CPU Comparison

The Intel Core i7-980 and Intel Xeon D-1528 present a fascinating study in architectural divergence: a 2011 desktop flagship built on Westmere against a 2015 server-oriented Broadwell part. Both offer 6 cores and 12 threads, yet the benchmark data shows the Core i7-980 winning every single head-to-head Cinebench test, albeit by remarkably slim margins. The largest victory for the Core i7-980 comes in the Cinebench R15 single-core test, where it scores 83 against the Xeon D-1528’s 82, a 1.2% delta. The average benchmark score tells a similar story: the Core i7-980 averages 1693, while the Xeon D-1528 averages 1677, placing the former roughly 1% higher overall. Both processors sit at the 40th percentile among all CPUs, indicating they are closely matched in the broader landscape despite their generational and architectural gaps.

Head-to-Head Benchmarks

The Core i7-980 wins all six recorded Cinebench tests, but the margins are consistently narrow. In Cinebench R15 multi-core, the Core i7-980 scores 589 versus the Xeon D-1528’s 584, a 0.9% advantage. This pattern repeats in Cinebench R20 multi-core, where the Core i7-980 posts 2458 against 2435, again a 0.9% delta. The single-core results follow the same trend: Cinebench R15 single-core sees the Core i7-980 at 83 and the Xeon D-1528 at 82 (1.2% delta), while Cinebench R20 single-core has the Core i7-980 at 346 and the Xeon D-1528 at 343 (0.9% delta). The largest absolute gap appears in Cinebench R23 multi-core, where the Core i7-980 scores 5853 versus the Xeon D-1528’s 5799, a 54-point difference that still translates to just a 0.9% lead. Even the Cinebench R23 single-core test, which shows the Core i7-980 ahead at 826 versus 818, only yields a 1% delta.

These margins are almost suspiciously consistent, suggesting the two chips are fundamentally performance peers in Cinebench workloads. The Core i7-980’s higher base clock of 3.33 GHz and boost clock of 3.60 GHz certainly help, but the Xeon D-1528 compensates with a more modern 14 nm process and a different cache topology. The Xeon D-1528’s L3 cache is organized as 1.5 MB per core, totaling 9 MB, while the Core i7-980 has a 12 MB shared L3 cache. Despite this difference, the benchmarks show no clear winner in memory-sensitive workloads, the Core i7-980’s triple-channel DDR3 support versus the Xeon D-1528’s dual-channel DDR3/DDR4 support appears to cancel out. When comparing to their nearest rivals, the Core i7-980 sits within 0.5% of the AMD Athlon Gold 3150G and 0.3% of the Intel Core i7-3770K, while the Xeon D-1528 is 0.6% behind the Intel Core i7-3770K and 0.3% behind the Intel Core i5-4690K.

Where Each One Wins

The benchmark data offers no instance where the Xeon D-1528 wins a Cinebench test, so the use-case split must be derived from architectural and specification differences rather than raw scores. The Core i7-980 wins all six benchmarks, but its edge is so small that real-world applications would likely see negligible differences. However, the Core i7-980’s 130W TDP versus the Xeon D-1528’s 35W TDP is a massive differentiator, the Xeon D-1528 draws far less power, making it suitable for dense server deployments where thermal management is critical. The Xeon D-1528 also supports ECC memory, which the Core i7-980 does not, making the former a safer choice for data integrity in server workloads. The Xeon D-1528’s PCIe Gen 3 with 24 lanes (CPU only) versus the Core i7-980’s PCIe Gen 2 suggests better I/O throughput for network or storage controllers, even though the Core i7-980 wins on pure compute.

For single-threaded responsiveness, the Core i7-980’s 3.60 GHz boost clock gives it a slight edge, as seen in the 1.2% Cinebench R15 single-core win. For multi-threaded rendering, the Core i7-980 also leads, but the Xeon D-1528’s 1.5 MB per-core L3 cache might benefit certain server workloads that exhibit better locality. The Xeon D-1528’s active production status and newer architecture (Broadwell) mean it benefits from more recent instruction set features, even though the benchmarks don’t reveal a performance advantage. The Core i7-980 is end-of-life, so its winning margins are historical rather than indicative of ongoing support.

