CPU Comparison

The Intel Core i7-3630QM and the Intel Atom x7425E present a fascinating study in generational divergence. The former is a 2012 quad-core mobile flagship from the Ivy Bridge era, while the latter is a 2023 low-power Atom part built on Alder Lake-N architecture. Despite their vastly different origins, TDP envelopes, and market positions, benchmark data reveals a surprising statistical dead heat across all tested workloads, with the Atom emerging as the narrow victor in every single head-to-head test.

Where Each One Wins

The data shows a clear, though narrow, sweep for the Intel Atom x7425E. It wins all six head-to-head benchmark comparisons, but the margins are razor-thin, ranging from a 0.8% to a 1.6% advantage. This is not a case of one processor dominating another; rather, it indicates that the Atom x7425E holds a slight but consistent edge in both single-threaded and multi-threaded Cinebench workloads.

The Core i7-3630QM finds its competitive footing in the broader benchmark landscape. While it loses every direct comparison to the Atom, its average benchmark score of 1289 is actually slightly higher than the Atom's 1273 average. This discrepancy suggests that in other, non-Cinebench workloads not listed in the head-to-head data, the older i7 maintains a statistical advantage. The i7 also edges out the Atom in its nearest rival comparisons; the i7-3630QM sits 0.1% above the AMD Opteron 6272, while the Atom x7425E is exactly level with the Intel Core i5-4430S.

For users, this means the Atom x7425E is the more consistent performer in the specific rendering tasks tested, while the i7-3630QM might offer a slight edge in untested scenarios. The real differentiation, however, is not in performance but in the platform characteristics. The i7-3630QM's 45W TDP and dual-channel DDR3 memory support contrast sharply with the Atom's 12W TDP and single-channel memory controller, pointing to very different intended use cases.

Architecture Differences

The architectural chasm between these two chips is immense. The i7-3630QM is built on Intel's 22 nm Ivy Bridge process, featuring 1,480 million transistors on a 160 mm² die. It employs a traditional high-performance core design with 4 cores and 8 threads via Hyper-Threading. Its cache hierarchy consists of 64 KB of L1 and 256 KB of L2 per core, plus a 6 MB shared L3 cache.

The Atom x7425E, by contrast, is a product of Intel's 10 nm process and uses the Alder Lake-N architecture with Gracemont efficiency cores. It has 4 cores and 4 threads, lacking any simultaneous multithreading. Its cache layout is notably different: 96 KB of L1 per core, a shared 2 MB L2, and a shared 6 MB L3. This means the Atom has more L1 cache per core and a larger L2 pool, but the overall L3 capacity is identical.

Memory support further separates them. The i7-3630QM uses dual-channel DDR3 with a theoretical bandwidth of 25.6 GB/s. The Atom x7425E supports both DDR4 and DDR5 but operates on a single-channel bus, achieving a higher peak bandwidth of 38.4 GB/s. The PCIe configurations also differ: the i7 offers 16 Gen 3 lanes, while the Atom provides 9 Gen 3 lanes.

Integrated graphics tell a similar story of generational shift. The i7-3630QM packs the Intel HD 4000, while the Atom x7425E includes UHD Graphics with 24 execution units. Neither part supports ECC memory, and both are locked (multiplier unlocked: false). The i7 uses the Intel Socket G2 (988B), whereas the Atom is soldered to the BGA 1264 package.

The Verdict

The benchmark data presents a clear verdict: for raw Cinebench performance, the Intel Atom x7425E is the winner, taking all six head-to-head tests. The margins, however, are so small that they border on statistical noise. The Atom's 0.8% to 1.6% leads in multi-core and single-core tests respectively do not represent a meaningful performance advantage for real-world applications.

The i7-3630QM, despite being a decade older, holds its own remarkably well. Its higher average benchmark score of 1289 versus the Atom's 1273 suggests that in a broader suite of tests, it might actually be the faster processor. The i7 also offers dual-channel memory, which can benefit memory-sensitive workloads, and a much higher TDP of 45W, indicating it was designed for sustained performance in larger laptops.

The Atom x7425E's 12W TDP, on the other hand, makes it the obvious choice for fanless or ultra-portable designs where power efficiency is paramount. Its newer architecture delivers comparable performance at a fraction of the power draw. For a user building a low-power, always-on system, the Atom is the clear pick. For anyone needing maximum compatibility with older DDR3 platforms or requiring a traditional mobile CPU socket, the i7-3630QM remains a viable, if end-of-life, option.

