CPU Comparison

The Intel Atom C5315 and Intel Core i7-3540M target entirely different corners of the market, yet their benchmark scores align so closely that they occupy nearly the same performance tier. The Atom is a modern, low-power server chip built on a 10 nm process, while the Core i7 is a 22 nm mobile processor from 2013. Despite their generational and architectural gulf, the data reveals a statistical dead heat in CPU workloads, with the Atom taking a narrow edge in every recorded Cinebench test.

Head-to-Head Benchmarks

The head-to-head results show a consistent, though razor-thin, victory for the Intel Atom C5315 across all five shared Cinebench tests. In Cinebench R15 multicore, the Atom scores 255 against the Core i7’s 254, a delta of just 0.4%. The pattern repeats in Cinebench R20 multicore, where the Atom posts 1063 versus 1060, a 0.3% advantage. Single-core performance is essentially identical: both chips record exactly 149 in Cinebench R20 single-core, resulting in a 0% delta. The Atom wins that tie by default as the listed winner, but the scores are indistinguishable.

Moving to Cinebench R23, the Atom again leads by the slimmest of margins. Its multicore score of 2533 beats the Core i7’s 2525 by 0.3%, while single-core shows 357 against 356, another 0.3% edge. Across all five tests, the Atom wins five and the Core i7 wins zero, yet the largest margin of victory is a mere 0.4%. In practical terms, these results indicate that neither chip offers a meaningful performance advantage over the other in rendering or general CPU workloads. The average benchmark scores confirm this: the Atom averages 871, while the Core i7 averages 867, a difference of less than half a percent.

The nearest-rival data places both chips in the same performance neighborhood. The Atom’s closest rival is the AMD Athlon PRO 3045B, which scores 872 against the Atom’s 871, a -0.1% delta. The Core i7’s nearest rival is the Intel Xeon X3460 at 866, a 0.1% delta. Notably, each chip lists the other as a nearest rival: the Atom’s deltaPct versus the Core i7 is 0.5%, while the Core i7’s deltaPct versus the Atom is -0.5%. This reciprocal relationship underscores their equivalence. Both also sit at the 23rd percentile among all CPUs, indicating that they are entry-level performers by modern standards.

Where Each One Wins

Given the near-identical benchmark scores, the differentiators are not raw performance but platform features and intended use cases. The Intel Atom C5315 wins in server and workstation contexts. It supports ECC memory, a feature absent from the Core i7, and pairs with DDR4 memory in a dual-channel configuration. Its memory bandwidth is rated at 38.4 GB/s, a figure the Core i7 does not specify. The Atom also offers PCIe Gen 3 with 8 lanes from the CPU, making it suitable for low-power storage or network appliances. Its active production status and 2022 release date mean it is a current, supported part for embedded or microserver designs.

The Intel Core i7-3540M wins in mobile and general-purpose computing. It includes integrated graphics in the form of Intel HD 4000, which the Atom lacks entirely, so the Core i7 can drive a display without a discrete GPU. It also has a higher base clock of 3.00 GHz and a boost clock of 3.70 GHz, allowing it to burst to higher frequencies for short workloads. The Core i7 uses DDR3 memory, which is older but more common in legacy laptops, and its 35 W TDP is slightly lower than the Atom’s 38 W. For tasks that rely on a single thread, the Core i7’s boost capability could provide a subjective responsiveness advantage, even though the Cinebench single-core scores are tied.

The Core i7 also has a larger die and more transistors per core, but without specific transistor counts, the data only shows its 118 mm² die size. The Atom’s die size is not listed. In terms of cache, the Core i7 offers 4 MB of shared L3 cache, while the Atom has no L3 and instead relies on 4.5 MB of L2 per module. The Atom’s L1 cache is 64 KB per core, matching the Core i7’s L1, but the Core i7’s L2 is 256 KB per core versus the Atom’s module-level L2. These differences matter for specific workloads, but the benchmark data shows they net out to almost identical scores.

Architecture Differences

The two processors come from different eras and philosophies. The Intel Atom C5315 uses the Tremont microarchitecture, part of the Parker Ridge codename, built on a 10 nm process. It is a 4-core, 4-thread design with no hyper-threading, running at a fixed 2.40 GHz with no boost clock. Its cache hierarchy is unusual: 64 KB of L1 per core and 4.5 MB of L2 per module, with no L3. This design prioritizes power efficiency and predictable throughput over burst performance. The Atom’s memory support is DDR4 in dual-channel mode, with ECC capability, and it exposes 8 PCIe Gen 3 lanes. It has no integrated graphics and is classified as a server/workstation part.

