Intel Core i3-9300 vs Intel Xeon E3-1268L v5 Comparison

The Verdict

The benchmark data presents an unusual outcome: the older Intel Xeon E3-1268L v5 wins all six head-to-head Cinebench comparisons against the Intel Core i3-9300, despite the i3 having higher clock speeds and being from a newer architecture generation. The Xeon's margins are razor-thin—ranging from 0.1% to 0.3%—but they are consistent across every test iteration, from R15 to R23.

The average benchmark score tells the same story: the Xeon E3-1268L v5 sits at 1557, while the Core i3-9300 trails at 1554, a 0.2% difference. Both processors occupy the 39th percentile among all CPUs, meaning they perform essentially identically in aggregate workloads. The nearest rival data reinforces this: each processor lists the other as its closest competitor, with the Xeon showing a +0.2% delta over the i3, and the i3 showing a -0.2% delta relative to the Xeon.

Who should pick which? The data suggests the Xeon E3-1268L v5 for anyone prioritizing multi-threaded throughput in a constrained power envelope—its 35W TDP is dramatically lower than the i3-9300's 62W, yet it still edges ahead in every benchmark. The Core i3-9300 makes sense for buyers who need a desktop-focused part with a newer integrated GPU (UHD 630 versus HD Graphics P530) and who don't require the Xeon's server-oriented features like ECC memory support, which the i3 also offers. However, the performance data alone gives no compelling reason to choose the i3 over the Xeon unless the newer platform or graphics matter more than the slight benchmark advantage.

Architecture Differences

The two processors represent different Intel design philosophies despite sharing the same 14nm process node. The Xeon E3-1268L v5 is built on Skylake architecture (Skylake-DT codename) and belongs to the Xeon E3 generation, positioned for the server/workstation market segment. The Core i3-9300 uses Coffee Lake architecture (Coffee Lake Refresh codename) and targets mainstream desktop use.

Both chips feature 4 physical cores and 8MB of shared L3 cache, with identical per-core L1 (64 KB) and L2 (256 KB) cache configurations. The critical architectural divergence lies in threading: the Xeon supports 8 threads (4 cores, 8 threads), while the i3-9300 is limited to 4 threads (4 cores, 4 threads). This means the Xeon can process twice as many concurrent threads, which explains how it maintains a benchmark edge despite lower clock speeds.

Clock speeds differ substantially. The Xeon runs at a 2.40 GHz base clock with a 3.40 GHz boost, while the i3-9300 starts at 3.70 GHz base and boosts to 4.30 GHz. The i3's clocks are 54% higher at base and 26% higher at boost—yet it still loses every benchmark. This implies the Xeon's hyper-threading advantage fully compensates for the clock deficit in multi-threaded workloads, and even in single-threaded tests, the Xeon manages to tie or slightly win despite the massive clock disadvantage.

Memory support also diverges: the Xeon supports both DDR3 and DDR4 memory, while the i3 supports only DDR4. Both use dual-channel memory buses, but memory bandwidth differs—the Xeon delivers 34.1 GB/s versus the i3's 38.4 GB/s. The Xeon's die size is smaller at 122 mm² versus 126 mm² for the i3, and the Xeon contains 1,750 million transistors (the i3's transistor count is not listed).

The Xeon integrates HD Graphics P530, while the i3 features UHD 630. Both use PCIe Gen 3 with 16 CPU lanes. The Xeon was released in October 2015 with a launch MSRP of $377; the i3-9300 arrived in April 2019 with a launch MSRP of $143.

FAQ

Q: Which processor wins more benchmark tests?

A: The Intel Xeon E3-1268L v5 wins all 6 head-to-head Cinebench comparisons (R15, R20, and R23, both multicore and singlecore). The Core i3-9300 wins zero.

Q: How close are the two processors in average benchmark score?

A: The Xeon E3-1268L v5 averages 1557 points, while the Core i3-9300 averages 1554 points—a difference of just 0.2%. Both sit at the 39th percentile among all CPUs.

Q: Does the Core i3-9300's higher clock speed translate to better single-core performance?

A: No. Despite a 3.70 GHz base and 4.30 GHz boost (versus 2.40/3.40 GHz for the Xeon), the i3-9300 loses or ties every single-core test. In Cinebench R23 single-core, the Xeon scores 760 versus 758 for the i3, a 0.3% margin.

Q: What memory types does each processor support?

A: The Xeon E3-1268L v5 supports both DDR3 and DDR4 memory, while the Core i3-9300 supports only DDR4. Both use dual-channel memory buses, with the Xeon at 34.1 GB/s bandwidth and the i3 at 38.4 GB/s.

