Intel Core i5-5250U vs Intel Xeon W3520 Comparison

The Intel Xeon W3520 and the Intel Core i5-5250U represent two vastly different design philosophies from Intel, separated by six years of process technology evolution but occupying the same performance percentile. The data shows a clear overall victor in raw compute: the Xeon W3520 wins all five head-to-head Cinebench tests, with a consistent performance advantage of approximately 20.5% across multi-core and single-core workloads. However, the i5-5250U, despite its lower absolute scores, delivers this performance at a fraction of the power envelope and includes modern features like integrated graphics. This comparison is not about which is faster—the Xeon is definitively faster—but about which architectural trade-offs are more relevant for a given use case.

The Verdict

From a pure benchmark score perspective, the Intel Xeon W3520 is the superior processor. Its average benchmark score of 862 places it just above the i5-5250U's 856, and its nearest rival is the Intel Xeon X3460, which it trails by only 0.5%. The i5-5250U's closest competitor is the Intel Core i5-2500T, with a 0% delta, indicating they are statistically tied. The Xeon's wins are not marginal; in Cinebench R23 multi-core, it scores 2505 versus 2079 for the i5-5250U, a 20.5% lead. This consistent margin across all tests indicates a fundamental performance advantage in CPU-bound tasks.

The Xeon W3520 is the choice for anyone who needs maximum multi-threaded throughput in a stationary system. Its 4 cores and 8 threads, combined with an 8 MB shared L3 cache, provide a significant edge in rendering and heavy computational workloads. The i5-5250U, conversely, is designed for mobility and efficiency. Its 2 cores and 4 threads are sufficient for everyday tasks, but the data shows it simply cannot keep pace with the older Xeon in sustained compute. The i5-5250U's sole advantage lies in its 15W TDP and integrated Intel HD 6000 graphics, making it the only viable option for fanless or ultra-portable designs. A user choosing between these two should base the decision entirely on the need for mobility versus the need for raw processing power.

Architecture Differences

The architectural gap between these two processors is substantial. The Xeon W3520 is built on the Nehalem architecture with a 45 nm process node, featuring 731 million transistors on a 263 mm² die. The i5-5250U uses the much newer Broadwell architecture on a 14 nm node, packing 1,900 million transistors into a smaller 133 mm² die. This process advantage is the primary reason the i5-5250U can achieve a 15W TDP while the Xeon draws 130W.

Core configuration differs significantly. The Xeon offers 4 cores and 8 threads, while the i5-5250U is limited to 2 cores and 4 threads. Cache hierarchies are also distinct. Both share 64 KB of L1 and 256 KB of L2 per core, but the Xeon has a large 8 MB shared L3 cache versus the i5's 3 MB shared L3. Memory support shows the Xeon's workstation pedigree: it supports triple-channel DDR3 with ECC memory, whereas the i5-5250U uses dual-channel DDR3 without ECC. The i5-5250U does have a specified memory bandwidth of 29.9 GB/s, a figure not provided for the Xeon.

The market segments are fundamentally different. The Xeon is a server/workstation part for Intel Socket 1366, while the i5-5250U is a mobile chip for Intel BGA 1168. The i5-5250U includes integrated Intel HD 6000 graphics, a feature entirely absent from the Xeon. Both support PCIe Gen 2, though the i5's implementation is limited to 12 lanes from the CPU. The Xeon was released in March 2009, while the i5-5250U launched in February 2015. Both are end-of-life products, and neither has an unlocked multiplier.

Head-to-Head Benchmarks

The benchmark data presents a remarkably uniform picture. The Xeon W3520 wins all five Cinebench tests, and the margin is almost identical across all of them. In Cinebench R15 multi-core, the Xeon scores 252 against the i5's 209, a 20.6% advantage. This pattern repeats in Cinebench R20 multi-core (1052 vs 873, 20.5% delta) and Cinebench R23 multi-core (2505 vs 2079, 20.5% delta).

