Intel Core i3-8350K

The Intel Core i3-8350K is a desktop processor from Intel’s Coffee Lake generation, launched on October 4, 2017, and now marked as end-of-life. It is built on Intel’s 14 nm process node with a die size of 126 mm², and it features four physical cores with four threads, a base clock of 4.00 GHz, and a TDP of 91 W. The processor carries a launch MSRP of $168, includes an unlocked multiplier, and integrates UHD Graphics 630. Its average benchmark score is 1997, placing it at the 46th percentile among all CPUs, which indicates a mid-pack standing in the broader performance hierarchy.

Platform and Compatibility

The Core i3-8350K uses the Intel Socket 1151 interface, pairing with motherboards designed for that socket. The architecture is Coffee Lake, which is the same generation as the Core i3 family to which this chip belongs. Memory support is limited to DDR4, operating via a dual-channel memory bus, with a peak memory bandwidth of 38.4 GB/s. Notably, the processor supports ECC memory, a feature more commonly associated with workstation or server platforms, though its desktop orientation makes this an atypical inclusion for a mainstream quad-core part.

For expansion, the CPU provides PCIe Gen 3 with 16 lanes available from the processor itself. This allocation is standard for a single graphics card setup, leaving no additional CPU-attached lanes for extra devices. The integrated graphics solution is UHD Graphics 630, which handles basic display output without a discrete GPU. The socket and chipset compatibility indicate a clear upgrade path within the Coffee Lake family, but the end-of-life status means no future firmware or platform support is planned from Intel. The 14 nm process node and 126 mm² die size are modest by modern standards, but they define the physical constraints of this part.

Who Should Consider It

The benchmark data positions this processor as a capable entry-level desktop solution, but its suitability varies sharply by workload. For gaming, the four cores and four threads, combined with a 4.00 GHz base clock (no boost clock is listed), deliver single-thread performance that is competitive for older or less multithreaded titles. The Cinebench R23 single-core score of 824 and Geekbench single-core score of 1506 suggest that tasks relying on one or two threads will see responsive performance. However, the lack of Hyper-Threading means that modern games increasingly utilizing more than four threads will not scale well, as the multi-core scores indicate a hard ceiling.

For content creation and office workloads, the picture is more limited. The Cinebench R23 multi-core score of 5837 and Geekbench multi-core score of 4342 show that heavily threaded applications, such as video rendering or 3D modeling, will lag behind processors with more cores or threading capabilities. Office productivity, which often involves light multitasking across several applications, is adequately served by the four cores, but the 46th percentile ranking relative to all CPUs signals that it will not excel in intense parallel tasks. The 91 W TDP and unlocked multiplier make it an interesting candidate for users who overclock, but the physical core count remains the limiting factor. This processor is best suited for budget-conscious builders targeting single-threaded or lightly threaded workloads, where its clock speed and integrated graphics provide a balanced baseline.

Benchmark Performance

The benchmark results from Cinebench and Geekbench reveal a consistent pattern: the i3-8350K is a strong single-thread performer relative to its multi-thread output. In Cinebench R15, it scores 588 points in multi-core and 83 points in single-core. The R20 version shows 2451 multi-core and 346 single-core, while R23 produces 5837 multi-core and 824 single-core. Geekbench reports 4342 multi-core and 1506 single-core. These numbers, when viewed together, show a roughly 7:1 ratio between multi-core and single-core scores across all tests, which is expected for a four-core, four-thread design without additional parallelism.

Comparing to its nearest rivals, the data shows a razor-thin margin. The Intel Core i5-8400T has an average score of 1996, which is exactly 0% different from the i3-8350K’s 1997 average. The Intel Core i3-10305T scores 2000, putting it 0.1% ahead of the 8350K. The AMD Ryzen 7 2800H averages 2002, a 0.2% advantage, and the Intel Core i7-7920HQ reaches 2004, which is 0.3% higher. These deltas are negligible in real-world terms, but they do establish that the 8350K sits at the bottom of this immediate cluster, albeit by less than half a percent in every case. The percentile ranking of 46 reinforces this middling position, neither a standout nor a laggard.

