AMD A8-7670K vs AMD Opteron 4386 Comparison

The AMD Opteron 4386 and AMD A8-7670K represent two distinct approaches to processor design from the same manufacturer, separated by nearly three years of architectural evolution. The Opteron 4386 is a server-oriented eight-core part built on the Piledriver architecture, while the A8-7670K is a desktop-focused quad-core chip using the newer Steamroller design. Despite their different market segments, they land remarkably close in overall benchmark performance, with the Opteron 4386 holding a narrow but consistent edge across every recorded test.

Head-to-Head Benchmarks

The benchmark data shows a complete sweep for the AMD Opteron 4386 across all five Cinebench tests, though the margins are consistently small. In Cinebench R15 multicore, the Opteron 4386 scores 280 against the A8-7670K’s 276, a 1.4% advantage. This pattern repeats in Cinebench R20 multicore, where the Opteron 4386 posts 1168 versus 1152 for the A8-7670K, again a 1.4% difference.

Single-core tests tell a similar story. In Cinebench R20 single-core, the Opteron 4386 records 164 points, while the A8-7670K manages 162, giving the server chip a 1.2% lead. The Cinebench R23 suite mirrors these results: multicore shows 2782 for the Opteron 4386 against 2745 for the A8-7670K (a 1.3% gap), and single-core shows 392 versus 387 (also 1.3%).

The narrowness of these margins is striking given the hardware differences. The Opteron 4386 has twice the core count (8 versus 4) and twice the L2 cache (8 MB versus 4 MB), yet it only outperforms the A8-7670K by roughly one to two percent in every workload. This suggests that the Steamroller architecture in the A8-7670K delivers substantially better per-core efficiency than the older Piledriver design, compensating for the Opteron’s raw resource advantage.

Looking at the broader database context, the Opteron 4386 sits at the 26th percentile among all CPUs with an average benchmark score of 957. Its nearest rivals include the Intel Core i7-950 at an identical 957 average score (0% delta), the AMD Athlon X4 870K at 956 (0.1% delta), and the AMD Ryzen Embedded R1600 at 958 (-0.1% delta). The A8-7670K, meanwhile, holds the 25th percentile with an average score of 944. Its closest competitors are the Intel Core i3-1110G4 at 945 (-0.1% delta), the AMD Athlon X4 860K at 943 (0.1% delta), and the AMD Phenom II X6 1045T at 946 (-0.2% delta). The 13-point gap in average scores between these two processors places them in essentially the same performance tier, despite their divergent designs.

Architecture Differences

The Opteron 4386 belongs to the Opteron 4000 series, codenamed Seoul, and uses the Piledriver architecture built on a 32 nm process node. It integrates 1,200 million transistors across a 315 mm² die. Its cache hierarchy includes 384 KB of L1, 8 MB of L2, and 8 MB of shared L3 cache. The processor runs at a 3.10 GHz base clock with a 3.80 GHz boost clock, has a 95 W TDP, and fits into the AMD Socket C32. It supports DDR3 memory without ECC capability, and its market segment is explicitly Server/Workstation. The part number is OS4386WLU8KHK, and its multiplier is locked.

The A8-7670K, by contrast, uses the Steamroller architecture, codenamed Godaveri, built on a 28 nm process node at GlobalFoundries. It packs 2,411 million transistors into a smaller 245 mm² die. Its cache layout is simpler: 256 KB of L1 and 4 MB of L2, with no L3 cache at all. The base clock is higher at 3.60 GHz, boosting to 3.90 GHz, with the same 95 W TDP. It uses the AMD Socket FM2+ and supports dual-channel DDR3 memory with a measured bandwidth of 34.1 GB/s. The chip includes integrated Radeon R7 graphics, a feature the Opteron lacks entirely. PCIe support is Gen 3 with 16 lanes from the CPU. The A8-7670K has an unlocked multiplier, making it overclockable, and its market segment is Desktop. Its production status is marked as end-of-life, and its release date is later than the Opteron’s by about two and a half years.

The most significant architectural contrasts are clear. The Opteron 4386 offers eight Piledriver cores with shared L3 cache, targeting multi-threaded server workloads. The A8-7670K offers four Steamroller cores with higher clocks, no L3, and integrated graphics, targeting desktop use. The transistor count difference (2,411 million versus 1,200 million) reflects both the newer process node and the inclusion of the Radeon R7 GPU on the A8-7670K. The die size difference (245 mm² versus 315 mm²) shows that the newer process node allows more transistors in a smaller area.

Another notable difference is memory bandwidth. The A8-7670K specifies a dual-channel memory bus with 34.1 GB/s bandwidth, while the Opteron 4386 lists no specific memory bus configuration or bandwidth figure in the database. Both support DDR3, but the A8-7670K’s memory subsystem is explicitly characterized as dual-channel, which is typical for desktop platforms of that era.

The release dates also inform their positions. The Opteron 4386 launched in December 2012, while the A8-7670K arrived in July 2015. This means the A8-7670K benefits from roughly two and a half years of architectural refinement, which explains how a quad-core part can nearly match an eight-core server processor in multi-threaded tests.

