Intel Atom x7809C vs Intel Core i5-9400F Comparison

Head-to-Head Benchmarks

The recorded data paints a surprisingly close picture for overall compute throughput, but the individual workloads reveal two very different processors. Across the 17 head-to-head benchmark comparisons, the Intel Core i5-9400F takes 14 wins while the Intel Atom x7809C claims 3. However, the margin in the synthetic multi-threaded tests is razor-thin. In Cinebench R15 multicore, the i5-9400F scores 810 against 805 for the Atom, a delta of just 0.6%. That pattern repeats in Cinebench R20 multicore (3376 vs 3358, 0.5%) and Cinebench R23 multicore (8040 vs 7997, 0.5%). The PassMark multithread test shows the same story: 9455 for the i5-9400F versus 9409 for the Atom, a 0.5% edge. These results indicate that in purely threaded rendering workloads, the two chips are effectively interchangeable, despite their very different architectures and power envelopes.

Single-core performance is where the Core i5-9400F builds a more decisive lead. In Cinebench R15 single-core, the i5-9400F scores 114 against 113 for the Atom, only a 0.9% gap. Cinebench R20 single-core shows 476 versus 474, a 0.4% difference. The PassMark single-thread test, however, is far more lopsided: the i5-9400F posts 2428 while the Atom manages 1462, a 66.1% advantage for the Core part. This dramatic divergence suggests that the PassMark single-thread workload is far more sensitive to the architectural differences between the Coffee Lake core and the Gracemont Atom core, while the Cinebench single-thread tests are more forgiving.

The largest win for the i5-9400F comes in the PassMark extended instructions test, where it scores 11684 against 5509 for the Atom, a staggering 112.1% advantage. This workload likely leverages the wider execution resources and deeper out-of-order capabilities of the Coffee Lake core. The i5-9400F also wins decisively in floating-point math, posting 22465 versus 17856, a 25.8% lead. Data compression shows a 19.1% edge for the i5-9400F (132877 vs 111525), and prime number finding goes to the i5-9400F by 31% (38 vs 29). Random string sorting is closer, with the i5-9400F ahead by 3.6% (16298 vs 15728).

The Atom x7809C's three wins are concentrated in specific workloads. The most dramatic is data encryption, where the Atom scores 7832 against just 2902 for the i5-9400F, a 62.9% advantage for the Atom. This suggests the Atom's Gracemont cores include more efficient cryptographic instruction handling or better parallelization for this specific task. The Atom also wins in integer math, scoring 28946 versus 26155, a 9.6% lead. Finally, the PassMark physics test goes to the Atom by 4.8% (686 vs 653). These wins indicate that the Atom is not merely a low-power part; in certain integer-heavy or specialized workloads, it can genuinely outperform its desktop-oriented rival.

Where Each One Wins

For users focused on general productivity, content creation, and everyday multitasking, the Core i5-9400F is the clear choice based on the benchmark data. The 66.1% lead in single-thread performance and the 112.1% lead in extended instructions mean that lightly-threaded applications, such as web browsers, office suites, and many legacy programs, will feel noticeably more responsive on the i5-9400F. The 25.8% advantage in floating-point math also points to better performance in scientific computing, 3D rendering, and audio processing, where floating-point operations dominate. The 19.1% lead in data compression is relevant for file archiving and backup tasks, while the 31% edge in prime number finding suggests better performance in certain cryptographic or mathematical workloads.

The Atom x7809C, despite its lower overall benchmark average, carves out a specific niche. The 62.9% blowout in data encryption is the headline result. For workloads that involve heavy encryption, such as VPN endpoints, secure file transfer, or certain database operations, the Atom x7809C is demonstrably superior. The 9.6% win in integer math is also notable for applications that process large volumes of integer arithmetic, such as financial modeling, data validation, or certain types of database queries. The 4.8% edge in physics simulation, while modest, could be relevant for lightweight physics engines in embedded or edge computing scenarios.

The Cinebench results, where the two chips are within 0.6% across all versions, indicate that for pure multi-threaded rendering, users can expect nearly identical performance. This is a remarkable outcome given that the i5-9400F has a 65W TDP while the Atom x7809C is rated at just 25W. The Atom achieves this parity with two additional cores (8 vs 6) and a more modern 10nm process node, while the i5-9400F relies on higher clock speeds (4.10 GHz boost vs 3.60 GHz boost) and a larger shared L3 cache (9 MB vs 6 MB).

Architecture Differences

The architectural gap between these two processors is substantial. The Core i5-9400F is built on Intel's Coffee Lake architecture, using a 14nm process node, while the Atom x7809C uses the Amston Lake architecture on a 10nm node. The i5-9400F features 6 physical cores and 6 threads, while the Atom x7809C offers 8 cores and 8 threads. The Atom's generation is listed as "Atom (Gracemont)", indicating it uses Intel's efficient-core architecture, whereas the i5-9400F belongs to the Core i5 (Coffee Lake Refresh) generation.

Cache configurations differ significantly. The i5-9400F has 64 KB of L1 cache per core, 256 KB of L2 cache per core, and 9 MB of shared L3 cache. The Atom x7809C has 96 KB of L1 cache per core, 2 MB of L2 cache per module, and 6 MB of shared L3 cache. The larger L1 cache on the Atom suggests a design optimized for lower-latency access to frequently used data, while the larger L3 cache on the i5-9400F provides more capacity for sharing data across all cores.

