Intel Xeon 634 vs Intel Xeon 6505P Comparison

Both the Intel Xeon 6505P and the Intel Xeon 634 are 12-core, 24-thread Granite Rapids server processors on the same Intel Socket 4710 platform. They share the same 5 nm process node, identical per-core cache allocations, and a 150 W TDP. However, benchmark results reveal a clear split between multi-threaded throughput and single-thread performance. The Xeon 6505P wins 13 of the 17 head-to-head comparisons, including every Cinebench test, while the Xeon 634 counters with a significant 10.7% lead in PassMark's single-thread test and a smaller edge in floating-point math. Both chips sit at the 91st percentile among all CPUs, with average benchmark scores of 53701 for the 6505P and 52974 for the 634, a gap of roughly 1.4%.

Head-to-Head Benchmarks

The most decisive victory for the Xeon 6505P comes in PassMark's physics test, where it scores 2991 against the Xeon 634's 2250. That is a 32.9% advantage, the largest delta in the entire comparison. This suggests the 6505P's architecture handles the physics workload's instruction patterns far more efficiently, likely due to differences in memory subsystem configuration rather than core count, since both chips have identical core and thread counts.

In Cinebench rendering workloads, the 6505P is consistently 2.3% ahead across all three versions (R15, R20, R23) for both multi-core and single-core tests. For example, in Cinebench R23 multi-core, the 6505P scores 32687 versus 31950, while in single-core it scores 4614 versus 4510. This uniformity — every Cinebench delta is exactly 2.3% — points to a fixed architectural advantage that scales equally across all thread counts, likely stemming from the 6505P's eight-channel memory bus providing 409.6 GB/s of bandwidth versus the 634's quad-channel 204.8 GB/s.

The 6505P also dominates integer-heavy workloads. It leads by 2.4% in PassMark integer math (120456 vs 117664) and by 10.7% in the find prime numbers test (217 vs 196). The prime number test is notoriously sensitive to memory latency and cache thrashing, and the 6505P's superior bandwidth helps it outperform despite both chips sharing the same 48 MB L3 cache. Random string sorting shows an 11.4% gap (52372 vs 47016) in favor of the 6505P, further reinforcing its strength in data manipulation tasks.

Data encryption also favors the 6505P by 4.3% (24458 vs 23451), and data compression by a narrower 0.5% (480368 vs 477924). The multithread composite score for PassMark gives the 6505P a 2.3% edge (38456 vs 37589). Even the single-core Cinebench R20 result, where the 6505P scores 1937 versus 1894, confirms that the 6505P is not just a multi-threaded brute — it also holds a slight clock-for-clock efficiency advantage in these specific rendering tasks.

The Xeon 634 fights back in two notable areas. Its PassMark single-thread score of 3567 crushes the 6505P's 3187, a 10.7% lead that is the second-largest margin in the entire benchmark suite. This is a massive swing, suggesting the 634's higher boost clock of 4.60 GHz (versus 4.10 GHz) delivers real single-thread performance gains that outweigh the 6505P's memory bandwidth advantage in latency-sensitive workloads. The 634 also edges out the 6505P in PassMark floating-point math (93564 vs 92992, a 0.6% lead) and extended instructions (38320 vs 37515, a 2.1% lead), indicating its SIMD and vector processing capabilities are slightly stronger.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Xeon 6505P has an average benchmark score of 53701, while the Intel Xeon 634 scores 52974. The 6505P's nearest rival is the Intel Core i7-14700F at 53620 (0.2% difference), while the 634's closest competitor is the AMD Ryzen AI Embedded P164 at 52901 (0.1% difference).

Q: How do the two chips compare in memory bandwidth?

A: The Xeon 6505P features an eight-channel memory bus delivering 409.6 GB/s, exactly double the Xeon 634's quad-channel 204.8 GB/s. This bandwidth disparity is the likely driver behind the 6505P's large wins in memory-intensive tests like physics (32.9%) and random string sorting (11.4%).

Q: Is the Xeon 634 better at any benchmark?

A: Yes, the Xeon 634 wins 4 of the 17 head-to-head tests. It leads by 10.7% in PassMark single-thread (3567 vs 3187), by 2.1% in extended instructions, and by 0.6% in floating-point math. Its higher boost clock of 4.60 GHz versus 4.10 GHz is the clear differentiator.

Q: Do both processors support ECC memory?

A: Yes, both the Intel Xeon 6505P and the Intel Xeon 634 support ECC memory and both use DDR5. They also share the same Intel Socket 4710, making them drop-in compatible for motherboards that support either chip.

Q: What is the release date difference between the two?