Where Each One Wins

The Opteron 4386 wins all five recorded benchmarks, but the practical significance of those wins depends on the workload. In multi-threaded rendering tasks like Cinebench R15, R20, and R23, the Opteron 4386’s eight cores provide a slight edge, ranging from 1.3% to 1.4% over the A8-7670K. For users running heavily parallel workloads, such as video encoding, 3D rendering, or scientific simulations, the Opteron 4386 is the safer choice based on the data, even if the margin is modest.

In single-threaded tests, the Opteron 4386 also leads, but only by 1.2% to 1.3%. This is more surprising given the A8-7670K’s higher base and boost clocks (3.60/3.90 GHz versus 3.10/3.80 GHz). The Steamroller architecture’s improved instruction-level efficiency should theoretically favor the A8-7670K in single-core tasks, yet the recorded scores show the opposite. This could indicate that the Opteron 4386’s larger L2 and L3 caches compensate for its lower clock speeds in the specific Cinebench workloads.

The A8-7670K, despite losing every benchmark, has clear advantages that the data does not directly measure. Its integrated Radeon R7 graphics make it a complete APU solution for systems without a discrete GPU. Its unlocked multiplier allows user-controlled overclocking, which could narrow or reverse the performance gap in real-world use. Its higher base clock (3.60 GHz versus 3.10 GHz) means it may feel more responsive in lightly threaded tasks, even if the Cinebench single-core scores do not reflect this. The memory bandwidth figure of 34.1 GB/s suggests strong dual-channel performance for a desktop platform.

For desktop users who prioritize upgradeability, the A8-7670K’s FM2+ socket and unlocked multiplier offer flexibility. For server or workstation users who need consistent multi-threaded throughput and a platform designed for long-term operation, the Opteron 4386’s C32 socket and eight-core layout are more aligned with those goals. The Opteron 4386 also has a higher average benchmark score (957 versus 944) and a slightly higher percentile ranking (26 versus 25), reinforcing its overall lead.

FAQ

Q: Which processor has more cores?

A: The AMD Opteron 4386 has 8 cores and 8 threads, while the AMD A8-7670K has 4 cores and 4 threads.

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

A: The Opteron 4386 scores 2782, and the A8-7670K scores 2745, giving the Opteron 4386 a 1.3% lead.

Q: Does the A8-7670K have integrated graphics?

A: Yes, the A8-7670K includes integrated Radeon R7 graphics, while the Opteron 4386 has no integrated graphics.

Q: Are both processors unlocked for overclocking?

A: No. The A8-7670K has an unlocked multiplier, but the Opteron 4386 does not.

Q: How do their average benchmark scores compare?

A: The Opteron 4386 has an average benchmark score of 957, while the A8-7670K has 944, a difference of 13 points.

Q: What memory bandwidth does the A8-7670K support?

A: The A8-7670K supports dual-channel DDR3 with a bandwidth of 34.1 GB/s. The Opteron 4386 lists DDR3 support but no specific bandwidth figure.

Q: Which processor has a larger L3 cache?

A: The Opteron 4386 has 8 MB of shared L3 cache, while the A8-7670K has no L3 cache.

The Verdict

The recorded data points to a clear, if narrow, victory for the AMD Opteron 4386. It wins all five Cinebench tests, holds a higher average benchmark score (957 versus 944), and ranks one percentile higher among all CPUs. For workloads that scale with core count, such as multi-threaded rendering, the Opteron 4386’s eight cores deliver a consistent, measurable advantage over the A8-7670K’s four cores, even if the percentage differences are small (1.3% to 1.4%).

However, the verdict is not simply about benchmark wins. The A8-7670K is a desktop APU with integrated graphics, an unlocked multiplier, and a higher base clock. It suits users building a compact or budget-conscious desktop system who do not plan to add a discrete GPU and who may want to overclock. Its newer Steamroller architecture and 28 nm process node make it a more modern design, and its end-of-life status suggests it was a mature product by the time it was measured.

The Opteron 4386 is a server/workstation processor with no integrated graphics, a locked multiplier, and a larger die (315 mm² versus 245 mm²). Its 8 MB of shared L3 cache and 8 MB of L2 cache give it a memory hierarchy advantage that likely explains its single-core wins despite lower clocks. For users who need a CPU for a server board or who prioritize multi-threaded throughput in a professional context, the Opteron 4386 is the data-backed choice.

That said, the performance gap is almost negligible in practice. A 1.2% to 1.4% difference across all tests means that real-world application performance will be nearly identical for most users. The decision should rest on platform features rather than raw speed. If the system requires integrated graphics, an unlocked multiplier, or a desktop FM2+ motherboard, the A8-7670K is the only viable option of the two. If the system uses a C32 socket server platform or demands the higher core count for parallel workloads, the Opteron 4386 is the better fit.

The database also places both processors in similar company. The Opteron 4386’s nearest rival, the Intel Core i7-950, matches its average score exactly at 957. The A8-7670K’s nearest rival, the Intel Core i3-1110G4, sits just one point higher at 945. This indicates that neither processor stands out dramatically against its peers, and both occupy a mid-range performance tier from a historical perspective.

In summary, the Opteron 4386 is the winner on every measured benchmark, but the A8-7670K offers features that the benchmarks do not capture, namely integrated graphics, overclocking capability, and a more modern architecture. Users should choose based on their platform requirements and workload patterns, with the understanding that the performance difference between these two chips is minimal.