Intel Core i5-11400T vs Intel Xeon E5-1680 v3 Comparison

The Intel Core i5-11400T and the Intel Xeon E5-1680 v3 represent two very different approaches to computing, separated by seven years of architectural evolution and aimed at distinct market segments. The data shows a surprisingly tight competition in raw compute benchmarks, despite the dramatic differences in their design philosophies. The i5-11400T is a modern, power-efficient 14 nm Rocket Lake desktop part, while the Xeon E5-1680 v3 is a 22 nm Haswell-EP server/workstation processor with more cores and a much higher power envelope. The benchmark results indicate that the Xeon edges out a narrow victory across every single test, but the context of how each chip achieves its scores—and what platform they require—tells a more nuanced story.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon E5-1680 v3 has 8 cores and 16 threads, while the Intel Core i5-11400T has 6 cores and 12 threads.

Q: How do they compare in single-core performance?

A: The Xeon E5-1680 v3 wins all single-core tests, but by very slim margins. In Cinebench R23 single-core, the Xeon scores 1593 versus the i5-11400T's 1569, a delta of -1.5% from the i5's perspective.

Q: What is the difference in thermal design power (TDP)?

A: The i5-11400T has a TDP of 35 watts, while the Xeon E5-1680 v3 has a TDP of 140 watts. This is a four-fold difference in the thermal envelope.

Q: Which processor supports ECC memory?

A: The Intel Xeon E5-1680 v3 supports ECC memory, while the Intel Core i5-11400T does not. This is a key feature for workstation and server reliability.

Q: What are the memory channel configurations?

A: The i5-11400T uses a dual-channel memory bus with 51.2 GB/s bandwidth, whereas the Xeon E5-1680 v3 uses a quad-channel bus with 68.3 GB/s bandwidth.

Q: Which processor has a higher benchmark percentile ranking?

A: The i5-11400T has a percentile of 54, slightly higher than the Xeon E5-1680 v3's percentile of 53, despite the Xeon winning their direct head-to-head matchups.

Architecture Differences

The architectural gap between these two CPUs is substantial. The Intel Core i5-11400T is built on Rocket Lake, a 14 nm process node, with a die size of 276 mm². In contrast, the Intel Xeon E5-1680 v3 uses the older Haswell-EP architecture on a 22 nm process node, with a significantly larger die size of 356 mm² and a transistor count of 2,600 million. This generational leap means the i5 achieves its performance with a much smaller, more efficient design.

Cache layouts differ notably. The i5-11400T allocates 80 KB of L1 and 512 KB of L2 per core, with a shared 12 MB L3 cache. The Xeon E5-1680 v3 provides 64 KB of L1 and 256 KB of L2 per core, but compensates with a larger 20 MB shared L3 cache. The larger L3 on the Xeon is a classic server trait, designed to hold more working data for intensive multi-threaded workloads.

Platform features diverge sharply. The i5-11400T uses the Intel Socket 1200 and supports PCIe Gen 4 with 20 lanes, while the Xeon E5-1680 v3 uses the Intel Socket 2011-3 and supports PCIe Gen 3 with 40 lanes. The Xeon also offers quad-channel DDR4 memory and ECC support, whereas the i5-11400T is limited to dual-channel non-ECC memory. The i5 includes integrated UHD Graphics 730, but the Xeon has no integrated graphics at all, requiring a discrete GPU for any display output.

Where Each One Wins

The benchmark data shows the Xeon E5-1680 v3 winning every single head-to-head test, but the margins are so small that the practical wins are situational. The Xeon's strongest showing is in multi-core tests, where its extra 2 cores and 4 threads provide a slight advantage. For example, in Cinebench R23 multi-core, the Xeon scores 11289 versus the i5's 11113, a lead of about 1.6%. This makes the Xeon a marginal winner for heavily threaded productivity tasks like 3D rendering or video encoding, where every bit of throughput counts.

