Intel Xeon E3-1270 v5 vs Intel Xeon E3-1280 v5 Comparison

The Verdict

The Intel Xeon E3-1270 v5 is the clear winner in this pairing. Across all six recorded Cinebench workloads, it finishes ahead of the Intel Xeon E3-1280 v5. The margins are narrow, ranging from 0.8% to 1%, but they are consistent. The E3-1270 v5 wins every single head-to-head test in the database, giving it a 6 to 0 sweep.

The E3-1280 v5, despite carrying a higher launch MSRP ($612 versus $339), does not translate that price difference into any performance advantage. Its average benchmark score sits at 2029, while the E3-1270 v5 reaches 2048. The percentile ranking also favors the E3-1270 v5, which sits at the 46th percentile among all CPUs, compared to the 45th percentile for the E3-1280 v5.

For a buyer choosing between these two, the data points firmly toward the E3-1270 v5. It is not just the better performer; it also holds a more favorable position relative to its nearest rivals. The E3-1270 v5 lands at the exact average score of the Intel Core i7-7820HK (2048) and sits just 0.1% above the AMD Ryzen 5 7520U (2046). The E3-1280 v5, by contrast, matches the Intel Xeon E3-1260L v5 (2029) exactly and trails the Intel Xeon E3-1240 v5 by 0.1% (2030). In short, the E3-1270 v5 offers the same architecture, the same core count, and superior measured results at a lower launch MSRP.

Architecture Differences

Both processors share the same fundamental silicon. They are built on Intel's Skylake architecture, specifically the Skylake-DT codename, and both belong to the Xeon E3 (Skylake-DT) generation. The process node is identical: 14 nm, produced by Intel's own foundry. Both chips contain 1,750 million transistors on a 122 mm² die.

The core and cache configuration is also identical. Each processor has 4 cores and 8 threads. The cache hierarchy matches exactly: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. Both support ECC memory and operate on the Intel Socket 1151. Neither has integrated graphics, neither has an unlocked multiplier, and both are classified for the Server/Workstation segment. They share the same PCIe configuration: Gen 3 with 16 lanes (CPU only). Both were released on the same date and are now end-of-life.

The differences are few but notable. The E3-1270 v5 has a base clock of 3.60 GHz, while the E3-1280 v5 starts at 3.70 GHz. Both boost to 4.00 GHz. The E3-1270 v5 supports both DDR3 and DDR4 memory, whereas the E3-1280 v5 supports only DDR4. The memory bus is dual-channel for both, but the E3-1270 v5 has a recorded memory bandwidth of 34.1 GB/s, while the E3-1280 v5 has no bandwidth figure listed. The launch MSRP differs significantly: $339 for the E3-1270 v5 and $612 for the E3-1280 v5.

Architecture Differences

At the architectural level, these are near-twin processors. Both use the Skylake-DT die, both are fabricated on Intel's 14 nm process, and both pack 4 cores and 8 threads. The transistor count is identical at 1,750 million, and the die size is exactly 122 mm². There is no difference in cache layout: 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3.

The memory controller is where a genuine distinction appears. The E3-1270 v5 accepts both DDR3 and DDR4, giving it flexibility in older or mixed platforms. The E3-1280 v5 is restricted to DDR4 only. Both run dual-channel memory, but the E3-1270 v5 records a memory bandwidth of 34.1 GB/s, a figure absent from the E3-1280 v5's entry.

Socket compatibility is identical: Intel Socket 1151. PCIe support is also the same: Gen 3 with 16 lanes from the CPU. Both processors lack integrated graphics, making them unsuitable for tasks requiring an iGPU without a discrete card. ECC memory support is present on both, appropriate for their server and workstation segment.

The base clock is the only other internal difference. The E3-1280 v5 operates at 3.70 GHz, 100 MHz higher than the E3-1270 v5's 3.60 GHz. That higher base clock does not, however, appear in the benchmark outcomes. The E3-1280 v5's boost clock is 4.00 GHz, identical to the E3-1270 v5's boost clock.

Head-to-Head Benchmarks

The E3-1270 v5 wins every recorded benchmark. The smallest margin is in Cinebench R23 multi-core, where it scores 7082 against 7015, a 1.0% lead. The largest margin is also 1.0% in Cinebench R20 multi-core (2974 vs 2946) and single-core (419 vs 415). The other results are similarly tight.

