Intel Core i5-5300U vs Intel Xeon X5550 Comparison

The Intel Core i5-5300U and Intel Xeon X5550 represent two very different philosophies from Intel’s lineup: a late-generation, low-power mobile chip against an early-era, high-core-count server part. The data shows a decisive sweep in head-to-head testing, but the margins tell a more nuanced story about where each processor’s strengths actually lie. The Xeon wins every benchmark, yet the per-core distances are remarkably consistent, hinting that the two chips are closer in raw capability per thread than their ages suggest.

Head-to-Head Benchmarks

The Xeon X5550 takes all five head-to-head benchmarks, but none by a dramatic margin. In Cinebench R15 multi-core, the Xeon scores 259 against the i5-5300U’s 230, a delta of -11.2% from the i5’s perspective. That pattern repeats almost identically in Cinebench R20 multi-core, where the Xeon posts 1083 versus 960, again an 11.4% gap. The single-core results are equally telling: the Xeon wins Cinebench R20 single-core with 152 points over 135, and Cinebench R23 single-core with 364 over 322, deltas of -11.2% and -11.5% respectively.

The largest relative gap appears in the newest test, Cinebench R23 multi-core, where the Xeon’s 2580 outpaces the i5’s 2287 by 11.4%. Interestingly, the smallest absolute difference is in Cinebench R15 multi-core, where only 29 points separate the two. What this data implies is that the Xeon’s advantage is consistent across both threaded and single-threaded workloads, rather than being driven by its extra cores. If the Xeon were winning purely on core count, the multi-core deltas would be much larger than the single-core ones — but they are nearly identical. This suggests the Xeon’s architectural edge per clock, or its higher base and boost clocks, is doing most of the work.

The i5-5300U does not secure a single win. Its best showing is in Cinebench R15 multi-core, where it trails by only 11.2%. The data shows no scenario where the mobile chip closes the gap, which is surprising given its much newer 14 nm process. The 11-12% deficit appears to be a hard ceiling for the i5 across all tested workloads.

Architecture Differences

The two processors are separated by six years of Intel design philosophy, and the architectural contrasts are stark. The i5-5300U is built on Broadwell-U, a 14 nm node with 1,300 million transistors packed into an 82 mm² die. The Xeon X5550 uses the older Nehalem architecture (codename Gainestown), fabricated on 45 nm with 731 million transistors spread across a much larger 263 mm² die. The transistor density difference is enormous: the i5 crams nearly twice as many transistors into less than a third of the silicon area.

Core counts differ as expected: the i5 offers 2 cores and 4 threads, while the Xeon doubles that to 4 cores and 8 threads. Cache hierarchies also diverge significantly. Both share 64 KB L1 and 256 KB L2 per core, but the Xeon’s L3 cache is 8 MB shared versus the i5’s 3 MB shared — a 5 MB advantage for the server chip. Clock speeds favor the Xeon as well: it runs at 2.67 GHz base and boosts to 3.07 GHz, while the i5 sits at 2.30 GHz base and 2.90 GHz boost.

Memory support reveals a key server-oriented feature. Both use DDR3, but the Xeon supports triple-channel memory and ECC, while the i5 is dual-channel and lacks ECC. The i5 does have a listed memory bandwidth of 25.6 GB/s, whereas the Xeon’s bandwidth is not specified in the data. The i5 also includes Intel HD 5500 integrated graphics, which the Xeon entirely lacks. The i5 uses PCIe Gen 2 with 12 lanes (CPU only), while the Xeon lists PCIe Gen 2 without a lane count. Power envelopes are worlds apart: the i5 is rated at 15W TDP, the Xeon at 95W — a 6.3x difference that explains the i5’s mobile market segment versus the Xeon’s server/workstation designation.

Where Each One Wins

The Xeon X5550 wins everywhere in the benchmark suite, but the nature of those wins suggests specific use cases. For multi-threaded rendering or heavy parallel computation, the Xeon’s 4-core/8-thread configuration provides a genuine advantage, even if the per-core performance is only modestly better. The Cinebench R23 multi-core score of 2580 versus 2287 shows the Xeon handles sustained multi-threaded loads with about 11% more throughput. For single-threaded tasks, the Xeon also leads, as seen in Cinebench R23 single-core (364 vs 322), meaning it is not merely a multi-core brute — it is also faster on lightly threaded workloads.

The i5-5300U’s wins are not in raw performance but in efficiency and integration. Its 15W TDP versus the Xeon’s 95W means it can operate in fanless or ultra-portable designs where the Xeon would require substantial cooling. The integrated Intel HD 5500 graphics gives the i5 a complete package for basic display output, something the Xeon cannot offer without a discrete GPU. The i5’s newer 14 nm process and smaller die (82 mm² vs 263 mm²) suggest lower manufacturing costs and better thermal characteristics, though the benchmark data does not quantify these advantages directly.

