AMD Opteron 6281 vs Intel Core i5-8305G Comparison

The Intel Core i5-8305G and the AMD Opteron 6281 occupy opposite ends of the computing spectrum, yet the recorded benchmark data places them in the same performance percentile. The Opteron 6281, a 16-core server processor from 2012 built on GlobalFoundries' 32 nm process, wins every single head-to-head benchmark in the database, while the Intel Core i5-8305G, a 4-core mobile part from 2018 on Intel's 14 nm node, trails by roughly 7% across the board. The result is a curious statistical tie: both processors sit at the 42nd percentile among all CPUs, with average benchmark scores of 1831 for the Intel part and 1789 for the AMD part. The data shows that raw core count does not translate into a decisive advantage in these tests, and the newer mobile chip's higher clock speeds and newer architecture nearly close a gap that the older server chip maintains through sheer core count.

Where Each One Wins

The AMD Opteron 6281 wins in every recorded benchmark, but the margins are narrow and uniform. In Cinebench R15 multicore, the Opteron scores 623 against the Core i5-8305G's 578, a 7.2% advantage. The single-core test tells the same story: 87 versus 81, a 6.9% lead. This pattern repeats in Cinebench R20, where the Opteron posts 2598 multicore and 366 single-core, against 2410 and 340 for the Intel chip, and in Cinebench R23, where the Opteron reaches 6187 multicore and 873 single-core, while the Intel part manages 5739 and 810. The consistency of these margins, all falling between 6.9% and 7.2%, suggests that the Opteron's advantage stems from a fundamental architectural efficiency in these specific workloads rather than any single feature.

The Intel Core i5-8305G does not win a single recorded benchmark, yet it holds its own in the broader database context. Its average benchmark score of 1831 places it just above the Opteron's 1789, and its nearest rivals include the AMD Ryzen 5 4600U at 1832 and the Intel Xeon E5-2608L v3 at 1830. This means that while the Opteron beats the Core i5 in every head-to-head test, the Core i5 sits in a slightly higher overall performance tier when averaged across the full database. The practical takeaway is that the Opteron 6281 is the stronger chip in these Cinebench workloads, but the Core i5-8305G is not far behind, and the database's aggregate metrics place them in the same percentile.

For users focused on multi-threaded rendering, the Opteron's 16 cores provide a measurable, if modest, lead. For users focused on single-threaded responsiveness, the Opteron also wins, which is unexpected given its much older architecture. The Intel part's higher boost clock of 3.80 GHz against the Opteron's 3.20 GHz does not overcome the Opteron's per-module design in these tests. The data does not support a use case where the Core i5-8305G wins outright, but its integrated Radeon RX Vega M GL graphics and mobile market segment suggest it targets a completely different workload profile that the database's CPU-only benchmarks do not capture.

Architecture Differences

The two processors could not be more different in design philosophy. The Intel Core i5-8305G is a Kaby Lake G part built on Intel's 14 nm process, featuring 4 cores and 8 threads with Hyper-Threading. Its cache layout is per-core: 64 KB of L1 per core, 256 KB of L2 per core, and 6 MB of shared L3. It supports DDR4 memory, does not support ECC, and is designed for the mobile market segment with a 65 W TDP. Its socket is Intel BGA 2270, meaning it is soldered to the motherboard, and its production status is listed as Active.

The AMD Opteron 6281 belongs to the Opteron 6000 series, built on GlobalFoundries' 32 nm process with the Bulldozer architecture under the Interlagos codename. It has 16 cores and 16 threads, with no simultaneous multi-threading. Its cache is organized by module: 768 KB of L1 total, 2 MB of L2 per module, and 8 MB of L3 per die. It supports DDR3 memory through a quad-channel memory bus with a recorded bandwidth of 51.2 GB/s, and it supports ECC memory, which aligns with its server and workstation market segment. The chip uses AMD Socket G34 and carries a 130 W TDP. Its production status is End-of-life, and its part number is OS6278WKTGGGU.

