Intel Core i5-11400T vs Intel Core i7-7800X Comparison

The Intel Core i7-7800X and Intel Core i5-11400T are both six-core, twelve-thread desktop processors, but they target fundamentally different platforms and use cases. The benchmark data indicates that the i5-11400T is the more consistent performer in most tests, winning seven out of eight head-to-head comparisons, while the i7-7800X claims a single, decisive victory in Geekbench multicore. The i7-7800X’s overall average benchmark score is 3333, placing it in the 54th percentile of all CPUs, while the i5-11400T’s average score is 3309, also in the 54th percentile. The two are effectively tied in overall compute capability, with a deltaPct of just 0.7% in favor of the i7-7800X.

The Verdict

The data supports a clear split: the Intel Core i5-11400T is the superior choice for most general-purpose and single-threaded workloads, while the Intel Core i7-7800X is the pick only if you specifically need its unique platform advantages or its Geekbench multicore strength. The i5-11400T wins every Cinebench test (R15, R20, R23) in both single-core and multi-core, by a consistent margin of 0.6% in each case. It also wins Geekbench single-core decisively, scoring 1597 versus the i7-7800X’s 1352, a 15.3% advantage. For users running typical productivity apps, web browsing, or lightly threaded software, the i5-11400T delivers better per-core performance.

However, the i7-7800X is not without its merits. It wins Geekbench multicore with a score of 6144 versus 5591 for the i5-11400T, a substantial 9.9% lead. This suggests that in certain multi-threaded workloads, particularly those that scale well with memory bandwidth or the specific architecture, the i7-7800X can pull ahead. Furthermore, the i7-7800X offers a quad-channel memory bus and 28 PCIe Gen 3 lanes, while the i5-11400T is limited to dual-channel memory and 20 PCIe Gen 4 lanes. If your workflow depends on high memory throughput or extensive PCIe expansion, the i7-7800X’s platform is objectively more capable, despite its lower benchmark scores elsewhere. The i7-7800X also has an unlocked multiplier, allowing for overclocking, whereas the i5-11400T is locked. Given the i5-11400T’s sweep in Cinebench and Geekbench single-core, it is the default recommendation for most buyers, with the i7-7800X reserved for those who need its specific I/O and memory features.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i7-7800X has an average benchmark score of 3333, compared to 3309 for the Intel Core i5-11400T. This gives the i7-7800X a marginal 0.7% lead in overall average performance.

Q: How do the two compare in Cinebench R23 multi-core?

A: The Intel Core i5-11400T scores 11113 in Cinebench R23 multi-core, while the Intel Core i7-7800X scores 11044. The i5-11400T wins by a margin of 0.6%.

Q: Is there any benchmark where the i7-7800X wins?

A: Yes, the i7-7800X wins Geekbench multicore with a score of 6144, compared to 5591 for the i5-11400T. This represents a 9.9% advantage for the i7-7800X.

Q: What is the difference in memory bandwidth support?

A: The i7-7800X supports a quad-channel memory bus with a theoretical bandwidth of 76.8 GB/s, whereas the i5-11400T uses a dual-channel bus with a bandwidth of 51.2 GB/s.

Q: Do these CPUs have integrated graphics?

A: No, the Intel Core i7-7800X does not have integrated graphics. The Intel Core i5-11400T includes integrated graphics, specifically the UHD Graphics 730.

Q: Which processor has a higher boost clock?

A: The Intel Core i7-7800X has a boost clock of 4.00 GHz, which is higher than the Intel Core i5-11400T’s boost clock of 3.70 GHz. However, the i5-11400T still wins all single-core benchmark tests.

Architecture Differences

The two processors are built on fundamentally different architectures despite both using a 14 nm process node from Intel. The i7-7800X is based on the Skylake-X architecture (codename Skylake-X), part of the Core i7 X-Series 7th Generation. In contrast, the i5-11400T uses the Rocket Lake architecture (codename Rocket Lake), belonging to the Core 11th Gen family. This architectural gap explains why the newer i5-11400T, despite a much lower base clock, achieves better single-core performance.

The cache hierarchies differ significantly. The i7-7800X has 64 KB of L1 cache per core and 1 MB of L2 cache per core, with a shared 8.25 MB L3 cache. The i5-11400T has 80 KB of L1 cache per core and 512 KB of L2 cache per core, but a larger shared 12 MB L3 cache. The larger L3 cache on the i5-11400T likely contributes to its better performance in latency-sensitive tasks, while the i7-7800X’s larger per-core L2 cache is a characteristic of the older Skylake-X design.