For a user constrained by power or space, the i5 is the clear choice — but the data shows no performance scenario where it outruns the Xeon. The Xeon’s ECC memory support is a server-specific win, enabling error-correcting memory that the i5 cannot use.

FAQ

Q: Which processor has higher single-core performance?

A: The Intel Xeon X5550 wins all single-core tests. In Cinebench R20 single-core, it scores 152 against the i5-5300U’s 135, a delta of -11.2%. In Cinebench R23 single-core, the Xeon scores 364 versus 322, a -11.5% gap.

Q: How does the multi-core performance compare?

A: The Xeon X5550 leads in every multi-core test. Cinebench R15 shows 259 versus 230 (-11.2%), Cinebench R20 shows 1083 versus 960 (-11.4%), and Cinebench R23 shows 2580 versus 2287 (-11.4%). The Xeon’s 4 cores and 8 threads provide a consistent edge over the i5’s 2 cores and 4 threads.

Q: Does the i5-5300U have integrated graphics?

A: Yes, the i5-5300U includes Intel HD 5500 integrated graphics. The Intel Xeon X5550 has no integrated graphics, requiring a separate GPU for display output.

Q: Which processor supports ECC memory?

A: The Intel Xeon X5550 supports ECC memory, while the Intel Core i5-5300U does not. This makes the Xeon suitable for error-sensitive server workloads.

Q: What are the power consumption differences?

A: The i5-5300U is rated at 15W TDP, while the Xeon X5550 is rated at 95W TDP. This is a 6.3x difference, reflecting the i5’s mobile design and the Xeon’s server-class power envelope.

Q: How do their average benchmark scores compare?

A: The i5-5300U has an average benchmark score of 895, while the Xeon X5550’s average is 888. Despite the Xeon winning every head-to-head test, its average score is slightly lower due to the different benchmark weighting.

Specification Differences

| Specification | Intel Core i5-5300U | Intel Xeon X5550 |

|---|---|---|

| Cores | 2 | 4 |

| Threads | 4 | 8 |

| Base Clock | 2.30 GHz | 2.67 GHz |

| Boost Clock | 2.90 GHz | 3.07 GHz |

| TDP | 15 W | 95 W |

| Socket | Intel BGA 1168 | Intel Socket 1366 |

| Architecture | Broadwell | Nehalem |

| Codename | Broadwell-U | Gainestown |

| Process Node | 14 nm | 45 nm |

| Transistors | 1,300 million | 731 million |

| Die Size | 82 mm² | 263 mm² |

| L3 Cache | 3 MB (shared) | 8 MB (shared) |

| Memory Bus | Dual-channel | Triple-channel |

| ECC Memory | No | Yes |

| PCIe | Gen 2, 12 Lanes (CPU only) | Gen 2 |

| Integrated Graphics | Intel HD 5500 | None |

| Market Segment | Mobile | Server/Workstation |

| Release Date | 2015-02-28 | 2009-03-29 |

| Launch MSRP | $315 | Not specified |

| Part Number | SR23X | SLBF5 |

The Verdict

The benchmark data is unambiguous: the Intel Xeon X5550 outperforms the Intel Core i5-5300U in every tested scenario. The Xeon’s consistent 11-12% lead across both single-core and multi-core workloads indicates a fundamental per-thread advantage, not merely a core-count benefit. For anyone prioritizing raw processing power — whether for rendering, compilation, or server duties — the Xeon is the data-backed choice. Its 4 cores, 8 threads, larger 8 MB L3 cache, and higher clock speeds deliver measurable wins in Cinebench R15, R20, and R23.

However, the i5-5300U is not without its own rationale. The 15W TDP versus the Xeon’s 95W makes it the only option for battery-powered or thermally constrained environments. The inclusion of Intel HD 5500 graphics means a complete system can be built without a discrete GPU, something impossible with the Xeon. The i5’s newer 14 nm process and smaller die also imply greater energy efficiency per transistor, though the benchmarks do not capture thermal or power efficiency directly.

The Xeon’s ECC memory support and triple-channel memory bus make it the superior choice for data integrity and memory bandwidth in server workloads. Its older 45 nm node and larger die (263 mm²) are drawbacks for power and cost, but the performance data shows no penalty in practice. The i5’s average benchmark score of 895 is actually slightly higher than the Xeon’s 888, a quirk of the averaging methodology, but head-to-head results override that aggregate metric. For a user who needs the fastest possible Cinebench scores, the Xeon wins outright. For a user who needs a low-power, graphics-integrated mobile processor, the i5 is the only viable option — and it loses every performance comparison by a narrow, consistent margin.