Intel Xeon 6527P vs Intel Xeon 658X Comparison

The Intel Xeon 658X and Intel Xeon 6527P are both 24-core Granite Rapids parts on the same Intel Socket 4710, but the benchmark data reveals they are tuned for noticeably different workloads. The 658X pushes clock speed and single-thread performance, while the 6527P counters with superior multi-threaded endurance and specialized compute results. The overall average benchmark scores are nearly identical—116,060 for the 658X versus 115,190 for the 6527P, a 0.8% gap in favor of the 658X—yet the distribution of wins across individual tests tells a more complex story.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head results is the near-universal Cinebench sweep by the 6527P. Across all six Cinebench tests—R15, R20, and R23 in both single-core and multi-core variants—the 6527P wins every time by exactly 1.3%. This consistency suggests a fundamental advantage in how the 6527P sustains load, despite the 658X having a higher boost clock of 4.90 GHz versus 4.20 GHz. In Cinebench R23 multi-core, the 6527P scores 63,278 against the 658X's 62,466; in single-core R23, it is 8,933 versus 8,818. The 1.3% delta is small but uniform, pointing to thermal or power delivery characteristics rather than architectural differences.

The PassMark suite flips the script. The 658X wins six tests outright, including the largest margin of the entire comparison: a 27.8% lead in find prime numbers (649 versus 508). It also dominates extended instructions by 18.2% (84,626 versus 71,600) and floating point math by 7.9% (210,480 versus 195,005). Data compression goes to the 658X by 3% (1,062,062 versus 1,030,818), and single-thread performance shows a 5.3% lead (3,728 versus 3,539). These are not marginal wins; they indicate the 658X's higher boost clock translates directly into raw compute throughput for integer-heavy, encryption-light, and floating-point tasks.

The 6527P answers with significant wins in specialized workloads. Its most pronounced victory is in random string sorting, where it beats the 658X by 21.7% (131,597 versus 103,028). Physics simulation shows a 19.5% lead (8,037 versus 6,470), and data encryption comes in 13.2% ahead (60,333 versus 52,357). Integer math also favors the 6527P by 1.9% (268,985 versus 263,995), alongside a 1.3% win in the PassMark multi-thread test (74,445 versus 73,490). The 6527P captures 11 wins total against the 658X's 6, yet the overall average score remains within 1%—proof of how workload-specific these results are.

The Verdict

For a builder prioritizing single-thread responsiveness and broad floating-point or encryption-adjacent workloads, the Xeon 658X is the clear pick. Its 5.3% single-thread lead and 18.2% extended-instructions advantage are decisive for applications that cannot parallelize perfectly. The 27.8% find-prime-numbers margin also suggests strong integer math performance per core, which matters for certain scientific and financial simulations. The 658X also offers an unlocked multiplier, making it the only one of the pair that can be overclocked—a feature absent from the 6527P.

Conversely, the 6527P is the safer choice for heavily threaded, memory-latency-sensitive tasks. Its wins in physics (19.5%), random string sorting (21.7%), and data encryption (13.2%) indicate it handles pointer-chasing and memory-bound operations more efficiently. The uniform 1.3% lead across all Cinebench tests, including multi-core, suggests the 6527P sustains all-core turbo more effectively than the 658X, despite a lower peak boost. If your workload resembles rendering, physics simulation, or database string operations, the 6527P's specialized strengths justify its higher launch MSRP of $2878 versus $1699 for the 658X.

The data does not support a universal winner. The 658X is 0.8% faster by average benchmark score, but the 6527P wins twice as many individual tests. Choose based on your specific application mix, not the aggregate.

Architecture Differences

Both CPUs share the same Granite Rapids architecture, manufactured on Intel's 5 nm process, with identical core counts of 24 and 48 threads. The cache hierarchy is also the same: 112 KB of L1 per core, 2 MB of L2 per core, and 144 MB of shared L3. Memory support is identical—DDR5 over an eight-channel bus with 409.6 GB/s of bandwidth and ECC capability. The TDP is close: 250 W for the 658X versus 255 W for the 6527P, a negligible difference for cooling requirements.

