Intel Core i7-3960X vs Intel Xeon E3-1270 v5 Comparison

The Intel Core i7-3960X, despite launching four years earlier on a much older process node, beats the Intel Xeon E3-1270 v5 in every single benchmark recorded in this comparison. The Xeon E3-1270 v5 wins zero of the six head-to-head tests, while the i7-3960X sweeps all six with margins ranging from 1.2% to 2%. The core count difference is the decisive factor: the i7-3960X offers 6 cores and 12 threads against the Xeon's 4 cores and 8 threads, and that extra parallelism translates into consistent, though modest, performance advantages across Cinebench R15, R20, and R23 workloads. The Xeon's newer Skylake architecture and higher boost clock of 4.00 GHz cannot overcome the i7's two additional physical cores.

Where Each One Wins

The Intel Core i7-3960X wins in every measured workload category. Its 6-core, 12-thread configuration dominates multi-threaded rendering tests, where the extra cores provide a structural advantage. In Cinebench R23 multi-core, the i7-3960X scores 7170 versus the Xeon's 7082, a 1.2% lead. The same pattern holds in Cinebench R20 multi-core, where the i7 achieves 3011 against the Xeon's 2974, and in Cinebench R15 multi-core, where it posts 722 versus 713. These are small margins, but they are consistent across every multi-threaded test in the dataset.

The Intel Xeon E3-1270 v5 does not win a single benchmark in this comparison. Even in single-core tests, where its 4.00 GHz boost clock should provide an advantage, it trails the i7-3960X. In Cinebench R23 single-core, the Xeon scores 999 while the i7-3960X scores 1012, a 1.3% deficit. The i7-3960X also wins single-core tests in Cinebench R15 (102 vs 100) and Cinebench R20 (425 vs 419). The Xeon's architectural advantage from being four years newer does not translate into a single benchmark victory.

The i7-3960X also holds a massive platform advantage in memory bandwidth, offering quad-channel DDR3 support with 51.2 GB/s bandwidth versus the Xeon's dual-channel 34.1 GB/s. This 50% bandwidth advantage could be significant in memory-sensitive workloads, even if benchmark scores show only marginal overall differences. The i7-3960X also provides 40 PCIe Gen 3 lanes versus the Xeon's 16, making it more suitable for multi-GPU or high-expansion configurations.

The Verdict

The data is unambiguous: the Intel Core i7-3960X is the faster processor in every recorded test. It wins all six head-to-head benchmarks, with the largest margin being 2% in Cinebench R15 single-core. The i7-3960X's 6-core, 12-thread configuration delivers a consistent performance advantage over the Xeon E3-1270 v5's 4-core, 8-thread design. The Xeon's newer 14 nm process and higher boost clock cannot compensate for the i7's additional two cores and 12 threads.

The i7-3960X's quad-channel memory bus (51.2 GB/s) and 40 PCIe lanes make it the superior choice for systems requiring high memory throughput or extensive expansion capabilities. The Xeon E3-1270 v5 counters with ECC memory support, a feature absent from the i7-3960X, and a lower TDP of 80 watts versus 130 watts. The Xeon also offers support for both DDR3 and DDR4 memory, while the i7-3960X is limited to DDR3. For users prioritizing raw performance, the i7-3960X is the clear winner. For users who require ECC memory validation or lower power consumption, the Xeon E3-1270 v5 holds specific advantages, but not in raw processing speed.

Head-to-Head Benchmarks

The closest contest is in Cinebench R15 multi-core, where the i7-3960X scores 722 and the Xeon scores 713, a 1.2% difference. This near-tie suggests that the Xeon's newer architecture nearly matches the i7's core advantage in this older benchmark. However, the gap remains consistent across newer tests. In Cinebench R20 multi-core, the i7-3960X posts 3011 versus the Xeon's 2974, again a 1.2% margin. In Cinebench R23 multi-core, the scores are 7170 and 7082, maintaining the same 1.2% difference.

Single-core results show slightly larger gaps. In Cinebench R15 single-core, the i7-3960X wins 102 to 100, a 2% margin. This is the largest delta in the entire comparison. In Cinebench R20 single-core, the i7-3960X leads 425 to 419, a 1.4% difference. In Cinebench R23 single-core, it leads 1012 to 999, a 1.3% margin. The i7-3960X also has additional benchmark data not available for the Xeon, including Geekbench multi-core (3193) and single-core (657) scores, which further support its overall performance profile.

