Intel Core i3-10105T vs Intel Xeon E3-1275 v5 Comparison

The Intel Core i3-10105T and the Intel Xeon E3-1275 v5 are both 4-core, 8-thread Intel processors, but they target very different market segments and eras. The data shows a consistent performance advantage for the older Xeon part across every benchmark, despite the Core i3 being the newer, lower-power design. This head-to-head analysis quantifies exactly how large that gap is and what architectural choices explain it.

Head-to-Head Benchmarks

The benchmark results are unambiguous: the Intel Xeon E3-1275 v5 wins all six head-to-head comparisons. The margin is remarkably consistent, hovering near 6% in every test. In Cinebench R15 multi-core, the Xeon scores 712 against the Core i3's 670, a 5.9% deficit for the i3. Single-core in the same test shows a nearly identical story: the Xeon posts 100 points versus 94, a 6% gap.

Moving to Cinebench R20, the pattern holds. The Xeon's multi-core score of 2967 beats the i3's 2795 by 5.8%. In single-core, the Xeon's 418 outpaces the i3's 394 by 5.7%. The most recent Cinebench R23 results confirm the trend with the same precision: multi-core sees the Xeon at 7065 versus 6656 (5.8% ahead), while single-core is 997 against 939, again a 5.8% margin.

The consistency of these deltas — never straying beyond a 5.7% to 6.0% range — suggests a fixed clock-speed advantage rather than any architectural efficiency difference. The Xeon's base clock is 3.60 GHz and boost is 4.00 GHz, while the Core i3 runs at 3.00 GHz base and 3.90 GHz boost. That higher sustained clock speed translates directly into the roughly 6% performance lead observed across every workload.

It is worth remembering the Core i3 has no wins at all in this comparison. The Xeon takes all six benchmarks. However, the magnitude of the loss is modest. A 6% deficit is noticeable but not transformative; the Core i3 remains within striking distance in everyday tasks, even if it trails in every measured metric.

The aggregate benchmark scores tell a similar but slightly flatter story. The Core i3's average benchmark score is 2058, placing it in the 46th percentile of all CPUs. The Xeon's average is 2043, which puts it in the 45th percentile. This is a curious inversion: the Xeon wins every individual test but has a lower average score and percentile. This is because the Xeon lacks Geekbench results in the data set, while the Core i3 has Geekbench multi-core and single-core scores of 3649 and 1265, respectively. Those additional data points drag the Core i3's average up, even though its Cinebench scores are lower.

In terms of nearest rivals, the Core i3 sits alongside the Intel Core i7-8705G with an identical average score of 2058, and the AMD Ryzen 5 3400G at 2059, a mere 0.1% difference. The Xeon's closest competitor is the Intel Xeon E3-1270 v5 at 2048, just 0.2% ahead, with the AMD Ryzen 5 7520U at 2046 trailing by 0.1%. These rival comparisons reinforce that both processors occupy a similar performance tier, despite the Xeon's consistent head-to-head wins.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The Intel Xeon E3-1275 v5 wins every multi-core test. In Cinebench R23 multi-core, it scores 7065 versus the Core i3-10105T's 6656, a 5.8% advantage. The margins are nearly identical in Cinebench R15 (712 vs 670) and R20 (2967 vs 2795).

Q: Is the single-core performance gap the same as the multi-core gap?

A: Yes, the data shows a consistent delta across all tests. In Cinebench R23 single-core, the Xeon scores 997 against the i3's 939, a 5.8% lead. The R15 single-core test shows a 6% gap (100 vs 94), and R20 single-core shows 5.7% (418 vs 394).

Q: How do these processors compare in overall benchmark standing?

A: The Core i3-10105T has a slightly higher average benchmark score of 2058 and sits in the 46th percentile, while the Xeon E3-1275 v5 averages 2043 and ranks in the 45th percentile. This is because the Core i3 has Geekbench scores included, which the Xeon lacks, skewing the aggregate comparison.

Q: What is the power consumption difference?

A: The Core i3-10105T has a TDP of 35 watts, while the Xeon E3-1275 v5 has a TDP of 80 watts. The Core i3 draws less than half the power of the Xeon, which explains its lower clock speeds and the resulting performance deficit.

Q: Do both processors support the same memory types?

A: No. The Core i3-10105T supports DDR4 memory with a bandwidth of 42.7 GB/s. The Xeon E3-1275 v5 supports both DDR3 and DDR4, but its memory bandwidth is lower at 34.1 GB/s. The Xeon also supports ECC memory, while the Core i3 does not.

Q: Which processor has a larger L3 cache?

