Intel Xeon E3-1260L v5 vs Intel Xeon E3-1280 v5 Comparison

The Intel Xeon E3-1280 v5 and Intel Xeon E3-1260L v5 are both Skylake-DT parts aimed at the server/workstation segment, sharing identical core counts and cache configurations, but they diverge sharply on power targets and clock speeds. The benchmark data shows complete parity across all six tested workloads, with the average benchmark score for both processors sitting at exactly 2029. Each CPU occupies the 45th percentile of all CPUs tracked, and the nearest-rival list places them as perfect mirrors of each other, with a deltaPct of 0. The head-to-head results reinforce this picture: every Cinebench test, from R15 to R23, in both single-core and multi-core modes, returns identical scores of 707, 99, 2946, 415, 7015, and 990 respectively. The E3-1280 v5 is credited with six wins, but those wins are all by a margin of 0%, meaning neither chip actually outperforms the other in any measurable way.

Head-to-Head Benchmarks

The benchmark results are striking for their uniformity. In Cinebench R15 multi-core, both processors score 707; in single-core, both score 99. Moving to R20, the multi-core score is 2946 for each, and the single-core score is 415. In the more demanding R23 test, the multi-core result is 7015 for both, and the single-core result is 990. There is not a single data point where the E3-1280 v5 pulls ahead or the E3-1260L v5 falls behind. The deltaPct for every comparison is 0, indicating no measurable performance difference under these workloads.

This parity is unexpected given the specification gap. The E3-1280 v5 runs at a base clock of 3.70 GHz and boosts to 4.00 GHz, while the E3-1260L v5 starts at 2.90 GHz and boosts to 3.90 GHz. A naive reading of those clocks would suggest the E3-1280 v5 should dominate multi-threaded tasks, yet the Cinebench suite does not reflect that. The average benchmark score of 2029 for both chips confirms the pattern, and their shared 45th percentile ranking places them identically against the broader CPU landscape. When compared to the Intel Xeon E3-1240 v5, both sit 0.1% behind that chip's average score of 2030; against the Intel Core i7-5775R, they are also 0.1% behind its 2031; and versus the Intel Core i5-1130G7, they are 0.1% ahead of its 2026. These rival deltas are tiny, suggesting the two Xeons are effectively interchangeable in benchmark output.

Where Each One Wins

Based strictly on the data, neither processor wins any benchmark outright. The E3-1280 v5 is credited with six wins in the head-to-head table, but every one of those is a tie by deltaPct. The E3-1260L v5 has zero wins. This means there is no use case where the benchmark scores favor one chip over the other. For single-threaded responsiveness, both deliver identical Cinebench R23 single-core scores of 990. For multi-threaded rendering, both deliver identical R23 multi-core scores of 7015. The only differentiators come from non-benchmark specifications, which are discussed below. If a workload relies purely on these Cinebench metrics, the choice between the two is arbitrary from a performance standpoint.

Architecture Differences

Both processors share the same Skylake architecture and Skylake-DT codename, built on Intel's 14 nm process node. The foundry is Intel for both, with 1,750 million transistors on a 122 mm² die. The cache hierarchy is identical: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. Neither chip includes integrated graphics, and both support ECC memory. The PCIe configuration is the same — Gen 3 with 16 lanes from the CPU. The generation field labels both as "Xeon E3 (Skylake-DT)", and the market segment for each is Server/Workstation. The production status is End-of-life for both, with the same release date of 2015-10-18. There are no architectural differences in the core design, process, or memory controller features that would explain any performance gap, because no performance gap exists in the data.

The one architectural nuance lies in memory support. The E3-1280 v5 lists DDR4 only, while the E3-1260L v5 lists DDR3 and DDR4. However, the E3-1260L v5 also includes a memory bandwidth figure of 34.1 GB/s, which the E3-1280 v5 does not specify. That bandwidth number is not tied to a benchmark score, so its practical impact is not measured in the Cinebench results. Both run dual-channel memory buses. The transistor count and die size being identical reinforces that these are the same physical design, with clock and power binning as the primary differentiators.

Specification Differences

The two processors differ on exactly four specification fields. The first is base clock: the E3-1280 v5 runs at 3.70 GHz, while the E3-1260L v5 runs at 2.90 GHz — a difference of 0.80 GHz. The second is boost clock: the E3-1280 v5 reaches 4.00 GHz, while the E3-1260L v5 reaches 3.90 GHz — a difference of 0.10 GHz. The third is TDP: the E3-1280 v5 is rated at 80 watts, while the E3-1260L v5 is rated at 45 watts. That 35-watt gap is substantial, positioning the E3-1260L v5 as the lower-power part. The fourth is memory support: the E3-1280 v5 is limited to DDR4, while the E3-1260L v5 supports both DDR3 and DDR4. The E3-1260L v5 also carries a memory bandwidth specification of 34.1 GB/s, a field that is null for the E3-1280 v5. The launch MSRP differs as well, with the E3-1280 v5 at $612 and the E3-1260L v5 at $294. Both share the same socket (Intel Socket 1151), part numbers SR2LC and SR2LH respectively, and neither has an unlocked multiplier.

FAQ

Q: Which processor has a higher base clock?

A: The Intel Xeon E3-1280 v5 has a base clock of 3.70 GHz, compared to 2.90 GHz for the Intel Xeon E3-1260L v5.

Q: Do the two CPUs ever differ in benchmark scores?

A: No. Across all six Cinebench tests (R15, R20, R23 in both single-core and multi-core), the scores are identical: 707, 99, 2946, 415, 7015, and 990.

Q: What is the TDP difference between them?

A: The E3-1280 v5 is rated at 80 watts, while the E3-1260L v5 is rated at 45 watts, a difference of 35 watts.

Q: Which processor supports DDR3 memory?

A: Only the Intel Xeon E3-1260L v5 supports DDR3 and DDR4. The E3-1280 v5 supports DDR4 only.

Q: How do they compare to the Intel Xeon E3-1240 v5?

A: Both the E3-1280 v5 and the E3-1260L v5 have an average benchmark score of 2029, which is 0.1% lower than the E3-1240 v5's average score of 2030.

Q: What is the boost clock for each processor?

A: The E3-1280 v5 boosts to 4.00 GHz, and the E3-1260L v5 boosts to 3.90 GHz.

The Verdict

The data presents a straightforward choice: from a pure benchmark perspective, there is no winner. The Intel Xeon E3-1280 v5 and Intel Xeon E3-1260L v5 produce identical scores in every tested workload, occupy the same 45th percentile, and share an average benchmark score of 2029. The E3-1280 v5's higher base and boost clocks do not translate into any measurable advantage in Cinebench, and the E3-1260L v5's lower TDP does not cost it any performance in these tests. For workloads that resemble Cinebench, either chip will deliver the same results.

The differentiators are therefore operational, not performance-based. The E3-1260L v5 is the clear choice for systems where power consumption is a priority, given its 45-watt TDP versus 80 watts for the E3-1280 v5. It also offers broader memory flexibility with DDR3 and DDR4 support, plus a specified memory bandwidth of 34.1 GB/s. The E3-1280 v5, by contrast, offers no benchmark advantage to justify its higher clocks, and its DDR4-only support is more restrictive. Neither chip has an unlocked multiplier, and both are end-of-life products. The launch MSRP for the E3-1280 v5 was $612, while the E3-1260L v5 launched at $294, but that price difference is not reflected in any performance metric. Buyers should select the E3-1260L v5 for lower power draw and memory compatibility, or the E3-1280 v5 only if the higher clock speeds are deemed necessary for non-benchmarked workloads that are not captured in this data set.