Intel Core i5-4250U vs Intel Xeon E5520 Comparison

Head-to-Head Benchmarks

The benchmark data is unambiguous: the Intel Xeon E5520 wins every recorded head-to-head test, and it wins by a remarkably consistent margin. Across five Cinebench workloads, the Xeon outperforms the Core i5-4250U by roughly 16% in every single case. The deltas range from -15.7% to -16.1% from the Core i5's perspective, which means the Xeon's advantage is essentially uniform regardless of whether the workload is single-threaded or multi-threaded.

In Cinebench R15 multicore, the Xeon E5520 scores 217 against the Core i5-4250U's 182, a 16.1% gap. The R20 multicore test shows the same story: 905 for the Xeon versus 760 for the Core i5, a 16% difference. Even in single-core tests, where the Core i5's modern architecture might be expected to close the gap, the Xeon maintains its lead. Cinebench R20 single-core shows 127 for the Xeon against 107 for the Core i5, a 15.7% margin. The R23 tests confirm the pattern: multicore at 2155 versus 1811, single-core at 304 versus 255, both at 16% deltas.

The consistency of these margins is notable. It suggests the Xeon's advantage is not workload-specific but rather a general performance lead across the board. The Core i5-4250U does not claim a single victory in any benchmark listed in the database. Its wins column is zero; the Xeon's is five.

Looking at the broader database positioning, both processors sit at the 20th percentile among all CPUs, meaning they occupy similar tiers in the overall performance distribution. The Core i5-4250U's average benchmark score is 756, while the Xeon E5520 averages 742. That is a curious inversion: the Core i5 has a slightly higher average score across its recorded benchmarks, yet the Xeon wins every direct comparison. This is because the two chips were tested on different benchmark sets, and the Core i5's Geekbench results, which are not present in the Xeon's data, help lift its average.

The nearest rivals for the Core i5-4250U are the Intel Xeon E5450 (average score 756, delta -0.1%), the Core i3-5020U (757, -0.2%), the Core i5-3230M (754, +0.2%), and the Core i5-3210M (758, -0.2%). These are extremely tight deltas, indicating the Core i5-4250U sits squarely in a cluster of similarly performing processors. The Xeon E5520's nearest rivals include the AMD Phenom II X4 B97 (741, +0.1%), the Core i5-670 (741, +0.2%), the Core i7-860S (740, +0.3%), and the Pentium G4400 (740, +0.3%). Its average score of 742 places it just below that cluster, yet its direct head-to-head results against the Core i5 are consistently favorable.

Architecture Differences

These two processors come from different eras and different design philosophies. The Core i5-4250U is a Haswell-generation part, built on Intel's 22 nm process with 1,400 million transistors packed into a 118 mm² die. The Xeon E5520 is a Nehalem-generation part, codenamed Gainestown, built on a 45 nm process with 731 million transistors and a 263 mm² die. The process node difference is significant: 22 nm versus 45 nm means the Core i5 uses transistors roughly half the size of the Xeon's, which explains how it achieves dramatically lower power consumption despite running more modern logic.

The core configurations are fundamentally different. The Core i5-4250U has 2 cores and 4 threads, while the Xeon E5520 doubles that to 4 cores and 8 threads. This is a massive structural advantage for the Xeon in heavily multithreaded workloads, and it explains why the Xeon maintains its lead even in single-core tests: its base clock of 2.27 GHz and boost clock of 2.53 GHz are both substantially higher than the Core i5's 1.30 GHz base and 2.60 GHz boost. The Core i5's boost clock barely exceeds the Xeon's base clock, and its base clock is nearly a gigahertz lower.

Cache hierarchies differ as well. Both chips have 64 KB of L1 per core and 256 KB of L2 per core, but the shared L3 cache is 3 MB on the Core i5 versus 8 MB on the Xeon. That is a 5 MB difference in favor of the Xeon, which matters for workloads with large working sets. The Xeon also supports ECC memory, while the Core i5 does not, and it offers a triple-channel memory bus compared to the Core i5's unspecified memory bus configuration. Both support DDR3 memory.

The integrated graphics situation is a major differentiator. The Core i5-4250U includes Intel HD 5000 graphics, while the Xeon E5520 has no integrated graphics at all. This makes the Core i5 a complete package for a laptop or small form factor system, while the Xeon requires a discrete GPU. The Core i5 is also a mobile part, using the Intel BGA 1168 socket, whereas the Xeon targets the server and workstation market with the Intel Socket 1366. The Xeon's production status is listed as end-of-life, while the Core i5's is not specified. The Xeon also supports PCIe Gen 2, while the Core i5's PCIe support is not listed in the database.

Power consumption is a stark contrast. The Core i5-4250U has a TDP of 15 watts, while the Xeon E5520 draws 80 watts. That is more than a fivefold difference. The Core i5 is designed for ultraportable and low-power systems; the Xeon is designed for servers and workstations where power efficiency is secondary to throughput and reliability.

Release dates reinforce the generational gap. The Core i5-4250U launched in June 2013, while the Xeon E5520 arrived in March 2009, over four years earlier. Despite being the older part, the Xeon's extra cores and higher clocks give it a consistent performance edge in the recorded benchmarks.

FAQ

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

A: The Xeon E5520 wins all recorded multi-core tests. In Cinebench R23 multicore, it scores 2155 against the Core i5-4250U's 1811, a 16% advantage. The R20 multicore test shows 905 versus 760, and R15 multicore shows 217 versus 182.

Q: Does the Core i5-4250U win any benchmark?

