AMD Opteron 6366 HE vs Intel Xeon D-1521 Comparison

Where Each One Wins

The benchmark data splits cleanly by workload type, though the margins are surprisingly narrow. The AMD Opteron 6366 HE takes all six recorded head-to-head wins, but none of them exceed a 0.9% delta. This is not a dominant performance gap; it is a consistent but modest advantage across both multi-core and single-core tests.

For multi-threaded rendering tasks, the Opteron leads in every Cinebench generation. In Cinebench R15 multi-core, it scores 480 against the Xeon D-1521's 476, a 0.8% edge. In Cinebench R20 multi-core, the margin widens slightly to 0.9%, with scores of 2003 and 1985 respectively. The R23 multi-core test shows the same 0.9% delta, 4771 versus 4728. These results indicate that despite having four times the core count, the Opteron only manages a sub-1% improvement in heavily threaded workloads.

Single-core performance is essentially a tie. The R15 single-core test records identical scores of 67 for both processors. The R20 single-core test gives the Opteron a 0.7% edge, 282 versus 280, and the R23 single-core test shows a 0.9% advantage, 673 versus 667. For tasks that rely on a single thread, users should expect near-identical behavior from either chip.

The average benchmark score tells a similar story. The Opteron averages 1379, while the Xeon averages 1367, a difference of less than 1%. Both processors sit at the 36th percentile among all CPUs in the database. In practical terms, the Opteron wins every recorded test, but the Xeon's losses are so small that they could easily be lost in run-to-run variance.

Architecture Differences

The two processors come from different eras and design philosophies. The AMD Opteron 6366 HE is built on the Piledriver architecture, codenamed Abu Dhabi, using a 32 nm process from GlobalFoundries. The Intel Xeon D-1521 uses the Broadwell architecture, codenamed Broadwell-DE, on a 14 nm process from Intel. The manufacturing node difference is significant: 32 nm versus 14 nm, which explains much of the power and efficiency gap.

Core counts differ dramatically. The Opteron packs 16 cores with 16 threads, while the Xeon offers 4 cores with 8 threads thanks to Hyper-Threading. The Opteron's transistor count is listed at 2,400 million spread across a dual-die design with each die measuring 315 mm². The Xeon integrates 3,200 million transistors on a single 246 mm² die. Despite having more transistors in a smaller footprint, the Xeon delivers far lower power consumption at 45 TDP versus the Opteron's 85 TDP.

Cache hierarchies are structured differently as well. The Opteron provides 768 KB of L1 cache, 2 MB per module for L2 cache, and 8 MB per die for L3 cache. The Xeon allocates 64 KB of L1 per core, 256 KB of L2 per core, and 1.5 MB of L3 per core. Both support ECC memory, which is essential for server workloads.

Memory and I/O features differ substantially. The Opteron uses DDR3 memory with a quad-channel bus and a recorded memory bandwidth of 59.7 GB/s. The Xeon supports both DDR3 and DDR4, but only through a dual-channel bus, and no bandwidth figure is recorded in the database. The Xeon offers PCIe Gen 3 with 24 lanes, while the Opteron is limited to PCIe Gen 2. The Xeon uses a BGA 1667 socket, whereas the Opteron uses the older G34 socket.

Release timing also differs by roughly three years. The Opteron launched in early November 2012, while the Xeon arrived in early November 2.5 years later. The Opteron is marked as end-of-life, while the Xeon remains listed as active production status.

The Verdict

The data points to a clear if not overwhelming conclusion: the AMD Opteron 6366 HE wins every recorded benchmark, but only by margins of 0.9% or less. Users choosing between these two should base their decision on platform needs and ecosystem requirements rather than raw performance, since the measured scores are nearly indistinguishable.

The Opteron makes sense for workloads that can use its 16 cores and 16 threads, even if the actual performance advantage in Cinebench is small. Its quad-channel DDR3 memory bus with 59.7 GB/s of bandwidth provides a memory throughput advantage that could matter in memory-bound server applications, though no direct memory benchmark is recorded in this database. The higher TDP of 85 watts reflects its older 32 nm process, and its G34 socket platform is end-of-life.

The Xeon D-1521, while losing all six head-to-head tests, offers a far more modern platform. Its 14 nm process and 45 TDP make it substantially more power-efficient on paper. It supports both DDR3 and DDR4 memory, provides PCIe Gen 3 with 24 lanes, and remains in active production status. For new server deployments where power efficiency, modern I/O, and an active platform matter more than a 0.9% Cinebench margin, the Xeon is the defensible choice.