The i7-3960X's average benchmark score of 2037 places it at the 45th percentile of all CPUs, while the Xeon E3-1270 v5 achieves a 2048 average score and the 46th percentile. This means that despite losing every head-to-head test, the Xeon has a slightly higher average benchmark score and percentile ranking. The Xeon's nearest rivals include the Intel Core i7-7820HK (2048, 0% delta) and AMD Ryzen 5 7520U (2046, 0.1% delta), while the i7-3960X sits near the AMD Opteron 6386 SE (2038, 0% delta) and Intel Core i7-7700T (2039, -0.1% delta). These figures suggest the two processors occupy nearly identical positions in the overall performance distribution.

FAQ

Q: Which processor wins in multi-core performance?

A: The Intel Core i7-3960X wins all three multi-core tests: Cinebench R15 (722 vs 713), R20 (3011 vs 2974), and R23 (7170 vs 7082), each by a 1.2% margin.

Q: Does the Xeon E3-1270 v5 have any single-core advantage?

A: No. The i7-3960X wins every single-core test as well, with margins of 2% in Cinebench R15 (102 vs 100), 1.4% in R20 (425 vs 419), and 1.3% in R23 (1012 vs 999).

Q: What is the biggest performance gap between the two?

A: The largest delta is 2% in Cinebench R15 single-core, where the i7-3960X scores 102 against the Xeon's 100. All other deltas are between 1.2% and 1.4%.

Q: Does the Xeon support ECC memory?

A: Yes, the Intel Xeon E3-1270 v5 supports ECC memory, while the Intel Core i7-3960X does not. The Xeon also supports both DDR3 and DDR4, while the i7-3960X only supports DDR3.

Q: How do their memory bandwidth capabilities compare?

A: The i7-3960X offers quad-channel memory with 51.2 GB/s bandwidth. The Xeon E3-1270 v5 offers dual-channel memory with 34.1 GB/s bandwidth, a significant 50% deficit.

Q: Which processor has more PCIe lanes?

A: The Intel Core i7-3960X provides 40 PCIe Gen 3 lanes, while the Intel Xeon E3-1270 v5 provides only 16 lanes (CPU only). This makes the i7-3960X more suitable for multi-GPU configurations.

Architecture Differences

The Intel Xeon E3-1270 v5 is built on the Skylake architecture using a 14 nm process, with 1,750 million transistors on a 122 mm² die. It features 4 cores and 8 threads, with a base clock of 3.60 GHz and a boost clock of 4.00 GHz. The cache hierarchy includes 64 KB L1 and 256 KB L2 per core, plus 8 MB shared L3. Memory support spans DDR3 and DDR4 in dual-channel configuration, with 34.1 GB/s bandwidth and ECC support. It uses the Intel Socket 1151 interface and is classified as a Server/Workstation part. The processor has a TDP of 80 watts and was released in October 2015 with a launch MSRP of $339.

The Intel Core i7-3960X is built on the Sandy Bridge architecture using a 32 nm process, with 2,270 million transistors on a 435 mm² die. It features 6 cores and 12 threads, with a base clock of 3.30 GHz and a boost clock of 3.90 GHz. The cache hierarchy includes 64 KB L1 and 256 KB L2 per core, plus 15 MB shared L3. Memory support is limited to DDR3 in quad-channel configuration, with 51.2 GB/s bandwidth and no ECC support. It uses the Intel Socket 2011 interface and is classified as a Desktop part. The processor has a TDP of 130 watts and was released in November 2011 with a launch MSRP of $990. The multiplier is unlocked, allowing overclocking, whereas the Xeon's multiplier is locked.

Specification Differences

The most significant specification difference is core count: the i7-3960X has 6 cores and 12 threads, while the Xeon E3-1270 v5 has 4 cores and 8 threads. The i7-3960X also has a larger L3 cache at 15 MB shared versus the Xeon's 8 MB shared. Memory channels differ, with the i7-3960X supporting quad-channel DDR3 and the Xeon supporting dual-channel DDR3 and DDR4. Memory bandwidth is 51.2 GB/s for the i7-3960X versus 34.1 GB/s for the Xeon.

The Xeon supports ECC memory; the i7-3960X does not. The i7-3960X provides 40 PCIe Gen 3 lanes, while the Xeon provides 16 lanes. Base clocks differ: the Xeon runs at 3.60 GHz versus the i7-3960X's 3.30 GHz. Boost clocks also differ: 4.00 GHz for the Xeon versus 3.90 GHz for the i7-3960X. TDP is significantly lower on the Xeon at 80 watts versus 130 watts for the i7-3960X. The process node is newer on the Xeon (14 nm versus 32 nm), and the Xeon has a smaller die (122 mm² versus 435 mm²) with fewer transistors (1,750 million versus 2,270 million). The i7-3960X has an unlocked multiplier, while the Xeon's is locked. The launch MSRP was $339 for the Xeon and $990 for the i7-3960X.