The memory controllers are a major architectural divergence. The i7-7800X features a quad-channel memory bus, providing a theoretical bandwidth of 76.8 GB/s, while the i5-11400T is limited to a dual-channel bus with 51.2 GB/s. Additionally, the PCIe support differs: the i7-7800X offers 28 PCIe Gen 3 lanes (CPU only), whereas the i5-11400T provides 20 PCIe Gen 4 lanes. The i5-11400T also integrates UHD Graphics 730, which the i7-7800X lacks entirely. The i7-7800X has an unlocked multiplier, while the i5-11400T is locked, and the i7-7800X uses the Intel Socket 2066 platform, while the i5-11400T uses Intel Socket 1200.

Specification Differences

The most obvious specification difference is the base clock: the i7-7800X runs at 3.50 GHz, while the i5-11400T has a base clock of 1300.00 MHz (1.30 GHz). The boost clocks are closer, with the i7-7800X reaching 4.00 GHz and the i5-11400T reaching 3.70 GHz. The thermal design power (TDP) is drastically different: the i7-7800X has a 140 W TDP, while the i5-11400T is rated at only 35 W, reflecting a much more power-efficient design.

The socket and platform are incompatible. The i7-7800X uses Intel Socket 2066, while the i5-11400T uses Intel Socket 1200. The i7-7800X supports quad-channel DDR4 memory, whereas the i5-11400T supports dual-channel DDR4. The i7-7800X offers 28 PCIe Gen 3 lanes, while the i5-11400T offers 20 PCIe Gen 4 lanes. The i5-11400T includes integrated graphics (UHD Graphics 730), while the i7-7800X has none. The i7-7800X has an unlocked multiplier for overclocking, but the i5-11400T does not. The die size also differs, with the i5-11400T measuring 276 mm², while the i7-7800X’s die size is not specified in the data. Finally, the i7-7800X was released in June 2017, while the i5-11400T was released in March 2021, and both are end-of-life products.

Head-to-Head Benchmarks

The benchmark results paint a picture of near-total dominance for the i5-11400T in Cinebench and single-core tests, with a single major reversal in Geekbench multicore. In Cinebench R15 multi-core, the i5-11400T scores 1120 versus 1113 for the i7-7800X, a 0.6% win. The single-core R15 test is equally close: 157 for the i5-11400T and 156 for the i7-7800X, again a 0.6% margin. This pattern repeats in Cinebench R20, where the i5-11400T scores 4667 multi-core and 658 single-core, versus 4638 and 654 for the i7-7800X, respectively, with identical 0.6% deltas.

Cinebench R23 continues the trend, with the i5-11400T posting 11113 multi-core and 1569 single-core, compared to 11044 and 1559 for the i7-7800X. The i5-11400T’s lead in these tests is consistent but small, around 0.6%, indicating that the two chips are closely matched in raw rendering workloads. However, the Geekbench results tell a different story. In Geekbench single-core, the i5-11400T wins decisively with 1597 versus 1352, a 15.3% advantage that highlights the i5-11400T’s superior IPC from the newer Rocket Lake architecture. In Geekbench multicore, the i7-7800X strikes back, scoring 6144 versus 5591 for the i5-11400T, a substantial 9.9% win. This is the only benchmark where the i7-7800X comes out ahead, but the margin is significant and suggests a different scaling behavior under Geekbench’s specific multi-threaded test.

Where Each One Wins

The Intel Core i5-11400T is the winner for single-threaded performance and for most multi-threaded rendering tasks. It wins all Cinebench R15, R20, and R23 tests, both single-core and multi-core, by a 0.6% margin. It also wins Geekbench single-core by a huge 15.3%, making it the clear choice for everyday applications, office work, and any software that relies heavily on single-core speed. Its 35 W TDP and integrated UHD Graphics 730 also make it a much more power-efficient and self-contained option, suitable for compact or low-power builds without a discrete GPU.

The Intel Core i7-7800X wins only in Geekbench multicore, with a 9.9% lead over the i5-11400T. This indicates that in certain multi-threaded workloads, the i7-7800X’s platform advantages—specifically its quad-channel memory bus providing 76.8 GB/s of bandwidth, compared to 51.2 GB/s for the i5-11400T—can be leveraged to pull ahead. Additionally, the i7-7800X offers 28 PCIe Gen 3 lanes versus 20 PCIe Gen 4 lanes, which may be preferable for users with multiple expansion cards or NVMe drives. The unlocked multiplier is another point in its favor for enthusiasts willing to overclock, though the data does not show the overclocked results. For users who need maximum memory bandwidth or extensive PCIe connectivity, the i7-7800X is the better choice, despite its loss in most benchmark tests.