A: The Intel Xeon 6505P was released on 2025-02-23, while the Intel Xeon 634 has a release date of 2026-02-01. The 634 is a newer part, but the 6505P still holds the advantage in most benchmarks.

Q: Which processor has a higher PassMark multithread score?

A: The Xeon 6505P scores 38456 in PassMark multithread, beating the Xeon 634's 37589 by 2.3%. This aligns with the overall trend where the 6505P wins all multi-core composite tests.

Architecture Differences

Both processors are built on the same Granite Rapids architecture and use Intel's 5 nm process node, but they belong to different sub-generations. The Xeon 6505P is part of the Xeon 6 (Granite Rapids-SP) generation, while the Xeon 634 belongs to the Xeon 600 (Granite Rapids-WS) line. This naming distinction hints at different platform optimizations, though both share the same core design with 12 cores and 24 threads.

The most significant architectural divergence is the memory controller. The 6505P features an eight-channel memory bus with 409.6 GB/s of bandwidth, while the 634 is limited to a quad-channel bus at 204.8 GB/s. This is not a minor spec difference — it effectively doubles the data throughput available to the 6505P, which explains why memory-bound workloads like physics and random string sorting show such large performance gaps. The 634's lower bandwidth is compensated by a higher boost clock (4.60 GHz vs 4.10 GHz), suggesting the 634 is tuned for latency-sensitive, lower-thread-count tasks rather than raw data streaming.

Cache hierarchies are identical: both chips have 112 KB of L1 per core, 2 MB of L2 per core, and a shared 48 MB L3 cache. The 6505P has a die size that is not listed, while the 634 measures 598 mm². Both support PCIe Gen 5, but the 6505P offers 88 lanes (CPU only) compared to the 634's 80 lanes, providing more headroom for expansion cards, NVMe drives, or accelerators. Neither processor includes integrated graphics, and both support ECC memory. The 6505P has a locked multiplier, while the 634's multiplier is unlocked, enabling overclocking for users with appropriate server platforms.

Specification Differences

The two chips differ in several key specifications beyond their benchmark scores. The Xeon 6505P has a base clock of 2.20 GHz and a boost clock of 4.10 GHz, while the Xeon 634 runs at a higher 2.70 GHz base and 4.60 GHz boost. Both have the same 150 W TDP, but the 634 achieves higher clocks within that power envelope, likely due to its quad-channel memory controller consuming less power than the 6505P's eight-channel design.

Memory bandwidth is the largest spec gap: 409.6 GB/s for the 6505P versus 204.8 GB/s for the 634, a 2x difference. The memory bus width follows suit — eight-channel versus quad-channel. PCIe lane counts also differ, with the 6505P providing 88 lanes versus 80 lanes on the 634. The 6505P has a launch MSRP of $563, while the 634 is listed at $499. The 634's multiplier is unlocked, whereas the 6505P's is locked. The 6505P's part number is SRVU7, and the 634's is SA2DL. Release dates also differ, with the 6505P launching on 2025-02-23 and the 634 on 2026-02-01.

Where Each One Wins

The Intel Xeon 6505P is the clear choice for multi-threaded, bandwidth-hungry workloads. Its 32.9% lead in PassMark physics and 11.4% lead in random string sorting demonstrate exceptional performance in scientific simulations, data analytics, and database operations that benefit from the doubled memory bandwidth. The 10.7% advantage in prime number finding further cements its suitability for computational mathematics and cryptography tasks. For rendering farms or video encoding jobs that scale across cores, the 6505P's consistent 2.3% Cinebench lead means every frame renders slightly faster. Its 4.3% encryption advantage also makes it the better pick for secure server deployments handling heavy TLS traffic or disk encryption. With 88 PCIe lanes versus 80, the 6505P also supports more expansion devices, making it the superior foundation for dense GPU servers or high-speed storage arrays.

The Intel Xeon 634 is the specialist for single-threaded and latency-critical applications. Its 10.7% lead in PassMark single-thread performance (3567 vs 3187) makes it the better engine for legacy enterprise software that runs on one or two threads, such as certain ERP systems or single-threaded database queries. The 2.1% edge in extended instructions suggests better SIMD throughput for vectorized code, which could benefit specific scientific or engineering applications that use AVX-512-style workloads. Its 0.6% lead in floating-point math, while small, indicates slightly better numerical precision per operation. The unlocked multiplier offers flexibility for users who want to push clock speeds further, and the higher base clock of 2.70 GHz means it delivers better out-of-the-box responsiveness for interactive or real-time workloads. With a lower launch MSRP of $499, the 634 also represents the more economical entry point for single-socket workstations that prioritize per-thread speed over aggregate throughput.