Intel Core i5-5300U vs Intel Xeon W3540 Comparison

Head-to-Head Benchmarks

The recorded Cinebench results show a consistent advantage for the Intel Xeon W3540 across every workload tested. In Cinebench R15 multicore, the Xeon scores 267 against 230 for the Core i5-5300U, a 16.1% margin. The R20 multicore test shows a similar pattern: 1113 versus 960, a 15.9% gap. The R23 multicore run has the Xeon at 2652 and the i5 at 2287, a 16% difference. These results align with the core count advantage, as the Xeon has twice the physical cores and twice the threads.

Single-core performance also favors the older Xeon, which is notable given the six-year gap in release dates. In Cinebench R20 single-core, the Xeon scores 157 against 135, a 16.3% lead. The R23 single-core test records 374 versus 322, a 16.1% margin. The Xeon wins all five head-to-head benchmarks in the database, with no test favoring the mobile i5. The narrowest margin is 15.9% in R20 multicore, while the widest is 16.3% in R20 single-core.

Average benchmark scores place the two processors close together overall. The Xeon W3540 has an average score of 913, while the i5-5300U averages 895. The Xeon sits among rivals like the Intel Pentium Gold G6405T at 915 (0.2% ahead of the Xeon) and the AMD Athlon Silver 3050U at 917 (0.5% ahead). The i5-5300U matches the Intel Pentium G4600T exactly at 895 and sits just behind the AMD Ryzen 3 3200U at 893 and the Intel Core i3-6100 at 888. Both CPUs occupy the 24th percentile among all processors in the database, meaning they deliver similar overall performance despite their architectural differences.

Architecture Differences

The two chips come from different design eras and target different market segments. The Xeon W3540 uses the Nehalem architecture on the Bloomfield codename, built on a 45 nm process at Intel with 731 million transistors on a 263 mm² die. It is a server and workstation part on Socket 1366. The Core i5-5300U uses the Broadwell architecture on the Broadwell-U codename, built on a 14 nm process with 1,300 million transistors on a much smaller 82 mm² die. It is a mobile part on BGA 1168.

Core counts differ sharply. The Xeon has 4 cores and 8 threads, while the i5 has 2 cores and 4 threads. Both share the same per-core L1 cache at 64 KB and per-core L2 cache at 256 KB, but the shared L3 cache differs: the Xeon has 8 MB shared, while the i5 has only 3 MB shared. The Xeon runs at a base clock of 2.93 GHz with a boost of 3.20 GHz. The i5 has a lower base of 2.30 GHz and a boost of 2.90 GHz.

Memory support also diverges. The Xeon uses triple-channel DDR3 and supports ECC memory, matching its workstation positioning. The i5 uses dual-channel DDR3 with a recorded memory bandwidth of 25.6 GB/s and no ECC support. Both use PCIe Gen 2, though the i5 lists 12 lanes from the CPU only. The i5 includes integrated graphics (Intel HD 5500), while the Xeon has none listed. Power envelopes are dramatically different: the Xeon has a 130 W TDP, the i5 only 15 W, reflecting the mobile focus of the latter.

The Xeon was released in March 2009, the i5 in February 2015. Both are end-of-life products. Neither has an unlocked multiplier. The i5 carries a launch MSRP of $315; the Xeon has no recorded launch MSRP. The Xeon part number is SLBEX, the i5 is SR23X.

Where Each One Wins

The Xeon W3540 wins every benchmark in the head-to-head set, so the use-case split is driven by which workload is being considered rather than which processor can claim a victory. In multicore rendering tasks, the Xeon's 4-core, 8-thread configuration delivers 15.9% to 16.1% more performance than the i5 across R15, R20, and R23. The 8 MB shared L3 cache and triple-channel memory support likely contribute to this sustained advantage in threaded workloads.

Single-core performance also goes to the Xeon by 16.1% to 16.3%, which is more surprising given the i5's newer architecture and higher transistor count. This means even lightly threaded applications, such as older software or single-threaded productivity tools, would favor the Xeon in the recorded tests.

