AMD A6-9400 vs Intel Core 2 Extreme QX9650 Comparison

The AMD A6-9400 and Intel Core 2 Extreme QX9650 represent two very different approaches to desktop computing, separated by over a decade of architectural evolution. The data shows a consistent, albeit modest, performance advantage for the AMD part across every shared benchmark, despite the Intel chip offering twice the core count. The A6-9400 wins all five head-to-head comparisons, with an average benchmark score of 794 compared to the QX9650's 789, placing both firmly in the 21st percentile of all CPUs.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head data is the uniformity of AMD's victory. In Cinebench R15 multi-core, the A6-9400 scores 232 against the QX9650's 209, a delta of 11%. This gap widens slightly in Cinebench R20 multi-core, where the AMD part posts 969 versus 872, an 11.1% advantage. The trend continues in Cinebench R23 multi-core, with the A6-9400 reaching 2309 and the Intel chip managing 2077, representing an 11.2% lead.

Single-core results tell the same story. In Cinebench R20 single-core, the A6-9400 scores 136 compared to 123 for the QX9650, a 10.6% margin. The Cinebench R23 single-core test shows the AMD processor at 326 versus 293, an 11.3% delta — the largest single-core gap in the comparison. These results are particularly telling because the Intel chip's higher core count does not translate into a multi-core advantage; the AMD dual-core part outpaces the Intel quad-core in every threaded workload.

The benchmark data also reveals how close these processors are to their immediate competitors. The A6-9400's nearest rival is the AMD A10-5800B, with an identical average score of 794 and a delta of just 0.1%. The Intel Core 2 Extreme QX9770 trails both by a narrow margin, scoring 790, which is 0.5% behind the A6-9400 and 0.1% behind the QX9650. The QX9650's closest match is the AMD Opteron 3350 HE at 789, with a 0% delta, followed by the Intel Core i5-4210U at 788.

Architecture Differences

The architectural divide between these two processors is substantial. The AMD A6-9400 is built on the Excavator architecture, specifically the Bristol Ridge codename, using a 28 nm process from GlobalFoundries. It integrates 3,100 million transistors on a 250 mm² die. In contrast, the Intel Core 2 Extreme QX9650 uses the Core 2 architecture with the Yorkfield codename, manufactured on Intel's 45 nm process with 820 million transistors spread across a dual-die configuration of 2x 107 mm².

Core configuration is where the most obvious difference lies. The A6-9400 has 2 cores and 2 threads, while the QX9650 has 4 cores and 4 threads. Clock speeds favor the AMD chip, which runs at a base of 3.40 GHz and boosts to 3.70 GHz. The Intel part has a base clock of 3.00 GHz with no boost clock listed. Power consumption is dramatically different: the A6-9400 has a TDP of 65 watts, while the QX9650 draws 130 watts — exactly double.

Cache hierarchies are also distinct. The AMD processor has 160 KB of L1 cache and 1 MB of shared L2 cache, with no L3 cache. The Intel chip offers 64 KB of L1 cache per core and a substantial 12 MB of shared L2 cache. Memory support diverges sharply: the A6-9400 uses DDR4 memory with dual-channel support and a memory bandwidth of 38.4 GB/s, while the QX9650 supports DDR1, DDR2, and DDR3, also dual-channel, but with no bandwidth figure listed. Both lack ECC memory support.

Platform features further separate these chips. The A6-9400 uses AMD Socket AM4 with PCIe Gen 3 and 8 CPU lanes, includes integrated Radeon R5 graphics, and has a locked multiplier. The QX9650 uses Intel Socket 775 with PCIe Gen 2, offers integrated graphics only as a chipset feature on certain motherboards, and has an unlocked multiplier for overclocking. The AMD part remains in active production, released in 2019, while the Intel chip is end-of-life, having launched in 2007.

Where Each One Wins

Based strictly on the benchmark data, the AMD A6-9400 wins every single test in the comparison. This makes the use-case analysis straightforward: the A6-9400 is the superior choice for any workload represented by the Cinebench suite. The consistent 10-11% advantage across both single-core and multi-core tests suggests the AMD architecture handles both lightly-threaded and fully-threaded applications more efficiently.

The QX9650's lack of wins does not necessarily make it useless, but the data provides no evidence of a scenario where it outperforms the A6-9400. Its higher core count (4 versus 2) might theoretically benefit heavily parallel workloads, but the Cinebench multi-core results contradict this expectation. The Intel chip's 12 MB of shared L2 cache is substantially larger than AMD's 1 MB, yet this does not translate into a measurable performance advantage in the tested workloads.

The A6-9400's integrated Radeon R5 graphics is a feature the QX9650 lacks entirely, making the AMD part more suitable for systems without a discrete GPU. The Intel chip's unlocked multiplier could be an advantage for overclocking enthusiasts, but no overclocking performance data exists in the benchmark results. The AMD processor's lower TDP (65 watts versus 130 watts) indicates better power efficiency, though specific power consumption figures are not part of the benchmark data.

The Verdict

The data points to a clear conclusion: the AMD A6-9400 is the better processor in this comparison. It wins all five head-to-head benchmarks with margins ranging from 10.6% to 11.3%. The average benchmark score of 794 versus 789 reinforces this outcome, as does the percentile ranking where both sit at 21% but the AMD part edges ahead in raw score.

For users prioritizing raw multi-threaded performance, the A6-9400's victory in every Cinebench multi-core test is decisive. The fact that a 2-core, 2-thread processor beats a 4-core, 4-thread processor in multi-threaded workloads confirms the architectural efficiency of the newer Excavator design versus the aging Core 2 architecture. The single-core results, where the A6-9400 leads by roughly 11%, further solidify its position.

The QX9650's strengths are limited to areas not covered by the benchmark data. Its unlocked multiplier offers overclocking potential, and its broad memory support (DDR1, DDR2, DDR3) provides flexibility with older hardware. However, these attributes do not appear in the performance metrics. For anyone choosing between these two based on the available evidence, the AMD A6-9400 is the recommended pick. Its active production status and modern platform (AM4, DDR4, PCIe Gen 3) also suggest better long-term viability compared to the end-of-life Intel part.

FAQ

Q: Which processor has a higher average benchmark score?

A: The AMD A6-9400 has an average benchmark score of 794, while the Intel Core 2 Extreme QX9650 scores 789.

Q: What is the largest performance margin in the head-to-head tests?

A: The largest margin is 11.3%, achieved by the AMD A6-9400 in Cinebench R23 single-core, scoring 326 against the QX9650's 293.

Q: How do the core counts differ between these two CPUs?

A: The AMD A6-9400 has 2 cores and 2 threads, while the Intel Core 2 Extreme QX9650 has 4 cores and 4 threads.

Q: Does the Intel chip have any benchmark wins over the AMD chip?

A: No. The head-to-head data shows the AMD A6-9400 winning all 5 benchmarks, with the Intel QX9650 winning 0.

Q: What is the TDP difference between the two processors?

A: The AMD A6-9400 has a TDP of 65 watts, while the Intel Core 2 Extreme QX9650 has a TDP of 130 watts.

Q: Which processor supports DDR4 memory?

A: The AMD A6-9400 supports DDR4 memory with dual-channel configuration and 38.4 GB/s bandwidth. The Intel QX9650 supports DDR1, DDR2, and DDR3.