Intel Core i7-880 vs Intel Xeon W3565 Comparison

Where Each One Wins

The benchmark data paints a remarkably consistent picture for these two Nehalem-era processors. Across every recorded Cinebench test, the Intel Core i7-880 posts the higher score. There is no single workload category where the Xeon W3565 takes a lead; the i7-880 wins all five head-to-head comparisons. This is not a case of one chip dominating in multi-threaded tasks while the other wins single-threaded. The i7-880 holds a narrow but uniform advantage in both multi-core and single-core rendering workloads.

The Core i7-880's wins are all modest in scale. In Cinebench R15 multi-core, the i7-880 scores 294 against the Xeon's 290, a delta of 1.4%. In Cinebench R20 multi-core, the gap is 1227 versus 1212, or 1.2%. The single-core tests show the same pattern: Cinebench R20 single-core favors the i7-880 at 173 versus 170 (1.8%), and Cinebench R23 single-core shows 412 versus 407 (1.2%). The largest relative advantage, 1.8%, appears in the R20 single-core test, but even that is a slim margin. There is no scenario in the recorded data where the Xeon W3565 is the better choice based on performance alone.

The average benchmark scores reinforce this hierarchy. The i7-880 has an average benchmark score of 1006, while the Xeon W3565 sits at 993. Both processors land in the 27th percentile among all CPUs in the database, meaning they occupy the same performance tier relative to the broader market. The i7-880's nearest rivals in the database are the Intel Core i5-10210Y and AMD FX-9830P, each with an identical average score of 1006 and a delta of 0%. The Xeon W3565's closest neighbors are the Intel Core i7-965, AMD Phenom II X6 1065T, and Intel Core i7-960, all at 993 with a 0% delta. These rival groupings show that both chips are firmly anchored in the same competitive bracket, with the i7-880 holding a slight edge at the top of that bracket.

Architecture Differences

Both processors are built on Intel's 45 nm Nehalem architecture, but they come from different design families. The Core i7-880 uses the Lynnfield codename and fits the Intel Socket 1156. The Xeon W3565 is a Bloomfield part and uses the larger Intel Socket 1366. The die sizes and transistor counts differ. The i7-880 contains 774 million transistors on a 296 mm² die, while the Xeon W3565 has 731 million transistors on a 263 mm² die. Despite the Xeon's smaller physical footprint, the i7-880 carries more transistors, which is reflected in its slightly higher transistor density.

Core and thread counts are identical: both have 4 physical cores and 8 threads. Cache hierarchies also match. Each core has 64 KB of L1 cache and 256 KB of L2 cache, and both chips share 8 MB of L3 cache. The base and boost clocks are where the differences appear. The i7-880 runs at a base clock of 3.07 GHz with a boost of 3.73 GHz. The Xeon W3565 has a higher base clock of 3.20 GHz but a lower boost of 3.47 GHz. The i7-880's boost advantage of 0.26 GHz likely explains its consistent wins in single-core tests, despite the Xeon's higher idle-to-load base frequency.

Memory support is a notable divergence. Both support DDR3, but the i7-880 uses a dual-channel memory bus while the Xeon W3565 uses a triple-channel configuration. The Xeon also supports ECC memory, a feature absent from the i7-880. The PCIe implementation differs as well: the i7-880 offers PCIe Gen 2 with 16 lanes from the CPU only, while the Xeon W3565 lists PCIe Gen 2 without a specified lane count. Thermal design power is substantially different, with the i7-880 rated at 95 watts and the Xeon W3565 at 130 watts, reflecting the server/workstation positioning of the latter.

Market segments further separate the pair. The i7-880 is a desktop part, while the Xeon W3565 is aimed at server and workstation platforms. The Xeon's triple-channel memory and ECC support are hallmarks of its intended role in reliability-focused environments. The i7-880, by contrast, is a mainstream desktop processor with a lower TDP and a more consumer-oriented feature set. Both are end-of-life products, with the i7-880 released in May 2010 and the Xeon W3565 released in October 2009. Neither has an unlocked multiplier, and neither includes integrated graphics.

