Intel Core i5-13400T vs Intel Core i9-7900X Comparison

The Intel Core i5-13400T and the Intel Core i9-7900X represent two very different approaches to desktop computing, separated by six years of architectural evolution. The i5-13400T is a modern, power-sipping Raptor Lake part, while the i9-7900X is a high-power Skylake-X flagship from 2017. The benchmark data reveals a fascinating split: the older i9-7900X retains a narrow lead in Cinebench workloads, but the newer i5-13400T dominates in Geekbench, particularly in single-threaded performance. This creates a nuanced picture where the "best" choice depends entirely on the application, with the i5-13400T's architectural efficiency proving decisive in some areas despite its lower core count.

FAQ

Q: Which processor has more threads?

A: The Intel Core i9-7900X has 20 threads, while the Intel Core i5-13400T has 16 threads. Both have 10 physical cores.

Q: What is the difference in their average benchmark scores?

A: The Intel Core i5-13400T has an average benchmark score of 5210, which is 1.8% higher than the i9-7900X's 5120. This places the i5-13400T slightly ahead on average, despite the i9-7900X winning more individual head-to-head tests.

Q: How does the i9-7900X perform in Cinebench R23 multi-core?

A: The i9-7900X scores 17680 in Cinebench R23 multi-core, outperforming the i5-13400T's 17029 by 3.7%. This is the largest Cinebench margin for the older chip.

Q: What is the i5-13400T's biggest advantage?

A: The i5-13400T wins Geekbench single-core by a significant 32.2%, scoring 1899 versus the i9-7900X's 1437. Its Geekbench multi-core advantage is 15.7%, with scores of 10227 and 8841 respectively.

Q: Are both processors still in production?

A: No. The Intel Core i5-13400T is listed as Active, while the Intel Core i9-7900X is marked as End-of-life.

Q: Do these CPUs have integrated graphics?

A: Yes, the i5-13400T includes UHD Graphics 730. The i9-7900X has no integrated graphics, requiring a discrete GPU for display output.

Architecture Differences

The two chips are products of fundamentally different design eras. The i5-13400T is built on Intel's 10 nm process node, while the i9-7900X uses the older 14 nm node. This node difference is a primary driver of their divergent characteristics. The i5-13400T belongs to the Raptor Lake-S family, a mature iteration of Intel's hybrid architecture, whereas the i9-7900X is part of the Skylake-X line, a high-core-count enthusiast platform.

Cache hierarchies differ substantially. The i5-13400T allocates 80 KB of L1 cache and 1.25 MB of L2 cache per core, with a shared 20 MB L3 cache. The i9-7900X uses 64 KB of L1 and 1 MB of L2 per core, but its shared L3 cache is only 14 MB. This smaller pool of shared cache on the i9-7900X could impact performance in cache-sensitive workloads.

Memory support also marks a generational split. The i5-13400T supports both DDR4 and DDR5 memory in a dual-channel configuration. The i9-7900X supports only DDR4, but it utilizes a quad-channel memory bus with a rated bandwidth of 85.3 GB/s. This gives the older chip a theoretical memory bandwidth advantage, though the newer chip's support for faster DDR5 modules is a significant feature.

PCIe connectivity is another differentiator. The i5-13400T offers Gen 5 with 20 lanes, while the i9-7900X provides Gen 3 with 44 lanes. The newer standard offers higher per-lane bandwidth, which is beneficial for modern GPUs and NVMe drives. The i9-7900X's higher lane count is suited for multi-GPU setups or heavy expansion. The i5-13400T has an unlocked multiplier disabled, while the i9-7900X has an unlocked multiplier, enabling overclocking. Finally, the i5-13400T integrates UHD Graphics 730, a feature entirely absent from the i9-7900X.

