Intel Core i5-8279U vs Intel Xeon E3-1285L v4 Comparison

The Intel Xeon E3-1285L v4 and the Intel Core i5-8279U are both 14nm quad-core parts, but they target entirely different segments of the PC market. The Xeon is a server/workstation chip for Socket 1150, while the i5 is a mobile processor for BGA 1526. Benchmark results from the database show a consistent, though not overwhelming, performance edge for the Xeon across every Cinebench test, despite the i5 having a higher boost clock. The data paints a clear picture: the older server part is the faster compute engine, but the mobile chip counters with a much lower TDP and newer platform features.

Head-to-Head Benchmarks

The head-to-head results are one-sided. The Xeon E3-1285L v4 wins all six Cinebench comparisons, with a lead that hovers tightly between 9.0% and 9.4%. In the multi-core Cinebench R23 test, the Xeon scores 6884 against the i5-8279U’s 6294, a 9.4% advantage. The single-core R23 result is similar: 971 versus 888, again a 9.3% delta in favor of the Xeon. This pattern is remarkably consistent across all three Cinebench versions, suggesting a fundamental throughput advantage rather than workload-specific luck.

Looking at the R15 tests, the Xeon posts 693 multi-core and 97 single-core, while the i5 manages 634 and 89, respectively. The deltas are 9.3% and 9.0% — the narrowest gap in the entire comparison. In R20, the Xeon’s 2891 multi-core and 407 single-core scores beat the i5’s 2643 and 372, with both deltas at 9.4%. When compared to the broader market, both CPUs sit at the 44th percentile among all CPUs, and their average benchmark scores are nearly identical: 1991 for the Xeon versus 1987 for the i5. The Xeon’s nearest rival by average score is the AMD Ryzen 5 1500X at 1992 (0% delta), while the i5 sits just behind the Intel Xeon E3-1585L v5 at 1989 (-0.1%). In direct comparison, the i5-8279U trails the Xeon by 0.2% in average score.

What is striking is that the i5’s higher boost clock of 4.10 GHz does not translate into a single-core win. The Xeon’s 3.80 GHz boost is enough to keep it ahead, indicating that architectural efficiency and sustained power delivery matter more than peak frequency alone. The i5’s lead in average score over its own rival, the AMD Ryzen Embedded V1756B (1986, 0.1% delta), is razor-thin, confirming that this mobile part is competitive within its class despite losing to the Xeon.

Where Each One Wins

The Xeon E3-1285L v4 is the clear winner for raw compute throughput. Its 9.4% lead in Cinebench R23 multi-core (6884 vs 6294) makes it the better choice for sustained multi-threaded workloads like video rendering, 3D modeling, or batch compilation. The single-core wins in R23 (971 vs 888) and R20 (407 vs 372) also signal an advantage in lightly-threaded tasks such as spreadsheet calculations or web serving. This is a server-class chip; its 65W TDP and ECC memory support align with always-on workstation duties where performance per watt is secondary to raw output.

The i5-8279U has no benchmark wins in this comparison, but it wins in platform suitability. Its 28W TDP is less than half the Xeon’s 65W, making it viable for compact laptops and all-in-one systems where cooling is constrained. It supports DDR4 memory with a higher bandwidth of 34.1 GB/s versus the Xeon’s DDR3 at 29.9 GB/s, which can benefit memory-sensitive applications. The i5 also has a newer integrated GPU, the Iris Pro Plus 655, versus the Xeon’s Iris Pro P6300 — a difference that matters for media playback or light gaming in a mobile chassis, though the data does not quantify GPU performance. For a mobile user who needs a fast quad-core for occasional bursts of work, the i5’s lower power draw is the defining practical advantage.

Architecture Differences

Both chips are built on Intel’s 14 nm process, but they come from different generations and design philosophies. The Xeon E3-1285L v4 is Broadwell-DT, a server-oriented design from 2015 with a die size of 160 mm² and 1,400 million transistors. The i5-8279U is Coffee Lake-U, a mobile part from 2019 with a smaller die of 126 mm² but a higher transistor count of 2,300 million. This suggests the Coffee Lake design packs more logic into a smaller area, likely for improved power efficiency and integrated features.