The Intel Core i7-3540M is a much older design, using the Ivy Bridge architecture on a 22 nm process. It has 2 cores and 4 threads, enabled by hyper-threading, with a base clock of 3.00 GHz and a boost clock of 3.70 GHz. Its cache setup is more conventional: 64 KB L1 per core, 256 KB L2 per core, and 4 MB of shared L3. The Core i7 supports DDR3 memory in dual-channel mode, but without ECC. It includes Intel HD 4000 integrated graphics and fits the mobile socket G2 (988B). The die size is 118 mm², a figure not provided for the Atom. Both chips have locked multipliers, so neither can be overclocked.

The process node difference is stark: 10 nm for the Atom versus 22 nm for the Core i7. This explains how the Atom achieves comparable performance with lower power consumption per transistor, though its TDP is actually 3 W higher than the Core i7’s (38 W versus 35 W). The Atom’s lack of boost clock means it runs at a constant 2.40 GHz, while the Core i7 can ramp up to 3.70 GHz, yet the benchmark results show that sustained multicore workloads favor the Atom slightly. The single-core tie suggests that the Atom’s Tremont cores are more efficient per clock than Ivy Bridge cores, compensating for the Core i7’s higher frequency.

FAQ

Q: Which CPU has better multicore performance?

A: The Intel Atom C5315 edges out the Core i7-3540M in every multicore test. It scores 255 versus 254 in Cinebench R15, 1063 versus 1060 in R20, and 2533 versus 2525 in R23, with deltas ranging from 0.3% to 0.4%.

Q: Do these processors differ in single-core speed?

A: No, they are effectively tied. Both score exactly 149 in Cinebench R20 single-core, and the Atom leads by just 1 point in R23 (357 versus 356). The Core i7’s higher boost clock of 3.70 GHz does not translate into a measurable single-thread advantage.

Q: Can the Core i7 use ECC memory?

A: No. ECC memory support is exclusive to the Atom C5315. The Core i7-3540M lacks this feature, which is a key reason the Atom is suited for server or workstation roles where data integrity is critical.

Q: Which processor includes integrated graphics?

A: Only the Core i7-3540M has integrated graphics, specifically Intel HD 4000. The Atom C5315 has no integrated graphics, so it requires a discrete GPU or is used in headless server configurations.

Q: How do these chips compare in memory support?

A: The Atom supports DDR4 in dual-channel mode with a bandwidth of 38.4 GB/s, while the Core i7 supports DDR3 in dual-channel mode without a listed bandwidth figure. The Atom’s memory is newer and faster on paper, but the benchmark scores show this does not translate into a large CPU performance gap.

Q: Are these processors on the same process node?

A: No. The Atom C5315 is built on Intel’s 10 nm process, while the Core i7-3540M uses the older 22 nm process. This generational difference is significant, yet the Core i7 compensates with higher clocks and hyper-threading to nearly match the Atom.

Specification Differences

The table below lists only the fields where the two processors differ, based on the the benchmark database data.

| Specification | Intel Atom C5315 | Intel Core i7-3540M |

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

| Cores | 4 | 2 |

| Threads | 4 | 4 |

| Base Clock | 2.40 GHz | 3.00 GHz |

| Boost Clock | None | 3.70 GHz |

| TDP | 38 W | 35 W |

| Socket | Intel BGA 2106 | Intel Socket G2 (988B) |

| Codename | Parker Ridge | Ivy Bridge |

| Generation | Atom (Tremont) | Core i7 (Ivy Bridge) |

| Process Node | 10 nm | 22 nm |

| Die Size | Not listed | 118 mm² |

| L2 Cache | 4.5 MB (per module) | 256 KB (per core) |

| L3 Cache | None | 4 MB (shared) |

| Memory Support | DDR4 | DDR3 |

| Memory Bandwidth | 38.4 GB/s | Not listed |

| ECC Memory | Yes | No |

| PCIe | Gen 3, 8 Lanes (CPU only) | Not listed |

| Integrated Graphics | N/A | Intel HD 4000 |

| Market Segment | Server/Workstation | Mobile |

| Production Status | Active | Not listed |

| Release Date | 2022-06-05 | 2013-01-07 |

| Launch MSRP | $213 | Not listed |

| Part Number | SRL3Y | SR0X6 |

| Avg Benchmark Score | 871 | 867 |

| Percentile vs All CPUs | 23 | 23 |