AMD Opteron 6274 vs AMD Opteron 6366 HE Comparison
AMD Opteron 6274
Opteron 6366 HE
PERFORMANCE BENCHMARKS
Analysis: AMD Opteron 6274 vs AMD Opteron 6366 HE
The AMD Opteron 6274 and AMD Opteron 6366 HE are two 16-core server processors from the Opteron 6000 series, both built for the AMD Socket G34 platform. Benchmark data shows the 6274 winning all six head-to-head Cinebench tests, yet the margin is remarkably slim—never exceeding 1.5%. The 6366 HE, however, counters with a significantly lower thermal design power (85 watts versus 115 watts) and higher memory bandwidth (59.7 GB/s versus 51.2 GB/s). This is not a story of generational dominance, but of a tight performance parity achieved through different engineering priorities.
The Verdict
The data presents a clear but narrow choice. The AMD Opteron 6274 is the outright performance winner in every recorded benchmark, taking all six head-to-head tests. Its lead over the 6366 HE ranges from 0.5% in Cinebench R20 and R23 multi-core tests to 1.5% in the Cinebench R15 single-core test. The average benchmark score reinforces this: the 6274 posts 1387 versus the 6366 HE’s 1379, a 0.6% gap. For workloads where every point in Cinebench matters, the 6274 is the data-backed selection.
The AMD Opteron 6366 HE, however, is the efficiency pick. Its 85-watt TDP is 26% lower than the 6274’s 115-watt TDP, a substantial reduction for dense server deployments where thermal and power budgets are tight. This efficiency comes at a minimal performance cost—the 6366 HE trails by less than 1% in most multi-core tests. For a server operator running hundreds of sockets, the 6366 HE’s thermal advantage likely outweighs a fractional performance deficit. The choice hinges on whether the priority is maximum throughput per socket (6274) or minimum power draw per core (6366 HE).
Architecture Differences
Both processors share the same 32 nm process node from GlobalFoundries, with 2,400 million transistors on two 315 mm² dies. The fundamental split is in microarchitecture. The Opteron 6274 uses Bulldozer (codename Interlagos), released in 2011, while the Opteron 6366 HE uses the newer Piledriver (codename Abu Dhabi), released in 2012. Piledriver is an evolved Bulldozer design, though the benchmark data shows the architectural refresh did not translate into higher Cinebench scores—the older chip still edges ahead.
Core configurations are identical on paper: 16 cores and 16 threads each. Cache hierarchies also match: 768 KB of L1, 2 MB of L2 per module, and 8 MB of L3 per die. The key divergence is clock speed. The 6274 runs a 2.20 GHz base clock, while the 6366 HE drops to 1.80 GHz. Both boost to 3.10 GHz. This 0.40 GHz base-clock deficit explains most of the 6366 HE’s slight performance lag in multi-threaded tests, even with Piledriver’s IPC improvements.
Memory subsystems differ notably. Both support DDR3 over a quad-channel bus with ECC, but the 6366 HE achieves 59.7 GB/s of memory bandwidth versus the 6274’s 51.2 GB/s—a 16.6% increase. This is a real architectural advantage for the newer chip, even if it does not appear in Cinebench scores. Both use PCIe Gen 2 and lack integrated graphics. Neither processor has an unlocked multiplier, and both are end-of-life products. The 6274 launched with an MSRP of $639, while the 6366 HE launched at $575.
Where Each One Wins
The Opteron 6274 wins on raw compute in every recorded test. In Cinebench R15 multi-core, it scores 483 against 480; in R20 multi-core, 2014 against 2003; in R23 multi-core, 4796 against 4771. Single-core results follow the same pattern: 68 vs 67 in R15, 284 vs 282 in R20, and 677 vs 673 in R23. The 6274’s higher base clock gives it a consistent edge in both lightly-threaded and fully-threaded workloads. Its 37th percentile ranking among all CPUs also edges out the 6366 HE’s 36th percentile.
The Opteron 6366 HE wins on operational efficiency. Its 85-watt TDP is the headline feature, enabling higher core density per rack and lower cooling requirements. Its memory bandwidth advantage—59.7 GB/s versus 51.2 GB/s—makes it the better choice for memory-bandwidth-bound applications, even though Cinebench does not capture this. The 6366 HE’s nearest rivals include AMD Ryzen 3 PRO chips with identical average scores (1379), indicating it competes well beyond its server lineage. For workloads that are not compute-saturated but are memory-sensitive, the 6366 HE is the more balanced part.
FAQ
Q: Which processor is faster in multi-core workloads?
A: The AMD Opteron 6274 wins all three multi-core Cinebench tests: 483 vs 480 in R15, 2014 vs 2003 in R20, and 4796 vs 4771 in R23. The largest margin is 0.6%.
Q: How much more efficient is the Opteron 6366 HE?
A: The 6366 HE has a TDP of 85 watts, compared to the 6274’s 115 watts. This represents a 26% reduction in thermal design power.
Q: Do the processors support ECC memory?
A: Yes, both the Opteron 6274 and the Opteron 6366 HE support ECC memory. Both use quad-channel DDR3.
Q: What is the memory bandwidth difference?
A: The Opteron 6366 HE provides 59.7 GB/s of memory bandwidth, while the Opteron 6274 provides 51.2 GB/s. The 6366 HE has a 16.6% higher memory bandwidth.
Q: Are these processors unlocked for overclocking?
A: No, neither the Opteron 6274 nor the Opteron 6366 HE has an unlocked multiplier.
Q: Which chip has a higher base clock?
A: The Opteron 6274 has a base clock of 2.20 GHz, while the Opteron 6366 HE has a base clock of 1.80 GHz. Both have a boost clock of 3.10 GHz.
Head-to-Head Benchmarks
The benchmark sweep is a clean victory for the Opteron 6274, but the margins tell a nuanced story. In Cinebench R15 multi-core, the 6274 scores 483 against the 6366 HE’s 480, a 0.6% delta. This is the largest multi-core gap in the entire comparison. The single-core R15 test shows the biggest overall delta: 68 vs 67, a 1.5% lead for the 6274. That is the only test where the older chip’s advantage exceeds 1%.
Moving to Cinebench R20, the pattern holds but tightens. The multi-core result is 2014 vs 2003, a 0.5% delta. Single-core is 284 vs 282, a 0.7% delta. These scores are nearly identical in practical terms—a 1.5% difference in R15 single-core is within run-to-run variance for many workloads. The 6274’s base-clock advantage (2.20 GHz vs 1.80 GHz) does not translate into a proportionally larger performance lead, suggesting Piledriver’s architectural improvements in the 6366 HE close much of the gap.
The final pair, Cinebench R23, repeats the multi-core trend: 4796 vs 4771, a 0.5% delta. Single-core is 677 vs 673, a 0.6% delta. Across all six tests, the 6274’s average win is approximately 0.7%. The 6366 HE’s 85-watt TDP, combined with a 16.6% memory bandwidth advantage, means the performance-per-watt calculus heavily favors the newer chip. The data shows a processor that is effectively tied on compute but dramatically easier to cool and feed with data. For a benchmark database, the 6274 wins the scoreboard; for a system architect, the 6366 HE may win the deployment.