Intel Core i5-2500K vs Intel Xeon W-2104 Comparison

Where Each One Wins

The benchmark data paints a remarkably one-sided picture in this comparison. The Intel Xeon W-2104 wins all five recorded head-to-head tests, with no benchmark victories for the Intel Core i5-2500K. The Xeon's advantage is consistent and substantial across every workload category.

In multi-threaded rendering, the Xeon W-2104 posts a Cinebench R23 multi-core score of 4669, while the Core i5-2500K manages 3523. That is a 32.5% margin in favor of the newer workstation part. The same pattern repeats in Cinebench R20 multi-core, where the Xeon scores 1960 versus the i5's 1479, a 32.5% difference. Even in the older Cinebench R15 multi-core test, the Xeon's 470 score outpaces the i5's 354 by 32.8%.

Single-thread performance follows the identical trajectory. The Xeon W-2104 records a Cinebench R23 single-core score of 659, against 497 for the i5-2500K, a 32.6% edge. In Cinebench R20 single-core, the Xeon's 276 beats the i5's 208 by 32.7%. For any workload that depends on per-core throughput, the Xeon is the clear pick.

The Core i5-2500K does have one advantage not captured in the head-to-head matrix: an unlocked multiplier. That allows overclocking, which could narrow the gap in real-world use. However, the database records no overclocked benchmark scores, so the measured results reflect stock performance only.

The Xeon W-2104 also targets a different use case. It is a server/workstation part with ECC memory support, quad-channel DDR4, and 48 PCIe Gen 3 lanes. The i5-2500K is a desktop chip with dual-channel DDR3, no ECC, and 16 PCIe Gen 2 lanes. The Xeon is built for sustained throughput in professional environments; the i5 is built for everyday desktop use with overclocking headroom.

The percentile rankings reinforce this split. The Xeon sits at the 36th percentile of all CPUs in the database, while the i5 sits at the 35th percentile. Their average benchmark scores are close, 1350 for the Xeon against 1329 for the i5, but the Xeon's edge in every recorded test makes it the stronger performer where it matters.

Architecture Differences

The two processors come from different eras of Intel design. The Xeon W-2104 is built on the Skylake-W architecture using a 14 nm process node, while the Core i5-2500K uses the Sandy Bridge architecture on a 32 nm node. That process gap explains much of the performance difference: the Xeon packs more modern transistors into a larger 484 mm² die, compared to the i5's 216 mm² die with 1,160 million transistors.

Both chips have four cores and four threads, so thread count is identical. The differences lie in supporting infrastructure. The Xeon W-2104 carries 64 KB of L1 cache per core and 1 MB of L2 cache per core, with 8.25 MB of shared L3 cache. The i5-2500K also has 64 KB of L1 per core, but only 256 KB of L2 per core and 6 MB of shared L3. The Xeon's larger caches give it more room to keep frequently accessed data close to the cores.

Memory architecture diverges sharply. The Xeon supports DDR4 memory over a quad-channel bus, delivering 85.3 GB/s of memory bandwidth. The i5 uses DDR3 over a dual-channel bus, with 25.6 GB/s. That is a 3.3x difference in theoretical memory bandwidth, which matters for workloads that stream large datasets.

The Xeon supports ECC memory, a requirement for many workstation and server deployments where data integrity is critical. The i5 does not. The Xeon also provides 48 PCIe Gen 3 lanes from the CPU, versus 16 PCIe Gen 2 lanes on the i5. That difference enables the Xeon to drive multiple GPUs, NVMe storage devices, or high-speed networking cards without going through the chipset.

The i5 includes integrated graphics in the form of Intel HD 3000. The Xeon has no integrated graphics at all, which is standard for workstation parts that expect a discrete GPU. The i5 also has an unlocked multiplier for overclocking, while the Xeon's multiplier is locked.

The sockets differ as well: the Xeon uses Intel Socket 2066, while the i5 uses Intel Socket 1155. The Xeon's TDP is higher at 120 watts, reflecting the larger die and additional memory controllers, versus 95 watts for the i5. The Xeon was released in 2017, while the i5 arrived in 2011. Both are now end-of-life products.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The Intel Xeon W-2104 wins every recorded multi-core test. It scores 4669 in Cinebench R23 multi-core versus 3523 for the Core i5-2500K, a 32.5% advantage, and 1960 versus 1479 in Cinebench R20 multi-core, also a 32.5% margin.

Q: Is the Core i5-2500K better for single-threaded tasks?

A: No. The Xeon W-2104 leads in both single-core tests. It scores 659 in Cinebench R23 single-core versus 497 for the i5, a 32.6% edge, and 276 versus 208 in Cinebench R20 single-core, a 32.7% margin.