Q: Do both processors support ECC memory?

A: Yes, both the Xeon E3-1268L v5 and the Core i3-9300 list ECC memory support as true.

Q: What are the power consumption differences?

A: The Xeon E3-1268L v5 has a 35W TDP, while the Core i3-9300 has a 62W TDP. The Xeon delivers better or equal benchmark results while consuming 27W less.

Specification Differences

| Specification | Intel Xeon E3-1268L v5 | Intel Core i3-9300 |

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

| Cores | 4 | 4 |

| Threads | 8 | 4 |

| Base Clock | 2.40 GHz | 3.70 GHz |

| Boost Clock | 3.40 GHz | 4.30 GHz |

| TDP | 35W | 62W |

| Architecture | Skylake | Coffee Lake |

| Codename | Skylake-DT | Coffee Lake |

| Die Size | 122 mm² | 126 mm² |

| Transistors | 1,750 million | Not listed |

| Memory Support | DDR3, DDR4 | DDR4 |

| Memory Bandwidth | 34.1 GB/s | 38.4 GB/s |

| Integrated Graphics | HD Graphics P530 | UHD 630 |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2015-10-18 | 2019-04-22 |

| Launch MSRP | $377 | $143 |

| Part Number | SR2LQ | SRCZU |

Head-to-Head Benchmarks

The benchmark results are remarkably consistent: the Xeon E3-1268L v5 wins every single test, but by margins so small they approach statistical noise. In Cinebench R15 multicore, the Xeon scores 542 versus 541 for the i3—a 0.2% advantage. The R15 single-core test results in a tie at 76 points each, with a 0% delta.

Moving to Cinebench R20, the Xeon maintains its edge: 2260 versus 2257 in multicore (0.1% delta) and 319 versus 318 in single-core (0.3% delta). The largest margins appear in the newest test suite. In Cinebench R23 multicore, the Xeon scores 5383 against 5374 for the i3, a 0.2% difference. The R23 single-core test shows the Xeon at 760 versus 758, again a 0.3% margin.

The pattern is striking: the i3-9300's 4.30 GHz boost clock should theoretically dominate in single-core tests, yet it loses both R20 and R23 single-core tests to a processor running at 3.40 GHz max boost. The 0% delta in R15 single-core suggests the two are essentially matched in per-core performance, with the Xeon's older Skylake architecture proving just as efficient per clock as the newer Coffee Lake design.

The multi-core results are even more telling. With only 4 threads versus the Xeon's 8 threads, the i3-9300 still comes within 0.1-0.2% of the Xeon in multi-threaded workloads. This indicates that the i3's higher clock speed nearly compensates for having half the threads—but not quite. The Xeon's hyper-threading provides just enough additional throughput to edge ahead in every iteration.

Where Each One Wins

Intel Xeon E3-1268L v5 wins on: Every benchmark category. The data shows 6 wins out of 6 head-to-head comparisons. Its advantages are most pronounced in single-core tests (0.3% deltas in R20 and R23) and least pronounced in R15 multicore (0.2%) and R20 multicore (0.1%). The Xeon also wins on power efficiency: 35W TDP versus 62W for the i3, meaning it delivers marginally better performance while consuming 43% less power. For server/workstation environments where power density and thermal output matter, this is a decisive factor. The Xeon's support for both DDR3 and DDR4 memory provides platform flexibility, and its server market segment positioning suggests validated reliability for always-on workloads.

Intel Core i3-9300 wins on: Clock speed dominance—3.70 GHz base and 4.30 GHz boost are substantially higher than the Xeon's 2.40/3.40 GHz. The i3 also has higher memory bandwidth at 38.4 GB/s versus 34.1 GB/s, and it includes the newer UHD 630 integrated graphics compared to the HD Graphics P530. Its launch MSRP of $143 is lower than the Xeon's $377, though pricing considerations are noted separately. The i3-9300's Coffee Lake architecture is newer (released 2019 versus 2015), and its desktop market segment suggests it may be better suited for consumer-oriented platforms, even though both use the same Intel Socket 1151.

The data's verdict: These two processors are effectively equivalent in raw compute performance, with the Xeon holding a razor-thin edge across all tests. The deciding factors are not benchmark scores but platform context: the Xeon for power-sensitive server environments requiring ECC memory and lower TDP, the i3 for desktop builds where higher clocks, newer graphics, and greater memory bandwidth are priorities—even if those priorities don't translate into benchmark wins in this comparison.