Intel Core i7-3615QE vs Intel Xeon D-1521 Comparison

The Intel Core i7-3615QE and the Intel Xeon D-1521 are closely matched processors that target fundamentally different environments. Benchmark data from the database shows the Core i7-3615QE edges out the Xeon D-1521 in every recorded Cinebench test, but the Xeon D-1521 counters with platform features that the mobile part lacks. The Core i7-3615QE wins on raw rendering scores, while the Xeon D-1521 wins on server-oriented capabilities such as ECC memory support, a 14 nm process node, and active production status. For a user prioritizing maximum compute performance in a mobile form factor, the Core i7-3615QE is the choice. For a system requiring reliability features and modern fabrication in a server or workstation role, the Xeon D-1521 is the better fit.

Where Each One Wins

The benchmark results are decisively in favor of the Intel Core i7-3615QE across all six head-to-head Cinebench tests. In multi-core workloads, the Core i7-3615QE scores 481 in Cinebench R15, 2005 in R20, and 4774 in R23. The Xeon D-1521 trails by margins ranging from 1% to 1.1% in these same tests, with scores of 476, 1985, and 4728 respectively. Single-core performance follows the same pattern: the Core i7-3615QE posts 67 in R15, 283 in R20, and 674 in R23, while the Xeon D-1521 manages 67, 280, and 667. The largest recorded advantage for the Core i7-3615QE is a 1.1% lead in both Cinebench R15 multi-core and Cinebench R20 single-core. These deltas are small, but they are consistent across every workload in the database.

The Xeon D-1521 wins in areas that benchmarks do not capture. It supports DDR3 and DDR4 memory, while the Core i7-3615QE has no listed memory support. The Xeon D-1521 also includes ECC memory capability, a feature absent from the Core i7-3615QE. Its PCIe implementation is specified as Gen 3 with 24 lanes (CPU only), whereas the Core i7-3615QE has no PCIe data recorded. The Xeon D-1521 is built on a 14 nm process with 3,200 million transistors, compared to the Core i7-3615QE’s 22 nm process with 1,400 million transistors. The Xeon D-1521 is also an active production part, while the Core i7-3615QE has no production status listed. For server and workstation deployments, these differences are more meaningful than the single-digit percentage performance gap.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core i7-3615QE has an average benchmark score of 1381, while the Intel Xeon D-1521 has an average benchmark score of 1367. This places the Core i7-3615QE slightly ahead in overall recorded performance.

Q: Do the two processors differ in their nearest rivals?

A: Yes. The Core i7-3615QE’s nearest rivals include the AMD Opteron 6238 (average score 1383, delta -0.1%), AMD Opteron 6366 HE (1379, delta 0.1%), AMD Ryzen 3 PRO 2300U (1379, delta 0.2%), and AMD Ryzen 3 PRO 1200 (1379, delta 0.2%). The Xeon D-1521’s nearest rivals are the Intel Core i7-3820QM (1366, delta 0.1%), Intel Xeon E5-1410 v2 (1368, delta -0.1%), AMD Opteron 6376 (1370, delta -0.2%), and Intel Core i7-2600 (1370, delta -0.2%).

Q: How many wins does each processor have in head-to-head benchmarks?

A: The Intel Core i7-3615QE wins 6 of the 6 head-to-head Cinebench tests. The Intel Xeon D-1521 records 0 wins in these same comparisons.

Q: What is the largest performance gap between the two in any single benchmark?

A: The largest gap is 1.1%, recorded in two tests: Cinebench R15 multi-core (481 vs 476) and Cinebench R20 single-core (283 vs 280). All other deltas are either 0% or 1%.

Q: What memory capabilities does the Xeon D-1521 have that the Core i7-3615QE lacks?

A: The Xeon D-1521 supports both DDR3 and DDR4 memory and includes ECC memory support. The Core i7-3615QE has no memory support type listed and does not support ECC memory.

Q: How do the process nodes compare?

A: The Intel Core i7-3615QE is fabricated on a 22 nm process with 1,400 million transistors and a 160 mm² die size. The Intel Xeon D-1521 uses a 14 nm process with 3,200 million transistors and a 246 mm² die size.

Head-to-Head Benchmarks

The database records six head-to-head Cinebench comparisons between these two processors, and the Intel Core i7-3615QE wins every one. In Cinebench R15 multi-core, the Core i7-3615QE scores 481 against the Xeon D-1521’s 476, a 1.1% advantage. In Cinebench R15 single-core, both processors score 67, resulting in a 0% delta and a nominal win for the Core i7-3615QE. Moving to Cinebench R20, the Core i7-3615QE scores 2005 in multi-core versus 1985 for the Xeon D-1521, a 1% lead. In R20 single-core, the Core i7-3615QE scores 283 over 280, its largest single-core margin at 1.1%. Cinebench R23 multi-core shows the Core i7-3615QE at 4774 versus 4728, again a 1% difference. Finally, Cinebench R23 single-core has the Core i7-3615QE at 674 and the Xeon D-1521 at 667, a 1% gap.