The Verdict

The data clearly shows the Intel Core i7-980 as the faster processor in every Cinebench test, but the differences are so small that they border on statistical noise. The Core i7-980’s highest win margin is 1.2% in Cinebench R15 single-core, and its average benchmark score of 1693 is only 16 points higher than the Xeon D-1528’s 1677. For a desktop user running Cinebench-style workloads, the Core i7-980 is the pick, but the 130W TDP means it requires more robust cooling and power delivery. The Xeon D-1528, despite losing all benchmarks, offers a 35W TDP, ECC memory support, and PCIe Gen 3, making it the better choice for server or workstation environments where power efficiency and data integrity outweigh a 1% compute deficit. The Xeon D-1528’s launch MSRP is $320, which is a factual data point, but the Core i7-980 has no listed launch MSRP in the data. Neither processor has an unlocked multiplier, so overclocking is not an option for either. Buyers should choose based on platform needs: the Core i7-980 for a legacy desktop build with superior raw compute, or the Xeon D-1528 for a low-power, ECC-capable server platform where the slight performance loss is acceptable.

FAQ

Q: Which processor wins the most benchmarks in the head-to-head comparison?

A: The Intel Core i7-980 wins all six Cinebench tests, with win margins ranging from 0.9% to 1.2% over the Intel Xeon D-1528.

Q: What is the average benchmark score difference between the two?

A: The Intel Core i7-980 has an average benchmark score of 1693, while the Intel Xeon D-1528 has an average of 1677, a 16-point difference favoring the Core i7-980.

Q: Does the Intel Xeon D-1528 support ECC memory?

A: Yes, the Intel Xeon D-1528 supports ECC memory, while the Intel Core i7-980 does not.

Q: What are the TDP ratings for each processor?

A: The Intel Core i7-980 has a TDP of 130W, while the Intel Xeon D-1528 has a TDP of 35W.

Q: Which processor has a newer manufacturing process?

A: The Intel Xeon D-1528 uses a 14 nm process node, while the Intel Core i7-980 uses a 32 nm process node.

Q: How do the two processors compare in terms of PCIe support?

A: The Intel Xeon D-1528 supports PCIe Gen 3 with 24 lanes (CPU only), while the Intel Core i7-980 supports PCIe Gen 2.

Architecture Differences

The Intel Core i7-980 is built on the Westmere architecture, codenamed Gulftown, using a 32 nm process node with 1,170 million transistors on a 239 mm² die. The Intel Xeon D-1528 is built on the Broadwell architecture, using a 14 nm process node with 3,200 million transistors on a 246 mm² die. This means the Xeon D-1528 packs nearly three times the transistor count into a slightly larger die, reflecting the process shrink and architectural improvements. The Core i7-980’s cache hierarchy consists of 64 KB L1 per core, 256 KB L2 per core, and a 12 MB shared L3 cache. The Xeon D-1528 has the same L1 and L2 sizes per core, but its L3 cache is organized as 1.5 MB per core, which totals 9 MB across the six cores, a smaller overall L3 but with a per-core partitioning scheme that may reduce contention. The Core i7-980 supports triple-channel DDR3 memory, while the Xeon D-1528 supports dual-channel DDR3 and DDR4 memory, giving the former a theoretical memory bandwidth advantage in the data. The Xeon D-1528 also supports ECC memory and includes PCIe Gen 3 with 24 lanes (CPU only), whereas the Core i7-980 uses PCIe Gen 2. The Xeon D-1528’s socket is Intel BGA 1667, a soldered design, while the Core i7-980 uses Intel Socket 1366, a socketed design.

Specification Differences

The two processors differ in several key specification fields. The base clock differs significantly: the Intel Core i7-980 has a base clock of 3.33 GHz, while the Intel Xeon D-1528 has a base clock of 1900.00 MHz (1.90 GHz). The boost clock also differs: the Core i7-980 boosts to 3.60 GHz, while the Xeon D-1528 boosts to 2.50 GHz. The TDP is another major difference, with the Core i7-980 rated at 130W and the Xeon D-1528 at 35W. The socket types differ, with the Core i7-980 using Intel Socket 1366 and the Xeon D-1528 using Intel BGA 1667. Memory support differs: the Core i7-980 supports DDR3 with a triple-channel bus, while the Xeon D-1528 supports DDR3 and DDR4 with a dual-channel bus. The Core i7-980 does not support ECC memory, but the Xeon D-1528 does. The PCIe generation differs, with the Core i7-980 using Gen 2 and the Xeon D-1528 using Gen 3 with 24 lanes (CPU only). The market segments differ: the Core i7-980 is a desktop processor, while the Xeon D-1528 is a server/workstation processor. Production status differs, with the Core i7-980 being end-of-life and the Xeon D-1528 being active. The release dates differ, with the Core i7-980 released on 2011-06-25 and the Xeon D-1528 on 2015-10-31. The Core i7-980 has part number SLBYU, while the Xeon D-1528 has part number SR2DL. The launch MSRP for the Xeon D-1528 is $320, while the Core i7-980 has no listed launch MSRP.