Intel Xeon 6520P vs Intel Xeon 6736P Comparison

Head-to-Head Benchmarks

The benchmark comparison between the Intel Xeon 6520P and the Intel Xeon 6736P is decisively lopsided. The 6520P wins 15 of the 17 recorded head-to-head tests, leaving the 6736P with only two victories. The margin of victory in the Cinebench suite is remarkably consistent: across all six tests (R15, R20, and R23, both multi-core and single-core), the 6520P leads by exactly 25.7% or 25.8%. That uniformity points to a fundamental per-core performance advantage rather than workload-specific tuning.

The single-thread gap is the most dramatic number in the entire comparison. In PassMark's single-thread test, the 6520P scores 3356 against 2024 for the 6736P, a delta of 65.8%. That is not a small edge; it is a generational-class difference in how each chip executes lightly threaded work. The same story appears in Cinebench single-core runs, where the 6520P's 761 (R15), 3171 (R20), and 7552 (R23) dwarf the 6736P's 605, 2523, and 6008 respectively.

Multi-threaded workloads tell a similar tale. In Cinebench R23 multi-core, the 6520P posts 53495 versus 42561 for the 6736P, a 25.7% advantage. PassMark multi-thread mirrors this with 62936 against 50072, again 25.7% ahead. The 6520P also leads in prime number finding by 34.2% (526 vs 392), in extended instructions by 16.2% (64557 vs 55563), in physics by 10.4% (7209 vs 6531), and in floating-point math by 8.7% (162862 vs 149770). Integer math is closer at 3.6% (214288 vs 206833), and data compression sees a 5.6% edge (841518 vs 796658).

The 6736P's two wins are narrow but real. In data encryption, it scores 46236 against 45188, a 2.3% advantage. In random string sorting, it posts 103723 versus 95736, a 7.7% lead. Those are the only places where the higher core count of the 6736P translates into a measurable win, and even then the margins are modest compared to the scale of the 6520P's victories elsewhere.

The average benchmark scores reflect the overall picture: the 6520P averages 93786 across all tests, while the 6736P averages 87864, a difference of roughly 6.7%. Both sit at the 96th percentile among all CPUs in the database, so neither is a slouch, but the 6520P is clearly the stronger performer in the majority of recorded workloads.

FAQ

Q: Which CPU wins more head-to-head benchmarks?

A: The Intel Xeon 6520P wins 15 of the 17 recorded comparisons. The Intel Xeon 6736P wins only 2: data encryption and random string sorting.

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

A: In PassMark's single-thread test, the 6520P scores 3356 against 2024 for the 6736P, a 65.8% advantage. Cinebench single-core tests show a similar pattern, with the 6520P leading by 25.7% to 25.8% across R15, R20, and R23.

Q: Does the 6736P's higher core count help in any benchmark?

A: Yes, but only marginally. The 6736P has 36 cores versus 24 for the 6520P, yet it wins only in data encryption (46236 vs 45188, a 2.3% edge) and random string sorting (103723 vs 95736, a 7.7% edge). In every other multi-threaded test, the 6520P wins despite having fewer cores.

Q: Are the Cinebench multi-core results consistent across versions?

A: Very much so. The 6520P leads by 25.7% in Cinebench R15 multi-core (5392 vs 4290), R20 multi-core (22467 vs 17875), and R23 multi-core (53495 vs 42561). The consistency suggests a stable architectural advantage rather than a workload-specific quirk.

Q: What is the average benchmark score for each CPU?

A: The 6520P has an average benchmark score of 93786, while the 6736P averages 87864. Both rank in the 96th percentile of all CPUs in the database.

Q: How do these CPUs compare to their nearest rivals?

A: The 6520P is essentially tied with the Intel Core Ultra 7 270K Plus (delta 0%), slightly behind the AMD EPYC 4564P by 1.5%, and behind the AMD EPYC 9175F by 1.9% and the AMD EPYC 4565P by 2.1%. The 6736P is 0.1% ahead of the Intel Xeon 6731P, 0.3% behind the Intel Xeon w7-2575X, 3% behind the AMD Ryzen AI Max+ 392, and 3.3% ahead of the AMD EPYC 7F72.

Where Each One Wins

The 6520P is the clear choice for compute-heavy, latency-sensitive, and lightly threaded workloads. Its 65.8% lead in PassMark single-thread and 25.7% edge in every Cinebench single-core test means that any application relying on per-core speed, such as database queries, scripting, or interactive workloads, will favor it. The 34.2% advantage in prime number finding and 16.2% lead in extended instructions further solidify its position for scientific computing and cryptography-adjacent tasks. The 25.7% margins in multi-core Cinebench and PassMark multi-thread also make it the better pick for general parallel rendering, compilation, and simulation work, despite having 12 fewer cores than the 6736P.

