Intel Core i7-3770 vs Intel Xeon E3-1565L v5 Comparison

This is a matchup between two very different eras of Intel silicon. The Xeon E3-1565L v5 is a low-power, server-oriented Skylake part from 2016, while the Core i7-3770 is a desktop Ivy Bridge chip from 2012. Despite the generational gap, both CPUs share a 4-core/8-thread configuration and an 8 MB L3 cache, making direct comparisons surprisingly meaningful. The data shows a clear overall winner in compute workloads, but the older i7 still manages to claw back wins in a few specific tasks.

Where Each One Wins

The Xeon E3-1565L v5 is the dominant force in raw processing power. It wins 13 of the 17 head-to-head benchmarks, and its victories are not marginal. In multi-threaded workloads, it consistently outperforms the i7-3770 by roughly 14%. This is visible across all three Cinebench versions: R15, R20, and R23 show a nearly identical 14.2% delta in multicore tests. The Xeon's advantage extends to single-core performance as well, where it leads by 14.3% to 14.6% in the Cinebench suite. This makes it the better choice for almost any CPU-bound task, from rendering to compilation.

The Xeon's most dramatic win comes in PassMark physics, where it scores 794 versus the i7's 458. That is a 73.4% advantage, a massive gap indicating significantly better floating-point and physics simulation capability. It also excels in extended instruction workloads (34.7% lead) and prime number finding (48.3% lead). These are compute-heavy tasks that benefit from the newer Skylake architecture's improved execution units.

However, the Core i7-3770 is not without its strengths. It wins the PassMark single-thread test with a score of 2073 versus the Xeon's 1970, a 5% advantage. This is a meaningful result for legacy software that relies on a single core with high clock speed. The i7-3770 also wins in data compression (105424 vs 94771, a 10.1% lead) and random string sorting (14060 vs 11543, a 17.9% lead). These are memory-latency-sensitive and cache-friendly workloads where the i7's higher base clock (3.40 GHz vs 2.50 GHz) and boost clock (3.90 GHz vs 3.50 GHz) appear to compensate for its older architecture.

The Verdict

The data is unambiguous for most users: the Xeon E3-1565L v5 is the superior processor. It wins in every multi-threaded benchmark, every single-core Cinebench test, and the vast majority of PassMark subtests. Its 14.2% lead in multithread and 14.3% lead in Cinebench single-core are consistent and decisive. If your workload involves rendering, encoding, scientific computing, or any modern multi-threaded application, the Xeon is the clear pick.

The Core i7-3770 is only preferable in a narrow set of circumstances. If you are running software that is heavily dependent on single-thread performance and cannot utilize multiple cores effectively, the i7's 5% lead in PassMark single-thread is worth noting. Its wins in data compression and random string sorting suggest that certain memory-bound or cache-dependent algorithms still favor its higher clock speeds. Additionally, the i7 uses the standard LGA 1155 socket, which is far more common in DIY desktop motherboards than the Xeon's BGA 1440 package, which is soldered. For a drop-in upgrade to an existing 1155 system, the i7 makes practical sense.

But for new builds or any workload that can use more than one thread, the Xeon E3-1565L v5 wins outright. Its 35W TDP is less than half the i7's 77W TDP, making it dramatically more power-efficient while delivering higher performance. The only reasons to choose the i7-3770 are specific software compatibility, the convenience of a socketed desktop platform, or the need for that particular single-thread PassMark edge.

Head-to-Head Benchmarks

The Cinebench suite provides the clearest picture of the performance gap. In Cinebench R23 multi-core, the Xeon scores 6226 against the i7's 5450, a 14.2% difference. This pattern repeats exactly in R15 (627 vs 549) and R20 (2614 vs 2289). Single-core results are equally consistent: the Xeon leads by 14.3% in R15 (88 vs 77) and R23 (879 vs 769), and by 14.6% in R20 (369 vs 322). This uniformity indicates a fundamental architecture advantage, not a workload-specific quirk.

The PassMark physics test reveals the largest single gap. The Xeon's 794 score versus the i7's 458 represents a 73.4% advantage. This is far larger than the multi-threaded average, suggesting the Skylake architecture has significantly improved physics simulation and collision detection capabilities. The extended instructions test shows a 34.7% lead (6031 vs 4476), and prime number finding shows a 48.3% lead (43 vs 29), both indicating superior integer and SIMD execution.