Single-core performance tells the same story. The Xeon leads in Cinebench R20 single-core with 148 versus 123, a 20.3% delta. In Cinebench R23 single-core, the Xeon scores 353 against the i5's 293, again a 20.5% advantage. This consistency is notable because single-core tests typically favor newer architectures with higher instructions per clock. The fact that the older 45 nm Xeon still outperforms the 14 nm i5 by the same margin in single-threaded tests suggests that the Xeon's higher base clock of 2.67 GHz and boost clock of 2.93 GHz provide a decisive advantage over the i5's 1.60 GHz base clock, even with its 2.70 GHz boost.

The i5-5250U does have benchmark entries the Xeon lacks, including Geekbench multi-core (1587) and single-core (825) scores, but no direct comparison is available. The data shows the Xeon with a 100% win rate in the head-to-head tests, with 5 wins and 0 losses. The percentile rankings are identical at 23% for both, placing them in the same overall performance tier despite the Xeon's consistent per-test wins.

FAQ

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

A: The Intel Xeon W3520 is consistently faster. In Cinebench R23 multi-core, it scores 2505 versus the i5-5250U's 2079, a 20.5% advantage. The Xeon also wins Cinebench R15 multi-core (252 vs 209) and Cinebench R20 multi-core (1052 vs 873) by similar margins.

Q: Does the newer i5-5250U have better single-core performance?

A: No. Despite being built on a newer 14 nm Broadwell architecture, the i5-5250U loses in single-core tests. In Cinebench R23 single-core, the Xeon scores 353 versus 293, a 20.5% lead. The Xeon also wins Cinebench R20 single-core (148 vs 123).

Q: What is the power consumption difference?

A: The Xeon W3520 has a TDP of 130W, while the i5-5250U has a TDP of just 15W. This is an 115W difference, reflecting the Xeon's workstation design and the i5's mobile focus.

Q: Does the i5-5250U have any features the Xeon lacks?

A: Yes, the i5-5250U includes integrated Intel HD 6000 graphics. The Xeon has no integrated graphics. The i5 also has a specified memory bandwidth of 29.9 GB/s, a figure not provided for the Xeon.

Q: Which processor supports ECC memory?

A: The Intel Xeon W3520 supports ECC memory. The Intel Core i5-5250U does not support ECC.

Q: How do these processors compare to their nearest rivals?

A: The Xeon W3520 has an average benchmark score of 862, placing it 0.1% ahead of the Intel Core i5-3470T and 0.2% ahead of the AMD A8-7650K. The i5-5250U scores 856, which is exactly tied with the Intel Core i5-2500T and 0.4% behind the Intel Core i7-4500U.

Where Each One Wins

The Xeon W3520 wins in every measurable CPU benchmark category. Its 20.5% lead in Cinebench R23 multi-core (2505 vs 2079) makes it the clear choice for rendering, video encoding, and any workload that scales with threads. The consistent single-core advantage (353 vs 293 in R23) also makes it better for lightly-threaded applications that rely on raw clock speed. The Xeon's ECC memory support and triple-channel memory bus position it for workstation reliability and memory bandwidth-sensitive tasks, though no specific bandwidth figure is provided in the data.

The i5-5250U's wins are not in performance but in form factor and efficiency. Its 15W TDP (versus 130W for the Xeon) allows for passive cooling and slim laptop designs that the Xeon cannot physically fit into. The integrated Intel HD 6000 graphics eliminate the need for a discrete GPU in basic systems, a capability the Xeon completely lacks. The i5-5250U's launch MSRP is $315, a figure not available for the Xeon, though pricing comparisons are not applicable here. For mobile users, the i5's 2.70 GHz boost clock provides adequate responsiveness for everyday computing, but the data confirms it is not a performance part. The i5-5250U wins in the context of ultra-portable systems where power draw and integrated graphics are paramount, while the Xeon wins everywhere raw compute is the priority.