Intel Core i7-3770K vs Intel Xeon D-1528 Comparison

The Intel Core i7-3770K and Intel Xeon D-1528 are both Intel parts, but they target completely different corners of the market. The i7-3770K is a desktop enthusiast chip from the Ivy Bridge era, while the Xeon D-1528 is a low-power server processor built on Broadwell. Benchmark results show that despite the age and market differences, the Xeon D-1528 consistently edges out the i7-3770K in every head-to-head test. The data shows a clear, if modest, performance advantage for the server part across all Cinebench workloads.

Head-to-Head Benchmarks

The Xeon D-1528 wins all six head-to-head benchmark comparisons, but the margins are tight. In Cinebench R15 multicore, the Xeon scores 584 against the i7-3770K’s 558, a 4.5% lead. The single-core R15 test shows a similar story: 82 for the Xeon versus 78 for the i7, a 4.9% difference. This pattern holds steady in newer Cinebench versions. In R20 multicore, the Xeon posts 2435 versus 2327, a 4.4% advantage. The R20 single-core result is 343 versus 328, also a 4.4% lead.

The Cinebench R23 results reinforce the trend. The Xeon D-1528 scores 5799 in multicore, while the i7-3770K manages 5542, again a 4.4% gap. In single-core R23, the Xeon hits 818, and the i7 trails at 782, with the same 4.4% delta. The consistency of these numbers is notable. Whether the workload is single-threaded or multi-threaded, and regardless of the Cinebench version, the Xeon D-1528 holds a roughly 4.4% to 4.9% edge.

The i7-3770K does have one benchmark category where it is competitive: Geekbench. The i7 scores 3027 in multicore and 860 in single-core. However, the Xeon D-1528 has no Geekbench results in the data pack, so no direct comparison is possible there. The average benchmark score tells a slightly different story. The i7-3770K has an average score of 1688, while the Xeon D-1528 averages 1677. That puts the i7 about 0.6% ahead on average, but this figure includes the Geekbench results that the Xeon lacks. Looking strictly at the head-to-head Cinebench tests, the Xeon is the faster chip.

FAQ

Q: Which CPU has the higher single-core performance?

A: The Intel Xeon D-1528 wins every single-core Cinebench test. In R15, it scores 82 versus 78 for the i7-3770K, a 4.9% lead. In R20 and R23, the margins are 4.4% in favor of the Xeon (343 vs 328 and 818 vs 782, respectively).

Q: Is the i7-3770K better for multi-threaded workloads?

A: No. The Xeon D-1528 wins all multi-core Cinebench tests as well. It scores 584 vs 558 in R15, 2435 vs 2327 in R20, and 5799 vs 5542 in R23. The Xeon’s lead is consistently 4.4% to 4.5% across these tests.

Q: How do their average benchmark scores compare?

A: The i7-3770K has a slightly higher average benchmark score of 1688, versus 1677 for the Xeon D-1528. This 0.6% difference is driven by the i7’s Geekbench results, which the Xeon does not have in the data. The head-to-head Cinebench results still favor the Xeon.

Q: Which CPU supports ECC memory?

A: The Xeon D-1528 supports ECC memory, while the i7-3770K does not. This makes the Xeon a more appropriate choice for server or workstation environments where data integrity is critical.

Q: Do both CPUs have the same socket?

A: No. The i7-3770K uses Intel Socket 1155, while the Xeon D-1528 uses Intel BGA 1667. They are not interchangeable.

Q: Which processor has more cores?

A: The Xeon D-1528 has 6 cores and 12 threads, while the i7-3770K has 4 cores and 8 threads. Despite having fewer cores, the i7 still posts competitive benchmark scores due to its higher clock speeds.

Architecture Differences

The two processors come from different architectural generations. The i7-3770K is based on Ivy Bridge, built on Intel’s 22 nm process. The Xeon D-1528 uses Broadwell, which is a 14 nm design. The newer process node allows the Xeon to pack more transistors: 3,200 million versus 1,400 million for the i7. The die size also reflects this, with the Xeon measuring 246 mm² compared to 160 mm² for the i7.

