Intel Core i3-5020U vs Intel Xeon E5450 Comparison

The Intel Core i3-5020U and Intel Xeon E5450 sit at the same overall performance percentile, both at the 20th mark among all CPUs in the database, yet they achieve that position through completely different designs. The recorded data shows a clear winner in every single head-to-head benchmark, with the Xeon E5450 taking all five tests, but the margins are consistent and relatively narrow, ranging from roughly 14.6% to 15.4% depending on the workload. This is not a case of one chip being dramatically faster; rather, it is a steady, repeatable advantage for the older server processor across both single-core and multi-core tasks.

Head-to-Head Benchmarks

The Xeon E5450 wins every benchmark recorded in the database. In Cinebench R15 multi-core, the Xeon scores 221 against 188 for the Core i3-5020U, a delta of 14.9%. Moving to Cinebench R20 multi-core, the Xeon produces 923 points versus 787, a 14.7% lead. The single-core tests tell a similar story: in Cinebench R20 single-core, the Xeon posts 130 against 110, a 15.4% advantage, and in Cinebench R23 single-core, the Xeon reaches 310 while the Core i3-5020U manages 264, a 14.8% gap. The largest single test in the set, Cinebench R23 multi-core, sees the Xeon at 2198 compared to 1876, which translates to a 14.6% lead.

What is notable here is the consistency of the delta across all five tests. Whether the workload is single-threaded or multi-threaded, the Xeon E5450 maintains roughly the same percentage advantage, fluctuating only between 14.6% and 15.4%. This suggests the performance difference is not tied to a specific architectural strength in one area, but rather a general per-clock execution efficiency combined with a higher base clock. The Core i3-5020U has a base clock of 2.20 GHz, while the Xeon E5450 runs at 3.00 GHz, a difference that likely drives much of the observed gap. The Core i3 does have four threads via Hyper-Threading on two cores, while the Xeon has four physical cores and four threads, but that extra thread count does not close the gap in multi-core tests.

The average benchmark scores in the database reflect this near-parity in overall standing. The Core i3-5020U has an average benchmark score of 757, while the Xeon E5450 sits at 756. The nearest rivals list for the Core i3 includes the Xeon E5450 with a delta of 0.1%, meaning the Core i3 is effectively tied with the Xeon in aggregate. For the Xeon, the Core i3 appears as a rival with a delta of -0.2%, again showing a statistical dead heat. This is the central paradox: the Xeon wins every individual test by a solid margin, yet the average scores are nearly identical because the Core i3 has additional benchmark entries in the database, including Geekbench tests that the Xeon does not have recorded.

Specifically, the Core i3-5020U has Geekbench multi-core and single-core scores of 1379 and 696 respectively, while the Xeon E5450 has no Geekbench results in the database. These Geekbench numbers pull the Core i3's average up, masking the fact that in the shared Cinebench tests, the Xeon is consistently ahead. When comparing only the tests both chips have taken, the Xeon wins all five. The database's average score treats them as equals, but the head-to-head data is unambiguous.

The Verdict

The data points to the Intel Xeon E5450 as the faster processor in every measured scenario. If the choice is based purely on benchmark performance, the Xeon E5450 is the pick. It delivers a 14.6% to 15.4% advantage across all Cinebench tests, which are the only benchmarks common to both processors. The Core i3-5020U does not win a single recorded test, with a win count of zero against five for the Xeon.

However, the context matters. The Xeon E5450 is a server and workstation part from 2007, designed for socket 771 platforms, while the Core i3-5020U is a mobile processor from 2015 on BGA 1168. The Xeon draws 80 watts of thermal design power (TDP), versus 15 watts for the Core i3. That is a substantial power difference, but the database does not include any power efficiency benchmarks, so the verdict must be limited to what the measurements show. For a user who prioritizes raw compute in the recorded Cinebench workloads, the Xeon E5450 is the clear winner. For a user who needs a mobile platform, low power consumption, or integrated graphics, the Core i3-5020U has features the Xeon lacks, but those are not performance metrics.

The percentile rankings are identical at 20, meaning both chips are in the bottom fifth of all CPUs in the database. Neither is a high-performance part by modern standards. But within this specific comparison, the Xeon E5450 is faster. The data does not support any other conclusion.

Architecture Differences

The two processors come from very different eras and design philosophies. The Core i3-5020U is built on the Broadwell architecture, specifically Broadwell-U, using a 14 nm process node. It is a monolithic die of 82 mm² with 1,300 million transistors. The Xeon E5450 is based on the Core 2 architecture, codenamed Harpertown, fabricated on a 45 nm process. Its die is listed as 2x 107 mm², indicating a multi-chip module with two dies, containing a total of 820 million transistors. The process node difference is stark: 14 nm versus 45 nm, which explains the massive disparity in transistor density and power consumption.

Cache organization differs as well. The Core i3-5020U has 64 KB of L1 per core, 256 KB of L2 per core, and a shared 3 MB L3 cache. The Xeon E5450 has 64 KB of L1 per core, but its L2 is 6 MB per die, and it has no L3 cache at all. This is a fundamental architectural split: Broadwell relies on a shared L3, while Harpertown uses a large per-die L2. The Core i3's total L2 is 512 KB (256 KB per core across two cores), while the Xeon's L2 totals 12 MB across two dies, though the database lists it as 6 MB per die. That large L2 was a hallmark of the Core 2 architecture, designed to compensate for the lack of L3.

