CPU Comparison

AMD’s A10-7850K and A6-9400 are both 28 nm desktop parts, but they represent very different design philosophies and eras. The A10-7850K is a 2014-era quad-core Steamroller chip on Socket FM2+, while the A6-9400 is a 2019 dual-core Excavator part on Socket AM4. Benchmark data reveals a near-total performance parity in aggregate scoring, yet the underlying metrics tell a story of divergent strengths. The A10-7850K averages a benchmark score of 796, while the A6-9400 sits just two points lower at 794, a razor-thin 0.2% margin. Both CPUs land in the 21st percentile of all processors tracked. This is a clash of core count versus architectural efficiency, and the data shows that the outcome depends heavily on the workload.

Head-to-Head Benchmarks

The most striking aspect of this comparison is the absence of overlapping benchmark data. The FACT PACK lists Geekbench results for the A10-7850K and Cinebench results for the A6-9400, with no direct head-to-head test scores shared between them. This means a direct apples-to-apples comparison on a single test is impossible from the available data. Instead, the aggregate average benchmark scores serve as the primary point of reference. Here, the A10-7850K edges ahead with a 796 average versus the A6-9400’s 794, a negligible 0.2% difference that places them in a statistical dead heat.

Looking at the nearest rival data, the A10-7850K’s closest competitor is the AMD Ryzen Embedded R1606G, which scores 797. The delta between them is -0.1%, meaning the A10-7850K trails that embedded chip by a single point. The A6-9400, by contrast, is bracketed by the AMD A10-5800B (794, 0.1% delta) and the Intel Core 2 Extreme QX9770 (790, 0.5% delta). Both AMD parts are effectively clustered within a seven-point range, from 790 to 797, alongside the Intel Pentium Silver J5040 (801, -0.6% delta against the A10-7850K). This tight grouping underscores that neither processor offers a meaningful aggregate performance advantage over the other, or over several older and embedded rivals.

Where the data does diverge is in the specific benchmark suites. The A10-7850K’s Geekbench multicore score is 1139, with a single-core score of 453. The A6-9400’s Cinebench R20 multicore score is 969, and its single-core score is 136. These are different workloads, so direct numeric comparison is misleading. However, the ratios are informative. The A10-7850K’s multicore-to-singlecore Geekbench ratio is 2.51, reflecting its four physical cores. The A6-9400’s Cinebench R20 multicore-to-singlecore ratio is 7.13, which seems anomalous until one considers that Cinebench R20 scales differently across architectures. The A6-9400’s Cinebench R23 scores, 2309 multicore and 326 singlecore, yield a ratio of 7.08. This suggests the A6-9400’s dual-core design scales better in Cinebench’s multi-threaded tests than the A10-7850K’s quad-core does in Geekbench, likely due to architectural improvements in Excavator over Steamroller.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD A10-7850K averages 796 across all benchmark scores, while the AMD A6-9400 averages 794. This represents a 0.2% difference in favor of the A10-7850K, with both sitting at the 21st percentile of all CPUs.

Q: How do the two chips compare in terms of core and thread counts?

A: The A10-7850K features four cores and four threads, while the A6-9400 has two cores and two threads. The A10-7850K’s core count is double that of the A6-9400, yet its aggregate benchmark score is only 0.2% higher.

Q: What is the socket compatibility for each processor?

A: The A10-7850K uses the AMD Socket FM2+, while the A6-9400 uses the AMD Socket AM4. This is a critical difference, as the two sockets are not interchangeable and require different motherboards.

Q: Which processor supports DDR4 memory?

A: Only the A6-9400 supports DDR4 memory. The A10-7850K is limited to DDR3. The A6-9400 also features dual-channel memory support with a bandwidth of 38.4 GB/s.

Q: Are either of these processors unlocked for overclocking?

A: The A10-7850K has an unlocked multiplier, making it overclocking-friendly. The A6-9400 does not have an unlocked multiplier, so its clock speeds are fixed by AMD’s specifications.