Q: Do both processors have the same number of cores and threads?

A: Yes, both have four cores and four threads. The performance gap comes from architectural differences, cache sizes, memory bandwidth, and process node, not from core count.

Q: Which processor supports ECC memory?

A: Only the Intel Xeon W-2104 supports ECC memory. The Core i5-2500K does not, which limits its suitability for error-sensitive workstation or server workloads.

Q: Can the Core i5-2500K be overclocked?

A: Yes, the i5-2500K has an unlocked multiplier. The Xeon W-2104's multiplier is locked, so it cannot be overclocked in the same way. The database benchmarks reflect stock settings for both.

Q: How do the two compare in memory bandwidth?

A: The Xeon W-2104 uses quad-channel DDR4 with 85.3 GB/s of bandwidth. The Core i5-2500K uses dual-channel DDR3 with 25.6 GB/s. The Xeon offers substantially more memory throughput.

Specification Differences

The two processors differ on nearly every specification beyond core count and thread count. The Xeon W-2104 has a base clock of 3.20 GHz with no boost clock listed, while the i5-2500K has a 3.30 GHz base clock and a 3.70 GHz boost clock. Despite the i5's higher clocks, the Xeon wins all benchmark tests, indicating that IPC and memory subsystem advantages outweigh the clock deficit.

The Xeon uses a 14 nm process, the i5 uses 32 nm. The Xeon's die is 484 mm², the i5's is 216 mm². The Xeon has 1 MB of L2 cache per core versus 256 KB per core on the i5, and 8.25 MB of shared L3 versus 6 MB. The Xeon supports DDR4 memory over a quad-channel bus; the i5 supports DDR3 over a dual-channel bus. Memory bandwidth is 85.3 GB/s for the Xeon and 25.6 GB/s for the i5.

ECC memory support is present on the Xeon, absent on the i5. The Xeon offers 48 PCIe Gen 3 lanes, the i5 offers 16 PCIe Gen 2 lanes. The Xeon has no integrated graphics; the i5 includes Intel HD 3000. The Xeon's TDP is 120 watts, the i5's is 95 watts. The Xeon uses Socket 2066, the i5 uses Socket 1155. The Xeon's multiplier is locked, the i5's is unlocked. The Xeon launched at a price of $255, the i5 at $216, though pricing is not a factor in performance analysis.

Head-to-Head Benchmarks

The largest single margin in the head-to-head results is in Cinebench R15 multi-core, where the Xeon W-2104 scores 470 against the i5-2500K's 354, a 32.8% difference. This test is heavily threaded and memory-sensitive, so the Xeon's quad-channel DDR4 and larger caches likely contribute to the outcome.

Cinebench R23 multi-core shows a 32.5% gap, with the Xeon at 4669 and the i5 at 3523. The consistency of the margin across different versions of Cinebench suggests the performance difference is fundamental to the architectures rather than specific to one test version. Cinebench R20 multi-core repeats the pattern: 1960 for the Xeon, 1479 for the i5, again a 32.5% difference.

Single-core results are equally lopsided. Cinebench R23 single-core gives the Xeon 659 and the i5 497, a 32.6% margin. Cinebench R20 single-core gives the Xeon 276 and the i5 208, a 32.7% margin. The fact that the single-core gap nearly matches the multi-core gap indicates that per-core efficiency, not core scaling, is the primary differentiator.

The i5-2500K does have additional benchmark entries in the database that are not part of the head-to-head matrix, including Geekbench multi-core at 2434 and Geekbench single-core at 805. The Xeon W-2104 has no recorded Geekbench scores, so no direct comparison is possible for that test.

The average benchmark scores tell a similar story. The Xeon averages 1350 across its recorded benchmarks, while the i5 averages 1329. The Xeon's nearest rivals are the Core i5-7400T, Core i5-4670, Xeon E3-1226 v3, and Core i5-4590T, with average scores ranging from 1340 to 1357. The i5-2500K's nearest rivals are the Core i5-4460S, Core i5-760, Celeron G6900T, and Celeron G6900E, with average scores from 1321 to 1337. Both processors sit in a similar performance tier overall, but the Xeon is consistently ahead in every shared test.

For buyers choosing between these two end-of-life parts, the data is unambiguous. The Xeon W-2104 outperforms the Core i5-2500K in every measured benchmark, with margins between 32.5% and 32.8%. The i5's only advantages are its unlocked multiplier and its integrated graphics, neither of which appears in the benchmark results. The Xeon's workstation-class features, including ECC memory, quad-channel DDR4, and 48 PCIe lanes, make it the more capable processor for professional workloads. The i5 remains a serviceable desktop chip, but it cannot match the Xeon's performance in the database's recorded tests.