CPU Comparison

The AMD Opteron 4226 and Intel Xeon W3565 are two end-of-life server/workstation processors that, despite very different internal designs and release timelines, land in nearly the same performance tier. The data shows a remarkable statistical tie: the Opteron 4226 holds an average benchmark score of 995, while the Xeon W3565 sits at 993, a difference of just 0.2%. Both processors occupy the 27th percentile among all CPUs, meaning they deliver similar real-world results in legacy applications. The head-to-head benchmark suite confirms this, with the AMD chip winning all five tests by margins ranging from 0.1% to 0.6%, margins that are effectively negligible in daily use, but the pattern of wins is consistent.

FAQ

Q: Which processor has more cores?

A: The AMD Opteron 4226 has 6 cores and 6 threads, while the Intel Xeon W3565 has 4 cores and 8 threads. The AMD chip has two more physical cores, but the Intel chip offers two additional threads via Hyper-Threading, which helps it stay competitive in multi-threaded workloads.

Q: How do their clock speeds compare?

A: The Intel Xeon W3565 has a base clock of 3.20 GHz and a boost clock of 3.47 GHz. The AMD Opteron 4226 has a lower base clock of 2.70 GHz and a boost clock of 3.10 GHz. The Intel chip has a clock advantage of 0.50 GHz at base and 0.37 GHz at boost, which offsets the AMD chip's core-count advantage.

Q: What is the performance difference in Cinebench R23 multicore?

A: The AMD Opteron 4226 scores 2890 in Cinebench R23 multicore, while the Intel Xeon W3565 scores 2888. The AMD chip wins by 0.1%, which is a difference of just 2 points, effectively a tie in this workload.

Q: Do both processors support ECC memory?

A: Yes, both the AMD Opteron 4226 and the Intel Xeon W3565 support ECC memory. This makes both suitable for server and workstation environments where data integrity is critical.

Q: Which processor has a smaller manufacturing process?

A: The AMD Opteron 4226 is built on a 32 nm process by GlobalFoundries, while the Intel Xeon W3565 uses a 45 nm process from Intel. The smaller 32 nm node gives the AMD chip a manufacturing advantage, allowing it to pack 1,200 million transistors into a 315 mm² die versus 731 million transistors on a 263 mm² die for Intel.

Q: What are the memory channel configurations?

A: The AMD Opteron 4226 uses a dual-channel memory bus, while the Intel Xeon W3565 uses a triple-channel configuration. The AMD chip has a listed memory bandwidth of 25.6 GB/s, whereas the Intel chip's memory bandwidth is not specified in the data.

Architecture Differences

The architectural split between these two processors is stark. The AMD Opteron 4226 is based on the Bulldozer architecture, codenamed Valencia, and belongs to the Opteron 4000 series. It is manufactured on a 32 nm process by GlobalFoundries, with 1,200 million transistors on a 315 mm² die. The chip features 6 cores and 6 threads, meaning each core handles a single thread without simultaneous multithreading. Its cache layout includes 288 KB of L1 cache, 6 MB of L2 cache, and 8 MB of shared L3 cache. The design targets power efficiency with a 95W TDP and uses AMD Socket C32.

The Intel Xeon W3565, in contrast, is built on the Nehalem architecture, codenamed Bloomfield. It uses a 45 nm process from Intel with 731 million transistors on a 263 mm² die. The chip has 4 cores and 8 threads, leveraging Hyper-Threading to double the thread count. Its cache structure is per-core: 64 KB of L1 and 256 KB of L2 per core, plus 8 MB of shared L3 cache. The Intel chip has a higher 130W TDP and uses Intel Socket 1366. The process node difference (32 nm vs 45 nm) explains why the AMD chip packs nearly twice the transistor count despite a similar die size, though the Intel design relies on higher clock speeds to extract performance.

Both processors support DDR3 memory and ECC, and both use PCIe Gen 2. Neither has integrated graphics. The AMD chip was released in November 2011, while the Intel chip came out in October 2009, making the Xeon roughly two years older in design philosophy.

Head-to-Head Benchmarks

The benchmark results across the Cinebench suite show an incredibly tight race, with the AMD Opteron 4226 taking all five tests. The largest margin is in Cinebench R20 single-core, where the AMD chip scores 171 versus the Intel's 170, a 0.6% advantage. This is notable because single-core performance typically favors Intel's higher clock speeds, but the AMD chip's boost clock of 3.10 GHz manages to edge out the Intel's 3.47 GHz boost in this specific test.