The i7's wins, while fewer, are still notable. In data compression, it scores 105424 versus the Xeon's 94771, a 10.1% lead. In random string sorting, it wins 14060 to 11543, a 17.9% margin. Its PassMark single-thread score of 2073 beats the Xeon's 1970 by 5%. These wins suggest that the i7's higher clock speeds (3.40 GHz base, 3.90 GHz boost) give it an edge in latency-sensitive tasks that do not scale well with newer instruction sets. The data encryption test is a decisive Xeon win at 2314 vs 1866 (24% lead), showing that the newer architecture's AES-NI implementation is substantially faster.

FAQ

Q: Which CPU is faster for multi-threaded rendering?

A: The Xeon E3-1565L v5 is faster across all Cinebench multi-core tests, leading by 14.2% in R15, R20, and R23. In R23, it scores 6226 versus the i7-3770's 5450.

Q: Does the Core i7-3770 have any advantage at all?

A: Yes. The i7-3770 wins in PassMark single-thread (2073 vs 1970, a 5% lead), data compression (105424 vs 94771, a 10.1% lead), and random string sorting (14060 vs 11543, a 17.9% lead).

Q: What is the biggest performance gap between the two?

A: The largest gap is in PassMark physics, where the Xeon E3-1565L v5 scores 794 versus the i7-3770's 458, a 73.4% advantage.

Q: Which CPU is more power-efficient?

A: The Xeon E3-1565L v5 has a 35W TDP, while the Core i7-3770 has a 77W TDP. The Xeon delivers higher performance at less than half the power envelope.

Q: Are these CPUs compatible with the same motherboards?

A: No. The Xeon E3-1565L v5 uses the Intel BGA 1440 socket, which is soldered to the board. The Core i7-3770 uses the Intel Socket 1155, a standard socketed desktop interface.

Q: Which CPU has better integrated graphics?

A: The Xeon E3-1565L v5 features Iris Pro Graphics P580, while the Core i7-3770 has Intel HD 4000. The Xeon's integrated graphics are from a newer architecture generation.

Architecture Differences

The Xeon E3-1565L v5 is built on the Skylake architecture (codename Skylake-H) using a 14 nm process node. It contains 2,300 million transistors on a 171 mm² die. The Core i7-3770 uses the older Ivy Bridge architecture on a 22 nm process, with 1,400 million transistors on a 160 mm² die. This process shrink allows the Xeon to fit 64% more transistors into a similar die area, contributing to its higher performance and much lower power consumption.

The Xeon also supports both DDR3 and DDR4 memory, while the i7-3770 is limited to DDR3 only. This gives the Xeon a memory bandwidth advantage of 34.1 GB/s versus 25.6 GB/s for the i7. Both CPUs use dual-channel memory buses and offer the same PCIe Gen 3 with 16 lanes from the CPU. The Xeon supports ECC memory, making it suitable for error-sensitive server workloads, while the i7-3770 does not. The Xeon's integrated graphics are the Iris Pro Graphics P580, a significantly more capable GPU than the i7's Intel HD 4000.

Specification Differences

| Specification | Intel Xeon E3-1565L v5 | Intel Core i7-3770 |

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

| Base Clock | 2.50 GHz | 3.40 GHz |

| Boost Clock | 3.50 GHz | 3.90 GHz |

| TDP | 35 W | 77 W |

| Socket | Intel BGA 1440 | Intel Socket 1155 |

| Process Node | 14 nm | 22 nm |

| Memory Support | DDR3, DDR4 | DDR3 |

| Memory Bandwidth | 34.1 GB/s | 25.6 GB/s |

| ECC Memory | Yes | No |

| Integrated Graphics | Iris Pro Graphics P580 | Intel HD 4000 |

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

| Die Size | 171 mm² | 160 mm² |

| Launch MSRP | $417 | $278 |

The Core i7-3770 has significantly higher clock speeds, with a 3.40 GHz base and 3.90 GHz boost, compared to the Xeon's 2.50 GHz base and 3.50 GHz boost. However, the Xeon compensates with a more efficient architecture and a 35W TDP versus the i7's 77W. The Xeon's BGA 1440 socket is soldered, while the i7 uses the socketed LGA 1155. The Xeon also adds ECC support and DDR4 memory compatibility, along with a much newer integrated GPU. The transistor count difference (2,300 million vs 1,400 million) reflects the architectural advancement, despite similar die sizes.