A: The Xeon E3-1275 v5 has 8 MB of shared L3 cache, while the Core i3-10105T has 6 MB. Both have identical per-core L1 and L2 cache sizes at 64 KB and 256 KB, respectively.

The Verdict

The data points to a clear, if modest, winner for raw performance: the Intel Xeon E3-1275 v5. It wins every single benchmark in the head-to-head comparison, with a consistent 5.7% to 6.0% advantage across all Cinebench versions and both single-core and multi-core tests. Anyone prioritizing maximum compute throughput from these two specific processors should choose the Xeon.

However, the choice is not solely about performance. The Core i3-10105T consumes 35 watts versus the Xeon's 80 watts — a massive efficiency difference. The Core i3 is also an active production part with a newer release date, while the Xeon is end-of-life. The Core i3 supports DDR4 memory with higher bandwidth (42.7 GB/s versus 34.1 GB/s) and includes UHD Graphics 630, whereas the Xeon has HD Graphics P530.

The decision hinges on use case. For a low-power desktop build where energy efficiency is paramount, the Core i3-10105T is the logical pick, sacrificing only about 6% performance for a 45-watt TDP reduction. For a server or workstation application where ECC memory support is mandatory and absolute performance matters more than power draw, the Xeon E3-1275 v5 is the only choice between these two, as the Core i3 lacks ECC support entirely. The Xeon's 8 MB L3 cache also gives it a slight edge in cache-sensitive workloads, though the benchmark data shows this translates to the same ~6% overall delta.

Specification Differences

The two processors diverge on nearly every specification except core count, thread count, and process node. Both have 4 cores and 8 threads, and both are built on Intel's 14 nm process. The similarities end there.

The Core i3-10105T runs at a 3.00 GHz base clock and 3.90 GHz boost, while the Xeon E3-1275 v5 runs at 3.60 GHz base and 4.00 GHz boost. The Xeon has higher clocks across the board. TDP is a major differentiator: the Core i3 draws 35 watts, the Xeon draws 80 watts.

The socket differs entirely. The Core i3 uses Intel Socket 1200, while the Xeon uses Intel Socket 1151. These are not cross-compatible. The Core i3 supports only DDR4 memory, while the Xeon supports both DDR3 and DDR4. Memory bandwidth favors the Core i3 at 42.7 GB/s versus the Xeon's 34.1 GB/s. ECC memory is supported only on the Xeon.

The integrated graphics differ as well: the Core i3 has UHD Graphics 630, the Xeon has HD Graphics P530. Both use PCIe Gen 3 with 16 lanes from the CPU. The Core i3 is an active desktop part, while the Xeon is an end-of-life server/workstation part. The launch MSRP for the Core i3 is $134, and for the Xeon it is $350.

Architecture Differences

At the architectural level, these are two distinct designs from different eras. The Core i3-10105T is based on Comet Lake, specifically the Comet Lake-R codename, and belongs to the Core 10th Gen family. The Xeon E3-1275 v5 uses the Skylake architecture with the Skylake-DT codename, and belongs to the Xeon E3 (Skylake-DT) generation.

Both use the same 14 nm process node from Intel, but the Xeon is the older part, released in October 2015, while the Core i3 was released in March 2021. The Xeon has published transistor and die size figures: 1,750 million transistors on a 122 mm² die. The Core i3 does not have these figures listed.

Cache configuration differs in L3 only. Both have 64 KB L1 and 256 KB L2 per core, but the Xeon has 8 MB of shared L3 cache, while the Core i3 has 6 MB. This 2 MB difference could matter for workloads with large working sets, though the benchmark data shows the performance delta remains consistent at around 6% regardless of cache size.

The Xeon is built for the server/workstation segment and includes ECC memory support, a hallmark of professional platforms. The Core i3 is a desktop part without ECC. The Xeon's memory controller supports both DDR3 and DDR4, giving it flexibility for older systems, but its bandwidth is lower at 34.1 GB/s. The Core i3 is DDR4-only but achieves higher bandwidth at 42.7 GB/s.

The integrated graphics also reflect their respective origins. The Core i3's UHD Graphics 630 is a newer iteration, while the Xeon's HD Graphics P530 is an older professional-grade solution. Both are adequate for basic display output, but neither is designed for heavy graphical workloads.

The production status tells the story of their lifecycles. The Core i3 is active and still being manufactured, while the Xeon is end-of-life. This means the Core i3 remains a viable option for new builds, whereas the Xeon is only available through existing stock or the used market. Despite its age, the Xeon's higher clock speeds and larger cache give it the edge in every benchmark measured, making it the faster processor in pure compute terms, even if it is far less efficient and no longer in production.