Intel Core i5-4258U vs Intel Xeon X5550 Comparison

Head-to-Head Benchmarks

The recorded data is unambiguous: the Intel Xeon X5550 wins every single head-to-head benchmark in the database against the Intel Core i5-4258U. Across five Cinebench tests, the Xeon X5550 leads by margins ranging from 13.8% to 14.3%. This is not a close contest by any measure; the Xeon X5550 is consistently ahead in both multi-core and single-core workloads.

In Cinebench R15 multi-core, the Xeon X5550 scores 259 against the Core i5-4258U's 222, a 14.3% advantage. The R20 multi-core test shows a similar gap: 1083 versus 929, or 14.2% ahead. R23 multi-core repeats the pattern with 2580 versus 2213, again 14.2% ahead. The single-core results are equally one-sided. In R20 single-core, the Xeon X5550 posts 152 versus 131, a 13.8% lead. In R23 single-core, it scores 364 versus 312, a 14.3% margin. The consistency of these deltas across different Cinebench versions, which place different demands on the processor, indicates that the Xeon X5550 has a fundamental performance advantage that is not workload-dependent.

The Core i5-4258U has zero wins in the head-to-head comparison. Its only benchmark entries outside the Cinebench suite are Geekbench results: a multi-core score of 1664 and a single-core score of 844. The Xeon X5550 has no corresponding Geekbench entries in the database, so no direct comparison is possible for that test. However, the Cinebench results are sufficient to establish the overall hierarchy.

Looking at the broader database context, both processors sit at the 24th percentile among all CPUs, meaning they are in the same performance tier relative to the entire field. The Core i5-4258U has an average benchmark score of 902, while the Xeon X5550 averages 888. These averages are close, but the head-to-head data shows the Xeon X5550 is the stronger performer in the tests where they meet directly. The Core i5-4258U's nearest rivals in the database include the Core i5-5350U at 903 (0.1% ahead), the Core i7-940 at 903 (0.2% ahead), and the AMD A10-7860K at 904 (0.2% ahead). The Xeon X5550's nearest rivals include the Core i3-6100 at 888 (0% difference), the Pentium G4560T at 887 (0.1% behind), and the Core i7-860 at 886 (0.2% behind). These proximity values confirm that both chips are tightly grouped with other mid-range processors from their respective eras.

Architecture Differences

The two processors come from fundamentally different architectural generations and manufacturing nodes. The Intel Core i5-4258U is built on the Haswell architecture using a 22 nm process node, with a die size of 118 mm² and 1,400 million transistors. The Intel Xeon X5550 uses the Nehalem architecture (codenamed Gainestown) on a 45 nm process node, with a larger die of 263 mm² but fewer transistors at 731 million. The 22 nm process gives the Core i5-4258U a significant density advantage: it packs nearly twice the transistor count into less than half the die area.

Core and thread counts differ substantially. The Core i5-4258U has 2 cores and 4 threads, while the Xeon X5550 has 4 cores and 8 threads. This explains the Xeon's multi-core advantage in the benchmark results. The Xeon X5550 can process twice as many threads simultaneously, which directly contributes to its 14% lead in multi-core Cinebench tests despite its older architecture.

Cache configurations also differ. Both have 64 KB of L1 cache per core and 256 KB of L2 cache per core. The L3 cache is where they diverge: the Core i5-4258U has 3 MB shared, while the Xeon X5550 has 8 MB shared. The larger L3 cache on the Xeon X5550 is consistent with its server/workstation positioning and likely helps in workloads with large working sets.

Clock speeds are close but slightly favor the Xeon X5550. The Core i5-4258U has a base clock of 2.40 GHz and a boost clock of 2.90 GHz. The Xeon X5550 has a base clock of 2.67 GHz and a boost clock of 3.07 GHz. The Xeon's higher clocks, combined with its greater core count, contribute to its lead in both single-core and multi-core tests.

Memory support shows another key difference. Both support DDR3, but the Xeon X5550 features triple-channel memory and supports ECC memory. The Core i5-4258U does not support ECC and has no memory bus specification listed. The Xeon X5550 also supports PCIe Gen 2, while the Core i5-4258U has no PCIe specification recorded. The Xeon's ECC support and triple-channel memory are enterprise-oriented features absent from the mobile Core chip.

Integrated graphics is a major differentiator. The Core i5-4258U includes Intel HD 5100 graphics, while the Xeon X5550 has no integrated graphics at all. This is expected given their market segments: the Core i5-4258U is a mobile processor, while the Xeon X5550 is a server/workstation part that expects a discrete GPU.

Thermal design power differs dramatically. The Core i5-4258U has a TDP of 28 watts, while the Xeon X5550 has a TDP of 95 watts. The Xeon consumes over three times the power budget, which is a direct consequence of its higher core count, higher clocks, and older manufacturing node.

The sockets are incompatible: the Core i5-4258U uses Intel BGA 1168 (a mobile soldered socket), while the Xeon X5550 uses Intel Socket 1366. This means they cannot be swapped into the same system.

Release dates are several years apart. The Xeon X5550 was released on 2009-03-29, while the Core i5-4258U was released on 2013-06-03. The Xeon is also marked as end-of-life in the database, while the Core i5-4258U has no production status listed.

The Verdict

The data indicates a clear winner for raw processing performance: the Intel Xeon X5550. It wins all five head-to-head Cinebench tests, with advantages of 13.8% to 14.3% in both single-core and multi-core workloads. Its 4 cores and 8 threads, combined with higher base and boost clocks, give it a decisive edge over the Core i5-4258U's 2 cores and 4 threads. The Xeon's 8 MB of L3 cache and triple-channel DDR3 support further reinforce its position as the more capable computing engine.