In Cinebench R15, the multi-core score is 713 for the E3-1270 v5 and 707 for the E3-1280 v5, a 0.8% difference. The single-core score is 100 versus 99, a 1.0% edge. In Cinebench R20, the multi-core result is 2974 versus 2946, and the single-core result is 419 versus 415, both at 1.0%. In Cinebench R23, the multi-core result is 7082 versus 7015 (1.0%), and the single-core result is 999 versus 990 (0.9%).

The pattern is unambiguous: the E3-1270 v5 is faster in every measured scenario. The differences are small in absolute percentage terms, but the consistency across six tests leaves no ambiguity. The E3-1280 v5, despite its higher base clock, never once takes the lead. The best it manages is a near tie in R15 single-core, where it trails by a single point.

These margins align with the average benchmark scores. The E3-1270 v5 averages 2048 points across all tests, while the E3-1280 v5 averages 2029. The E3-1270 v5 also has the higher percentile rank (46 vs 45), confirming that its performance advantage is real and measurable across the broader CPU landscape.

Specification Differences

The two processors differ in exactly three recorded specifications: base clock, memory support, and launch MSRP. There are also differences in memory bandwidth (present for the E3-1270 v5, absent for the E3-1280 v5) and part number.

• Base clock: 3.60 GHz for the E3-1270 v5, 3.70 GHz for the E3-1280 v5.
• Memory support: DDR3 and DDR4 for the E3-1270 v5, DDR4 only for the E3-1280 v5.
• Memory bandwidth: 34.1 GB/s for the E3-1270 v5, no recorded value for the E3-1280 v5.
• Launch MSRP: $339 for the E3-1270 v5, $612 for the E3-1280 v5.
• Part number: SR2LF for the E3-1270 v5, SR2LC for the E3-1280 v5.

All other specifications are identical: 4 cores, 8 threads, 80 W TDP, Intel Socket 1151, Skylake architecture, 14 nm process, 1,750 million transistors, 122 mm² die size, 64 KB L1 per core, 256 KB L2 per core, 8 MB shared L3, dual-channel memory bus, ECC support, PCIe Gen 3 with 16 lanes, no integrated graphics, Server/Workstation segment, end-of-life status, and the same release date.

FAQ

Q: Which processor has the higher base clock?

A: The Intel Xeon E3-1280 v5 runs at 3.70 GHz, while the Intel Xeon E3-1270 v5 runs at 3.60 GHz. Both boost to 4.00 GHz.

Q: Does the higher base clock translate to better benchmark scores?

A: No. The E3-1270 v5, despite a 100 MHz lower base clock, wins all six head-to-head Cinebench tests, with margins between 0.8% and 1.0%.

Q: What is the difference in memory support?

A: The E3-1270 v5 supports both DDR3 and DDR4 memory, while the E3-1280 v5 supports DDR4 only. The E3-1270 v5 also lists a memory bandwidth of 34.1 GB/s, which is absent for the E3-1280 v5.

Q: Do these processors have integrated graphics?

A: No. Both the E3-1270 v5 and the E3-1280 v5 have no integrated graphics, requiring a discrete GPU.

Q: Which processor has the better average benchmark score?

A: The E3-1270 v5 averages 2048 points, versus 2029 for the E3-1280 v5. The E3-1270 v5 also ranks at the 46th percentile among all CPUs, compared to the 45th percentile for the E3-1280 v5.

Q: Are they on the same socket and process node?

A: Yes. Both use Intel Socket 1151 and are built on a 14 nm process with 1,750 million transistors and a 122 mm² die size.

Where Each One Wins

The Intel Xeon E3-1270 v5 wins in every benchmark category recorded. It leads in single-core and multi-core performance across Cinebench R15, R20, and R23. The largest margin is 1.0% in both R20 and R23 multi-core tests, and it also leads by 1.0% in R15 single-core. Its average benchmark score is 19.7 points higher than the E3-1280 v5.

The E3-1280 v5 has no benchmark wins in the database. Its only advantages are a higher base clock (3.70 GHz vs 3.60 GHz) and a different memory configuration (DDR4 only). It also carries a higher launch MSRP.

For real-world use, the E3-1270 v5 is the stronger choice. The data shows it delivers the same or better performance in every test, with a lower launch MSRP and broader memory compatibility (DDR3 and DDR4). The E3-1280 v5 offers no measurable performance benefit despite its higher base clock, making it a niche pick only for those who specifically need DDR4-only support and are willing to pay more for it.

The E3-1270 v5 is the one to pick for general server and workstation workloads. The E3-1280 v5, with its higher base clock but no benchmark wins, serves only as a less efficient alternative with no recorded performance advantage.