In absolute terms, the multi-core scores indicate that the processor’s performance is adequate for basic tasks but not for heavy parallel workloads. The single-core scores, however, are respectable, and the 4.00 GHz base clock (with no boost) suggests that the chip runs at a fixed high frequency, which benefits latency-sensitive applications. The data does not show any thermal or power throttling behavior, but the 91 W TDP implies that sustained all-core loads will generate meaningful heat that requires a capable air cooler.

How It Compares

Against the Intel Core i5-8400T, the i3-8350K is effectively tied, with the i5-8400T posting an average score of 1996 versus 1997, a 0% delta. This parity is notable because the i5-8400T is a lower-power variant, yet the performance difference is nonexistent in aggregate benchmarks. The 8350K’s higher base clock likely offsets the i5-8400T’s additional cores (though core counts are not listed in the rival data), resulting in identical averages.

The Intel Core i3-10305T is a newer-generation part, and its average score of 2000 edges out the 8350K by 0.1%. This marginal gap suggests that generational improvements have not translated into meaningful gains for this class of processor, and the 8350K remains competitive despite its older architecture. The 10305T’s slight lead could stem from efficiency or microarchitectural refinements, but the delta is within noise.

The AMD Ryzen 7 2800H, a mobile-oriented chip, scores 2002, which is 0.2% ahead of the 8350K. That this desktop processor is beaten by a notebook part is a signal of how tight the mid-range landscape is, but the difference is so small that it would not be perceptible in everyday use. The Ryzen 7 2800H’s higher average may reflect better multi-thread scaling, but the 8350K’s single-thread performance likely keeps the gap narrow.

The Intel Core i7-7920HQ, a high-end mobile processor from a previous generation, achieves an average score of 2004, 0.3% above the 8350K. This places the 8350K at the bottom of its immediate rival group, but the margin is under half a percent across the board. In practical terms, any of these four processors would deliver nearly identical aggregate performance, and the 8350K’s distinction lies in its desktop socket and unlocked multiplier rather than its raw score.

Single-Thread vs Multi-Thread Behavior

The split between single-thread and multi-thread scores is the defining characteristic of this processor. In Cinebench R23, the single-core score is 824, while the multi-core score is 5837, yielding a ratio of approximately 7.08. This is precisely what a four-core, four-thread chip with no simultaneous multithreading should produce, the multi-core score is nearly a linear multiple of the single-core score, with only minor overhead. The Geekbench numbers show a similar pattern: 1506 single-core versus 4342 multi-core, a ratio of 2.88, which is lower than the Cinebench ratio because Geekbench’s multi-core test does not scale perfectly with core count.

For real-world workloads, this means that applications with strong single-thread dependencies, such as legacy games, web browsing, or spreadsheet calculations, will perform close to what the 4.00 GHz clock suggests. The processor’s fixed base clock, without a boost, ensures consistent performance without frequency variability. However, any workload that scales across multiple cores will hit a hard wall at four threads. Video encoding, compiling, or 3D rendering will use all four cores, but the lack of additional threads means the processor cannot hide latency or overlap operations as effectively as a six-core or eight-core part with Hyper-Threading.

The 38.4 GB/s memory bandwidth and dual-channel DDR4 support are sufficient for four cores, but they do not provide the headroom needed for more demanding memory-intensive tasks. The ECC memory support is a unique feature for this class, suggesting that the processor was positioned for entry-level workstations where data integrity matters, yet its core count limits its appeal in such roles. The single-thread advantage is clear, but the multi-thread ceiling is equally clear, making the i3-8350K a specialized tool rather than a general-purpose workhorse. Its 46th percentile ranking reflects this asymmetry, it outperforms many older parts in single-core, but falls behind in multi-core, landing it in the middle of the overall distribution.