The process node difference is stark: 14 nm for Intel versus 32 nm for AMD. That generational gap usually implies a significant efficiency and performance advantage for the newer process, yet the recorded benchmarks show the older, larger chip winning. The Opteron's transistor count is recorded as 2,400 million, spread across a die size of 2x 315 mm², while the Intel part's transistor count and die size are not recorded in the database. The Opteron also supports PCIe Gen 2, while the Intel part's PCIe information is not recorded. The Intel chip includes integrated Radeon RX Vega M GL graphics, a feature entirely absent from the Opteron, which has no integrated graphics.

The memory ecosystems differ as well. The Intel part uses DDR4, the Opteron uses DDR3. The Opteron's quad-channel bus and 51.2 GB/s bandwidth are recorded, while the Intel part's memory bus and bandwidth are not listed. ECC support is exclusive to the Opteron, which is typical for server hardware. The release dates are separated by nearly six years: the Opteron launched on 2012-04-30, the Core i5 on 2018-01-31. The launch MSRP for the Opteron is $988, while the Core i5 has no recorded launch MSRP.

Head-to-Head Benchmarks

The head-to-head results are unambiguous. The AMD Opteron 6281 wins all six recorded comparisons, with deltas ranging from 6.9% to 7.2%. In Cinebench R15 multicore, the Opteron scores 623 against 578, a 7.2% advantage. In Cinebench R15 single-core, the Opteron scores 87 against 81, a 6.9% lead. Moving to Cinebench R20, the Opteron scores 2598 multicore and 366 single-core, against 2410 and 340 for the Intel part, both results showing a 7.2% and 7.1% advantage respectively. Cinebench R23 follows the same pattern: the Opteron scores 6187 multicore and 873 single-core, while the Intel part scores 5739 and 810, with the Opteron ahead by 7.2% in both.

The consistency of these deltas is notable. Every multicore test shows exactly a 7.2% gap, and every single-core test shows either 6.9%, 7.1%, or 7.2%. This uniformity suggests that the performance difference is not workload-dependent but rather a consistent architectural edge. The Opteron's 16 cores, despite running at a lower base clock of 2.50 GHz and boost clock of 3.20 GHz, outperform the Core i5's 4 cores and 8 threads running at 2.80 GHz base and 3.80 GHz boost. In every test, the older AMD chip comes out ahead, and the margins are tight enough that the two parts sit in the same overall percentile.

The database context reinforces this picture. The Core i5-8305G's nearest rivals include the AMD Ryzen 5 4600U with an average score of 1832, the Intel Xeon E5-2608L v3 at 1830, the Intel Xeon D-1537 at 1830, and the Intel Core i7-4790S at 1827. The Opteron 6281's nearest rivals include the AMD Ryzen 3 3200GE at 1787, the AMD Ryzen 3 PRO 1300 at 1778, the Intel Xeon E5-4610 v3 at 1777, and the Intel Xeon E5-1620 v4 at 1802. The Core i5 has the higher average score at 1831 versus 1789, but the head-to-head tests all favor the Opteron. This means that the Core i5's aggregate standing benefits from its performance in other unrecorded benchmarks, while the Opteron's aggregate score is dragged down by its weaker performance in non-Cinebench workloads.

The Verdict

The data supports a clear conclusion: the AMD Opteron 6281 is the faster processor in every recorded Cinebench test, but the Intel Core i5-8305G is the better-rounded part according to the database's aggregate metrics. The Opteron wins all six head-to-head comparisons with margins between 6.9% and 7.2%, yet its average benchmark score of 1789 is lower than the Core i5's 1831. Both parts sit at the 42nd percentile among all CPUs, which means the overall performance class is equivalent.

For users prioritizing Cinebench-style rendering workloads, the Opteron 6281 is the choice. Its 16 cores and 16 threads, combined with its 2.50 GHz base and 3.20 GHz boost clocks, deliver consistently higher scores than the Core i5's 4 cores and 8 threads. The Opteron also supports ECC memory and has a quad-channel DDR3 bus with 51.2 GB/s bandwidth, making it suitable for server and workstation environments where data integrity and memory throughput matter.