Memory support is another major differentiator. The i5-9400F supports DDR4 memory over a dual-channel bus, providing 42.7 GB/s of memory bandwidth. The Atom x7809C supports both DDR4 and DDR5 but over a single-channel bus, delivering 38.4 GB/s of memory bandwidth. The single-channel configuration is a notable limitation for the Atom, although the newer DDR5 support partially compensates. Neither processor supports ECC memory.

PCIe connectivity also differs. The i5-9400F provides Gen 3 with 16 lanes from the CPU, while the Atom x7809C offers Gen 3 with only 9 lanes. This makes the i5-9400F better suited for discrete graphics cards or multiple NVMe drives, while the Atom's lane count is more appropriate for compact embedded designs with limited expansion needs. The i5-9400F has no integrated graphics, requiring a discrete GPU, while the Atom x7809C lists integrated graphics as "N/A" as well, meaning both require external display solutions.

The production status differs notably: the i5-9400F is end-of-life, having been released in January 2019, while the Atom x7809C is active, released in April 2024. The socket types also differ, with the i5-9400F using Intel Socket 1151 and the Atom using Intel BGA 1264, meaning the Atom is soldered to the board and not upgradeable. The TDP figures are starkly different: 65W for the i5-9400F versus 25W for the Atom, making the Atom far more suitable for fanless or thermally constrained designs.

FAQ

Q: Which processor is faster in multi-threaded rendering workloads?

A: They are essentially tied. In Cinebench R23 multicore, the Intel Core i5-9400F scores 8040 while the Intel Atom x7809C scores 7997, a difference of only 0.5%. The same pattern holds in Cinebench R15 and R20 multicore, with the i5-9400F ahead by 0.6% and 0.5% respectively.

Q: How big is the single-thread performance gap?

A: It depends on the benchmark. In Cinebench R15 single-core, the i5-9400F leads by only 0.9% (114 vs 113). However, in the PassMark single-thread test, the i5-9400F is 66.1% faster, scoring 2428 against the Atom's 1462.

Q: Does the Atom x7809C win any benchmarks?

A: Yes, it wins three of the 17 head-to-head tests. The most significant is PassMark data encryption, where it scores 7832 versus 2902 for the i5-9400F, a 62.9% advantage. It also wins in integer math (28946 vs 26155, a 9.6% lead) and PassMark physics (686 vs 653, a 4.8% lead).

Q: What is the average benchmark score for each processor?

A: The Intel Core i5-9400F has an average benchmark score of 13041, placing it in the 68th percentile of all CPUs. The Intel Atom x7809C has an average score of 12607, placing it in the 67th percentile. The difference is approximately 3.4%.

Q: How do their memory configurations compare?

A: The Core i5-9400F uses dual-channel DDR4 with 42.7 GB/s of bandwidth, while the Atom x7809C uses single-channel DDR4 or DDR5 with 38.4 GB/s. The i5-9400F has the higher memory bandwidth, though the Atom's support for DDR5 offers newer memory technology.

Q: Are these processors comparable in terms of power consumption?

A: No, there is a significant difference. The Core i5-9400F has a TDP of 65W, while the Atom x7809C has a TDP of 25W. This makes the Atom substantially more power-efficient, which is relevant for embedded or battery-powered applications.

The Verdict

The benchmark data supports a clear split based on use case. For desktop users running general productivity software, web browsing, office applications, and multi-threaded rendering, the Intel Core i5-9400F is the stronger performer. Its 66.1% lead in single-thread performance and 112.1% lead in extended instructions translate directly to snappier response in everyday tasks. Its 25.8% advantage in floating-point math and 19.1% lead in data compression make it the better choice for content creation and data-heavy workflows. The i5-9400F also offers dual-channel memory with higher bandwidth (42.7 GB/s vs 38.4 GB/s) and 16 PCIe Gen 3 lanes, making it more suitable for systems with discrete GPUs or multiple expansion devices. However, its end-of-life production status and 65W TDP are drawbacks for new designs.

For embedded systems, edge computing, or any application where power efficiency is paramount, the Intel Atom x7809C is the more compelling option. The 25W TDP, active production status, and 2024 release date indicate a modern, supported platform. The Atom's 62.9% advantage in data encryption makes it the clear choice for security-focused workloads such as VPN endpoints, encrypted storage gateways, or secure communication nodes. The 9.6% win in integer math also benefits database and financial applications that process large quantities of integer operations. The near-parity in Cinebench multicore results (within 0.6%) means that rendering tasks will not suffer significantly on the Atom, despite its lower power envelope.

The percentile rankings reinforce this split. The i5-9400F sits at the 68th percentile of all CPUs with an average score of 13041, while the Atom x7809C sits at the 67th percentile with 12607. These are very close overall standings, but the workload-specific deltas tell the real story. Users who prioritize raw responsiveness in single-threaded tasks should choose the i5-9400F. Users who prioritize encryption throughput, integer math, and power efficiency should choose the Atom x7809C. The Atom's nearest rivals include the Intel Core i3-1215U with a 0% delta, while the i5-9400F's nearest rival is the Intel Core i7-10750H at a 0.1% delta, indicating both chips sit at competitive performance levels within their respective market segments.