The core configuration is identical: 4 cores, 8 threads, 64 KB L1 per core, 256 KB L2 per core, and 6 MB shared L3. The differences lie elsewhere. The Xeon supports ECC memory, a hallmark of server reliability, while the i5 does not. The Xeon uses DDR3 on a dual-channel bus; the i5 uses DDR4 with a wider 34.1 GB/s bandwidth. PCIe support is Gen 3 for both, but the i5 explicitly lists 16 lanes (CPU only), while the Xeon’s specification is simply “Gen 3.” The Xeon’s base clock is 3.40 GHz versus the i5’s 2.40 GHz, but the i5 boosts higher at 4.10 GHz versus 3.80 GHz.

The sockets are incompatible: the Xeon uses Intel Socket 1150, the i5 uses BGA 1526. This is a critical differentiator — the Xeon is a socketed, upgradeable server part, while the i5 is soldered to the motherboard. The Xeon’s market segment is Server/Workstation; the i5’s is Mobile. Both are end-of-life, but the Xeon launched in June 2015, while the i5 arrived in April 2019. The i5 also includes a Geekbench score (3764 multi-core, 1209 single-core) in the database, which the Xeon lacks, though this does not affect the direct comparison.

FAQ

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

A: The Intel Xeon E3-1285L v4 is faster. In Cinebench R23 multi-core, it scores 6884 versus the i5-8279U’s 6294, a 9.4% advantage. The same pattern holds in R20 (2891 vs 2643) and R15 (693 vs 634).

Q: Does the i5-8279U’s higher boost clock help it win any benchmarks?

A: No. Despite a 4.10 GHz boost versus the Xeon’s 3.80 GHz, the i5 loses every single-core test. In Cinebench R23 single-core, the Xeon scores 971 against the i5’s 888, a 9.3% gap.

Q: Are these CPUs compatible with the same motherboard?

A: No. The Xeon E3-1285L v4 uses Intel Socket 1150, while the i5-8279U uses BGA 1526. The i5 is a mobile chip soldered to the board, so it is not upgradeable.

Q: Which chip supports ECC memory?

A: Only the Xeon E3-1285L v4 supports ECC memory. The i5-8279U does not, which makes the Xeon the choice for error-correcting workstation builds.

Q: How do these compare to their nearest rivals?

A: The Xeon’s average score of 1991 is matched by the AMD Ryzen 5 1500X at 1992 (0% delta). The i5’s 1987 average is just ahead of the Intel Xeon E3-1585L v5 at 1989 (-0.1%) and the AMD Ryzen Embedded V1756B at 1986 (0.1%).

Q: What is the power draw difference?

A: The Xeon E3-1285L v4 has a 65W TDP, while the i5-8279U is rated at 28W. This makes the i5 far better suited for thermally constrained laptops.

The Verdict

Pick the Intel Xeon E3-1285L v4 if you need a socketed, ECC-capable processor for a workstation or server and are willing to accept a 65W TDP and DDR3 memory. The data shows it is 9.4% faster in multi-core Cinebench R23 and 9.3% faster in single-core R23, making it the superior compute engine in every measured metric. Its 6 MB shared L3, 3.80 GHz boost, and 14 nm design are enough to hold off the newer mobile chip.

Pick the Intel Core i5-8279U if your priority is a low-power, mobile platform. It loses every benchmark by roughly 9%, but it consumes only 28W, supports DDR4 with higher bandwidth (34.1 GB/s vs 29.9 GB/s), and integrates a newer GPU. For a laptop user who needs occasional quad-core performance without a power brick, the i5 is the practical choice. The Xeon is faster; the i5 is more portable. There is no middle ground without a socket adapter, which the data does not support.

Specification Differences

| Specification | Intel Xeon E3-1285L v4 | Intel Core i5-8279U |

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

| Base Clock | 3.40 GHz | 2.40 GHz |

| Boost Clock | 3.80 GHz | 4.10 GHz |

| TDP | 65 W | 28 W |

| Socket | Intel Socket 1150 | Intel BGA 1526 |

| Architecture | Broadwell | Coffee Lake |

| Process Node | 14 nm | 14 nm |

| Transistors | 1,400 million | 2,300 million |

| Die Size | 160 mm² | 126 mm² |

| Memory Support | DDR3 | DDR4 |

| Memory Bandwidth | 29.9 GB/s | 34.1 GB/s |

| ECC Memory | Yes | No |

| Integrated Graphics | Intel Iris Pro P6300 | Iris Pro Plus 655 |

| Market Segment | Server/Workstation | Mobile |

| Release Date | 2015-06-01 | 2019-04-02 |

| Launch MSRP | $445 | $320 |