The 6736P's wins are narrow and specialized. Data encryption (2.3% ahead) and random string sorting (7.7% ahead) are the only tests where it comes out on top. This suggests that its 36 cores can provide an advantage in workloads that are highly parallel but also memory-latency tolerant, where the extra cores can be fed without being bottlenecked by per-thread performance. For encryption-heavy server workloads or large-scale sorting operations, the 6736P is not without merit, but the margins are small.

For every other scenario, the data points to the 6520P. The 8.7% lead in floating-point math and 10.4% lead in physics make it better for engineering simulations and physics calculations. The 3.6% edge in integer math is modest but still a win. Data compression, where the 6520P leads by 5.6%, is another area where it outperforms despite the core-count disadvantage.

Specification Differences

The two processors share the same base architecture, socket, and memory capabilities, but their core configurations and clock speeds differ significantly.

The 6520P has 24 cores and 48 threads, while the 6736P has 36 cores and 72 threads. That is a 50% increase in core count for the 6736P, but the 6520P compensates with higher clocks. The 6520P runs at a 2.40 GHz base clock and boosts to 4.00 GHz. The 6736P has a 2.00 GHz base clock and boosts to 4.10 GHz. So the 6520P has a 0.40 GHz base clock advantage, while the 6736P has a 0.10 GHz boost clock advantage.

Thermal design power differs slightly: the 6520P is rated at 210 W, the 6736P at 205 W. Both use the same Intel Socket 4710. Cache configurations are identical: 112 KB L1 per core, 2 MB L2 per core, and 144 MB shared L3. Memory support is also the same: DDR5 with an eight-channel bus and 409.6 GB/s bandwidth, with ECC support. PCIe is Gen 5 with 88 lanes (CPU only) for both.

The launch MSRP differs substantially: the 6520P launched at $1295, while the 6736P launched at $3351. The part numbers are SRVNQ for the 6520P and SRVNW for the 6736P. Both are active production parts, released on the same date, with no integrated graphics and no unlocked multiplier.

Architecture Differences

Both processors are built on Intel's Granite Rapids architecture, part of the Xeon 6 (Granite Rapids-SP) generation. They share the same 5 nm process node, the same foundry (Intel), and the same die size of 598 mm². The cache hierarchy is identical across both chips: 112 KB L1 per core, 2 MB L2 per core, and 144 MB shared L3. Both have eight-channel DDR5 memory support with 409.6 GB/s bandwidth, and both offer Gen 5 PCIe with 88 lanes.

The core count difference is the primary architectural differentiator. The 6736P packs 36 cores into the same die and socket as the 6520P's 24 cores, which explains its lower base clock (2.00 GHz vs 2.40 GHz) and slightly higher boost clock (4.10 GHz vs 4.00 GHz). The 6736P's higher boost clock suggests that when only a few cores are active, it can push slightly faster than the 6520P, but its lower base clock and higher core count mean that all-core sustained workloads likely run at lower frequencies.

The 6520P's per-core performance advantage, as evidenced by the 65.8% single-thread lead, is not explained by clock speed alone. A 0.40 GHz base clock advantage (roughly 20%) does not account for a 65.8% score gap. This points to binning differences within the same architecture, where the 6520P's cores are capable of higher sustained performance per clock. The identical cache layout and process node rule out structural differences, leaving per-core quality as the likely factor.

Both chips support ECC memory and are designed for the server/workstation market segment. Neither has integrated graphics, and both are socketed for Intel Socket 4710, meaning they are drop-in compatible at the platform level if the motherboard supports both TDP classes.

The Verdict

The data is unambiguous: the Intel Xeon 6520P is the superior processor for the vast majority of workloads. It wins 15 of 17 benchmarks, including every Cinebench test, every PassMark math test, and the multi-threaded and single-threaded PassMark suites. Its average benchmark score of 93786 is higher than the 6736P's 87864, and it achieves this with 12 fewer cores and a lower core count. The 25.7% margins in multi-core Cinebench tests are particularly telling: the 6520P's 24 cores outperform the 6736P's 36 cores in heavily parallel rendering workloads, which means the 6520P's per-core efficiency more than compensates for the core-count deficit.

The 6736P is not without a role. Its wins in data encryption (2.3%) and random string sorting (7.7%) suggest that certain highly parallel, memory-latency-tolerant workloads can benefit from the extra 12 cores. For server deployments that are specifically encryption-heavy or that perform large-scale sorting operations, the 6736P offers a measurable, if narrow, advantage. Its higher boost clock of 4.10 GHz also gives it a slight edge in lightly threaded bursts, though the benchmark data does not reflect this in any single-thread test.

For anyone building a workstation or server where the workload mix is general-purpose, the 6520P is the clear pick. It delivers better single-thread performance by a wide margin, better multi-thread performance in most tests, and does so at a significantly lower launch MSRP. The 6736P's higher core count is a real asset only in a slim set of specialized tasks, and the price premium is substantial. The benchmark data consistently favors the 6520P, and the only reason to choose the 6736P is if the specific workload profile matches its two winning tests. Otherwise, the 6520P is the better-performing processor in nearly every measurable way.