For users prioritizing mobility, integrated graphics, and modern architecture, the Core i5-8305G is the choice. It is a mobile part with a 65 W TDP, integrated Radeon RX Vega M GL graphics, and support for DDR4 memory. Its 14 nm process and Kaby Lake architecture are much newer than the Opteron's 32 nm Bulldozer design. The Core i5 also has a higher average benchmark score in the database, despite losing every head-to-head test, which indicates it performs better in workloads not covered by the Cinebench suite.

The Opteron 6281 is end-of-life, while the Core i5-8305G is still active. The Opteron launched with a $988 MSRP, and its part number is OS6278WKTGGGU. Neither processor has an unlocked multiplier. The Opteron uses AMD Socket G34, the Core i5 uses Intel BGA 2270. These are not interchangeable platforms, and the choice between them is dictated by platform requirements rather than raw performance alone.

FAQ

Q: Which processor wins more benchmarks in the database?

A: The AMD Opteron 6281 wins all six recorded head-to-head benchmarks against the Intel Core i5-8305G, covering Cinebench R15, R20, and R23 in both single-core and multicore tests.

Q: How large is the performance gap between the two?

A: The Opteron 6281 leads by 7.2% in Cinebench R15 multicore, R20 multicore, R23 multicore, and R23 single-core, by 7.1% in R20 single-core, and by 6.9% in R15 single-core.

Q: Do the two processors have similar overall performance standings?

A: Yes, both sit at the 42nd percentile among all CPUs. The Core i5-8305G has an average benchmark score of 1831, while the Opteron 6281 has an average score of 1789.

Q: Does the Core i5-8305G have integrated graphics?

A: Yes, it includes Radeon RX Vega M GL integrated graphics. The AMD Opteron 6281 has no integrated graphics.

Q: Which processor supports ECC memory?

A: The AMD Opteron 6281 supports ECC memory and uses quad-channel DDR3 with 51.2 GB/s bandwidth. The Intel Core i5-8305G does not support ECC memory and uses DDR4.

Q: What are the production statuses of the two processors?

A: The Intel Core i5-8305G is listed as Active, while the AMD Opteron 6281 is listed as End-of-life.

Specification Differences

The two processors differ in nearly every recorded specification. The Intel Core i5-8305G has 4 cores and 8 threads, while the AMD Opteron 6281 has 16 cores and 16 threads. The Intel part has a base clock of 2.80 GHz and a boost clock of 3.80 GHz, while the Opteron runs at 2.50 GHz base and 3.20 GHz boost. The TDP differs substantially: 65 W for the Intel part versus 130 W for the Opteron. The Intel part uses Intel BGA 2270, the Opteron uses AMD Socket G34.

The architectures are entirely different. The Intel part is Kaby Lake G built on Intel's 14 nm process by Intel, while the Opteron is Bulldozer under the Interlagos codename, built on GlobalFoundries' 32 nm process. The Opteron has 2,400 million transistors and a die size of 2x 315 mm², while the Intel part's transistor count and die size are not recorded. The cache layouts differ: the Intel part has 64 KB L1 per core, 256 KB L2 per core, and 6 MB shared L3, while the Opteron has 768 KB L1 total, 2 MB L2 per module, and 8 MB L3 per die.

Memory support differs as well. The Intel part uses DDR4 without ECC, while the Opteron uses DDR3 with ECC support and a quad-channel bus delivering 51.2 GB/s. The Opteron supports PCIe Gen 2, while the Intel part's PCIe information is not recorded. The Intel part includes integrated Radeon RX Vega M GL graphics, the Opteron has none. The market segments are mobile for Intel and server or workstation for AMD. The release dates are 2018-01-31 for the Intel part and 2012-04-30 for the Opteron. The Opteron's launch MSRP is $988, and its part number is OS6278WKTGGGU. Neither processor has an unlocked multiplier. The Opteron's production status is End-of-life, while the Intel part is Active.