Intel Core i7-8665U vs Intel Xeon E5-1428L v2 Comparison

The Intel Xeon E5-1428L v2 and the Intel Core i7-8665U are two end-of-life processors from different Intel eras, yet benchmark results place them in the same performance tier. The data shows the Xeon wins all six Cinebench head-to-head comparisons, but the margin is consistently narrow, between 1.4% and 1.9%. Both CPUs sit at the 38th percentile of all CPUs, with average benchmark scores of 1537 and 1513, respectively. The choice between them is not about raw speed, which is nearly identical, but about platform characteristics: one is a low-power mobile chip with integrated graphics, the other is a server part with ECC memory support and a triple-channel memory bus.

Where Each One Wins

The Intel Xeon E5-1428L v2 takes a clean sweep in every benchmark category recorded, but the victories are slim. In multi-core workloads, it leads the Core i7-8665U by 1.5% in Cinebench R15 (535 vs 527), by 1.6% in Cinebench R20 (2232 vs 2197), and by 1.6% in Cinebench R23 (5316 vs 5232). This consistent edge stems from its six physical cores and twelve threads, which provide more parallel execution resources than the Core i7's four cores and eight threads. Single-core results follow the same pattern: the Xeon wins by 1.4% in R15 (75 vs 74), by 1.9% in R20 (315 vs 309), and by 1.6% in R23 (750 vs 738). Despite the Core i7's much higher boost clock, the Xeon's older Ivy Bridge architecture manages to edge it out in every single-threaded test.

The Core i7-8665U wins on platform flexibility and power efficiency, though not on benchmark scores. Its 15 W TDP is a fraction of the Xeon's 60 W, making it suitable for compact mobile designs. It integrates UHD Graphics 620, eliminating the need for a discrete GPU in basic display tasks. The Core i7 also supports both DDR3 and DDR4 memory, while the Xeon is limited to DDR3. In multi-core performance, the Core i7 trails by margins that would be imperceptible in real-world use; a 1.5% difference in Cinebench R15 translates to a single-digit point gap. The Xeon's advantage is real but marginal, meaning the Core i7's lower power draw and integrated graphics are more meaningful differentiators for many use cases.

The Verdict

Pick the Intel Xeon E5-1428L v2 if the workload demands maximum thread count and server-grade reliability. Its six cores and twelve threads give it a structural advantage over the Core i7's four cores and eight threads, even if benchmark scores show only a 1.4% to 1.9% lead. The Xeon supports ECC memory, which is critical for data integrity in server or workstation environments. Its triple-channel DDR3 memory bus provides a wider path for memory-intensive tasks, and its 15 MB shared L3 cache is nearly double the Core i7's 8 MB. The Xeon also offers more PCIe lanes, 24 versus 16, which matters for systems with multiple expansion cards.

Pick the Intel Core i7-8665U if power consumption and integrated graphics are priorities. At 15 W TDP, it uses one-quarter the power of the Xeon, making it ideal for laptops and compact systems where thermal and battery constraints dominate. The integrated UHD Graphics 620 means the CPU alone can handle display output, a capability the Xeon lacks entirely. For users who need a balance of CPU and GPU in a small form factor, the Core i7 is the practical choice. In benchmark terms, the Core i7's average score of 1513 is only 1.6% behind the Xeon's 1537, a negligible difference for most applications. The Core i7's higher boost clock of 4.80 GHz versus 2.70 GHz suggests it may respond more quickly to short bursts of activity, even though sustained single-threaded benchmarks slightly favor the Xeon.

Head-to-Head Benchmarks

The largest win for the Intel Xeon E5-1428L v2 comes in Cinebench R20 single-core, where it posts 315 versus the Core i7's 309, a 1.9% delta. That is the widest margin in any test. The smallest win is in Cinebench R15 single-core: 75 versus 74, a 1.4% delta. Multi-core results are consistently in the 1.5% to 1.6% range. In Cinebench R15 multi-core, the Xeon scores 535 against 527 (1.5%). In Cinebench R20 multi-core, it is 2232 against 2197 (1.6%). In Cinebench R23 multi-core, 5316 against 5232 (1.6%). The Xeon also wins Cinebench R23 single-core by 1.6%, scoring 750 versus 738.

