CPU Comparison

The Intel Atom x7809C and Intel Core i7-6700K represent two very different philosophies in processor design, separated by nearly a decade of architectural evolution. The data reveals a fascinating split: the Atom wins the majority of head-to-head tests, yet the Core i7 dominates in single-threaded throughput. The benchmark results show 11 wins for the Atom against 6 for the Core i7, but the margins and workload types tell a more complex story about which processor suits specific tasks.

Head-to-Head Benchmarks

The most striking result in the entire comparison is the PassMark data encryption test, where the Intel Atom x7809C delivers a 155.4% advantage over the Core i7-6700K. The Atom scores 7832 against the Core i7's 3067, a gap so large it suggests a fundamental difference in instruction handling rather than a marginal clock-speed advantage. This is the single largest delta in either direction.

The Cinebench suite shows consistent, if narrow, victories for the Atom across every render test. In Cinebench R15 multicore, the Atom scores 805 versus 765 for the Core i7, a 5.2% lead. The single-core R15 test shows 113 against 108, a 4.6% margin. This pattern repeats in R20 and R23, with the Atom holding a 5.3% advantage in multicore, single-core, and the newer R23 variants alike. The consistency across all six Cinebench tests suggests the Atom's architecture handles these workloads uniformly better, regardless of thread count.

The PassMark multithread test reinforces this trend, with the Atom scoring 9409 against 8927, a 5.4% win. The physics test shows an even larger 7.7% margin, with scores of 686 versus 637. In floating-point math, the Atom wins 17856 to 17375, a 2.8% edge, and the integer math test shows the same 2.8% delta at 28946 versus 28144.

The Core i7-6700K's wins are concentrated in specific areas. The PassMark single-thread test shows the Core i7 at 2500 versus the Atom's 1462, a massive 41.5% advantage. This is the largest margin in the Core i7's favor and highlights a critical weakness in the Atom's design. The extended instructions test shows a 33.2% lead for the Core i7, scoring 8248 against 5509. Data compression favors the Core i7 by 11.2%, with 125659 versus 111525. The remaining wins are narrow: prime number finding at 30 versus 29, and random string sorting at 15788 versus 15728, both within 3.3% and 0.4% respectively.

Architecture Differences

The architectural gap between these two processors is substantial. The Intel Atom x7809C uses the Amston Lake architecture built on a 10 nm process, while the Core i7-6700K uses Skylake on a 14 nm node. The Atom belongs to the Atom (Gracemont) generation and was released in 2024, while the Core i7 is from the Core i7 (Skylake) generation released in 2015.

Core counts differ significantly: the Atom has 8 cores and 8 threads, while the Core i7 has 4 cores and 8 threads. Both support 8 threads, but the Atom does so with physically separate cores rather than Hyper-Threading. The Atom's base clock is 2.00 GHz with a boost of 3.60 GHz, while the Core i7 starts at 4.00 GHz and boosts to 4.20 GHz. Despite the lower clock speeds, the Atom's newer architecture and additional cores allow it to match or exceed the Core i7 in most multi-threaded benchmarks.

Cache hierarchy shows distinct design choices. The Atom provides 96 KB of L1 per core and 2 MB of L2 per module, with 6 MB of shared L3. The Core i7 has 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. The Atom's larger L1 cache per core suggests a focus on keeping frequently accessed data close to the execution units, while the Core i7's larger L3 benefits from its older but more established memory hierarchy.

Power consumption is dramatically different. The Atom's TDP is 25 watts, while the Core i7-6700K draws 91 watts. This 66-watt difference is notable given the Atom's competitive performance. Memory support also differs: the Atom supports DDR4 and DDR5 with a single-channel memory bus delivering 38.4 GB/s bandwidth, while the Core i7 supports DDR3 and DDR4 depending on motherboard, using a dual-channel bus with 34.1 GB/s bandwidth. The Atom actually provides higher memory bandwidth despite the single-channel configuration.

PCIe connectivity favors the Core i7 with 16 Gen 3 lanes, while the Atom offers 9 Gen 3 lanes. The Core i7 also includes integrated HD Graphics 530, while the Atom has no integrated graphics. The Core i7 has an unlocked multiplier, whereas the Atom's is locked. The Atom uses Intel BGA 1264 socket, while the Core i7 uses Socket 1151.

