Intel Core i3-N305 vs Intel Xeon E3-1585L v5 Comparison

The Intel Xeon E3-1585L v5 and Intel Core i3-N305 occupy different corners of the Intel lineup, separated by seven years of architecture evolution. The Xeon is a 4-core, 8-thread Skylake-H part from 2016, built on Intel's 14 nm process and aimed at servers and workstations. The Core i3-N305 is an 8-core, 8-thread Gracemont design from 2023, manufactured on a 10 nm node for mobile devices. The benchmark data shows a surprising split: the newer i3 wins five of six head-to-head tests, but the older Xeon delivers one decisive victory in the most demanding multi-threaded workload. Both processors hold a 44th percentile ranking among all CPUs, with average benchmark scores of 1989 and 1979 respectively, placing them in nearly identical overall performance tiers despite their architectural differences.

FAQ

Q: Which processor has the higher core count?

A: The Intel Core i3-N305 has 8 cores, while the Intel Xeon E3-1585L v5 has 4 cores. Both processors support 8 threads, meaning the Xeon uses Hyper-Threading while the i3 does not.

Q: How do the single-core scores compare in Cinebench R23?

A: The Core i3-N305 edges out the Xeon with a score of 995 versus 971, a difference of 2.4%. This is the narrowest margin in any of the head-to-head benchmark tests.

Q: Which processor wins the multi-core test in Cinebench R20?

A: The Core i3-N305 scores 3349 compared to the Xeon's 2888, giving the i3 a 13.8% lead. The i3 also wins multi-core in Cinebench R15 with 829 versus 693, a 16.4% advantage.

Q: What is the most significant performance gap in the benchmark data?

A: The Xeon E3-1585L v5 wins Cinebench R23 multi-core with a score of 6878 against the i3-N305's 5092, a 35.1% margin. This is the only test where the Xeon comes out ahead.

Q: Do both processors support ECC memory?

A: No. The Xeon E3-1585L v5 supports ECC memory, while the Core i3-N305 does not. This is a key differentiator for server and workstation use cases.

Q: How do the integrated graphics compare?

A: The Xeon uses Iris Pro Graphics P580, while the Core i3-N305 features UHD Graphics 770. The benchmark data does not include graphics performance scores, so no direct comparison is possible from the available numbers.

Architecture Differences

The two processors represent fundamentally different design philosophies. The Xeon E3-1585L v5 uses the Skylake architecture on a 14 nm process, with a die size of 171 mm² and 2,300 million transistors. The Core i3-N305 employs the Gracemont architecture, which is Intel's efficiency-focused core design, on a 10 nm process. The Xeon has 4 cores and 8 threads, relying on simultaneous multi-threading to reach its thread count, while the i3-N305 has 8 physical cores but only 8 threads, with no multi-threading support. This means the i3's core count advantage is doubled in multi-threaded scenarios, but the Xeon's SMT can help with certain workloads.

Cache hierarchies differ significantly. The Xeon provides 64 KB of L1 and 256 KB of L2 per core, plus 8 MB of shared L3 cache. The i3-N305 offers 96 KB of L1 per core and 2 MB of L2 per module, with 6 MB of shared L3 cache. The larger per-core L1 cache on the i3 reflects the Gracemont architecture's design for efficiency, while the Xeon's larger shared L3 benefits from its server-oriented heritage. Memory support also diverges: the Xeon supports DDR3 and DDR4 in dual-channel configuration with 34.1 GB/s bandwidth, while the i3 supports DDR4 and DDR5 but in single-channel mode, achieving 38.4 GB/s bandwidth despite the narrower bus.

The Xeon is built for the Intel BGA 1440 socket with 16 PCIe Gen 3 lanes, while the i3-N305 uses the Intel BGA 1264 socket with only 9 PCIe Gen 3 lanes. The Xeon's ECC memory support and server/workstation market segment contrast with the i3's mobile segment positioning. The Xeon has a 45 W TDP, triple the i3's 15 W TDP, reflecting the power efficiency of the newer Gracemont cores. The Xeon is end-of-life with a release date of May 2016, while the i3 remains active with a January 2023 release. The Xeon's launch MSRP was $445, and the i3's launch MSRP was $309.

Head-to-Head Benchmarks

The benchmark results paint a clear picture of generational improvement mixed with one notable exception. In Cinebench R15 single-core, the i3-N305 scores 164.7 versus the Xeon's 97, a 41.1% advantage that represents the largest performance gap in either direction. This is the most dramatic single-core difference, showing how far Intel's architecture has come in single-threaded efficiency. The R20 single-core test shows a smaller but still substantial 13.8% lead for the i3, with scores of 472 versus 407. In R23 single-core, the gap narrows to just 2.4%, with the i3 scoring 995 and the Xeon at 971.

Multi-core results are more complex. The i3-N305 wins R15 multi-core with 829 against 693, a 16.4% margin, and R20 multi-core with 3349 against 2888, a 13.8% margin. These wins reflect the i3's 8 physical cores overpowering the Xeon's 4 cores with SMT. However, the Xeon strikes back decisively in R23 multi-core, scoring 6878 versus the i3's 5092, a 35.1% margin. This reversal is striking because it contradicts the trend established in the earlier Cinebench versions. The Xeon's win in R23 multi-core suggests that the workload's scaling characteristics favor the Skylake architecture's higher memory bandwidth and dual-channel configuration, despite the i3's core count advantage.

