Intel Xeon E3-1275 v5

The Intel Xeon E3-1275 v5 is a 4-core, 8-thread Skylake-DT processor aimed at the Server/Workstation segment. It has a 3.60 GHz base clock, a 4.00 GHz boost clock, and an 80 W TDP, and it was released in October 2015 with a launch MSRP of $350. Its average benchmark score is 2028, and its 47th percentile rank places it near the middle of the CPU database.

Benchmark Performance

The aggregate data puts the E3-1275 v5 at a 2028 average benchmark score. That score places it in an extremely tight cluster around its nearest rivals. The Intel Xeon E3-1280 v5 scores 2026, with a delta of 0.1%, meaning the E3-1275 v5 is effectively tied with it. The Intel Xeon E3-1240 v5 scores 2031, with a delta of -0.2%, so the E3-1275 v5 trails by a marginal amount. The Intel Xeon E3-1260L v5 scores 2025, with a delta of 0.2%, putting the E3-1275 v5 narrowly ahead. The Intel Core i7-3960X scores 2036, with a delta of -0.4%, the largest gap in the group, yet still within the same performance class.

The Cinebench results reinforce this mid-range standing. In Cinebench R23, the E3-1275 v5 scores 7012 multi-core and 990 single-core. In R20, the scores are 2945 multi-core and 415 single-core. In R15, the scores are 706 multi-core and 99 single-core. None of these scores suggests a top-tier result; the 47th percentile rank places the chip below a majority of CPUs in the database. The nearest-rival deltas, all within 0.4 percentage points, show that this processor is not defined by a decisive win or loss in aggregate benchmarks. It is a competent, mid-pack performer whose exact position depends on the workload.

Power and Thermals

The E3-1275 v5 carries an 80 W TDP. That figure is the thermal anchor for system design. Built on Intel's 14 nm process, with 1,750 million transistors in a 122 mm² die, the processor sits in a power class that does not require an exotic cooling solution. The integrated HD Graphics P530 adds to the package, but the data provides only the 80 W TDP as the thermal envelope to plan around. A conventional air cooler suited to an 80 W class processor is the implied cooling tier. The boost clock of 4.00 GHz means peak frequency is available without pushing into high-TDP territory. This is not a thermally demanding server/workstation part; it is a modest package by the numbers in the database.

Single-Thread vs Multi-Thread Behavior

The processor combines 4 physical cores with 8 threads. Base clock is 3.60 GHz, and the boost clock reaches 4.00 GHz. The Cinebench numbers show a clear scaling pattern from single-core to multi-core. In R23, the single-core score is 990 while the multi-core score is 7012. In R20, the single-core score is 415 and the multi-core score is 2945. In R15, the single-core score is 99 and the multi-core score is 706. The multi-core results are substantially higher than the single-core results, indicating that the 8 threads are being used effectively under threaded workloads.

For lightly threaded applications, the 4.00 GHz boost clock matters more than the absolute single-core scores. For workloads that scale across cores, the 4-core/8-thread design provides meaningful throughput gains over a true single-threaded result. The data does not show an extreme single-core advantage or a high-core-count scaling star. Instead, the E3-1275 v5 behaves like a balanced 4-core/8-thread processor: strong enough for common mixed workloads, but without the parallel muscle of higher-core-count parts.

How It Compares

Intel Xeon E3-1280 v5: The nearest-rival table shows the E3-1280 v5 with an average score of 2026. The E3-1275 v5 is 0.1% ahead. In practical terms, these two processors are indistinguishable in aggregate benchmark data.

Intel Xeon E3-1240 v5: The E3-1240 v5 averages 2031, which puts the E3-1275 v5 0.2% behind. The difference is small enough that real-world application results will likely overlap. The data treats this as a near tie.

Intel Xeon E3-1260L v5: The E3-1260L v5 averages 2025. The E3-1275 v5 is 0.2% ahead. These two are also clustered tightly together, with the 2028 average score of the E3-1275 v5 sitting almost exactly between the surrounding rivals.

Intel Core i7-3960X: The Core i7-3960X averages 2036, making the E3-1275 v5 0.4% slower. This is the largest delta among the nearest rivals, but it is still a small margin. The aggregate scores are close enough that the E3-1275 v5 does not lose meaningful ground in overall benchmark standing.

Across all four nearest rivals, the deltas remain between -0.4% and +0.2%. The E3-1275 v5 neither dominates nor is dominated by its closest competing parts.

Platform and Compatibility

The E3-1275 v5 uses Intel Socket 1151. The memory controller is dual-channel and supports both DDR3 and DDR4 memory, with a rated bandwidth of 34.1 GB/s. ECC memory is supported, which matches the Server/Workstation market segment. For PCIe, the CPU provides Gen 3 with 16 lanes from the CPU only. There is also integrated graphics in the form of HD Graphics P530.

The production status is end-of-life, so the data indicates that this processor is not positioned for ongoing new-platform adoption. For an existing Socket 1151 system, the memory flexibility and ECC support are the platform's defining features. Because the multiplier is not unlocked, overclocking is not part of the platform story. Upgrade considerations are therefore bounded by the same socket, memory type, and generation rather than by future expansion. The end-of-life status is the key caveat for anyone assessing a long-term platform path.

Who Should Consider It

The E3-1275 v5 is best suited to workloads that benefit from ECC memory support and an 8-thread layout without requiring a high core count. For creation work, the multi-core Cinebench scores of 706, 2945, and 7012 show practical throughput, but the 47th percentile rank and 4-core design mean it is not intended for heavily parallel rendering. For gaming, the single-core scores of 99, 415, and 990, combined with the 4.00 GHz boost clock, indicate adequate lightly threaded performance. For office and general productivity, the integrated HD Graphics P530 and dual-channel memory support cover basic system needs, though the processor is marketed for server/workstation use rather than consumer desktops.

The data profile points to a specific audience: users who want ECC memory, 8 threads, and the Socket 1151 platform, and who are comfortable with an end-of-life product. It is not a high-core-count creation powerhouse, nor is it a top percentile gaming chip. It is a balanced server/workstation part whose performance is closely matched by its nearest rivals.

FAQ

Q: What socket does the Intel Xeon E3-1275 v5 use?

A: It uses Intel Socket 1151.

Q: Does the E3-1275 v5 support ECC memory?

A: Yes, ECC memory is supported.

Q: What memory types can the E3-1275 v5 use?

A: It supports DDR3 and DDR4 memory through a dual-channel memory bus with 34.1 GB/s rated bandwidth.

Q: Does the E3-1275 v5 have integrated graphics?

A: Yes, it includes HD Graphics P530.

Q: Is the E3-1275 v5 multiplier unlocked?

A: No, the multiplier is not unlocked.

Q: What PCIe configuration does the CPU provide?

A: It provides Gen 3 PCIe with 16 lanes from the CPU only.