AMD Opteron 6281 vs Intel Xeon E3-1241 v3 Comparison

The AMD Opteron 6281 and Intel Xeon E3-1241 v3 are both end-of-life server processors, but they represent fundamentally different design philosophies. The Opteron 6281 is a 16-core, 16-thread Bulldozer-based part from AMD’s Opteron 6000 series, while the Xeon E3-1241 v3 is a 4-core, 8-thread Haswell-based part from Intel. Benchmark results from the database show a remarkably tight contest: the Opteron 6281 wins all six recorded Cinebench tests, but the margins are consistently narrow, ranging from 1.2% to 1.9%. The average benchmark score for the Opteron is 1789, against 1756 for the Xeon, placing the AMD part in the 42nd percentile of all CPUs and the Intel part in the 41st percentile. This is not a case of one chip dominating; it is a case of two very different architectures converging on similar real-world performance, with the AMD chip’s core-count advantage almost exactly offset by the Intel chip’s superior per-core efficiency.

Where Each One Wins

The data is unambiguous on the head-to-head benchmarks: the AMD Opteron 6281 wins every single recorded test. Across Cinebench R15, R20, and R23, in both single-core and multi-core runs, the Opteron consistently edges out the Xeon. The largest margin is 1.9%, seen in Cinebench R20 multi-core, R20 single-core, and R23 multi-core and single-core. The smallest margin is 1.2% in Cinebench R15 single-core. This means that for any workload captured by these render benchmarks, the Opteron 6281 holds a slight but repeatable lead.

That said, the practical use-case split is less about raw wins and more about workload character. The Opteron 6281’s 16 cores and 16 threads give it a structural advantage in heavily parallel, multi-threaded server tasks, even if that advantage is smaller than the core count suggests. The Xeon E3-1241 v3, with 4 cores and 8 threads, is a lower-core-count part that compensates with a higher base clock of 3.50 GHz and boost clock of 3.90 GHz, compared to the Opteron’s 2.50 GHz base and 3.20 GHz boost. In single-threaded workloads, the Xeon’s clock speed and newer architecture should theoretically help, but the recorded single-core Cinebench scores show the Opteron still wins, albeit by 1.2% to 1.9%. So the database does not support a scenario where the Xeon wins any head-to-head benchmark. Instead, the Xeon’s role is as a lower-power, lower-core alternative that nearly matches the Opteron in the same tests.

For a server operator choosing between these two, the Opteron 6281 is the choice if the workload is already tuned for many threads and the slight multi-core edge matters. The Xeon E3-1241 v3 is the choice if power consumption, measured here by TDP, is the priority: it draws 80 watts versus the Opteron’s 130 watts, a 50-watt difference that appears in the specification differences. The benchmark data shows no scenario where the Xeon outperforms the Opteron, so any decision in favor of the Xeon must be based on non-benchmark factors like thermal envelope, socket compatibility, or platform features.

Architecture Differences

The two processors come from different eras and different design philosophies. The AMD Opteron 6281 uses the Bulldozer architecture, codenamed Interlagos, built on a 32 nm process at GlobalFoundries. It integrates 2,400 million transistors across a die size of 2x 315 mm². The Intel Xeon E3-1241 v3 uses the Haswell architecture, codenamed Haswell-WS, built on a 22 nm process at Intel, with 1,400 million transistors on a single 160 mm² die. The process node difference is significant: 32 nm versus 22 nm, giving Intel a density and efficiency edge that helps explain how a 4-core part can nearly match a 16-core part.

Cache organization is a major architectural split. The Opteron 6281 has 768 KB of L1 cache, 2 MB of L2 cache per module, and 8 MB of L3 cache per die. The Xeon E3-1241 v3 has 64 KB of L1 cache per core, 256 KB of L2 cache per core, and 8 MB of shared L3 cache. The Opteron’s cache is organized around its module-based Bulldozer design, where pairs of cores share resources, while the Xeon’s cache is per-core with a shared L3 pool. The total L3 cache is the same (8 MB), but the distribution and access patterns differ.

Memory support also diverges. Both support DDR3 memory, but the Opteron 6281 uses a quad-channel memory bus with a theoretical bandwidth of 51.2 GB/s, while the Xeon E3-1241 v3 uses a dual-channel bus with 25.6 GB/s bandwidth. This gives the Opteron a 2x advantage in raw memory bandwidth, which is relevant for memory-intensive server workloads. Both support ECC memory, so that is not a differentiator. On the PCIe front, the Opteron uses PCIe Gen 2, while the Xeon uses PCIe Gen 3 with 16 CPU-only lanes. The newer PCIe standard on the Xeon offers higher per-lane bandwidth, but the Opteron’s platform likely provides more total lanes across its socket.

The Opteron 6281 uses AMD Socket G34, while the Xeon E3-1241 v3 uses Intel Socket 1150. This means they are not interchangeable in any system. The Opteron is part of the Opteron 6000 series, a multi-die server platform, while the Xeon is a single-socket workstation/server part. Both are marked as end-of-life, but the Opteron’s release date is recorded as April 2012, while the Xeon’s is May 2014, a difference of over two years. The Opteron’s launch MSRP is listed as $988, while the Xeon’s is $273, but that price difference is not a focus of this analysis.

Head-to-Head Benchmarks

The database records six direct comparisons between these two CPUs, all from the Cinebench suite. In Cinebench R15 multi-core, the Opteron 6281 scores 623 against the Xeon’s 612, a 1.8% lead. In R15 single-core, the Opteron scores 87 against 86, a 1.2% lead. In R20 multi-core, the Opteron scores 2598 against 2550, a 1.9% lead. In R20 single-core, the Opteron scores 366 against 359, again 1.9%. In R23 multi-core, the Opteron scores 6187 against 6072, a 1.9% lead. In R23 single-core, the Opteron scores 873 against 857, also 1.9%. The pattern is consistent: the Opteron wins every test, and the margin is always between 1.2% and 1.9%.