The i5-5300U does not win any recorded benchmark, but its advantage lies outside the Cinebench suite. It has integrated graphics, a 15 W TDP against 130 W, and a much smaller die (82 mm² versus 263 mm²). For mobile or low-power systems, the i5 is the only practical choice, since the Xeon requires a Socket 1366 workstation board and a substantial cooling solution. The i5 also has a newer process node (14 nm versus 45 nm), which typically brings efficiency improvements, though the database does not include power efficiency benchmarks.

For users focused purely on the recorded Cinebench results, the Xeon is the stronger performer in every test. For users who need a compact, low-power system with integrated graphics, the i5 is the only option that fits those constraints.

FAQ

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

A: The Intel Xeon W3540 wins all multicore tests. It scores 267 versus 230 in Cinebench R15 (16.1% ahead), 1113 versus 960 in R20 (15.9% ahead), and 2652 versus 2287 in R23 (16% ahead).

Q: Does the newer Core i5-5300U win any benchmark?

A: No. The database records five head-to-head benchmarks, and the Xeon W3540 wins all five, including single-core tests where the i5 might be expected to compete given its newer architecture.

Q: What is the core and thread difference?

A: The Xeon W3540 has 4 cores and 8 threads. The Core i5-5300U has 2 cores and 4 threads. Both have 64 KB L1 and 256 KB L2 per core, but the Xeon has 8 MB shared L3 versus 3 MB shared L3.

Q: Do both processors support ECC memory?

A: No. The Xeon W3540 supports ECC memory, which fits its server and workstation segment. The Core i5-5300U does not support ECC.

Q: How do their average benchmark scores compare?

A: The Xeon W3540 averages 913 points, and the Core i5-5300U averages 895 points. Both sit at the 24th percentile among all CPUs in the database.

Q: Which processor has integrated graphics?

A: The Core i5-5300U includes Intel HD 5500 integrated graphics. The Xeon W3540 has no integrated graphics listed in the database.

The Verdict

The data points to a clear performance winner: the Intel Xeon W3540 beats the Core i5-5300U in every recorded benchmark, with margins between 15.9% and 16.3%. This holds for both single-core and multi-core tests, suggesting the Xeon's higher clock speeds, larger L3 cache, and additional cores provide a consistent advantage in the Cinebench suite. The Xeon also supports ECC memory and triple-channel DDR3, making it the more capable platform for workstation-class tasks.

The Core i5-5300U is not competitive on raw performance in these tests, but it serves a different purpose. Its 15 W TDP, integrated graphics, and compact BGA 1168 package make it suitable for laptops and low-power systems where the Xeon's 130 W TDP and Socket 1366 requirement are prohibitive. The i5 also uses a 14 nm process with 1,300 million transistors on an 82 mm² die, versus the Xeon's 45 nm process with 731 million transistors on a 263 mm² die, indicating a much more efficient design per watt.

Buyers who need maximum rendering performance from the recorded benchmarks and can accommodate a workstation platform should choose the Xeon W3540. Buyers who need a low-power mobile processor with integrated graphics, or who cannot use a Socket 1366 board, should choose the Core i5-5300U. The choice depends entirely on platform constraints and power requirements, not on benchmark performance, since the Xeon dominates the latter.

Specification Differences

| Specification | Intel Xeon W3540 | Intel Core i5-5300U |

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

| Cores | 4 | 2 |

| Threads | 8 | 4 |

| Base Clock | 2.93 GHz | 2.30 GHz |

| Boost Clock | 3.20 GHz | 2.90 GHz |

| TDP | 130 W | 15 W |

| Socket | Intel Socket 1366 | Intel BGA 1168 |

| Architecture | Nehalem | Broadwell |

| Codename | Bloomfield | Broadwell-U |

| Process Node | 45 nm | 14 nm |

| Transistors | 731 million | 1,300 million |

| Die Size | 263 mm² | 82 mm² |

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

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

| Memory Bandwidth | Not recorded | 25.6 GB/s |

| ECC Memory | Yes | No |

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

| Integrated Graphics | None | Intel HD 5500 |

| Market Segment | Server/Workstation | Mobile |

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

| Launch MSRP | Not recorded | $315 |

| Part Number | SLBEX | SR23X |

| Average Benchmark Score | 913 | 895 |

| Percentile vs All CPUs | 24 | 24 |