Intel Core i3-9100E vs Intel Core i5-6600T Comparison

FAQ

Q: How does the Intel Core i3-9100E compare to the Intel Core i5-6600T in raw multi-core performance?

A: The i3-9100E wins every recorded multi-core benchmark by a consistent margin. In Cinebench R23 multi-core, it scores 5,549 versus 4,745 for the i5-6600T, a 16.9% advantage. The same pattern holds in Cinebench R15 (559 vs. 478, 16.9%) and R20 (2,330 vs. 1,992, 17%).

Q: Which processor has the higher clock speeds?

A: The i3-9100E runs at a 3.10 GHz base clock and a 3.70 GHz boost clock. The i5-6600T is slower on both counts, with a 2.70 GHz base and a 3.50 GHz boost. The i3's higher clocks directly contribute to its lead in single-threaded tests.

Q: Do both CPUs have the same core and thread configuration?

A: Yes, both are 4-core, 4-thread parts. Neither supports Hyper-Threading. The performance difference is therefore driven by architectural improvements and clock speeds, not by a difference in core count.

Q: Are these processors comparable in power draw?

A: Not at all. The i5-6600T has a 35 W TDP, making it a low-power part. The i3-9100E is rated at 65 W TDP, nearly double. The i5 is clearly designed for thermally constrained systems, while the i3 trades power for higher peak performance.

Q: What about memory support?

A: The i5-6600T supports both DDR3 and DDR4, while the i3-9100E supports DDR4 only. The i3 has a higher memory bandwidth rating at 38.4 GB/s versus 34.1 GB/s for the i5. The i3 also supports ECC memory, while the i5 does not.

Q: Which CPU has the higher average benchmark score?

A: The i3-9100E averages 1,605 points across its benchmark suite, placing it in the 39th percentile of all CPUs. The i5-6600T averages 1,563 points, also in the 39th percentile. The i3 is about 2.7% ahead in this composite metric.

Architecture Differences

The two processors belong to different Intel microarchitectures, despite sharing the same 14 nm process node and the same Intel Socket 1151. The i3-9100E is built on Coffee Lake, a refinement of the Skylake architecture that powers the i5-6600T. The i5 uses the original Skylake design, released in mid-2015, while the i3 comes from the Coffee Lake Refresh generation, launched in late August 2018.

The die sizes tell part of the story. The i5-6600T has a larger die at 177 mm², while the i3-9100E is smaller at 126 mm². This reflects the different transistor layouts and integrated components. Both use the 14 nm manufacturing process from Intel, but the newer Coffee Lake design achieves higher efficiency and clock speeds within a smaller area.

Cache configurations are identical: each core has 64 KB of L1 and 256 KB of L2, with a shared 6 MB L3 cache. The key architectural differences lie elsewhere. The i3-9100E features the UHD Graphics 630 integrated GPU, while the i5-6600T ships with the older UHD Graphics 530. Both are integrated graphics solutions, but the 630 generation provides a newer feature set.

Memory support differs significantly. The i3-9100E supports only DDR4, running on a dual-channel bus with a theoretical bandwidth of 38.4 GB/s. The i5-6600T is more flexible, supporting both DDR3 and DDR4, but its DDR4 bandwidth is lower at 34.1 GB/s. ECC memory is supported on the i3-9100E but not on the i5-6600T, making the i3 more attractive for entry-level server or workstation builds.

Both CPUs use Gen 3 PCIe with 16 lanes from the CPU, a standard desktop configuration. Neither has an unlocked multiplier, so overclocking is not officially supported on either part. The production status for both is end-of-life, though the i5 was released three years earlier.

Where Each One Wins

The benchmark data shows a clean sweep: the i3-9100E wins all six recorded head-to-head tests, with zero wins for the i5-6600T. This makes the use-case split straightforward, though the margins reveal nuance.

The i3-9100E is the clear choice for any workload that depends on raw CPU throughput. Its 16.9% to 17.1% advantage across Cinebench R15, R20, and R23, in both single-core and multi-core tests, means it handles rendering, video encoding, and general productivity tasks with noticeably better performance. The higher base and boost clocks (3.10/3.70 GHz vs. 2.70/3.50 GHz) give it a consistent edge in single-threaded applications, which is critical for older software or lightly threaded games.

