P versus 300372 for the 6774P, a 5% difference in aggregate performance.

FAQ

Q: Why does the 6781P win single-thread benchmarks despite having a lower boost clock than the 6774P?

A: The 6781P scores 3152 in PassMark single-thread versus 3047 for the 6774P, a 3.4% advantage, even though the 6774P has a 3.90 GHz boost clock versus 3.80 GHz. The data suggests that factors beyond raw clock speed—likely cache behavior or microarchitectural scheduling—give the 6781P an edge in single-threaded execution.

Q: How much performance does the 6781P gain from its extra 16 cores?

A: The 6781P has 80 cores versus 64 for the 6774P, a 25% increase. However, benchmark deltas range from 2.3% (random string sorting) to 33.5% (find prime numbers), with most tests falling between 4% and 12%. The core advantage is not uniform across workloads, and the 6774P’s higher clocks mitigate the gap significantly.

Q: Is there any workload where the 6774P is the better choice?

A: Yes, the PassMark integer math test is the only benchmark where the 6774P wins, scoring 593440 versus 584834 for the 6781P, a 1.5% margin. This indicates that purely integer-bound, single-threaded or lightly-threaded workloads may favor the 6774P due to its higher base and boost clocks.

Q: What is the average benchmark score difference between the two processors?

A: The 6781P has an average benchmark score of 315524, while the 6774P averages 300372. This represents a 5% overall performance advantage for the 6781P across all benchmarks combined.

Q: Do both processors share the same memory architecture?

A: Yes, both support DDR5 with an eight-channel memory bus and 409.6 GB/s bandwidth, and both have ECC memory support. There is no memory-related differentiation between them.

Q: How do these chips compare to their nearest rivals in the data?

A: The 6781P is 1.2% ahead of the AMD EPYC 9575F and 1.6% ahead of the AMD EPYC 9734, while trailing the AMD Ryzen Threadripper PRO 9985WX by 1.6% and the AMD Ryzen Threadripper 9980X by 1.9%. The 6774P trails the EPYC 9734 by 3.3% and the EPYC 9575F by 3.7%, but leads the AMD EPYC 9555P by 4.6% and the Intel Xeon 696X by 5%.

The Verdict

The data is unambiguous: the Intel Xeon 6781P is the superior processor in 13 of 14 benchmark comparisons, with an average score 5% higher than the 6774P. Anyone deploying for multi-threaded server workloads—rendering, data compression, encryption, scientific simulation, or virtualization—should choose the 6781P, as its core advantage translates into consistent wins across nearly every test category. The 33.5% lead in prime number finding and 12.3% lead in extended instructions make it particularly compelling for cryptography and HPC workloads.

The 6774P is only justifiable in a narrow scenario: integer math workloads where its 1.5% advantage could matter, and where the launch MSRP difference of $2200 (the 6781P costs $8960 versus $6760 for the 6774P) is a consideration. But given that the 6774P loses in every other benchmark, including single-thread tests where its higher clock should have helped, the 6781P is the safer and more capable choice for virtually all applications. The 6774P’s only real virtue is cost savings, but the performance data shows that saving money means sacrificing performance in nearly every measurable way.