Intel Xeon 6516P-B

Intel Xeon 6516P-B is a 20-core, 40-thread Granite Rapids processor aimed at the server and workstation segment, built on Intel's 5 nm process with a 598 mm² die. The data shows a balanced configuration that prioritizes density and power efficiency over raw peak frequency, with a base clock of 2.30 GHz and a boost clock of 3.50 GHz. This part sits in the 50th percentile of all CPUs in the database, indicating a mid-pack position that requires careful interpretation against its specific workload strengths.

Single-Thread vs Multi-Thread Behavior

The 6516P-B exhibits a 1.52x ratio between its boost and base clocks (3.50 GHz / 2.30 GHz), which is modest compared to typical desktop processors but typical for a server part designed for sustained throughput. The 2.30 GHz base clock is conservative, suggesting the chip is tuned to maintain all 20 cores under full load without exceeding its thermal envelope. In single-threaded tasks, the 3.50 GHz boost provides acceptable responsiveness for administrative tasks, database queries, or light virtualization management, but it will not lead the field against higher-clocked workstation chips.

Multi-threaded behavior is where this processor's design intent becomes clear. With 20 physical cores and 40 threads, the 6516P-B can handle heavily parallel workloads like virtualization hosts, batch data processing, or scientific simulations. The large 80 MB shared L3 cache (4 MB per core) helps mitigate memory latency when all threads are active, reducing the penalty of context switching. The 2 MB per-core L2 cache also supports high per-thread throughput, which matters for workloads with localized data access patterns.

For real-world usage, the split means that mixed workloads — such as a web server running both compute-heavy scripts and database lookups — will benefit from the thread count, while latency-sensitive single-threaded applications will see only moderate performance. The 40-thread count is particularly relevant for concurrent user sessions or containerized microservices, where the operating system can schedule many small tasks simultaneously without contention.

How It Compares

The nearestRivals array in the database is empty, meaning no direct competitive data points are available for this specific SKU. This is noteworthy because it indicates the 6516P-B occupies a niche position without directly comparable alternatives in the current benchmark database. Without rival scores, the analysis must rely on internal characteristics: its 20-core count places it below flagship Xeon parts, but its 80 MB L3 cache and 32 PCIe Gen 5 lanes suggest it targets mid-range server deployments rather than entry-level or extreme high-end.

In the absence of rival comparisons, the 50th percentile ranking provides a baseline. This score implies that in the full CPU database, half of all processors score better and half score worse, but because this percentile is computed across all market segments (including consumer chips), it does not directly translate to server-grade competition. Within the server segment, the 6516P-B's 145 W TDP and quad-channel memory support indicate it is positioned for single-socket workstations or compact dual-socket servers where power budget is a consideration.

The lack of rival data also suggests that the 6516P-B is a specialized part — possibly a custom or OEM variant — given the "B" suffix in its name and the BGA 4368 socket, which is a soldered, non-upgradeable form factor. Users comparing this chip must do so against broader Xeon 6 family members, but without numerical deltas, conclusions must remain qualitative: it is a mid-core-count, high-cache part that trades clock speed for efficiency.

Benchmark Performance

The avgBenchmarkScore for the 6516P-B is 0, and the benchmarks array is empty, meaning no direct performance measurements are recorded in the FACT PACK. This is a critical limitation: the database has not yet captured any runnable benchmark data for this SKU. Consequently, all performance analysis must be inferred from its specifications and the percentile field.

The 50th percentile vs all CPUs is the only quantitative performance signal available. This percentile is likely derived from a combination of core count, clock speed, cache size, and memory bandwidth, rather than actual test results. A score of 50 means this chip sits exactly at the median of the database, which includes desktop processors with fewer cores but higher clocks, and server chips with more cores but lower clocks. For a 20-core server part, this median position is plausible: it outperforms most consumer chips in multi-threaded throughput but lags in single-threaded performance due to the 3.50 GHz boost ceiling.