A: No. Across all five recorded head-to-head tests, the Xeon E5520 wins every one. The Core i5-4250U has zero recorded wins in the head-to-head data.

Q: Is the Core i5-4250U more power efficient?

A: Yes, dramatically so. The Core i5-4250U has a TDP of 15 watts, while the Xeon E5520 has a TDP of 80 watts. The Core i5 also uses a 22 nm process node versus the Xeon's 45 nm node.

Q: Can the Xeon E5520 use integrated graphics?

A: No. The Xeon E5520 has no integrated graphics. The Core i5-4250U includes Intel HD 5000 graphics, making it a self-contained solution for systems without a discrete GPU.

Q: Which processor supports ECC memory?

A: Only the Xeon E5520 supports ECC memory. The Core i5-4250U does not list ECC support in the database.

Q: How do these processors compare in single-core performance?

A: The Xeon E5520 wins in single-core tests as well. Cinebench R20 single-core shows 127 for the Xeon versus 107 for the Core i5, a 15.7% lead. R23 single-core shows 304 versus 255, a 16.1% lead.

The Verdict

The data points to a clear conclusion: if raw compute performance is the priority, the Xeon E5520 is the better processor. It wins every benchmark in the head-to-head comparison, and it does so by a consistent margin of roughly 16%. The extra cores, higher base clock, larger L3 cache, and ECC support make it the stronger choice for server, workstation, or any compute-focused build where power consumption is not a primary concern.

However, the Core i5-4250U is not without its own logic. Its 15 watt TDP makes it suitable for systems where power efficiency is critical, such as ultraportable laptops or fanless designs. The integrated Intel HD 5000 graphics mean it can run a display without a discrete GPU, which is impossible with the Xeon. The Core i5 is also a much newer design, built on a 22 nm process with over 1.4 billion transistors, and its boost clock of 2.60 GHz is actually higher than the Xeon's 2.53 GHz boost.

The Xeon's age is a factor. It is marked as end-of-life, launched in 2009, and built on a 45 nm process. But the benchmark data shows that age does not translate to weakness in this comparison. The Xeon's 4 cores and 8 threads simply outclass the Core i5's 2 cores and 4 threads in every recorded test.

For a builder choosing between these two, the decision hinges on the use case. A low-power mobile or compact system benefits from the Core i5's integrated graphics and 15 watt TDP. A system where performance matters more than power draw, and where a discrete GPU is already planned, favors the Xeon. The average benchmark scores in the database are close, 756 for the Core i5 and 742 for the Xeon, but the head-to-head results are not close at all. The Xeon wins where it matters.

Specification Differences

The two processors differ in nearly every major specification category. The Core i5-4250U has 2 cores and 4 threads, while the Xeon E5520 has 4 cores and 8 threads. The Core i5's base clock is 1.30 GHz with a 2.60 GHz boost; the Xeon's base clock is 2.27 GHz with a 2.53 GHz boost. The Core i5 has a significantly higher boost clock relative to its base, while the Xeon runs at a consistently higher frequency across the board.

TDP is a major differentiator: 15 watts for the Core i5 versus 80 watts for the Xeon. The sockets are incompatible: Intel BGA 1168 for the Core i5, Intel Socket 1366 for the Xeon. The Core i5 uses the Haswell architecture on a 22 nm process with 1,400 million transistors and a 118 mm² die. The Xeon uses the Nehalem architecture, codenamed Gainestown, on a 45 nm process with 731 million transistors and a 263 mm² die.

Cache configurations differ in the shared L3 tier. Both have 64 KB L1 per core and 256 KB L2 per core, but the Core i5 has 3 MB of shared L3 cache while the Xeon has 8 MB. Memory support is DDR3 for both, but the Xeon adds a triple-channel memory bus and ECC support, neither of which appears for the Core i5. The Xeon also lists PCIe Gen 2 support, while the Core i5's PCIe capability is not recorded.

Integrated graphics are exclusive to the Core i5, which includes Intel HD 5000. The Xeon has none. Market segments differ: the Core i5 is a mobile part, while the Xeon is a server and workstation part. The Xeon is marked end-of-life, while the Core i5's production status is not specified. Release dates are June 2013 for the Core i5 and March 2009 for the Xeon.

Where Each One Wins

The Xeon E5520 wins in every performance category measured by the database. It is ahead in multi-threaded rendering, as shown by its Cinebench R15, R20, and R23 multicore victories. It is also ahead in single-threaded workloads, as shown by its R20 and R23 single-core wins. Its 4 cores and 8 threads, combined with higher base and boost clocks, deliver a consistent 16% advantage across all recorded tests. The Xeon is also the only one of the two with ECC memory support and a triple-channel memory bus, making it the appropriate choice for memory-sensitive server and workstation tasks.

The Core i5-4250U wins in areas not captured by the CPU benchmark suite. Its 15 watt TDP makes it the clear choice for power-constrained designs. Its integrated Intel HD 5000 graphics mean it can operate without a discrete GPU, which is a decisive advantage for compact or mobile systems. Its newer 22 nm process and higher transistor count suggest better architectural efficiency, even if that efficiency does not translate into benchmark victories in this comparison. The Core i5's 2.60 GHz boost clock is also higher than the Xeon's 2.53 GHz boost, though the Xeon's higher base clock compensates in sustained workloads.

For a builder prioritizing raw compute, the choice is the Xeon E5520. For a builder prioritizing power efficiency, integrated graphics, or a modern mobile platform, the Core i5-4250U is the only option that meets those needs. The benchmark data favors the Xeon without exception, but the specification differences show two processors designed for entirely different purposes.