Intel Core i5-9400T

The Intel Core i5-9400T is an end-of-life desktop processor built on the Coffee Lake architecture, utilizing a 14 nm process node. It offers six physical cores and six threads, with a base clock of 1.80 GHz and a boost clock of 3.40 GHz. This CPU sits at the 48th percentile of all processors in the benchmark database, indicating it is positioned squarely in the mid-range performance tier. Its average benchmark score of 2157 places it in a tightly contested group, with its nearest rivals all scoring within a narrow band of roughly 2143 to 2164.

Who Should Consider It

The workload profile of the Core i5-9400T is defined by its six cores and modest clock speeds, making it a reasonable fit for users whose primary tasks are general productivity and light-to-moderate content creation. In multi-threaded workloads, the processor demonstrates adequate capability, as seen in its Cinebench R23 multi-core score of 6993. This suggests that users engaged in occasional video rendering or batch photo processing will find it serviceable, though not exceptional. The data indicates that for office applications, spreadsheet manipulation, and web-based tasks, the single-core performance of 987 in Cinebench R23 is sufficient to ensure responsive daily operation.

For gaming, the i5-9400T presents a mixed picture. The six-core configuration is adequate for modern game titles that utilize multiple threads, and the integrated UHD 630 graphics provide a fallback for systems without a discrete GPU. However, the relatively low boost clock of 3.40 GHz will limit frame rates in CPU-bound scenarios compared to higher-clocked rivals. Benchmark results show the single-core Geekbench score is 1152, which is below the threshold for high-refresh-rate gaming. This processor is best suited for a budget gaming build paired with a mid-range discrete graphics card, targeting 1080p at standard refresh rates, rather than for competitive esports at maximum frame rates.

Users who require heavy multi-threaded processing, such as professional 3D rendering or complex scientific simulations, should look elsewhere. The multi-core performance, while respectable for its class, is outpaced by processors with higher thread counts. The data shows the processor is closely matched with the Intel Core i5-10200H, which has a deltaPct of only 0.1, meaning the two are virtually identical in average score. This suggests the i5-9400T is a viable option for users who need a balanced desktop processor for mixed use, but it will not excel in any single demanding workload category.

Power and Thermals

The Core i5-9400T carries a 35 W TDP class, which is a defining characteristic of this processor. This low thermal design power is the primary reason it is suitable for compact desktop systems and small form factor builds where cooling is constrained. The 35 W TDP implies that a stock air cooler, even a slim low-profile model, is sufficient to maintain stable operation under sustained loads. The processor's base clock of 1.80 GHz is low, but this is an intentional design trade-off to keep power consumption and heat generation minimal.

The thermal behavior of the i5-9400T is governed by its power envelope rather than its peak performance. Under heavy multi-threaded loads, the processor will boost to 3.40 GHz, but it may not sustain this frequency indefinitely depending on the motherboard's power limits and cooling solution. The 14 nm process node is mature, and the six-core layout with a shared 9 MB L3 cache does not present extreme thermal density. For system integrators and DIY builders, this processor simplifies cooling design, allowing for quieter operation with smaller heatsinks compared to higher-TDP desktop parts. The lack of an unlocked multiplier means no overclocking headroom, so thermal requirements remain predictable and fixed by the stock specifications.

Benchmark Performance

The benchmark data reveals a processor that is highly consistent in its performance positioning. The Cinebench R20 multi-core score of 2937 and single-core score of 414 show a multi-to-single ratio of approximately 7.1, which is typical for a six-thread part. In Cinebench R23, the multi-core score of 6993 and single-core score of 987 reinforce this pattern. The Geekbench results show a multi-core score of 3969 and single-core score of 1152, providing a broader view of system-level performance that includes memory subsystem behavior.

Comparing to its nearest rivals, the i5-9400T is in a virtual dead heat. The average score of 2157 is 0.1% higher than the Intel Core i5-10200H, which scores 2155. This negligible delta means that in most applications, the two processors will be indistinguishable. Against the Intel Core i5-7640X, which scores 2161, the i5-9400T is 0.2% slower, again a margin that is well within run-to-run variance. The AMD Ryzen 5 2400G scores 2143, making the i5-9400T 0.7% faster. These sub-one-percent differences indicate that the i5-9400T is positioned in an extremely competitive performance band, where no single processor holds a meaningful advantage.

The single-core performance tells a more telling story. In Cinebench R23 single-core, the score of 987 places it behind many modern desktop parts, but it is sufficient for basic responsiveness. The Cinebench R15 single-core score of 99 is notably low, reflecting the sub-2.0 GHz base clock. However, the boost clock of 3.40 GHz helps close the gap in short bursts. The multi-core performance in Cinebench R15 is 704, which shows that the processor scales reasonably well across all six cores, but the absolute score is limited by the clock speed. Overall, the benchmark results indicate that the i5-9400T delivers predictable, mid-range performance that is well-matched to its power envelope.

FAQ

Q: Does the Intel Core i5-9400T support ECC memory?

A: No, the FACT PACK indicates that ECC memory support is false.

Q: What is the memory bandwidth of this processor?

A: The processor supports dual-channel DDR4 memory with a maximum bandwidth of 42.7 GB/s.

Q: How many PCIe lanes does the CPU provide?

A: The processor offers 16 PCIe Gen 3 lanes from the CPU only, which is standard for a desktop part.

Q: What is the integrated graphics solution?

A: The processor includes Intel UHD 630 integrated graphics, which can handle basic display output and light graphical tasks.

Q: Is the multiplier unlocked for overclocking?

A: No, the multiplier is locked, meaning the processor cannot be overclocked.

Q: What is the release date of this processor?

A: The release date for the Intel Core i5-9400T was 2018-08-31.

Single-Thread vs Multi-Thread Behavior

The split between single-thread and multi-thread performance in the i5-9400T is characteristic of a six-core processor with a modest frequency ceiling. The single-core scores across all benchmarks are low by modern standards, with a Cinebench R23 score of 987 and a Geekbench score of 1152. This indicates that the processor will feel slightly less snappy in lightly-threaded applications such as web browsers, document editors, and older games that rely heavily on one or two cores. The base clock of 1.80 GHz is the primary culprit, though the boost to 3.40 GHz mitigates this in short-duration tasks.

In contrast, the multi-threaded scores are comparatively stronger. The Cinebench R23 multi-core score of 6993 is over seven times the single-core score, which is a healthy scaling factor for six physical threads. This means that workloads which can utilize all six cores, such as video encoding, 3D rendering, and file compression, will see the processor perform closer to its full potential. The Geekbench multi-core score of 3969 is roughly 3.4 times the single-core score, reflecting less-than-ideal scaling in this benchmark, but the trend is consistent.

For real-world usage, this behavior translates to a processor that excels in multi-tasking environments where multiple applications are running simultaneously. The six cores allow background tasks to proceed without stalling the foreground application. However, for tasks that are inherently single-threaded, such as many legacy applications or certain game engines, the i5-9400T will underperform compared to processors with higher clock speeds. The data suggests that users should prioritize multi-threaded workloads when considering this processor, as its single-thread performance is its weakest attribute. The balanced multi-core output, in line with its rivals, makes it a solid choice for a general-purpose desktop where no single workload dominates.