Head-to-Head Benchmarks

The recorded head-to-head data shows a clean sweep for the Core i7-880, but the margins are tight enough that the Xeon W3565 is never far behind. In Cinebench R15 multi-core, the i7-880 scores 294 against 290, winning by 1.4%. This is the smallest absolute gap in the dataset, just four points. The R20 multi-core test widens the gap slightly: 1227 versus 1212, a 1.2% delta in favor of the i7-880. The R23 multi-core test follows the same pattern, with the i7-880 at 2923 and the Xeon at 2888, again a 1.2% difference.

Single-core results are equally one-sided. Cinebench R20 single-core gives the i7-880 a 173 score and the Xeon a 170 score, a 1.8% advantage. Cinebench R23 single-core shows 412 versus 407, a 1.2% delta. The consistency of these deltas is striking. Across five tests, the i7-880's advantage ranges from 1.2% to 1.8%, with no test producing a larger swing. This suggests a fundamental clock-driven edge rather than an architectural superiority, given the i7-880's 3.73 GHz boost versus the Xeon's 3.47 GHz boost.

The Xeon W3565's higher base clock of 3.20 GHz does not translate into benchmark wins. In every recorded test, the i7-880's higher boost clock carries the day. The data indicates that the workloads in these Cinebench tests respond more to the maximum frequency than to the sustained base frequency. The Xeon's triple-channel memory and ECC support, while important for its platform role, do not influence these CPU-bound rendering scores. The i7-880's 1.8% win in R20 single-core is its largest margin, and it aligns with the 0.26 GHz boost clock difference. The multi-core margins of 1.2% to 1.4% are slightly smaller, which is expected for a 4-core, 8-thread chip where memory bandwidth and thermal headroom play a larger role.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core i7-880 has an average benchmark score of 1006, while the Intel Xeon W3565 has an average score of 993.

Q: How much faster is the Core i7-880 in Cinebench R23 multi-core?

A: The i7-880 scores 2923 versus the Xeon W3565's 2888, a delta of 1.2%.

Q: Do both processors have the same core and thread counts?

A: Yes, both have 4 cores and 8 threads.

Q: What memory features does the Xeon W3565 support that the i7-880 does not?

A: The Xeon W3565 supports ECC memory and uses a triple-channel memory bus, while the i7-880 uses a dual-channel bus and lacks ECC support.

Q: What is the base clock of each processor?

A: The Core i7-880 has a base clock of 3.07 GHz, and the Xeon W3565 has a base clock of 3.20 GHz.

Q: Which processor has a higher boost clock?

A: The Core i7-880 has a boost clock of 3.73 GHz, which is higher than the Xeon W3565's boost clock of 3.47 GHz.

The Verdict

The database results are unambiguous: the Intel Core i7-880 is the faster processor in every benchmark category recorded. It wins all five head-to-head comparisons, with margins ranging from 1.2% to 1.8%. Its average benchmark score of 1006 exceeds the Xeon W3565's 993 by a small but consistent margin. The i7-880's higher boost clock of 3.73 GHz, compared to the Xeon's 3.47 GHz, is the clearest driver of this performance advantage in both single-core and multi-core Cinebench tests.

For a desktop user seeking the best raw rendering performance from these two options, the Core i7-880 is the clear pick. Its lower TDP of 95 watts versus 130 watts is an additional practical benefit, though the data does not quantify thermals directly. The Xeon W3565, however, is not without a rationale. Its triple-channel memory bus and ECC memory support make it the appropriate choice for a server or workstation platform where memory reliability and bandwidth are priorities. The Xeon's higher base clock of 3.20 GHz does not help it win benchmarks, but its feature set targets a different use case than pure Cinebench scores.

The choice depends on platform priorities. If the goal is maximum CPU rendering performance and lower power draw, the Core i7-880 wins on every recorded metric. If the goal is a server-class feature set with ECC memory and triple-channel bandwidth, the Xeon W3565 offers capabilities the i7-880 simply does not have. Neither chip is a performance outlier; both sit in the 27th percentile among all CPUs, and their nearest rivals are similarly aged parts. The i7-880 is the faster chip, but the Xeon W3565 is the more feature-complete platform processor. The data does not support picking the Xeon for speed, only for its memory and reliability advantages.