Intel Core i7-7740X vs Intel Xeon D-1577 Comparison

The Verdict

The Intel Xeon D-1577 is the outright winner in every recorded benchmark comparison against the Intel Core i7-7740X. The head-to-head data shows six benchmark victories for the Xeon D-1577, with no wins for the Core i7-7740X. Across Cinebench R15, R20, and R23, the Xeon D-1577 consistently leads by margins between 12.0% and 12.2% in both single-core and multi-core tests. The average benchmark score reinforces this: the Xeon D-1577 sits at 2715, while the Core i7-7740X trails at 2648. Both processors occupy the 50th percentile among all CPUs in the database, but the Xeon D-1577 outperforms its rival in every measurable test.

The Core i7-7740X is a desktop part aimed at users who prioritize a high-frequency, low-core-count experience. Its 4.30 GHz base clock and 4.60 GHz boost clock deliver strong single-threaded responsiveness, but the recorded data shows it falls behind the Xeon D-1577 even in single-core workloads. The Xeon D-1577, despite a much lower 1300.00 MHz base clock, achieves higher single-core scores in every Cinebench version tested. This suggests the Xeon's architecture and boost behavior compensate for its lower base frequency in real-world rendering tasks.

For workloads that scale across many threads, the Xeon D-1577 is the clear choice. It offers 16 cores and 32 threads versus the Core i7-7740X's 4 cores and 8 threads. The multi-core benchmark deltas are consistent: 12.1% to 12.2% ahead in R20 and R23 multi-core, and 12.1% ahead in R15 multi-core. The Xeon D-1577 also supports ECC memory, a feature absent from the Core i7-7740X, making it suitable for reliability-sensitive server or workstation environments. The Core i7-7740X, with its unlocked multiplier and quad-channel DDR4 support, remains a functional desktop option, but the data does not favor it in any tested workload.

Architecture Differences

The two processors come from different Intel microarchitectures and target entirely different market segments. The Core i7-7740X uses the Kaby Lake architecture, specifically the Kaby Lake-X variant, and belongs to the Core i7 X-Series 7th Generation family. The Xeon D-1577 uses the Broadwell architecture, specifically the Broadwell-DE server variant. Both are built on Intel's 14 nm process node and manufactured by Intel, but their design philosophies diverge sharply.

The Core i7-7740X features 4 cores and 8 threads, with a base clock of 4.30 GHz and a boost clock of 4.60 GHz. It has a 112 W TDP and fits the Intel Socket 2066. The Xeon D-1577, by contrast, packs 16 cores and 32 threads, with a base clock of 1300.00 MHz and a boost clock of 2.10 GHz. Its TDP is dramatically lower at 45 W, and it uses the Intel BGA 1667 socket, which reflects its embedded/server orientation. The Xeon D-1577 is listed with 3,200 million transistors and a die size of 246 mm², while the Core i7-7740X has no transistor or die size data recorded.

Cache layouts also differ. Both have 64 KB of L1 cache and 256 KB of L2 cache per core. The Core i7-7740X has 8 MB of shared L3 cache. The Xeon D-1577 has 1.5 MB of L3 cache per core, which across 16 cores amounts to a much larger total L3 footprint. Memory support varies as well: the Core i7-7740X supports DDR4 with a quad-channel memory bus, while the Xeon D-1577 supports both DDR3 and DDR4 with a dual-channel bus. ECC memory is supported only on the Xeon D-1577. PCIe connectivity is Gen 3 on both, but the Xeon D-1577 specifies 24 lanes (CPU only). The Core i7-7740X has an unlocked multiplier, while the Xeon D-1577 is locked.

The release dates differ by over a year. The Core i7-7740X launched on 2017-06-25, while the Xeon D-1577 launched earlier on 2016-02-23. The Xeon D-1577 carries the part number SR2M2 and has a launch MSRP of 1379. The Core i7-7740X has no recorded launch MSRP. The production status for both is listed as Active.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon D-1577 has 16 cores and 32 threads. The Intel Core i7-7740X has 4 cores and 8 threads.

Q: How much faster is the Xeon D-1577 in multi-core rendering?

A: In Cinebench R23 multi-core, the Xeon D-1577 scores 9389 versus the Core i7-7740X's 8250, a 12.1% advantage. In Cinebench R20 multi-core, the Xeon D-1577 scores 3943 versus 3465, also 12.1% ahead. In Cinebench R15 multi-core, the Xeon D-1577 scores 946 versus 831, a 12.1% lead.

Q: Does the Xeon D-1577 also win in single-core tests?

A: Yes. The Xeon D-1577 wins every single-core test recorded. In Cinebench R15 single-core, it scores 133 versus 117 (12% ahead). In R20 single-core, it scores 556 versus 488 (12.2% ahead). In R23 single-core, it scores 1325 versus 1164 (12.2% ahead).

Q: What memory features differ between the two?

A: The Core i7-7740X supports DDR4 with a quad-channel memory bus and no ECC support. The Xeon D-1577 supports both DDR3 and DDR4 with a dual-channel memory bus and includes ECC memory support.

Q: Which processor has a higher TDP?

A: The Core i7-7740X has a TDP of 112 W. The Xeon D-1577 has a TDP of 45 W, which is significantly lower.