The primary architectural divergence lies in the die implementation. The 658X uses a dual-die design with a total die size of 2x 598 mm², while the 6527P uses a single 598 mm² die. This explains why the 658X supports 128 PCIe Gen 5 lanes (CPU only) against the 6527P's 88 lanes—the second die provides additional I/O connectivity. The boost clocks differ meaningfully: 4.90 GHz for the 658X versus 4.20 GHz for the 6527P, with both having a 3.00 GHz base clock. The 658X's unlocked multiplier is a feature absent on the 6527P, which is locked.

The release dates differ by about a year: the 6527P launched on 2025-02-23, while the 658X came later on 2026-02-01. Both are in the Xeon 600 series, but the 658X belongs to the Granite Rapids-WS generation, whereas the 6527P is Granite Rapids-SP. The part numbers are SA2D2 for the 658X and SRVNY for the 6527P.

FAQ

Q: Which CPU has the higher boost clock?

A: The Intel Xeon 658X has a boost clock of 4.90 GHz, while the Intel Xeon 6527P is limited to 4.20 GHz. Both have a 3.00 GHz base clock.

Q: Are these CPUs the same physical size?

A: No. The 658X uses a dual-die configuration with a total die size of 2x 598 mm², while the 6527P uses a single die of 598 mm². This affects PCIe lane availability, not core performance.

Q: Which CPU supports more PCIe lanes?

A: The 658X supports 128 PCIe Gen 5 lanes (CPU only), whereas the 6527P supports 88 lanes. The extra lanes come from the 658X's second die.

Q: What is the memory bandwidth for both?

A: Both CPUs feature eight-channel DDR5 memory with identical 409.6 GB/s bandwidth. Memory support and ECC capability are exactly the same.

Q: Can I overclock either CPU?

A: The 658X has an unlocked multiplier, so it can be overclocked. The 6527P has a locked multiplier, meaning its clock speed is fixed by Intel.

Q: Which CPU has a higher launch MSRP?

A: The 6527P has a launch MSRP of $2878, while the 658X is priced at $1699. The lower-priced 658X also has the higher boost clock.

Where Each One Wins

The 658X wins in scenarios that favor raw single-thread throughput and high-frequency integer math. Its 5.3% single-thread lead over the 6527P makes it better suited for lightly threaded applications, database queries that depend on single-core latency, or any workflow where per-core performance trumps core count scaling. The 18.2% extended-instructions advantage and 7.9% floating-point lead point to scientific computing and simulation workloads that use AVX-512 or similar instruction sets. Data compression also favors the 658X by 3%, which helps in storage-heavy server roles. The unlocked multiplier gives it headroom for tuning, a rare feature in this segment.

The 6527P dominates in memory-bound and highly parallel tasks. Its 21.7% lead in random string sorting suggests it excels in text processing, log analysis, or any workload with unpredictable memory access patterns. The 19.5% physics advantage indicates strong performance in rigid-body or particle simulations, likely due to better sustained all-core clock behavior. Data encryption runs 13.2% faster on the 6527P, making it the better choice for secure communications or database encryption workloads. The uniform 1.3% win across all Cinebench multi-core tests reinforces that the 6527P is the more consistent performer under sustained multi-threaded load, even if its peak boost clock is lower. For integer math, the 6527P also edges ahead by 1.9%, which is a core server workload.

Specification Differences

The two CPUs differ in several key specifications. The 658X has a boost clock of 4.90 GHz versus 4.20 GHz on the 6527P, while both share a 3.00 GHz base clock. The 658X uses a dual-die design at 2x 598 mm², compared to the 6527P's single 598 mm² die. PCIe lane counts differ significantly: the 658X offers 128 Gen 5 lanes (CPU only), while the 6527P offers 88. The 658X is multiplier-unlocked; the 6527P is locked. TDPs are 250 W for the 658X and 255 W for the 6527P. The 658X belongs to the Granite Rapids-WS generation with part number SA2D2, released 2026-02-01, while the 6527P is Granite Rapids-SP with part number SRVNY, released 2025-02-23. Launch MSRP is $1699 for the 658X and $2878 for the 6527P. All other specifications—cores, threads, cache sizes, memory bus, bandwidth, ECC support, and integrated graphics (N/A for both)—are identical.