Intel Core i5-1035G1 vs Intel Xeon E3-1565L v5 Comparison

Head-to-Head Benchmarks

The benchmark data shows a clear split between these two 4-core, 8-thread processors. The Intel Xeon E3-1565L v5 takes 12 of the 17 recorded tests, while the Intel Core i5-1035G1 wins 5. The margin of victory varies wildly by workload, which tells the real story.

In Cinebench, the Xeon wins every single round. The multicore results are close: R15 shows 627 vs 611 (2.6% ahead), R20 shows 2614 vs 2546 (2.7% ahead), and R23 shows 6226 vs 6062 (2.7% ahead). Single-core Cinebench is similarly tight, with the Xeon leading by 2.3% in R15 (88 vs 86), 2.8% in R20 (369 vs 359), and 2.8% in R23 (879 vs 855). These are small but consistent wins across every rendering iteration.

The PassMark suite reveals much larger gaps in specific workloads. The Xeon crushes the i5 in prime number finding by 126.3% (43 vs 19), a massive margin that reflects very different integer pipeline behavior. Physics simulation also favors the Xeon heavily: 794 vs 423, an 87.7% advantage. Random string sorting goes to the Xeon by 18% (11543 vs 9782), and data compression by 17.7% (94771 vs 80534). Extended instructions favor the Xeon by 9.2% (6031 vs 5524).

The Core i5-1035G1 fights back in math-heavy and encryption workloads. Data encryption is its biggest win: 4094 vs 2314, which puts the Xeon 43.5% behind. Integer math favors the i5 by 12.4% (26645 vs 23335), floating point math by 6% (15483 vs 14547), and single-thread PassMark by 10.4% (2198 vs 1970). The multithread PassMark score is nearly even, with the Xeon ahead by just 1.6% (7325 vs 7211).

The overall average benchmark score lands at 10320 for the Xeon and 9684 for the i5. That places the Xeon at the 66th percentile of all CPUs and the i5 at the 65th. The Xeon's nearest rivals include the Intel Xeon Gold 6338N (0.3% behind), Intel Xeon W-3175X (0.5% behind), and Intel Xeon Platinum 8280 (0.9% ahead). The i5's nearest rivals include the Intel Core i7-3770 (0.2% ahead), AMD EPYC 7402P (1.6% behind), and Intel Core i7-7700HQ (2% behind).

Architecture Differences

The Xeon E3-1565L v5 is built on Skylake-H, a 14 nm architecture with 2,300 million transistors on a 171 mm² die. It is a server/workstation part with ECC memory support, designed for reliability and sustained load. The Core i5-1035G1 uses Ice Lake-U with the Sunny Cove microarchitecture, built on Intel's 10 nm process with a 123 mm² die. It is a mobile part with a 15 W TDP, oriented toward power efficiency in thin laptops.

The Xeon has 64 KB of L1 cache per core, 256 KB of L2 per core, and 8 MB of shared L3. The i5 has 80 KB of L1 per core, 256 KB of L2 per core, and 6 MB of shared L3. The larger per-core L1 on the i5 helps explain its wins in integer and floating point math, while the larger L3 on the Xeon supports its compression and sorting advantages.

Memory support differs significantly. The Xeon supports both DDR3 and DDR4 over a dual-channel bus, with 34.1 GB/s of memory bandwidth. The i5 supports only DDR4, also dual-channel, but with 51.2 GB/s of bandwidth. Despite the i5's higher theoretical bandwidth, the Xeon still wins in most memory-sensitive tests, suggesting the Xeon's memory controller and cache hierarchy handle those workloads more efficiently.

The Xeon uses Intel BGA 1440 socket, while the i5 uses Intel BGA 1526. PCIe support is Gen 3 for both, but the Xeon specifies 16 lanes from the CPU, while the i5 lists only Gen 3 without lane count. Integrated graphics differ: the Xeon has Iris Pro Graphics P580, the i5 has UHD Graphics. The Xeon is end-of-life, released May 2016 with a launch MSRP of $417. The i5 is active production, released July 2019, and neither has an unlocked multiplier.

FAQ

Q: Which CPU is faster in Cinebench R23 multi-core?

A: The Intel Xeon E3-1565L v5 scores 6226 versus 6062 for the Core i5-1035G1, a 2.7% advantage for the Xeon.

Q: Why does the i5-1035G1 win in data encryption by such a large margin?

A: The i5 scores 4094 in PassMark data encryption versus 2314 for the Xeon, a 43.5% gap. This is likely tied to the newer Sunny Cove architecture's improved AES and cryptographic instruction handling, which the recorded data reflects.