Across all six head-to-head tests, the i3-N305 wins five, with the Xeon taking only the R23 multi-core test. The average benchmark scores reflect this overall balance: the Xeon averages 1989, while the i3 averages 1979, a difference of just 0.5%. Both processors land at the 44th percentile of all CPUs, indicating they occupy the same tier in the overall performance distribution. The nearest rivals for the Xeon include the Intel Xeon E3-1285L v4 (avg score 1991, delta -0.1%), Intel Core i5-8279U (avg score 1987, delta +0.1%), AMD Ryzen 5 1500X (avg score 1992, delta -0.1%), and AMD Ryzen Embedded V1756B (avg score 1986, delta +0.2%). The i3's nearest rivals include the Intel Core i5-7600K (avg score 1976, delta +0.1%), Intel Xeon E3-1245 v5 (avg score 1973, delta +0.3%), AMD Ryzen Embedded V1756B (avg score 1986, delta -0.3%), and Intel Core i5-8279U (avg score 1987, delta -0.4%).

Specification Differences

The two processors differ in nearly every specification category. The Xeon has 4 cores and 8 threads, while the i3 has 8 cores and 8 threads. Base clock speeds are 3.00 GHz for the Xeon and 100.00 GHz for the i3, with boost clocks of 3.70 GHz and 3.80 GHz respectively. The Xeon has a 45 W TDP versus the i3's 15 W TDP. Sockets differ: Intel BGA 1440 for the Xeon, Intel BGA 1264 for the i3. The process nodes are 14 nm for the Xeon and 10 nm for the i3. The Xeon has 2,300 million transistors on a 171 mm² die, while the i3's transistor count and die size are not provided.

Cache layouts diverge: the Xeon offers 64 KB L1 and 256 KB L2 per core with 8 MB shared L3, while the i3 provides 96 KB L1 per core and 2 MB L2 per module with 6 MB shared L3. Memory support shows the Xeon accepting DDR3 and DDR4 in dual-channel mode with 34.1 GB/s bandwidth, while the i3 accepts DDR4 and DDR5 in single-channel mode with 38.4 GB/s bandwidth. ECC memory is supported on the Xeon but not the i3. PCIe configurations list Gen 3 with 16 lanes for the Xeon and Gen 3 with 9 lanes for the i3. Integrated graphics are Iris Pro Graphics P580 on the Xeon and UHD Graphics 770 on the i3. The Xeon targets the server/workstation segment and is end-of-life, while the i3 targets mobile and remains active. Release dates are May 2016 for the Xeon and January 2023 for the i3. The Xeon's launch MSRP was $445, and the i3's launch MSRP was $309. Neither processor has an unlocked multiplier.

The Verdict

The data supports choosing the Intel Core i3-N305 for most workloads. It wins five of six head-to-head benchmarks, including all single-core tests and two of three multi-core tests. Its 8 physical cores provide a 16.4% advantage in R15 multi-core and a 13.8% advantage in R20 multi-core over the Xeon. The i3 also offers substantial efficiency benefits with a 15 W TDP compared to the Xeon's 45 W, making it suitable for mobile and power-constrained environments. Its support for DDR5 memory and newer 10 nm process node indicate a more modern platform.

The Intel Xeon E3-1585L v5 retains a specific advantage in Cinebench R23 multi-core, where its 6878 score beats the i3 by 35.1%. This result suggests that certain heavily multi-threaded workloads may still favor the Xeon's architecture, particularly those that benefit from dual-channel memory bandwidth. The Xeon's ECC memory support is a critical feature for server and workstation deployments that require data integrity. Its 16 PCIe lanes versus the i3's 9 lanes also provide more connectivity options for expansion.

For users prioritizing overall benchmark performance, the i3-N305 is the clear choice based on the win count and average scores. For users with specific workloads that match the Xeon's R23 multi-core strength, or who require ECC memory and server-grade features, the Xeon remains viable despite being end-of-life.

Where Each One Wins

The Intel Core i3-N305 dominates in single-core performance across all tested Cinebench versions. Its R15 single-core score of 164.7 is 41.1% higher than the Xeon's 97, and it maintains leads of 13.8% in R20 and 2.4% in R23. This makes the i3 the better choice for applications that are lightly threaded or latency-sensitive, where individual core speed matters more than core count. The i3 also wins multi-core in R15 and R20, with margins of 16.4% and 13.8% respectively, indicating strong performance in moderately threaded workloads like everyday productivity and content creation tasks that scale to 8 cores.

The Intel Xeon E3-1585L v5 wins exclusively in Cinebench R23 multi-core, where its 6878 score surpasses the i3's 5092 by 35.1%. This substantial margin suggests the Xeon excels in workloads that stress sustained multi-threaded performance with high memory bandwidth demands, such as rendering or scientific computing. The Xeon's dual-channel memory configuration and larger shared L3 cache of 8 MB likely contribute to this advantage over the i3's single-channel setup and 6 MB L3. Additionally, the Xeon's ECC memory support and 16 PCIe lanes give it an edge in enterprise environments, even though these features do not appear directly in benchmark scores. The i3's 9 PCIe lanes and lack of ECC limit its appeal in server contexts, despite its superior benchmark showing in most tests.