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

A: The A10-7850K is listed as end-of-life, meaning it is no longer in active production. The A6-9400 is listed as active, indicating it is still being manufactured and sold.

Where Each One Wins

The A10-7850K wins in scenarios that demand raw multi-threaded throughput from multiple cores. Its four cores and four threads give it a structural advantage in workloads that can utilize parallel execution, and its Geekbench multicore score of 1139 reflects that capability. It also wins for enthusiasts who want to push performance manually, thanks to its unlocked multiplier. The A10-7850K’s larger L2 cache of 4 MB (versus 1 MB shared on the A6-9400) and 256 KB of L1 cache further support cache-sensitive multi-threaded tasks. For users on the FM2+ platform, it is the higher-core-count option.

The A6-9400 wins in efficiency and modern platform compatibility. Its 65 W TDP is significantly lower than the A10-7850K’s 95 W, making it a better fit for compact or power-conscious builds. Its support for DDR4 memory and dual-channel bandwidth of 38.4 GB/s gives it a memory subsystem advantage over the older DDR3-based A10-7850K. The A6-9400 also benefits from being an active product on the AM4 socket, which offers a more current upgrade path. Its Cinebench R23 multicore score of 2309, while not directly comparable to Geekbench, shows that the newer Excavator architecture extracts respectable performance from just two cores. For single-threaded tasks, the A6-9400’s Cinebench R20 single-core score of 136 and R23 single-core score of 326 indicate that its per-core efficiency is competitive despite the lower clock speeds.

Specification Differences

The two processors diverge on nearly every core specification. The A10-7850K has four cores and four threads, while the A6-9400 has two cores and two threads. Base clocks differ: the A10-7850K runs at 3.70 GHz, boosting to 4.00 GHz, whereas the A6-9400 runs at 3.40 GHz and boosts to 3.70 GHz. The A10-7850K has a higher TDP of 95 W, compared to the A6-9400’s 65 W. Socket compatibility is entirely different, FM2+ for the A10-7850K versus AM4 for the A6-9400. Cache configurations are also distinct: the A10-7850K has 256 KB of L1 and 4 MB of L2, while the A6-9400 has 160 KB of L1 and 1 MB shared L2. Memory support favors the A6-9400, which uses DDR4 with dual-channel support and 38.4 GB/s bandwidth; the A10-7850K is limited to DDR3. PCIe lane counts differ as well, with the A10-7850K offering 16 lanes (CPU only) versus the A6-9400’s 8 lanes (CPU only). The A10-7850K has an unlocked multiplier, while the A6-9400 does not. Integrated graphics differ, with the A10-7850K featuring Radeon R7 and the A6-9400 featuring Radeon R5.

Architecture Differences

The architectural gap between these chips is substantial. The A10-7850K is built on the Steamroller architecture, codenamed Kaveri, and represents AMD’s fourth-generation APU design. It uses a 28 nm process node from GlobalFoundries, with 2,411 million transistors on a 245 mm² die. The A6-9400 is built on the Excavator architecture, codenamed Bristol Ridge, which is a later refinement of AMD’s modular design philosophy. It also uses a 28 nm process node from GlobalFoundries but packs 3,100 million transistors on a slightly larger 250 mm² die. Despite having fewer cores, the A6-9400’s die contains nearly 29% more transistors than the A10-7850K, reflecting the architectural enhancements in Excavator. The A6-9400’s cache hierarchy is more streamlined, 1 MB of shared L2 versus the A10-7850K’s 4 MB, but the newer architecture is designed to be more efficient with its smaller cache. The A6-9400 also supports newer memory technology (DDR4) and a more modern socket (AM4), whereas the A10-7850K is tied to the older DDR3 and FM2+ platform. The A10-7850K’s unlocked multiplier and higher TDP suggest it was aimed at enthusiasts, while the A6-9400’s lower TDP and locked multiplier indicate a focus on mainstream efficiency. Both lack ECC memory support and L3 cache, but the A6-9400’s newer design offers better memory bandwidth and a more current feature set, making it the more forward-looking choice despite its smaller core count.