The integrated graphics also separate these parts. The Core i3-5020U includes Intel HD 5500 graphics, while the Xeon E5450 has no integrated graphics at all. This makes the Core i3 a self-contained mobile solution, whereas the Xeon requires a separate graphics card. The memory support differs: the Core i3 uses DDR3 with a dual-channel bus and a recorded memory bandwidth of 25.6 GB/s, while the Xeon supports DDR2 and DDR3 depending on the motherboard, also dual-channel, but the database records no memory bandwidth figure for it. ECC memory support is another split: the Xeon E5450 supports ECC, while the Core i3-5020U does not. The PCIe interface also differs, with the Core i3 using Gen 2 with 12 lanes (CPU only), while the Xeon uses Gen 2 with no lane count specified.

Specification Differences

The specification sheets highlight the divergent targets. The Core i3-5020U has 2 cores and 4 threads, base clock of 2.20 GHz, and no boost clock. The Xeon E5450 has 4 cores and 4 threads, base clock of 3.00 GHz, and no boost clock. The core count and clock speed both favor the Xeon, but the Core i3 compensates slightly with simultaneous multithreading. The TDP is a major difference: 15 watts for the Core i3 versus 80 watts for the Xeon, a 5.3x gap. The sockets are incompatible: BGA 1168 for the Core i3, Socket 771 for the Xeon. The market segments reflect the intended use: Mobile for the Core i3, Server/Workstation for the Xeon. Both are end-of-life and have locked multipliers.

Release dates are far apart. The Core i3-5020U launched on 2015-02-28, while the Xeon E5450 launched on 2007-11-10, a gap of over seven years. The launch MSRP values are recorded in the database: the Core i3-5020U had a launch MSRP of $281, and the Xeon E5450 had a launch MSRP of $915. The part numbers are SR240 for the Core i3 and SLANQSLBBM for the Xeon. The process node, as noted, is 14 nm versus 45 nm. The transistor count and die size are also recorded as different. The Core i3 has no ECC support, while the Xeon has ECC support. The Core i3 has integrated graphics, the Xeon does not.

FAQ

Q: Which processor wins in multi-core performance?

A: The Intel Xeon E5450 wins all multi-core tests. In Cinebench R15 multi-core, the Xeon scores 221 versus 188 for the Core i3-5020U, a 14.9% lead. In Cinebench R20 multi-core, the Xeon scores 923 versus 787, a 14.7% lead, and in Cinebench R23 multi-core, the Xeon scores 2198 versus 1876, a 14.6% lead.

Q: Which processor wins in single-core performance?

A: The Intel Xeon E5450 also wins single-core tests. In Cinebench R20 single-core, the Xeon scores 130 versus 110, a 15.4% advantage. In Cinebench R23 single-core, the Xeon scores 310 versus 264, a 14.8% advantage.

Q: How do the average benchmark scores compare?

A: The average benchmark scores are nearly identical. The Core i3-5020U has an average score of 757, while the Xeon E5450 has an average score of 756. The nearest rivals data shows a delta of 0.1% between them, making them statistically tied in aggregate.

Q: Why are the average scores so close if the Xeon wins every head-to-head test?

A: The Core i3-5020U has additional benchmark results in the database that the Xeon E5450 does not have, specifically Geekbench multi-core (1379) and single-core (696) scores. These extra scores raise the Core i3's average, offsetting its losses in the Cinebench tests.

Q: Does the Core i3-5020U have any performance advantage?

A: In the recorded head-to-head benchmarks, the Core i3-5020U does not win any test. It has 0 wins against 5 for the Xeon E5450. However, it does have integrated graphics (Intel HD 5500) and a much lower TDP of 15 watts, but those are not reflected in the benchmark scores.

Q: What is the difference in core and thread counts?

A: The Core i3-5020U has 2 cores and 4 threads, while the Xeon E5450 has 4 cores and 4 threads. The Xeon also has a higher base clock of 3.00 GHz compared to 2.20 GHz for the Core i3.

Where Each One Wins

The Intel Xeon E5450 wins every benchmark category where both processors have data. In multi-core Cinebench tests, it leads by 14.6% to 14.9%, and in single-core tests, it leads by 14.8% to 15.4%. This makes it the superior choice for any compute-heavy workload that resembles these Cinebench rendering tasks, such as video encoding, 3D rendering, or scientific computation. The Xeon also offers ECC memory support, which is critical for server reliability, and it has four physical cores, which can be advantageous in workloads that scale with physical core count rather than threads.

The Intel Core i3-5020U does not win any recorded benchmark, but it has advantages outside the performance metrics. Its 15 watt TDP is drastically lower than the Xeon's 80 watts, making it suitable for laptops and other power-constrained mobile devices. It includes integrated Intel HD 5500 graphics, eliminating the need for a discrete GPU in basic display tasks. It supports DDR3 memory with a recorded bandwidth of 25.6 GB/s, and it uses a modern 14 nm process node, which contributes to its efficiency. The Core i3 also benefits from a later release date, meaning it is compatible with more modern platform features, though the database does not specify what those are beyond the listed specifications.

For a user building a desktop workstation or server from older parts, the Xeon E5450 is the clear winner based on the data. For a user seeking a mobile processor with low power draw and integrated graphics, the Core i3-5020U is the only option that fits, despite its benchmark losses. The database does not record any power efficiency or thermal performance metrics, so the verdict on those fronts is qualitative, but the TDP figures speak to the intended use cases. In short, the Xeon wins on raw performance, the Core i3 wins on mobility and efficiency, and the benchmark data supports only the former directly.