In Cinebench R15 multicore, the AMD Opteron 4226 scores 291 against the Intel Xeon W3565's 290, a 0.3% lead. The Cinebench R20 multicore test shows a similar pattern: 1213 for AMD versus 1212 for Intel, a 0.1% difference. Cinebench R23 multicore is equally close at 2890 versus 2888, again a 0.1% margin. Finally, Cinebench R23 single-core has the AMD chip winning 408 to 407, a 0.2% lead.

The pattern is clear: the AMD Opteron 4226 wins all five head-to-head tests, but the maximum delta is just 0.6%. These margins are within run-to-run variance for most benchmarking tools, so the practical takeaway is that these processors are functionally equivalent in Cinebench workloads. The AMD chip's two extra cores compensate for the Intel chip's higher clocks and extra threads, resulting in a dead heat.

Specification Differences

| Specification | AMD Opteron 4226 | Intel Xeon W3565 |

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

| Cores | 6 | 4 |

| Threads | 6 | 8 |

| Base Clock | 2.70 GHz | 3.20 GHz |

| Boost Clock | 3.10 GHz | 3.47 GHz |

| TDP | 95W | 130W |

| Socket | AMD Socket C32 | Intel Socket 1366 |

| Architecture | Bulldozer | Nehalem |

| Process Node | 32 nm | 45 nm |

| Transistors | 1,200 million | 731 million |

| Die Size | 315 mm² | 263 mm² |

| L1 Cache | 288 KB | 64 KB (per core) |

| L2 Cache | 6 MB | 256 KB (per core) |

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

| Memory Bus | Dual-channel | Triple-channel |

| Memory Bandwidth | 25.6 GB/s | Not specified |

| Release Date | 2011-11-13 | 2009-10-31 |

| Launch MSRP | $125 | Not listed |

The specification sheet reveals a fundamental trade-off. The AMD chip offers more cores, a smaller process node, lower TDP, and a lower launch MSRP of $125. The Intel chip counters with higher base and boost clocks, more threads, and a triple-channel memory bus. The Intel chip has a higher TDP of 130W versus 95W, reflecting its older 45 nm process and higher clock speeds.

The Verdict

The benchmark data indicates that these two processors are performance equals in the tested workloads, despite their architectural differences. The AMD Opteron 4226 wins all five head-to-head Cinebench tests, but the largest margin is 0.6%, which is well within the noise of most real-world applications. The average benchmark scores of 995 and 993, respectively, place both in the 27th percentile of all CPUs, confirming that neither has a meaningful performance advantage.

The choice between them comes down to platform considerations rather than raw speed. The AMD Opteron 4226 offers a lower 95W TDP, making it easier to cool in dense server chassis, and it supports dual-channel memory with a specified 25.6 GB/s bandwidth. It also has a lower launch MSRP of $125. The Intel Xeon W3565, with its 130W TDP and triple-channel memory, may appeal to systems already built around Socket 1366, but the data does not show a performance benefit to justify the higher power draw.

For a builder choosing between these two legacy parts, the AMD Opteron 4226 is the data-backed pick: it wins every benchmark, consumes less power, and carries a lower launch price. The Intel Xeon W3565 is a viable alternative if the platform or memory configuration (triple-channel) is already in place, but the benchmarks show no scenario where it comes out ahead.

Where Each One Wins

AMD Opteron 4226 wins on: all five Cinebench tests (R15 multicore, R20 multicore, R20 single-core, R23 multicore, R23 single-core), power efficiency with a 95W TDP versus 130W, and manufacturing efficiency with a 32 nm process versus 45 nm. It also offers two additional physical cores, which can help in workloads that scale with core count rather than thread count.

Intel Xeon W3565 wins on: clock speed, with a 3.20 GHz base and 3.47 GHz boost versus 2.70 GHz and 3.10 GHz for the AMD chip. It also has more threads (8 versus 6) thanks to Hyper-Threading, and it uses a triple-channel memory bus, which can provide higher memory throughput in memory-sensitive applications, though the AMD chip's 25.6 GB/s bandwidth is the only figure listed.

In practice, the AMD Opteron 4226 is the safer choice for a wide range of server workloads, given its benchmark sweep and lower power envelope. The Intel Xeon W3565 is best reserved for systems where the Socket 1366 platform and triple-channel memory are already present, or where higher clocks are preferred for lightly threaded legacy software. The performance deltas are too small to matter, so platform fit and power budget should dictate the decision.