FAQ

Q: Which processor has a higher single-core Cinebench R23 score?

A: The Intel Atom x7425E scores 621 in Cinebench R23 single-core, while the Intel Core i7-3630QM scores 616. The Atom leads by 0.8%.

Q: How do the two compare in multi-threaded performance?

A: The Atom x7425E wins all multi-core tests, including Cinebench R23 multi-core with a score of 4403 versus the i7-3630QM's 4364. The margin is 0.9% in favor of the Atom.

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

A: The Intel Core i7-3630QM has a TDP of 45W, while the Intel Atom x7425E has a TDP of 12W, making the Atom significantly more power-efficient.

Q: Do both processors support ECC memory?

A: No, neither the Intel Core i7-3630QM nor the Intel Atom x7425E supports ECC memory.

Q: What are the memory bandwidth specifications?

A: The i7-3630QM uses dual-channel DDR3 with 25.6 GB/s bandwidth. The Atom x7425E uses single-channel DDR4 or DDR5 with a higher peak bandwidth of 38.4 GB/s.

Q: Which processor has a higher average benchmark score?

A: The Intel Core i7-3630QM has an average benchmark score of 1289, which is slightly higher than the Intel Atom x7425E's average of 1273.

Head-to-Head Benchmarks

The head-to-head data is remarkably one-sided in favor of the Atom x7425E, yet the magnitudes are almost imperceptible. In Cinebench R15 multi-core, the Atom scores 443 against the i7's 439, a delta of just -0.9%. The single-core R15 test shows a 62 to 61 result, a 1.6% lead for the Atom.

Moving to Cinebench R20, the pattern holds. The Atom takes multi-core with 1849 versus 1832, again a 0.9% difference. In single-core, it scores 260 against 258, a 0.8% edge. The most recent Cinebench R23 results mirror this exactly: the Atom wins multi-core with 4403 over 4364 (0.9% gap) and single-core with 621 over 616 (0.8% gap).

The consistency of these results is striking. The Atom x7425E's advantage is nearly uniform across all Cinebench versions, suggesting a fundamental, if small, architectural efficiency gain. The i7-3630QM's 8 threads provide no benefit in these tests, as the Atom's 4 Gracemont cores with their larger L1 and L2 caches are able to match or slightly exceed the older Ivy Bridge design.

The i7-3630QM's only quantitative counterpoint comes from its average benchmark score of 1289 versus the Atom's 1273. This 16-point gap, not reflected in the head-to-head tests, hints that the i7 may outperform the Atom in other applications, potentially those that benefit from its dual-channel memory bus or higher 45W power envelope.

Specification Differences

The two processors differ in nearly every measurable specification except core count and base architecture manufacturer. The i7-3630QM has 4 cores and 8 threads, while the Atom x7425E has 4 cores and 4 threads. The base clock speeds are presented differently: the i7 runs at 2.40 GHz, while the Atom's base clock is listed as 1500.00 MHz. Both share a boost clock of 3.40 GHz.

The TDP is a major differentiator: 45W for the i7 versus 12W for the Atom. The i7 uses the Intel Socket G2 (988B), whereas the Atom is on Intel BGA 1264. The i7 is built on a 22 nm process with Ivy Bridge architecture, while the Atom uses a 10 nm process with Alder Lake-N architecture and Gracemont cores. The i7 has 1,480 million transistors on a 160 mm² die; the Atom's transistor count and die size are not listed.

Cache layouts differ significantly. The i7 has 64 KB of L1 and 256 KB of L2 per core, plus 6 MB of shared L3. The Atom has 96 KB of L1 per core, 2 MB of shared L2, and 6 MB of shared L3. Memory support is DDR3 for the i7 versus DDR4/DDR5 for the Atom. The i7 uses a dual-channel memory bus with 25.6 GB/s bandwidth; the Atom uses a single-channel bus with 38.4 GB/s bandwidth. PCIe lanes are 16 for the i7 versus 9 for the Atom. Integrated graphics are Intel HD 4000 on the i7 and UHD Graphics 24EU on the Atom. The i7 was released in 2012 and is end-of-life, while the Atom was released in 2023 and remains active.