Intel Core i7-875K

The Intel Core i7-875K occupies a distinct position in the benchmark hierarchy, landing at the 26th percentile of all CPUs. Its average benchmark score of 970 places it in a tight cluster where a single point separates it from its nearest rivals. The data reveals a processor that was competitive at launch but has since been overtaken by architectural advancements, making its current standing a matter of historical interest rather than modern relevance.

How It Comptes

The Intel Xeon X5570 is a statistical twin, matching the i7-875K with an identical average score of 970 and a deltaPct of 0. Both processors share the Nehalem architecture, though the Xeon targets server platforms while the i7 serves desktop users. The benchmark data shows no meaningful performance separation, indicating that the unlocked multiplier on the i7-875K is its primary differentiator rather than raw compute capability.

Against the AMD PRO A8-9600, the i7-875K trails by a negligible 0.1 percent. The AMD part scores 971 on average, a margin so thin it falls within typical run-to-run variance. This near-parity is notable because the PRO A8-9600 is a much later design, suggesting that the i7-875K's four cores and eight threads still deliver competitive throughput in multi-threaded scenarios despite its age.

The Intel Xeon X3470 edges ahead by 0.1 percent with a score of 969. This rival shares the same Lynnfield die and 1156 socket, making the comparison almost a direct A-B test of binning and clock behavior. The i7-875K's slightly higher score aligns with its unlocked multiplier, which allows for manual frequency adjustments that the locked Xeon cannot match.

The Intel Pentium Gold G5500T is 0.2 percent behind with a score of 968. This comparison highlights the stark generational gap: the Pentium achieves near-parity with only two cores and four threads, relying on far higher IPC from a newer architecture. The i7-875K compensates with double the core count, but the efficiency of the Pentium's design is evident in the close scores.

Power and Thermals

The i7-875K carries a TDP of 95 watts, a figure that places it in the mainstream desktop class for its era. This rating implies a need for a capable air cooler rather than exotic liquid solutions, as the 45 nm Lynnfield die generates moderate heat under sustained loads. The 95-watt envelope also suggests that the unlocked multiplier can be exploited with some thermal headroom, though the data does not specify maximum safe overclocking limits.

The 45 nm process node, with 774 million transistors packed into a 296 mm² die, contributes to the thermal profile. This geometry is dense for its time but inefficient by modern standards, meaning the 95-watt TDP reflects a design that runs warmer than a comparable modern chip would. The lack of integrated graphics on this processor means all thermal output comes from the compute cores, simplifying cooling requirements.

Benchmark Performance

In Cinebench R23 multi-core, the i7-875K scores 2670, while its nearest rivals cluster around the 970 average across all tests. The single-core R23 score of 377 reveals the architectural age, as modern low-end chips often exceed this by several multiples. The multi-core score of 2670 is roughly seven times the single-core figure, indicating strong scaling across the four physical cores and eight threads.

The Cinebench R20 results show a multi-core score of 1121 against a single-core score of 158, a ratio of approximately 7.1. This scaling efficiency suggests the Lynnfield architecture handles threaded workloads well, with minimal contention between cores. The R15 multi-core score of 269 is comparable to the R20 figure when accounting for the different workload scaling between benchmark versions.

Geekbench results tell a similar story, with a multi-core score of 1696 and a single-core score of 499. The multi-core to single-core ratio here is 3.4, lower than the Cinebench ratios, indicating that Geekbench's workload mix is less dependent on thread scaling. The average benchmark score of 970 across all tests masks the wide variance between single-thread and multi-thread scenarios, with multi-core results being substantially stronger relative to the field.

Platform and Compatibility

The i7-875K uses the Intel Socket 1156 interface, a platform that supports the Lynnfield architecture natively. Memory support is limited to DDR3 in a dual-channel configuration, delivering a memory bandwidth of 21.3 GB/s. This bandwidth figure is modest by modern standards but was competitive for the 2010 timeframe, and the dual-channel layout is sufficient for the four-core design.

