CPU Comparison

The Verdict

Benchmark results give a clear, unambiguous outcome: the Intel Xeon E5-2609 v3 wins every single head-to-head test against the AMD Opteron 3280, taking all five Cinebench comparisons with deltas between 19.1% and 19.5%. The Intel part leads by 19.1% in Cinebench R15 multi-core (386 vs. 324), by 19.3% in R20 multi-core (1611 vs. 1350), by 19.5% in R20 single-core (227 vs. 190), by 19.3% in R23 multi-core (3836 vs. 3215), and by 19.4% in R23 single-core (541 vs. 453).

Who should pick which? For any workload that touches Cinebench-style rendering or single-threaded responsiveness, the Xeon E5-2609 v3 is the superior option, despite having fewer cores (6 vs. 8) and a lower base clock (1900 MHz vs. 2500 MHz). The Opteron 3280, meanwhile, offers a lower TDP (65W vs. 85W) and a higher base clock, but the data shows that architectural efficiency trumps raw core count and clock speed in every measured scenario.

The average benchmark scores are nearly identical, 1109 for the Xeon versus 1106 for the Opteron, and both sit at the 31st percentile of all CPUs. That parity in the aggregate metric is misleading, though, as the head-to-head Cinebench results reveal a consistent and substantial gap in favor of the Xeon. If the choice is between these two, the Xeon E5-2609 v3 is the performance pick; the Opteron’s only practical advantage from the data is its lower power envelope and its compatibility with the older AM3+ socket ecosystem.

Architecture Differences

The two processors come from fundamentally different design eras and philosophies. The Intel Xeon E5-2609 v3 is built on the Haswell-EP architecture using a 22 nm process at Intel’s foundry, packing 2,600 million transistors into a 356 mm² die. The AMD Opteron 3280 uses the K10 architecture (codename Zurich), fabricated on a 32 nm process at GlobalFoundries, with 1,200 million transistors on a 315 mm² die. That transistor count difference, more than double on the Intel side, is a major factor in the Xeon’s performance advantage.

Core and cache configurations differ sharply. The Xeon has 6 cores and 6 threads, with a per-core L1 cache of 64 KB, per-core L2 of 256 KB, and a shared 15 MB L3 cache. The Opteron has 8 cores and 8 threads, with a total L1 cache of 384 KB, an 8 MB L2 cache, and 8 MB of shared L3. Despite having two fewer cores, the Xeon’s larger L3 cache (15 MB vs. 8 MB) and its newer architecture deliver better results in every benchmark.

Memory and I/O also separate the two. The Xeon supports DDR4 memory over a quad-channel bus with 51.2 GB/s of bandwidth; the Opteron uses DDR3 over a dual-channel bus with 29.9 GB/s. The Xeon also supports ECC memory (true), while the Opteron does not. PCIe generations differ as well: the Xeon offers Gen 3 with 40 lanes (CPU only), whereas the Opteron provides Gen 2. The Opteron lists integrated graphics as a chipset feature on certain motherboards, while the Xeon has no integrated graphics at all.

The market segments also diverge: the Xeon is positioned as a Server/Workstation part, while the Opteron 3280 is a Desktop chip. The Xeon uses the Intel Socket 2011-3 platform; the Opteron uses AMD Socket AM3+. Both are end-of-life products, with the Xeon released on September 7, 2014, and the Opteron on March 19, 2012, roughly two and a half years apart. The launch MSRP for the Xeon was $306; for the Opteron it was $229.

FAQ

Q: Which CPU performs better in multi-core Cinebench R23?

A: The Intel Xeon E5-2609 v3 scores 3836, which is 19.3% higher than the AMD Opteron 3280’s 3215. This holds across all multi-core tests: R15 (386 vs. 324, +19.1%) and R20 (1611 vs. 1350, +19.3%).

Q: Does the Opteron’s higher base clock help it win any benchmark?

A: No. Despite a base clock of 2500 MHz (versus 1900 MHz for the Xeon) and a boost clock of 3500 MHz, the Opteron loses every single head-to-head test. The Xeon wins all five comparisons with deltas ranging from 19.1% to 19.5%. Clock speed alone does not translate to a performance win in this matchup.

Q: How do their average benchmark scores compare?

A: The Xeon E5-2609 v3 has an average benchmark score of 1109, and the Opteron 3280 sits at 1106. Both processors are at the 31st percentile of all CPUs. The aggregate scores are nearly tied, but the head-to-head Cinebench results show a decisive Xeon advantage.

Q: What are the power consumption differences?