Cache organization differs significantly. Both have 64 KB of L1 and 256 KB of L2 per core. The L3 cache is where they diverge. The i7-3770K has 8 MB of shared L3 cache. The Xeon D-1528 instead provides 1.5 MB of L3 per core, which amounts to 9 MB total for its 6 cores. This per-core allocation can be beneficial for workloads that need consistent cache access across cores.

The Xeon D-1528 also features a lower TDP of 35 watts, compared to 77 watts for the i7-3770K. This is a major architectural advantage for dense server deployments where heat and power are constrained. The i7-3770K includes integrated graphics (Intel HD 4000), while the Xeon D-1528 has no integrated graphics at all. This is typical for server parts, which rely on discrete GPUs or headless operation.

Specification Differences

The specifications that differ between the two CPUs are clear. The i7-3770K has 4 cores and 8 threads, while the Xeon D-1528 has 6 cores and 12 threads. Base clock speeds are starkly different: the i7 runs at 3.50 GHz base and 3.90 GHz boost, while the Xeon runs at 1900.00 MHz base and 2.50 GHz boost. The Xeon’s clock figures are lower, but it compensates with more cores.

Memory support is another differentiator. The i7-3770K only supports DDR3, while the Xeon D-1528 supports both DDR3 and DDR4. The i7 has a dual-channel memory bus with 25.6 GB/s bandwidth. The Xeon also has a dual-channel bus, but its bandwidth is not listed in the data. ECC memory support is exclusive to the Xeon D-1528.

PCIe lane counts differ as well. The i7-3770K provides Gen 3 with 16 lanes (CPU only), while the Xeon D-1528 provides Gen 3 with 24 lanes (CPU only). This gives the Xeon more headroom for additional peripherals or storage controllers. The i7 has an unlocked multiplier, while the Xeon is locked. Finally, the i7-3770K is an end-of-life desktop part, whereas the Xeon D-1528 is an active server/workstation product.

The Verdict

The benchmark data is unambiguous: the Intel Xeon D-1528 is the faster processor in every head-to-head Cinebench test. It wins all six comparisons with margins ranging from 4.4% to 4.9%. The Xeon’s advantage is consistent across single-core and multi-core workloads. The i7-3770K only leads in the average benchmark score, and that is solely due to its Geekbench results, which the Xeon does not have.

The choice between these two comes down to platform and priorities. The i7-3770K is a desktop CPU with integrated graphics and an unlocked multiplier, making it suitable for overclocking in a standard 1155 motherboard. The Xeon D-1528 is a server part with ECC memory support, a lower TDP, and more PCIe lanes, but it is BGA-soldered and lacks integrated graphics. If raw performance in Cinebench is the sole criterion, the Xeon D-1528 is the pick.

Where Each One Wins

The Xeon D-1528 wins in every single benchmark test that directly compares the two. It is the better choice for multi-threaded rendering tasks, as shown by its consistent 4.4% lead in Cinebench R15, R20, and R23 multicore tests. It also wins single-threaded workloads by the same margin. For server environments, the Xeon’s ECC memory support, 24 PCIe lanes, and 35-watt TDP make it the obvious choice. Its support for DDR4 memory adds future-proofing potential.

The i7-3770K has no benchmark wins in the head-to-head data. However, it does have some practical advantages. It includes integrated graphics, which the Xeon lacks, so it can run a display without a discrete GPU. The i7 also has an unlocked multiplier, allowing for overclocking, whereas the Xeon is locked. The i7’s higher base and boost clocks (3.50 GHz and 3.90 GHz versus 1900.00 MHz and 2.50 GHz) give it a clock-speed advantage that may help in lightly threaded applications where the Xeon’s extra cores are not utilized. The i7’s average benchmark score of 1688 is also higher than the Xeon’s 1677, though this is driven by Geekbench results that are not available for the Xeon. For a desktop user with a 1155 motherboard and a need for integrated graphics, the i7-3770K remains a functional option, but the data shows the Xeon D-1528 is the stronger performer.