The i5-6600T, despite losing every benchmark, still has a role. Its 35 W TDP makes it a superior fit for small form factor systems, fanless builds, or any scenario where power draw and heat output are the primary constraints. The i3's 65 W TDP requires more robust cooling and a larger power delivery budget. For embedded or always-on systems where performance per watt matters more than peak speed, the i5 is the more sensible choice.

The i5 also offers broader memory compatibility. Its support for both DDR3 and DDR4 means it can slot into older motherboards or leverage existing DDR3 memory, potentially reducing upgrade costs in legacy systems. The i3's DDR4-only limitation is a minor constraint, but it aligns with modern platform expectations.

Specification Differences

The two CPUs differ in several key specifications, despite sharing core count, thread count, socket, process node, and L3 cache size.

• Base Clock: i3-9100E at 3.10 GHz, i5-6600T at 2.70 GHz
• Boost Clock: i3-9100E at 3.70 GHz, i5-6600T at 3.50 GHz
• TDP: i3-9100E at 65 W, i5-6600T at 35 W
• Die Size: i3-9100E at 126 mm², i5-6600T at 177 mm²
• Memory Support: i3-9100E supports DDR4 only; i5-6600T supports DDR3 and DDR4
• Memory Bandwidth: i3-9100E at 38.4 GB/s, i5-6600T at 34.1 GB/s
• ECC Memory: i3-9100E supports it, i5-6600T does not
• Integrated Graphics: i3-9100E uses UHD Graphics 630, i5-6600T uses UHD Graphics 530
• Release Date: i3-9100E launched August 31, 2018; i5-6600T launched July 1, 2015
• Launch MSRP: i3-9100E at $122, i5-6600T at $213

The release date gap of over three years explains the architectural jump from Skylake to Coffee Lake. The i3's newer design delivers higher clocks and better memory bandwidth while using a smaller die, a clear sign of process maturity and design optimization. The i5 retains advantages only in power efficiency and memory flexibility.

Head-to-Head Benchmarks

The head-to-head results are unambiguous: the i3-9100E wins all six tests, with margins ranging from 16.4% to 17.1%. There is no overlap in scores, no test where the i5 pulls ahead, and no scenario where the two trade places.

Starting with multi-core performance, the i3-9100E scores 559 in Cinebench R15 multi-core versus 478 for the i5-6600T, a 16.9% lead. In Cinebench R20 multi-core, the i3 hits 2,330 against 1,992, a 17% edge. The gap persists in the newer Cinebench R23 multi-core test, where the i3 scores 5,549 and the i5 scores 4,745, again a 16.9% difference. These consistent margins across three generations of the Cinebench suite indicate that the i3's advantage is structural, not workload-dependent.

Single-core performance tells the same story with slightly different percentages. In Cinebench R15 single-core, the i3 scores 78 versus 67, a 16.4% win. Cinebench R20 single-core shows 328 versus 280, a 17.1% advantage. Cinebench R23 single-core follows with 783 versus 669, a 17% edge. The single-core margins are nearly identical to the multi-core ones, confirming that clock speed and IPC improvements benefit all thread counts equally.

The average benchmark scores reinforce this picture. The i3-9100E averages 1,605 points across its suite, while the i5-6600T averages 1,563 points, a roughly 2.7% gap. Both sit in the 39th percentile of all CPUs, meaning they are mid-pack parts overall, but the i3 is firmly ahead of its older rival.

Looking at the nearest rivals provides context. The i3-9100E's closest competitor is the Intel Xeon E3-1240L v5, which averages 1,609 points, a 0.2% delta. The i5-6600T's nearest rival is the Intel Core i3-8300, averaging 1,564 points, a 0.1% delta. This shows that both CPUs are competitive within their performance class, but the i3's absolute score is higher, placing it in a slightly faster tier of comparable processors.

In summary, the i3-9100E is the superior performer in every measurable benchmark, with a 16.4% to 17.1% advantage across the board. The i5-6600T's only real merits are its 35 W TDP and dual-generation memory support, which may matter in specific low-power or legacy applications. For anyone prioritizing speed, the i3 is the definitive winner. For those prioritizing efficiency, the i5 remains a viable option despite its lower scores.