AMD Opteron 6281 vs Intel Core i7-4790T Comparison

# AMD Opteron 6281 vs Intel Core i7-4790T: A 16-Core Server Chip vs a Low-Power Desktop Processor

The AMD Opteron 6281 and Intel Core i7-4790T represent two entirely different philosophies in processor design, separated by two years of release dates and aimed at different market segments. The Opteron 6281, a 16-core server/workstation part from the Opteron 6000 series, faces off against the 4-core, 8-thread desktop-focused Core i7-4790T. The benchmark data shows the Opteron winning all six recorded Cinebench comparisons, but the margins are surprisingly modest given the 12-core difference. The Opteron holds a 42nd percentile ranking among all CPUs, while the i7-4790T sits at the 41st percentile, making them near-neighbors in overall performance despite their architectural chasm.

Where Each One Wins

The recorded data presents a clear sweep: the AMD Opteron 6281 wins every head-to-head benchmark listed, taking all six Cinebench tests across R15, R20, and R23 versions, in both single-core and multi-core configurations. The wins are consistent, with delta percentages ranging from 14.5% to 15.2% across all tests. This uniformity suggests the Opteron's advantage is structural rather than workload-specific, stemming from its fundamental design rather than any particular optimization.

However, the Core i7-4790T is not without its own domain of superiority. The Intel part features integrated graphics in the form of Intel HD 4600, which the Opteron completely lacks. For systems requiring a display output without a discrete GPU, the i7-4790T is the only viable option between these two. The i7-4790T also draws significantly less power, with a 45W TDP compared to the Opteron's 130W TDP, making it suitable for compact or thermally constrained environments. The Intel chip also supports PCIe Gen 3 with 16 lanes from the CPU, while the Opteron is limited to PCIe Gen 2, a difference that matters for modern expansion cards and NVMe storage.

Architecture Differences

The architectural divide between these processors is substantial. The AMD Opteron 6281 uses the Bulldozer architecture, codenamed Interlagos, built on a 32nm process at GlobalFoundries. It houses 16 cores and 16 threads, with a base clock of 2.50 GHz and a boost clock of 3.20 GHz. The chip is physically large, with a die size of 2x 315 mm² and 2,400 million transistors. Its cache hierarchy is organized around modules: 768 KB of L1, 2 MB of L2 per module, and 8 MB of L3 per die. Memory support is DDR3 over a quad-channel bus, delivering 51.2 GB/s of bandwidth, and ECC memory is supported. The Opteron targets the server/workstation segment and uses the AMD Socket G34.

The Intel Core i7-4790T is a Haswell-generation part, built on a 22nm process at Intel's own fabs. It provides 4 cores and 8 threads via Hyper-Threading, with a base clock of 2.70 GHz and a boost clock of 3.90 GHz. The die is much smaller at 177 mm², containing 1,400 million transistors. Cache is organized per core: 64 KB of L1, 256 KB of L2 per core, and 8 MB of shared L3. Memory support is DDR3 over a dual-channel bus, delivering 25.6 GB/s, with no ECC support. The chip includes Intel HD 4600 integrated graphics, uses the Intel Socket 1150, and is classified as a desktop part. It also runs PCIe Gen 3 with 16 CPU lanes, a generational step ahead of the Opteron's Gen 2 support.

The transistor counts and die sizes tell a story of different design goals. The Opteron uses nearly double the transistors across a much larger physical area to implement 16 integer cores, while the i7-4790T concentrates its resources into fewer, more sophisticated cores with higher clock speeds. The boost clock difference is notable: the i7-4790T reaches 3.90 GHz versus the Opteron's 3.20 GHz, a 0.70 GHz advantage that helps explain why the core-count disparity does not translate into larger benchmark gaps.

Head-to-Head Benchmarks

The six recorded comparisons all favor the AMD Opteron 6281, with consistent margins around 15%. In Cinebench R15 multi-core, the Opteron scores 623 against the i7-4790T's 541, a 15.2% advantage. The single-core R15 test shows 87 versus 76, a 14.5% lead. Moving to Cinebench R20, the multi-core result is 2598 for the Opteron and 2258 for the Intel part, a 15.1% gap, while single-core shows 366 versus 318, again 15.1%. In Cinebench R23, the multi-core score is 6187 versus 5378, a 15% difference, and single-core is 873 versus 759, also 15%.

The consistency of these margins is striking. Whether the workload uses one core or all available cores, the Opteron maintains roughly the same proportional advantage. This suggests that the Bulldozer architecture's per-core performance, while lower on an absolute clock-for-clock basis, is sufficient to overcome the i7-4790T's higher boost clock in these particular tests. The i7-4790T's 3.90 GHz boost clock is 0.70 GHz higher than the Opteron's 3.20 GHz, yet the Opteron still wins single-core tests by roughly 15%. This indicates that Cinebench's single-core workload does not scale purely with clock speed, or that the Opteron's architecture extracts more instructions per cycle in this specific rendering task.