These results indicate that the Core i7-3615QE holds a consistent, if modest, edge in rendering workloads. The performance delta never exceeds 1.1%, meaning the two processors are functionally equivalent in raw compute for most practical purposes. The Xeon D-1521’s lower boost clock of 2.70 GHz compared to the Core i7-3615QE’s 3.30 GHz likely contributes to this deficit, although the Xeon D-1521 has a higher base clock at 2.40 GHz versus 2.30 GHz. The data shows no scenario where the Xeon D-1521 overtakes the Core i7-3615QE in any of the recorded Cinebench tests.

Specification Differences

The two processors differ in several key specification fields. The Core i7-3615QE uses an Intel BGA 1023 socket, while the Xeon D-1521 uses an Intel BGA 1667 socket. Base clocks are 2.30 GHz for the Core i7-3615QE and 2.40 GHz for the Xeon D-1521. Boost clocks are 3.30 GHz for the Core i7-3615QE and 2.70 GHz for the Xeon D-1521. Both have a TDP of 45 watts. The Core i7-3615QE is an Ivy Bridge architecture part, while the Xeon D-1521 is Broadwell. The process nodes differ: 22 nm for the Core i7-3615QE versus 14 nm for the Xeon D-1521. Transistor counts are 1,400 million versus 3,200 million, and die sizes are 160 mm² versus 246 mm².

Cache configurations also vary. The Core i7-3615QE has 6 MB of shared L3 cache, while the Xeon D-1521 has 1.5 MB per core, which totals 6 MB across four cores. L1 and L2 caches are identical at 64 KB per core and 256 KB per core respectively. The Core i7-3615QE includes integrated graphics (Intel HD 4000), while the Xeon D-1521 has no integrated graphics listed. Memory support is absent for the Core i7-3615QE, but the Xeon D-1521 supports DDR3 and DDR4. ECC memory is false for the Core i7-3615QE and true for the Xeon D-1521. The market segments differ: Mobile for the Core i7-3615QE versus Server/Workstation for the Xeon D-1521. The Core i7-3615QE has no production status, while the Xeon D-1521 is Active. Release dates are 2012-04-28 for the Core i7-3615QE and 2015-10-31 for the Xeon D-1521. The Xeon D-1521 has a launch MSRP of $199, while the Core i7-3615QE has no listed launch MSRP.

Architecture Differences

The architectural divide between these parts is substantial. The Core i7-3615QE is built on Ivy Bridge, a 22 nm architecture with 1,400 million transistors on a 160 mm² die. The Xeon D-1521 uses Broadwell, a 14 nm architecture with 3,200 million transistors on a 246 mm² die. The smaller process node allows the Xeon D-1521 to pack more than twice the transistor count into a larger die, yet both processors maintain a 45 watt TDP. The Core i7-3615QE features a shared 6 MB L3 cache, while the Xeon D-1521 distributes its L3 as 1.5 MB per core. Both have 4 cores and 8 threads, and both use dual-channel memory buses. The Xeon D-1521 also supports ECC memory, a critical feature for data integrity in server environments, and its PCIe implementation is listed as Gen 3 with 24 lanes (CPU only). The Core i7-3615QE lacks PCIe data entirely.

The integrated graphics difference is notable. The Core i7-3615QE includes Intel HD 4000, making it suitable for mobile systems without a discrete GPU. The Xeon D-1521 has no integrated graphics, reflecting its server/workstation orientation where a dedicated GPU or remote management is expected. The Xeon D-1521’s memory support for both DDR3 and DDR4 adds flexibility for system builders, while the Core i7-3615QE’s memory support is unlisted. The production status also differs: the Xeon D-1521 is an active production part, whereas the Core i7-3615QE has no status recorded, suggesting it is a legacy mobile processor. These architectural choices explain why the Xeon D-1521, despite losing all benchmark comparisons, remains relevant for specific deployments.

The Verdict

The benchmark data is unambiguous: the Intel Core i7-3615QE outperforms the Intel Xeon D-1521 in every recorded Cinebench test. The Core i7-3615QE wins 6 of 6 head-to-head comparisons, with margins of 1% to 1.1% in most tests and a 0% delta in Cinebench R15 single-core. Its average benchmark score of 1381 also edges out the Xeon D-1521’s 1367. Both processors occupy the 36th percentile against all CPUs in the database, indicating similar overall standing. For anyone selecting purely on rendering performance, the Core i7-3615QE is the superior part.

However, the Xeon D-1521 is not a direct competitor in the same market. Its 14 nm process, 3,200 million transistors, ECC memory support, DDR3 and DDR4 compatibility, and active production status make it a server/workstation processor. The Core i7-3615QE is a mobile part with integrated graphics and a 22 nm process. The Xeon D-1521 also has a launch MSRP of $199, while the Core i7-3615QE has no listed price. The choice depends on the deployment target. A mobile system benefits from the Core i7-3615QE’s slightly higher benchmark scores and built-in Intel HD 4000. A server or workstation requires the Xeon D-1521’s ECC memory, broader memory support, and modern fabrication. The data shows a performance leader, but the specification differences reveal a platform leader.