Where Each One Wins

The Intel Atom x7809C is the clear winner in encryption-heavy workloads. The 155.4% advantage in data encryption is not a marginal gain but a transformative one, making the Atom the obvious choice for any application that relies heavily on cryptographic operations. The multiply and add operations in integer math and floating-point math also favor the Atom, with 2.8% margins in both categories.

For rendering and physics simulation, the Atom's edge is consistent. The Cinebench suite shows the Atom ahead in every version tested, from R15 through R23, in both single and multicore configurations. The physics benchmark's 7.7% lead indicates the Atom handles the complex calculations in physics engines better than the Core i7.

The Core i7-6700K wins decisively in single-threaded performance. The 41.5% margin in the PassMark single-thread test is the largest gap in the entire comparison. This makes the Core i7 the better choice for legacy applications that rely heavily on single-core performance, or for tasks where the software cannot efficiently utilize multiple cores. The 33.2% lead in extended instructions suggests the Core i7 handles SIMD and specialized instruction sets more effectively.

Data compression is another clear win for the Core i7, with an 11.2% advantage. This indicates better memory access patterns or more efficient use of its larger L3 cache. The Core i7's wins in prime number finding and random string sorting are narrow, suggesting these workloads are nearly neutral between the two processors.

The Verdict

The data supports the Intel Atom x7809C as the better overall processor for modern, multi-threaded workloads. With 11 wins out of 17 head-to-head benchmarks, the Atom demonstrates superior performance in rendering, physics, encryption, and general math operations. The consistent 5.3% lead across the Cinebench suite indicates the Atom's architecture handles these tasks more efficiently despite lower clock speeds. The 155.4% encryption advantage is the standout result, making the Atom the only choice for security-focused applications.

The Intel Core i7-6700K remains relevant for single-threaded applications. The 41.5% lead in single-thread performance is substantial, and the 33.2% advantage in extended instructions shows the Core i7's older architecture still excels in specific instruction sets. The data compression win of 11.2% also favors the Core i7 for archiving and file compression tasks.

The average benchmark scores reflect the overall parity: the Atom scores 12607 against the Core i7's 12237, a difference of about 3% in the Atom's favor. Both processors sit at the 67th percentile of all CPUs. The Atom's nearest rivals include the Intel Core i3-1215U at 12604 and the Core i5-1230U at 12559, while the Core i7's nearest rivals include the Core i3-10105 at 12316 and the Core i3-12100 at 12054.

FAQ

Q: Which processor has better multi-core performance?

A: The Intel Atom x7809C wins in every multi-core benchmark. Cinebench R23 multicore shows 7997 versus 7594, a 5.3% lead, and the PassMark multithread test shows 9409 versus 8927, a 5.4% advantage.

Q: Is the Core i7-6700K better for single-threaded tasks?

A: Yes, significantly. The PassMark single-thread test shows the Core i7 at 2500 versus the Atom's 1462, a 41.5% advantage. The Core i7 also wins the extended instructions test by 33.2%.

Q: How do the processor architectures differ?

A: The Atom uses Amston Lake architecture on a 10 nm process with 8 Gracemont cores. The Core i7 uses Skylake on a 14 nm process with 4 cores and Hyper-Threading for 8 threads. The Atom has a 25-watt TDP, while the Core i7 draws 91 watts.

Q: What is the biggest performance gap between the two?

A: The PassMark data encryption test shows the Atom leading by 155.4%, scoring 7832 against the Core i7's 3067. The largest Core i7 win is 41.5% in the PassMark single-thread test.

Q: Which processor supports more memory types?

A: The Atom supports DDR4 and DDR5 with a single-channel bus delivering 38.4 GB/s. The Core i7 supports DDR3 and DDR4 depending on the motherboard, using a dual-channel bus with 34.1 GB/s.

Q: How many benchmark wins does each processor have?

A: The Intel Atom x7809C wins 11 head-to-head benchmarks, while the Intel Core i7-6700K wins 6. The Atom's wins include all Cinebench tests and encryption, while the Core i7 wins single-thread and extended instruction tests.