Comparing to hypothetical rivals within the Xeon 6 family, the 6516P-B's 20 cores are likely below the 32-core or 48-core variants, but its 3.50 GHz boost is competitive for the segment. The 153.6 GB/s memory bandwidth, derived from quad-channel DDR5, is a strong asset for memory-bound workloads like in-memory databases or analytics, where data throughput often bottlenecks core count. The 32 PCIe Gen 5 lanes (CPU only) provide sufficient I/O for multiple NVMe drives or a single high-end GPU, but may be limiting for dense accelerator configurations.

In practical terms, the data suggests this processor will perform admirably in virtualization (many VMs with moderate CPU needs), moderate-scale data processing, and as a workstation CPU for software development or engineering simulations. It will not be the top choice for extreme high-performance computing (HPC) due to the moderate core count, nor for low-power edge deployments due to the 145 W TDP.

FAQ

Q: How many cores and threads does the Intel Xeon 6516P-B have?

A: It has 20 cores and 40 threads, with base and boost clocks of 2.30 GHz and 3.50 GHz, respectively.

Q: What is the cache configuration?

A: The 6516P-B includes 112 KB of L1 cache per core, 2 MB of L2 cache per core, and 80 MB of shared L3 cache.

Q: Does it support ECC memory?

A: Yes, ECC memory is supported, with DDR5 memory over a quad-channel bus providing 153.6 GB/s of bandwidth.

Q: What socket does it use?

A: It uses the Intel BGA 4368 socket, which means the processor is soldered to the board and is not user-upgradeable.

Q: What is the production status and release date?

A: The production status is Active, with a release date of February 23, 2025, and a launch MSRP of $1544.

Q: What PCIe lanes are available?

A: It provides 32 PCIe Gen 5 lanes from the CPU, suitable for high-speed storage or accelerator connectivity.

Power and Thermals

The 6516P-B has a TDP of 145 W, which places it in the mid-range for server processors. This power envelope allows for air cooling in most chassis, though a capable air cooler with a robust fan curve is recommended for sustained all-core loads. The 2.30 GHz base clock is intentionally set to keep power draw within this budget while all 20 cores are active; the 3.50 GHz boost is likely limited to single- or few-core scenarios where thermal headroom is available.

For cooling tier, this TDP class typically requires a tower-style air cooler or a low-profile server heatsink with high static pressure. In dense rack deployments, a 1U or 2U server with a passive heatsink and chassis airflow would suffice, given that the 145 W TDP is below the 200 W+ threshold where liquid cooling becomes mandatory. The 5 nm process node helps efficiency, but the 598 mm² die size suggests a higher transistor count that still generates significant heat under load.

Power management is likely a strength, as Granite Rapids architecture supports advanced C-states and frequency scaling. The data shows no unlocked multiplier, meaning overclocking is not supported; this is standard for server parts where stability and power predictability are paramount. The 145 W TDP also implies that power delivery requirements are moderate, compatible with standard server VRM designs.

Platform and Compatibility

The 6516P-B uses the Intel BGA 4368 socket, which is a soldered package designed for embedded or custom server boards rather than standard LGA sockets. This choice limits upgradeability: the processor cannot be removed or replaced without replacing the entire motherboard. For system integrators, this means the board must be selected with the CPU already mounted, which is typical for compact edge servers or workstations where space is at a premium.

Memory support includes DDR5 over a quad-channel bus, yielding 153.6 GB/s of theoretical bandwidth. ECC memory is enabled, which is critical for error-sensitive workloads like financial transactions or scientific computing. The quad-channel configuration supports up to four memory modules for optimal bandwidth; using fewer modules will halve or quarter the available bandwidth, so populate all channels for best performance.

PCIe connectivity is Gen 5 with 32 lanes from the CPU. This supports high-bandwidth devices such as NVMe SSDs (each Gen 5 x4 lane provides up to 16 GB/s), a single GPU at x16, or multiple accelerators at x8 each. The "CPU only" designation means these lanes are directly from the processor, without a separate chipset, simplifying board design but limiting total I/O expansion compared to chipsets that add extra lanes. The upgrade path is effectively confined to the initial build; the BGA socket and soldered design preclude swapping to a higher-tier Xeon later. For organizations planning multi-year deployments, this requires upfront specification of the exact core count needed, as the 20-core configuration is fixed.