PCIe connectivity is Gen 2 with 16 lanes available from the CPU only. This configuration provides a direct link for a single high-bandwidth graphics card, though multi-GPU setups would need to negotiate lane allocation. The absence of integrated graphics means a discrete GPU is mandatory, and the 16 lanes are dedicated exclusively to that purpose.

ECC memory is not supported, which aligns with the consumer desktop positioning. The production status is end-of-life, and the launch MSRP was $353. The multiplier is unlocked, a rarity at the time, which allows users to adjust clock speeds without altering the base clock. The part number SLBS2 identifies the specific stepping, and the release date of 2010-05-29 marks the beginning of its availability.

FAQ

Q: Does the Intel Core i7-875K support ECC memory?

A: No, the processor does not support ECC memory, as indicated by the false value in the memory specifications.

Q: What is the socket type for this processor?

A: The i7-875K uses Intel Socket 1156, which is compatible with Lynnfield-based motherboards from that generation.

Q: How many PCIe lanes does the CPU provide?

A: The CPU provides 16 PCIe Gen 2 lanes, which are available directly from the processor rather than through the chipset.

Q: Is the multiplier unlocked on this chip?

A: Yes, the multiplierUnlocked field shows a value of true, allowing users to adjust the clock multiplier for overclocking purposes.

Q: What is the memory bandwidth capability?

A: The dual-channel DDR3 memory controller delivers a theoretical bandwidth of 21.3 GB/s.

Q: What is the production status of the i7-875K?

A: The production status is end-of-life, meaning Intel no longer manufactures this processor.

Who Should Consider It

For gaming workloads, the i7-875K presents a mixed case. The single-core score of 377 in Cinebench R23 is low by modern standards, which will bottleneck many contemporary games that rely on strong single-thread performance. The Geekbench single-core score of 499 reinforces this limitation, suggesting that frame rates in CPU-bound titles will be constrained. However, the multi-core capability of 2670 in R23 means older games that utilize multiple threads adequately may still run acceptably.

Content creation tasks that scale well with multiple cores could benefit from the i7-875K's eight threads. The Cinebench R20 multi-core score of 1121 demonstrates reasonable throughput for video encoding or 3D rendering, though the absolute performance is far below modern processors. The 0.1 percent delta against the AMD PRO A8-9600 shows that in purely threaded workloads, this older chip can still match a much newer competitor.

Office productivity and general desktop use are where the i7-875K becomes serviceable but unremarkable. The single-core performance, while weak relative to modern parts, is sufficient for basic tasks like web browsing, document editing, and spreadsheet work. The 26th percentile ranking across all CPUs means most workloads will complete without frustration, but the lack of modern instruction sets and lower IPC will be noticeable in responsive tasks.

Single-Thread vs Multi-Thread Behavior

The split between single-thread and multi-thread performance is stark and defines the i7-875K's character. In Cinebench R23, the multi-core score of 2670 is 7.1 times the single-core score of 377, indicating excellent scaling across the eight threads. This ratio suggests that the Lynnfield architecture has minimal overhead when coordinating multiple cores, and the shared 8 MB L3 cache helps reduce inter-core communication latency.

Geekbench presents a different picture, with a multi-core score of 1696 only 3.4 times the single-core score of 499. This lower ratio implies that Geekbench's workload mix includes more memory-latency-sensitive tasks that do not scale perfectly with additional cores. The dual-channel memory bus, delivering 21.3 GB/s, may act as a bottleneck in these scenarios, limiting the gains from additional threads.

The practical implication is that the i7-875K excels in throughput-oriented tasks like rendering or batch processing, where the 7.1x scaling in Cinebench shows near-linear gains. For interactive workloads that depend on low-latency single-thread execution, the chip falls behind, as evidenced by the 377 single-core score in R23. This behavioral split means users must match their workloads to the processor's strengths, favoring multi-threaded applications while accepting compromises in single-threaded responsiveness.