The Core i7-8665U never wins a single benchmark in this head-to-head comparison. However, examining the rival data shows both CPUs are tightly clustered with similar processors. The Xeon's nearest rival, the Intel Core i7-4760HQ, scores 1549, which is 0.8% higher than the Xeon's 1537. The Core i7-8665U's nearest rival, the Intel Pentium Gold G7400E, scores 1524, which is 0.7% higher than the Core i7's 1513. This indicates the Core i7-8665U is slightly below the Xeon not just in direct comparison but also relative to their respective peer groups. The Xeon edges out the Intel Core i5-7440HQ (1527) and Intel Core i5-4670S (1526) by 0.7% each, while the Core i7-8665U trails those same chips by 0.9%.

FAQ

Q: Which processor is faster in multi-core benchmarks?

A: The Intel Xeon E5-1428L v2 wins all three multi-core tests. It scores 535 vs 527 in Cinebench R15 (1.5% lead), 2232 vs 2197 in Cinebench R20 (1.6% lead), and 5316 vs 5232 in Cinebench R23 (1.6% lead).

Q: Does the Core i7-8665U win any benchmark?

A: No. In the six head-to-head Cinebench tests, the Xeon wins all six. The Core i7's best result is a 1.4% deficit in Cinebench R15 single-core (74 vs 75), while its largest deficit is 1.9% in Cinebench R20 single-core (309 vs 315).

Q: How do these CPUs compare to their nearest rivals?

A: The Xeon's average score of 1537 is 0.7% higher than the Intel Core i5-7440HQ (1527) and 0.7% higher than the Intel Core i5-4670S (1526), but 0.8% lower than the Intel Core i7-4760HQ (1549). The Core i7-8665U's average score of 1513 is 0.7% lower than the Intel Pentium Gold G7400E (1524), 0.9% lower than the Intel Core i5-4670S (1526), and 0.9% lower than the Intel Core i5-7440HQ (1527).

Q: What are the memory support differences?

A: The Xeon E5-1428L v2 supports DDR3 with a triple-channel memory bus and 32.0 GB/s bandwidth. The Core i7-8665U supports both DDR3 and DDR4 with a dual-channel bus and higher 38.4 GB/s bandwidth. The Xeon supports ECC memory; the Core i7 does not.

Q: Which processor has more cores and threads?

A: The Xeon E5-1428L v2 has six cores and twelve threads. The Core i7-8665U has four cores and eight threads. The Xeon also has a larger shared L3 cache of 15 MB compared to the Core i7's 8 MB.

Q: What about integrated graphics?

A: The Core i7-8665U includes UHD Graphics 620. The Xeon E5-1428L v2 has no integrated graphics, requiring a discrete GPU for display output.

Architecture Differences

The Xeon E5-1428L v2 is built on Ivy Bridge, specifically the Ivy Bridge-EN codename, using a 22 nm process node manufactured by Intel. It packs 1,860 million transistors on a 257 mm² die. The Core i7-8665U uses Whiskey Lake architecture, codename Whiskey Lake-U, on a 14 nm process node. The Core i7's transistor count and die size are not listed in the data. The Xeon's architecture is older but designed for server workloads, evidenced by its ECC memory support and triple-channel memory bus. The Core i7's Whiskey Lake architecture is newer and optimized for mobile efficiency, with a 15 W TDP and integrated UHD Graphics 620. Both CPUs use a per-core L1 cache of 64 KB and per-core L2 cache of 256 KB. The Xeon's shared L3 cache is 15 MB, while the Core i7's is 8 MB. The Xeon supports PCIe Gen 3 with 24 lanes, while the Core i7 provides PCIe Gen 3 with 16 lanes. The Xeon's market segment is server/workstation, while the Core i7 targets mobile devices.

Specification Differences

The two processors differ in nearly every major specification category. Core count: 6 (Xeon) vs 4 (Core i7). Threads: 12 vs 8. Base clock: 2.20 GHz vs 1900.00 MHz. Boost clock: 2.70 GHz vs 4.80 GHz. TDP: 60 W vs 15 W. Socket: Intel Socket 1356 vs Intel BGA 1528. Process node: 22 nm vs 14 nm. Memory support: DDR3 only vs DDR3 and DDR4. Memory bus: Triple-channel vs Dual-channel. Memory bandwidth: 32.0 GB/s vs 38.4 GB/s. ECC memory: true vs false. PCIe lanes: 24 vs 16. Integrated graphics: none vs UHD Graphics 620. Market segment: Server/Workstation vs Mobile. Release date: January 8, 2014 vs September 30, 2018. Launch MSRP: $494 vs $409. Neither processor has an unlocked multiplier. The Xeon's part number is SR1B9; the Core i7's is SRF9W. Both are end-of-life products.