The percentile ranking of 36 for both processors confirms that neither is a high-performance part by modern standards. They sit in the same performance class, separated by less than 1% in average score. The Opteron is the correct pick for legacy G34 platforms with many cores already in place, while the Xeon suits newer builds prioritizing efficiency and connectivity.

FAQ

Q: Which processor has more cores?

A: The AMD Opteron 6366 HE has 16 cores and 16 threads, while the Intel Xeon D-1521 has 4 cores and 8 threads.

Q: How much faster is the Opteron in multi-core Cinebench R23?

A: The Opteron scores 4771 versus the Xeon's 4728, a 0.9% advantage.

Q: Do the two processors have identical single-core performance?

A: In Cinebench R15 single-core, both score exactly 67. In R20 and R23, the Opteron leads by 0.7% and 0.9% respectively.

Q: Which chip supports DDR4 memory?

A: Only the Intel Xeon D-1521 supports DDR4. The AMD Opteron 6366 HE supports DDR3 exclusively.

Q: What are the power consumption figures?

A: The Opteron is rated at 85 TDP, while the Xeon is rated at 45 TDP.

Q: Are both processors still in production?

A: No. The Opteron is marked as end-of-life, while the Xeon has an active production status.

Head-to-Head Benchmarks

The six recorded Cinebench tests form a complete picture of relative performance. Starting with Cinebench R15 multi-core, the Opteron scores 480 against the Xeon's 476, a 0.8% win. The single-core R15 test produces a dead heat at 67 points for both chips, a 0% delta. This is the only recorded tie, and it shows that the Opteron's higher boost clock of 3.10 GHz versus the Xeon's 2.70 GHz does not translate into a meaningful single-thread advantage in this older test.

Moving to Cinebench R20, the patterns hold. The multi-core test gives the Opteron a 2003 score versus 1985, a 0.9% margin. The single-core test shows 282 versus 280, a 0.7% edge. The Opteron's lead in both tests, while small, is consistent across generations of the Cinebench suite.

Cinebench R23 repeats the same structure. Multi-core results are 4771 for the Opteron and 4728 for the Xeon, another 0.9% delta. Single-core results are 673 versus 667, again a 0.9% delta. Every generation of Cinebench in this database records the same outcome: the Opteron wins all multi-core and all single-core tests, with margins ranging from 0% to 0.9%.

The largest win, in percentage terms, appears in Cinebench R20 multi-core at 0.9%, shared with the R23 multi-core and R23 single-core tests. The smallest wins are the 0.8% R15 multi-core and the 0% R15 single-core. Across all six tests, the Opteron's average score of 1379 beats the Xeon's 1367 by 12 points, less than a 1% gap. The nearest rival data places both chips near the same cluster: the Opteron matches the AMD Ryzen 3 PRO 2300U and Ryzen 3 PRO 1200 at 1379, while the Xeon sits just below the Intel Core i7-3820QM at 1366.

Specification Differences

The two processors differ on nearly every major specification line. Core count stands out first: 16 cores for the Opteron versus 4 cores for the Xeon. Threads follow the same pattern, 16 versus 8. Base clocks are 1800 MHz for the Opteron and 2400 MHz for the Xeon, while boost clocks are 3.10 GHz versus 2.70 GHz. The Xeon runs at a higher base frequency, but the Opteron boosts higher.

Power ratings differ by nearly half: the Opteron draws 85 TDP, the Xeon only 45 TDP. The socket types are incompatible, with the Opteron using AMD Socket G34 and the Xeon using Intel BGA 1667. Architecture and process node mark a generational gap: Piledriver on 32 nm versus Broadwell on 14 nm. The foundries differ as well, GlobalFoundries for AMD and Intel for its own chip.

Transistor counts and die sizes reflect different design approaches. The Opteron uses 2,400 million transistors across a dual-die package with each die at 315 mm². The Xeon packs 3,200 million transistors into a single 246 mm² die. Cache organization is not directly comparable because of per-module and per-core definitions, but the Opteron offers 768 KB L1, 2 MB L2 per module, and 8 MB L3 per die, while the Xeon provides 64 KB L1 per core, 256 KB L2 per core, and 1.5 MB L3 per core.

Memory support separates the two clearly. The Opteron is limited to DDR3 with a quad-channel bus and a recorded bandwidth of 59.7 GB/s. The Xeon supports DDR3 and DDR4 with a dual-channel bus and no recorded bandwidth figure. Both support ECC memory. PCIe generations differ, with the Opteron on Gen 2 and the Xeon on Gen 3 with 24 lanes. Release dates are roughly three years apart, and the Opteron is listed as end-of-life while the Xeon remains active.