Where Each One Wins

The Intel Core i9-7900X is the clear winner in the Cinebench suite, which is a proxy for lengthy, multi-threaded rendering workloads. It takes all six Cinebench tests, with consistent margins of 3.6% to 3.7% across both single-core and multi-core variants. This suggests that the i9-7900X's higher base and boost clocks, combined with its 20 threads, give it a sustained advantage in CPU-bound rendering tasks. Its 140W TDP and quad-channel memory bandwidth are likely contributors to this performance in prolonged workloads.

The Intel Core i5-13400T wins decisively in Geekbench, which often reflects more varied, mixed workloads including shorter bursts and memory-latency-sensitive tasks. Its 32.2% single-core advantage is the largest performance gap in the entire comparison. This indicates that the Raptor Lake architecture has a significant IPC (instructions per clock) advantage over Skylake-X. The i5-13400T is the better choice for applications that are primarily single-threaded or lightly threaded, where its modern core design can shine. Its 15.7% multi-core win in Geekbench also shows that for certain types of multi-threaded tasks, the newer architecture's efficiency overcomes the i9-7900X's thread count advantage.

Specification Differences

The most striking difference is in power consumption. The i5-13400T has a TDP of 35W, while the i9-7900X has a TDP of 140W. This is a four-fold difference that impacts everything from cooling requirements to system power supply needs. The i5-13400T is a low-power chip designed for efficiency, while the i9-7900X is a high-performance part that demands robust cooling.

Clock speeds also differ, with the i9-7900X having a higher base clock of 3.30 GHz and boost clock of 4.50 GHz, compared to the i5-13400T's 1.30 GHz base and 4.40 GHz boost. The i5-13400T's low base clock is a key factor in its low TDP. The i9-7900X's higher base clock contributes to its Cinebench wins. Thread counts differ as well, with the i9-7900X offering 20 threads versus the i5-13400T's 16, despite both having 10 cores.

The memory support is a major differentiator: the i5-13400T supports DDR4 and DDR5 in dual-channel mode, while the i9-7900X supports only DDR4 in quad-channel mode. The i9-7900X has a rated memory bandwidth of 85.3 GB/s. The socket and platform are entirely different, with the i5-13400T using Intel Socket 1700 and the i9-7900X using Intel Socket 2066. PCIe support differs, with the i5-13400T offering Gen 5 with 20 lanes and the i9-7900X offering Gen 3 with 44 lanes. The i5-13400T has integrated graphics, while the i9-7900X does not. Finally, the i9-7900X has an unlocked multiplier, whereas the i5-13400T does not.

Head-to-Head Benchmarks

The head-to-head data shows a clear split between the Cinebench and Geekbench suites. The i9-7900X wins all six Cinebench tests, but the margins are extremely narrow. In Cinebench R15 multi-core, the i9-7900X scores 1782 against the i5-13400T's 1716, a 3.7% lead. The single-core test shows a similar story: 251 versus 242, a 3.6% advantage for the i9-7900X. This pattern repeats in Cinebench R20 and R23, with the i9-7900X holding a steady 3.7% edge in both multi-core and single-core tests. For example, in Cinebench R23 multi-core, the i9-7900X scores 17680 versus 17029 for the i5-13400T, and in single-core, it scores 2496 versus 2404.

The Geekbench results paint a completely different picture. The i5-13400T wins Geekbench single-core with a score of 1899, a massive 32.2% improvement over the i9-7900X's 1437. This is the largest delta in the entire comparison. In Geekbench multi-core, the i5-13400T scores 10227, which is 15.7% higher than the i9-7900X's 8841.

These results suggest that the i9-7900X's advantage in Cinebench is likely due to its higher clocks and additional threads, which help in sustained, heavily multi-threaded rendering. However, the i5-13400T's modern architecture gives it a commanding lead in Geekbench's workload, which may be more sensitive to cache latency, branch prediction, and other architectural improvements. The i5-13400T's 32.2% single-core victory is particularly telling, as it indicates that for everyday tasks and lightly threaded applications, the newer chip is dramatically faster. The i9-7900X wins 6 out of 8 benchmarks, but the i5-13400T's wins are by much larger margins, resulting in a higher average benchmark score for the newer chip.