Q: What socket does each processor use?

A: The Core i7-7740X uses Intel Socket 2066. The Xeon D-1577 uses Intel BGA 1667.

Specification Differences

The two processors differ across nearly every specification category. The Core i7-7740X has 4 cores and 8 threads, while the Xeon D-1577 has 16 cores and 32 threads. Base clocks diverge substantially: 4.30 GHz for the Core i7-7740X versus 1300.00 MHz for the Xeon D-1577. Boost clocks are 4.60 GHz and 2.10 GHz respectively. TDP is 112 W for the desktop part and 45 W for the server part. Sockets differ: Intel Socket 2066 versus Intel BGA 1667. The architecture is Kaby Lake versus Broadwell, with codenames Kaby Lake-X and Broadwell respectively. The generation is Core i7 X-Series 7th Gen versus Xeon D Broadwell-DE. Process node is identical at 14 nm, and both are manufactured by Intel.

The Xeon D-1577 has recorded transistor count of 3,200 million and die size of 246 mm², while the Core i7-7740X has no data for either field. L1 and L2 cache are identical per core (64 KB and 256 KB). L3 cache differs: 8 MB shared on the Core i7-7740X versus 1.5 MB per core on the Xeon D-1577. Memory support: DDR4 only for the Core i7-7740X, DDR3 and DDR4 for the Xeon D-1577. Memory bus: quad-channel versus dual-channel. ECC memory is false for the Core i7-7740X and true for the Xeon D-1577. PCIe is Gen 3 on both, but the Xeon D-1577 specifies 24 lanes (CPU only). Market segment is Desktop for the Core i7-7740X and Server/Workstation for the Xeon D-1577. Release dates: 2017-06-25 versus 2016-02-23. The multiplier is unlocked on the Core i7-7740X and locked on the Xeon D-1577. The Xeon D-1577 has part number SR2M2 and a launch MSRP of 1379. The Core i7-7740X has neither.

Head-to-Head Benchmarks

The head-to-head benchmark data covers six Cinebench tests, and the Xeon D-1577 wins all six. In Cinebench R15 multi-core, the Xeon D-1577 scores 946 against the Core i7-7740X's 831, a delta of 12.1% in favor of the Xeon. In R15 single-core, the Xeon D-1577 scores 133 against 117, a 12% lead. The R20 multi-core test shows 3943 versus 3465, a 12.1% margin. The R20 single-core test shows 556 versus 488, a 12.2% margin. The R23 multi-core test shows 9389 versus 8250, a 12.1% margin. The R23 single-core test shows 1325 versus 1164, a 12.2% margin.

These deltas are remarkably consistent. The Xeon D-1577 leads by roughly 12% in every single test, whether single-core or multi-core. The Core i7-7740X's highest relative performance appears in R15 multi-core, where it still trails by 12.1%. The largest margin for the Xeon D-1577 is 12.2%, appearing in R20 single-core and R23 single-core. The smallest margin is 12%, appearing in R15 single-core. The overall benchmark scores reinforce this pattern: the Xeon D-1577's average benchmark score is 2715, while the Core i7-7740X averages 2648. The nearest rivals for the Core i7-7740X include the Intel Xeon E-2274G at 2643 (0.2% delta), the Intel Core i7-5820K at 2642 (0.2% delta), the Intel Core i9-8950HK at 2641 (0.3% delta), and the Intel Core i7-1195G7 at 2638 (0.4% delta). The nearest rivals for the Xeon D-1577 include the Intel Core i7-11390H at 2715 (0% delta), the AMD Ryzen 5 PRO 5650U at 2713 (0.1% delta), the Intel Xeon E-2226G at 2709 (0.2% delta), and the AMD Ryzen 7 4700U at 2722 (-0.2% delta).

Where Each One Wins

The Intel Xeon D-1577 wins every recorded benchmark, so the use-case split is largely one-sided. For multi-threaded rendering workloads, the Xeon D-1577's 16 cores and 32 threads provide a 12.1% advantage in Cinebench R15, R20, and R23 multi-core tests. For single-threaded tasks, the Xeon D-1577 still leads by 12% to 12.2%, despite the Core i7-7740X's higher base and boost clocks. The Xeon D-1577 also offers ECC memory support, which the Core i7-7740X lacks, making it the appropriate choice for server or workstation environments where data integrity is critical. Its 45 W TDP is substantially lower than the Core i7-7740X's 112 W, which may be relevant for densely packed or power-constrained deployments. The Xeon D-1577's dual-channel memory bus supports both DDR3 and DDR4, providing flexibility in existing server infrastructure.

The Core i7-7740X has no benchmark wins in the recorded data. Its strengths are qualitative: an unlocked multiplier for overclocking, quad-channel DDR4 memory support, and a desktop-oriented socket (Intel Socket 2066) that allows for conventional motherboard integration. Its higher base clock of 4.30 GHz and boost clock of 4.60 GHz do not translate into benchmark victories, as the Xeon D-1577 outperforms it in every Cinebench test. For users who specifically require an unlocked desktop processor with quad-channel memory and do not need ECC support, the Core i7-7740X remains a viable option. However, based on the recorded measurements, the Xeon D-1577 is the superior processor across all tested workloads.