These margins are small enough that they fall within normal run-to-run variance for many systems, but the fact that the Opteron wins all six tests suggests a genuine, if modest, performance edge. The single-core results are particularly telling. The Xeon has a base clock of 3.50 GHz and a boost of 3.90 GHz, while the Opteron has a base of 2.50 GHz and a boost of 3.20 GHz. Despite a 1.0 GHz lower base clock and a 0.7 GHz lower boost clock, the Opteron still manages to beat the Xeon in single-core Cinebench tests by 1.2% to 1.9%. This indicates that the Bulldozer architecture, despite its reputation for weak single-thread performance, is not necessarily inferior in this specific benchmark, or that the Cinebench workload does not favor the Xeon as much as other single-thread tests might.

The multi-core results are more intuitive. The Opteron has 16 cores versus the Xeon’s 4 cores, a 4x difference in core count, yet it only leads by about 1.9% in multi-core tests. This reveals how inefficient the Bulldozer modules are at scaling. Each module in the Opteron shares resources, and the 16 cores do not deliver anywhere near 4x the performance of the Xeon’s 4 cores. The Xeon’s Haswell cores are far more efficient per-core, and its higher clock speeds make up for the core-count deficit. The average benchmark score of 1789 for the Opteron versus 1756 for the Xeon is a 1.9% difference, matching the head-to-head deltas.

Specification Differences

The key specification differences are as follows. The Opteron 6281 has 16 cores and 16 threads, while the Xeon E3-1241 v3 has 4 cores and 8 threads. The Opteron’s base clock is 2.50 GHz and boost clock is 3.20 GHz; the Xeon’s base clock is 3.50 GHz and boost clock is 3.90 GHz. The Opteron has a TDP of 130 watts; the Xeon has a TDP of 80 watts. The Opteron uses AMD Socket G34; the Xeon uses Intel Socket 1150. The Opteron is built on a 32 nm process at GlobalFoundries with 2,400 million transistors and a die size of 2x 315 mm²; the Xeon is built on a 22 nm process at Intel with 1,400 million transistors and a die size of 160 mm². The Opteron has 768 KB of L1 cache, 2 MB of L2 per module, and 8 MB of L3 per die; the Xeon has 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. The Opteron supports quad-channel DDR3 with 51.2 GB/s bandwidth; the Xeon supports dual-channel DDR3 with 25.6 GB/s bandwidth. The Opteron uses PCIe Gen 2; the Xeon uses PCIe Gen 3 with 16 CPU-only lanes. The Opteron’s release date is recorded as April 2012, while the Xeon’s is May 2014. The Opteron’s launch MSRP is $988, and the Xeon’s is $273. Both lack integrated graphics and both support ECC memory.

FAQ

Q: Which CPU has more cores?

A: The AMD Opteron 6281 has 16 cores and 16 threads, while the Intel Xeon E3-1241 v3 has 4 cores and 8 threads.

Q: What are the clock speeds?

A: The Opteron 6281 has a base clock of 2.50 GHz and a boost clock of 3.20 GHz. The Xeon E3-1241 v3 has a base clock of 3.50 GHz and a boost clock of 3.90 GHz.

Q: Which CPU has higher memory bandwidth?

A: The Opteron 6281 supports quad-channel DDR3 with a theoretical bandwidth of 51.2 GB/s. The Xeon E3-1241 v3 supports dual-channel DDR3 with 25.6 GB/s.

Q: How do they compare in Cinebench R23 multi-core?

A: The Opteron 6281 scores 6187, and the Xeon E3-1241 v3 scores 6072, giving the Opteron a 1.9% lead.

Q: Which CPU has lower TDP?

A: The Xeon E3-1241 v3 has a TDP of 80 watts, while the Opteron 6281 has a TDP of 130 watts.

Q: Do both support ECC memory?

A: Yes, both the Opteron 6281 and the Xeon E3-1241 v3 support ECC memory.

The Verdict

Based strictly on the recorded benchmark data, the AMD Opteron 6281 is the faster processor. It wins all six head-to-head Cinebench tests, with margins between 1.2% and 1.9%. Its average benchmark score of 1789 is higher than the Xeon’s 1756, and it sits in the 42nd percentile of all CPUs versus the Xeon’s 41st percentile. The Opteron’s 16 cores and quad-channel memory give it a structural advantage in multi-threaded and memory-bandwidth-sensitive workloads, and the data confirms that this advantage translates into real, if small, performance wins.

However, the Xeon E3-1241 v3 is not a poor performer. It nearly matches the Opteron despite having only 4 cores and 8 threads, thanks to its higher clock speeds (3.50 GHz base, 3.90 GHz boost) and more efficient 22 nm Haswell architecture. Its TDP of 80 watts is significantly lower than the Opteron’s 130 watts, making it a more power-efficient choice for environments where thermal load or energy consumption is a concern. The Xeon also uses a more modern PCIe Gen 3 interface, while the Opteron is limited to PCIe Gen 2.

The choice between these two depends on the platform and the workload. If the system already uses AMD Socket G34 and the workload is highly parallel, the Opteron 6281 is the better pick based on its consistent benchmark lead. If the system is on Intel Socket 1150 and power efficiency is a priority, the Xeon E3-1241 v3 is a reasonable alternative, but the database shows that the Opteron will still outperform it in every recorded Cinebench test. There is no benchmark data to support choosing the Xeon on performance grounds. The Opteron 6281 is the winner in every recorded measurement, and that is the verdict the data supports.