The average benchmark score across all recorded tests places the Opteron at 1789, with the i7-4790T at 1755, a difference of about 2%. This narrow overall gap is reflected in their percentile rankings, where the Opteron sits at the 42nd percentile and the i7-4790T at the 41st. The nearest rivals for the Opteron include the AMD Ryzen 3 3200GE at 1787 (0.1% difference), the AMD Ryzen 3 PRO 1300 at 1778 (0.6%), and the Intel Xeon E5-4610 v3 at 1777 (0.7%). The i7-4790T's nearest rivals include the Intel Xeon E3-1241 v3 at 1756 (-0.1%), the Intel Core i5-5675C at 1759 (-0.2%), and the AMD Ryzen 3 PRO 3200GE at 1750 (0.3%).

FAQ

Q: Does the AMD Opteron 6281 win every benchmark against the Intel Core i7-4790T?

A: Yes, the recorded data shows the Opteron 6281 winning all six head-to-head Cinebench tests, with margins between 14.5% and 15.2% across R15, R20, and R23 versions in both single-core and multi-core modes.

Q: Why does the Opteron 6281 not have a larger lead given its 16 cores versus 4 cores?

A: The Core i7-4790T compensates with a higher boost clock of 3.90 GHz versus 3.20 GHz, and the Bulldozer architecture's per-core efficiency is lower. The benchmark data shows a consistent 15% advantage rather than a proportional core-count advantage.

Q: Which processor supports ECC memory?

A: The AMD Opteron 6281 supports ECC memory, while the Intel Core i7-4790T does not. This makes the Opteron suitable for error-correcting workloads in server environments.

Q: Does either processor have integrated graphics?

A: Only the Intel Core i7-4790T includes integrated graphics, specifically Intel HD 4600. The AMD Opteron 6281 has no integrated graphics and requires a discrete GPU for display output.

Q: How do their memory bandwidth figures compare?

A: The Opteron 6281 provides 51.2 GB/s via a quad-channel DDR3 interface, while the i7-4790T provides 25.6 GB/s via dual-channel DDR3, giving the Opteron exactly double the memory bandwidth.

Q: What are the nearest rivals for each processor in the database?

A: For the Opteron 6281, the nearest rivals are the AMD Ryzen 3 3200GE (0.1% difference), AMD Ryzen 3 PRO 1300 (0.6%), and Intel Xeon E5-4610 v3 (0.7%). For the i7-4790T, they are the Intel Xeon E3-1241 v3 (-0.1%), Intel Core i5-5675C (-0.2%), and AMD Ryzen 3 PRO 3200GE (0.3%).

The Verdict

The data indicates that the AMD Opteron 6281 is the faster processor in raw Cinebench performance, winning all six recorded comparisons by around 15%. For workloads that mirror these rendering tests, the Opteron is the clear choice. Its 16 cores and 16 threads, combined with quad-channel memory bandwidth of 51.2 GB/s and ECC support, position it for server and workstation tasks where reliability and memory throughput matter. The 130W TDP and lack of integrated graphics are acceptable trade-offs in a chassis designed for high-performance computing.

The Intel Core i7-4790T, while losing every benchmark comparison, offers attributes the Opteron cannot match. Its 45W TDP makes it far more energy-efficient, and the integrated Intel HD 4600 GPU eliminates the need for a separate graphics card in basic desktop systems. The PCIe Gen 3 support with 16 lanes provides modern connectivity that the Opteron's Gen 2 interface lacks. For a compact desktop or a system where power consumption is critical, the i7-4790T is the practical choice, despite its lower benchmark scores.

The overall average benchmark scores are close, 1789 for the Opteron versus 1755 for the i7-4790T, and their percentile rankings differ by only one point. This suggests that in a mixed workload environment, the two processors may perform more similarly than the Cinebench sweep implies. The Opteron's wins are consistent but narrow, and the i7-4790T's higher boost clock and newer PCIe generation could tip certain real-world scenarios in its favor. The selection should hinge on the specific requirements: core count and memory bandwidth for the Opteron, power efficiency and integrated graphics for the i7-4790T.

Specification Differences

| Specification | AMD Opteron 6281 | Intel Core i7-4790T |

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

| Cores | 16 | 4 |

| Threads | 16 | 8 |

| Base Clock | 2.50 GHz | 2.70 GHz |

| Boost Clock | 3.20 GHz | 3.90 GHz |

| TDP | 130 W | 45 W |

| Socket | AMD Socket G34 | Intel Socket 1150 |

| Architecture | Bulldozer | Haswell |

| Codename | Interlagos | Haswell |

| Process Node | 32 nm | 22 nm |

| Foundry | GlobalFoundries | Intel |

| Transistors | 2,400 million | 1,400 million |

| Die Size | 2x 315 mm² | 177 mm² |

| L1 Cache | 768 KB | 64 KB (per core) |

| L2 Cache | 2 MB (per module) | 256 KB (per core) |

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

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

| Memory Bandwidth | 51.2 GB/s | 25.6 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 2 | Gen 3, 16 Lanes (CPU only) |

| Integrated Graphics | None | Intel HD 4600 |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2012-04-30 | 2014-04-30 |