Q: Is the Xeon E3-1565L v5 better for physics simulation?

A: Yes, by a wide margin. The Xeon scores 794 in PassMark physics versus 423 for the i5, an 87.7% difference. This workload heavily favors the Xeon's older but more power-dense design.

Q: Which chip has higher single-thread performance?

A: The Core i5-1035G1 wins in PassMark single-thread testing with 2198 versus 1970, a 10.4% edge. However, in Cinebench single-core tests, the Xeon wins by roughly 2.3% to 2.8% across R15, R20, and R23.

Q: Do both processors support ECC memory?

A: No. The Xeon E3-1565L v5 supports ECC memory, while the Core i5-1035G1 does not.

Q: What is the TDP difference?

A: The Xeon is rated at 35 W, while the i5 is rated at 15 W. The i5 uses less than half the power budget of the Xeon.

Specification Differences

| Specification | Intel Xeon E3-1565L v5 | Intel Core i5-1035G1 |

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

| Base clock | 2.50 GHz | 1000.00 MHz |

| Boost clock | 3.50 GHz | 3.60 GHz |

| TDP | 35 W | 15 W |

| Socket | Intel BGA 1440 | Intel BGA 1526 |

| Architecture | Skylake | Ice Lake |

| Codename | Skylake-H | Ice Lake-U |

| Generation | Xeon E3 (Skylake-H) | Core i5 (Sunny Cove-U) |

| Process node | 14 nm | 10 nm |

| Transistors | 2,300 million | Not listed |

| Die size | 171 mm² | 123 mm² |

| L1 cache | 64 KB per core | 80 KB per core |

| L3 cache | 8 MB shared | 6 MB shared |

| Memory support | DDR3, DDR4 | DDR4 only |

| Memory bandwidth | 34.1 GB/s | 51.2 GB/s |

| ECC memory | Yes | No |

| PCIe | Gen 3, 16 Lanes (CPU only) | Gen 3 |

| Integrated graphics | Iris Pro Graphics P580 | UHD Graphics |

| Market segment | Server/Workstation | Mobile |

| Production status | End-of-life | Active |

| Release date | May 2016 | July 2019 |

| Part number | SR2R8 | SRGKGSRGKL |

Where Each One Wins

The Xeon E3-1565L v5 wins in Cinebench across the board, all three versions, single and multi-core. It also dominates PassMark physics, prime number finding, data compression, random string sorting, extended instructions, and the multithread score. This pattern points to a CPU that handles sustained, structured workloads well: rendering, simulation, compression, and server-side tasks. Its ECC memory support and server/workstation segment make it suitable for environments where data integrity matters, such as small-scale server duty or workstation builds that need validated memory.

The Core i5-1035G1 wins in data encryption, integer math, floating point math, and PassMark single-thread. It also has a much lower TDP of 15 W versus 35 W, which makes it the clear choice for battery-powered mobile systems. Its higher memory bandwidth of 51.2 GB/s and larger per-core L1 cache suggest it handles bursty, math-heavy, and encryption-heavy tasks efficiently. The active production status means it is still available for new designs, while the Xeon is end-of-life.

The i5 also wins in raw single-thread PassMark performance by 10.4%, which matters for lightly threaded applications like web browsing, office work, and light coding. Its newer 10 nm process and Sunny Cove core bring architectural improvements that show up in integer and floating point throughput despite lower clock speed on paper.

The Verdict

The data supports a simple decision rule. If the workload is rendering, simulation, compression, or any sustained multi-threaded task where ECC memory is a requirement, the Intel Xeon E3-1565L v5 is the stronger part. It wins 12 of 17 head-to-head tests, including every Cinebench result and the dominant PassMark physics and prime number tests. Its 35 W TDP is higher but still modest for a server-class chip, and its 8 MB L3 cache gives it an edge in data-heavy workloads.

If the workload is mobile, power-constrained, or heavily weighted toward encryption and math, the Intel Core i5-1035G1 is the better fit. Its 15 W TDP is less than half the Xeon's, its single-thread PassMark score is 10.4% higher, and its data encryption score is 43.5% higher. The i5 also remains in active production, so it is available for current laptop designs, while the Xeon is end-of-life.

The average benchmark scores tell the final story: the Xeon sits at 10320, the i5 at 9684, a difference of about 6.6%. But that aggregate hides the workload-specific swings. The Xeon is the better all-around compute part, the i5 is the better efficiency and encryption part. Choose based on the job, not the average.