However, the Core i5-4258U is not without its own advantages. Its 28 watt TDP is a fraction of the Xeon's 95 watts, making it suitable for thin and light mobile systems. It includes Intel HD 5100 integrated graphics, eliminating the need for a separate GPU. Its 22 nm process node and newer Haswell architecture make it more power-efficient per unit of work. For a mobile user who needs a capable processor with low power draw and integrated graphics, the Core i5-4258U is the appropriate choice.

For anyone building or upgrading a workstation or server system on Socket 1366, the Xeon X5550 is the superior processor. It offers ECC memory support, which is critical for data integrity in server environments. Its triple-channel memory bus provides greater memory bandwidth potential. Its 8 MB L3 cache and 8 threads make it better suited for virtualization, database work, and multi-threaded rendering.

The database places both CPUs at the 24th percentile, meaning neither is a high-end part by modern standards. But within this pairing, the Xeon X5550 is the performance winner by a consistent margin. The Core i5-4258U wins on power efficiency and integrated graphics, which are not captured in the Cinebench scores but are relevant for its mobile market segment.

FAQ

Q: Which processor is faster in multi-core Cinebench tests?

A: The Intel Xeon X5550 wins all three multi-core tests. It scores 259 in R15 versus 222, 1083 in R20 versus 929, and 2580 in R23 versus 2213. The margin is 14.2% to 14.3% in each case.

Q: Does the Core i5-4258U win any benchmark in the head-to-head comparison?

A: No. The Core i5-4258U has zero wins across the five recorded head-to-head Cinebench tests. Its only other benchmarks are Geekbench scores of 1664 multi-core and 844 single-core, for which the Xeon X5550 has no recorded comparison.

Q: Can I use ECC memory with either processor?

A: Only the Intel Xeon X5550 supports ECC memory. The Core i5-4258U does not support ECC.

Q: What are the core and thread counts for each chip?

A: The Core i5-4258U has 2 cores and 4 threads. The Xeon X5550 has 4 cores and 8 threads.

Q: Which processor has integrated graphics?

A: The Core i5-4258U includes Intel HD 5100 integrated graphics. The Xeon X5550 has no integrated graphics.

Q: What is the TDP difference between the two?

A: The Core i5-4258U has a TDP of 28 watts. The Xeon X5550 has a TDP of 95 watts.

Where Each One Wins

The Intel Xeon X5550 wins in every measured performance category in the head-to-head data. It is ahead in Cinebench R15 multi-core (259 versus 222), R20 multi-core (1083 versus 929), R20 single-core (152 versus 131), R23 multi-core (2580 versus 2213), and R23 single-core (364 versus 312). The margin is nearly uniform, suggesting the Xeon's advantage comes from its combination of more cores and higher clock speeds rather than any single architectural feature. Users who need maximum multi-threaded throughput, ECC memory support, or triple-channel memory bandwidth should choose the Xeon X5550.

The Core i5-4258U wins in efficiency and platform features. Its 28 watt TDP makes it suitable for compact, passively cooled or lightly cooled mobile devices. The integrated Intel HD 5100 graphics means a system built around it does not require a discrete GPU for basic display output. Its 22 nm process node and 1,400 million transistors in a 118 mm² die reflect a much more modern manufacturing process. For a mobile workstation or ultrabook-class system where power draw and integrated graphics matter more than raw compute, the Core i5-4258U is the better fit.

The Xeon X5550 also wins on memory features. Its triple-channel memory bus and ECC support are absent from the Core i5-4258U. It supports PCIe Gen 2, which is not listed for the Core i5. These features target server and workstation environments where data integrity and memory bandwidth are priorities. The Core i5-4258U has no equivalent enterprise feature set.

In terms of platform longevity, the Xeon X5550 is marked as end-of-life, while the Core i5-4258U has no production status listed. This suggests the Core i5 may still be in production, which could matter for availability. However, the Xeon's end-of-life status does not diminish its benchmark performance in the recorded data.

Specification Differences

The two processors differ in nearly every major specification category. The Core i5-4258U has 2 cores and 4 threads; the Xeon X5550 has 4 cores and 8 threads. Base clocks are 2.40 GHz versus 2.67 GHz, and boost clocks are 2.90 GHz versus 3.07 GHz in favor of the Xeon. TDP is 28 watts for the Core i5 and 95 watts for the Xeon.

The sockets are different: Intel BGA 1168 for the Core i5-4258U versus Intel Socket 1366 for the Xeon X5550. The architecture and codename differ: Haswell for the Core i5, Nehalem (Gainestown) for the Xeon. Process nodes are 22 nm versus 45 nm. Transistor counts are 1,400 million versus 731 million, and die sizes are 118 mm² versus 263 mm².

L3 cache is 3 MB shared on the Core i5-4258U and 8 MB shared on the Xeon X5550. Both have 64 KB L1 and 256 KB L2 per core. Memory support is DDR3 for both, but the Xeon adds triple-channel memory and ECC support. The Core i5-4258U has Intel HD 5100 integrated graphics; the Xeon has none. The Core i5 is in the mobile market segment, while the Xeon is in the server/workstation segment. Release dates differ: 2013-06-03 for the Core i5, 2009-03-29 for the Xeon. The Xeon is end-of-life; the Core i5 has no production status listed. PCIe support is Gen 2 on the Xeon, with no PCIe specification recorded for the Core i5. Neither processor has an unlocked multiplier.