A: The AMD Opteron 3280 has a TDP of 65W, which is lower than the Intel Xeon E5-2609 v3’s 85W. This makes the Opteron the more power-efficient choice on paper, though it comes with a clear performance penalty in all measured benchmarks.

Q: Which CPU supports ECC memory?

A: Only the Intel Xeon E5-2609 v3 supports ECC memory. The AMD Opteron 3280 does not list ECC support in its specifications. The Xeon also uses DDR4 memory, while the Opteron uses DDR3.

Q: How do their nearest rivals compare in average score?

A: The Xeon’s nearest rival is the Intel Core i5-4570T at 1108, a delta of 0.1%, and the Intel Xeon E5630 at 1110, a delta of -0.1%. The Opteron’s nearest rival is the AMD Athlon X4 845 at 1106, with a 0% delta, and the AMD Opteron 4280 at 1107, a -0.1% delta. Both CPUs sit in a tightly clustered performance band among their peers.

Specification Differences

The table below lists only the fields where the two processors differ, based on the available data.

| Field | Intel Xeon E5-2609 v3 | AMD Opteron 3280 |

|-------|----------------------|------------------|

| Cores | 6 | 8 |

| Threads | 6 | 8 |

| Base Clock | 1900 MHz | 2500 MHz |

| Boost Clock | None listed | 3500 MHz |

| TDP | 85W | 65W |

| Socket | Intel Socket 2011-3 | AMD Socket AM3+ |

| Architecture | Haswell (Haswell-EP) | K10 (Zurich) |

| Process Node | 22 nm | 32 nm |

| Foundry | Intel | GlobalFoundries |

| Transistors | 2,600 million | 1,200 million |

| Die Size | 356 mm² | 315 mm² |

| L1 Cache | 64 KB (per core) | 384 KB (total) |

| L2 Cache | 256 KB (per core) | 8 MB (total) |

| L3 Cache | 15 MB (shared) | 8 MB (shared) |

| Memory Support | DDR4 | DDR3 |

| Memory Bus | Quad-channel | Dual-channel |

| Memory Bandwidth | 51.2 GB/s | 29.9 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 3, 40 Lanes (CPU only) | Gen 2 |

| Integrated Graphics | None | On certain motherboards (chipset feature) |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2014-09-07 | 2012-03-19 |

| Launch MSRP | $306 | $229 |

| Part Number | SR1YC | OS3280OLW8KGU |

Head-to-Head Benchmarks

The Intel Xeon E5-2609 v3 dominates every benchmark in this comparison, winning all five tests with a remarkably consistent delta of approximately 19%. The narrowest margin is in Cinebench R15 multi-core, where the Xeon scores 386 versus the Opteron’s 324, a 19.1% advantage. The widest margin is in Cinebench R20 single-core, where the Xeon scores 227 against the Opteron’s 190, a 19.5% lead.

Single-core performance tells a particularly telling story. The Opteron’s boost clock of 3500 MHz gives it a significant frequency advantage over the Xeon’s fixed 1900 MHz, no boost clock is listed for the Intel part. Yet the Xeon still wins single-core tests by nearly 20%. In Cinebench R23 single-core, the Xeon scores 541 versus the Opteron’s 453, a 19.4% gap. This demonstrates that per-core efficiency, not raw clock speed, is the decisive factor in these workloads. The Haswell architecture’s superior instruction handling and memory subsystem overcome the 1600 MHz base-clock deficit.

Multi-core results follow the same pattern. The Opteron has 8 cores to the Xeon’s 6, yet the Xeon leads by 19.1% in R15 (386 vs. 324), 19.3% in R20 (1611 vs. 1350), and 19.3% in R23 (3836 vs. 3215). The Xeon’s larger shared L3 cache (15 MB vs. 8 MB) and quad-channel DDR4 memory with 51.2 GB/s bandwidth, versus the Opteron’s dual-channel DDR3 at 29.9 GB/s, likely contribute to this consistent margin. The Opteron’s higher core count cannot compensate for the older K10 architecture’s limitations.

The data shows no scenario where the AMD Opteron 3280 wins. The wins column is 5 for the Xeon and 0 for the Opteron. The average benchmark scores are close (1109 vs. 1106), but that aggregate metric obscures the head-to-head reality: in every specific Cinebench test, the Intel part wins by a margin of roughly one-fifth. The Opteron’s only advantages in the specification sheet, lower TDP, higher clock speeds, more cores, do not translate into any benchmark victory. For anyone choosing between these two end-of-life processors based on performance data alone, the Intel Xeon E5-2609 v3 is the clear pick.