The i5-11400T, however, wins in the broader context of platform efficiency and modern features. Its 35 W TDP makes it far more suitable for compact, low-power builds, and its support for PCIe Gen 4 offers faster connectivity for modern SSDs and GPUs. The i5 also has a higher percentile rank (54) than the Xeon (53), indicating that its average benchmark score places it slightly better among all CPUs. For users who prioritize a modern feature set, lower power consumption, and integrated graphics for basic display needs, the i5-11400T is the clear choice, even if it loses the raw compute matchups.

Specification Differences

The two processors differ in nearly every major specification category. The Intel Core i5-11400T offers 6 cores and 12 threads, with a base clock of 1300 MHz and a boost clock of 3.70 GHz. The Intel Xeon E5-1680 v3 offers 8 cores and 16 threads, with a base clock of 3.20 GHz and a boost clock of 3.80 GHz. The Xeon's clocks are higher across the board, but the i5 compensates with a much lower TDP of 35 watts versus the Xeon's 140 watts.

Process technology and physical characteristics differ significantly. The i5-11400T uses a 14 nm process with a 276 mm² die, while the Xeon E5-1680 v3 uses a 22 nm process with a 356 mm² die and 2,600 million transistors. Memory support also varies: both support DDR4, but the i5 uses dual-channel with 51.2 GB/s bandwidth, while the Xeon uses quad-channel with 68.3 GB/s bandwidth. The i5 supports up to 20 PCIe Gen 4 lanes, whereas the Xeon supports up to 40 PCIe Gen 3 lanes. ECC memory is supported only on the Xeon, and the i5 includes integrated UHD Graphics 730 while the Xeon has none. The i5 has a launch MSRP of $182, and its multiplier is locked, while the Xeon's multiplier is unlocked.

Head-to-Head Benchmarks

The head-to-head benchmark results are remarkably consistent, with the Xeon E5-1680 v3 winning all six tests by a narrow margin. In Cinebench R15 multi-core, the Xeon scores 1137 against the i5-11400T's 1120, a delta of -1.5%. The single-core R15 test shows a similar pattern: the Xeon scores 160 versus 157, a -1.9% delta. This pattern repeats in R20, where the Xeon wins multi-core 4741 to 4667 (-1.6%) and single-core 669 to 658 (-1.6%).

The most comprehensive test, Cinebench R23, confirms the trend. In multi-core, the Xeon scores 11289 versus the i5's 11113, a -1.6% delta. In single-core, the Xeon scores 1593 versus 1569, a -1.5% delta. Across all tests, the Xeon's average lead is just over 1.6%, which is a very tight margin. Interestingly, the i5-11400T has Geekbench scores of 5591 multi-core and 1597 single-core, but the Xeon lacks corresponding Geekbench data in the pack, so a direct comparison in that test is not possible. The data indicates that the Xeon's extra cores and higher clock speeds give it a consistent, albeit small, edge in Cinebench workloads.

The Verdict

The data presents a clear, if surprising, verdict: the Intel Xeon E5-1680 v3 is the marginally faster processor in raw compute benchmarks, winning all six head-to-head tests against the Intel Core i5-11400T. For users who need absolute maximum multi-threaded performance in Cinebench-style workloads, the Xeon's 8 cores and 16 threads provide a slight but consistent advantage, with scores leading by roughly 1.5% to 1.9% across R15, R20, and R23.

However, the i5-11400T is the more balanced choice for a modern desktop system. Its 35 W TDP makes it vastly more efficient than the Xeon's 140 W TDP, and it offers contemporary features like PCIe Gen 4, integrated graphics, and a smaller 14 nm process node. The Xeon's platform requires the older Socket 2011-3, includes no integrated graphics, and demands a higher power budget. The i5's higher percentile rank (54 vs 53) and its average benchmark score of 3309 versus the Xeon's 3265 suggest that, on a broader scale, the i5 is a more well-rounded performer. The Xeon is for a niche user who prioritizes multi-core throughput and ECC memory support above all else, while the i5 is the pragmatic pick for a modern, efficient, and feature-rich build.