AMD Ryzen 5 7640U vs AMD Ryzen 7 7730U Comparison

The AMD Ryzen 7 7730U and AMD Ryzen 5 7640U are both 7000-series mobile processors, yet they represent two distinct design philosophies within AMD’s lineup. The 7730U is an 8-core Zen 3 part built on a mature 7 nm process, while the 7640U is a 6-core Zen 4 chip on a newer 4 nm node. Despite the 7730U having more cores, the benchmark data shows the 7640U winning 15 of 17 head-to-head comparisons, often by substantial margins. This analysis explores how architectural differences translate into real performance gaps, questioning whether core count or modern IPC matters more in this matchup.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 7 7730U has 8 cores and 16 threads, while the AMD Ryzen 5 7640U has 6 cores and 12 threads. The 7730U also has a larger total L2 cache at 512 KB per core versus 1 MB per core on the 7640U, though the 7640U’s per-core L2 is twice as large.

Q: How do their single-core performances compare?

A: The Ryzen 5 7640U dominates single-core tests. In Cinebench R23 single-core, the 7640U scores 2532 versus 1454.5 for the 7730U, a 42.6% advantage. Geekbench single-core shows a similar gap: 2127 versus 1541, a 27.6% difference favoring the 7640U.

Q: Which chip wins in multi-core workloads?

A: Surprisingly, the 6-core 7640U wins most multi-core tests despite having fewer cores. In Cinebench R23 multi-core, the 7640U scores 17936 versus 10801.5 for the 7730U, a 39.8% lead. The only multi-core win for the 7730U is in PassMark integer math, where it scores 72352 versus 70483, a 2.7% margin.

Q: What are the key architectural differences?

A: The 7730U uses Zen 3 architecture on a 7 nm TSMC process (codename Barcelo-R), while the 7640U uses Zen 4 on a 4 nm process (codename Phoenix). The 7640U supports DDR5 memory with 89.6 GB/s bandwidth, whereas the 7730U uses DDR4 with 51.2 GB/s. The 7640U also has PCIe Gen 4 with 20 lanes versus Gen 3 with 16 lanes on the 7730U.

Q: Which processor has a better integrated GPU?

A: The Ryzen 5 7640U features Radeon 760M graphics, while the Ryzen 7 7730U has Radeon Graphics (Vega 8). The 7640U’s newer architecture and higher memory bandwidth (89.6 GB/s versus 51.2 GB/s) suggest superior integrated graphics performance, though no specific GPU benchmark scores are provided.

Q: How do their average benchmark scores compare?

A: The Ryzen 7 7730U has an average benchmark score of 25625, while the Ryzen 5 7640U scores 25485. The 7730U is 0.5% ahead of the 7640U in this metric, and both chips sit at the 78th percentile of all CPUs.

Architecture Differences

The two processors come from different generations and design philosophies. The Ryzen 7 7730U is built on Zen 3 architecture, codenamed Barcelo-R, manufactured on TSMC’s 7 nm process. It packs 10,700 million transistors onto a 180 mm² die. In contrast, the Ryzen 5 7640U uses Zen 4 architecture, codenamed Phoenix, on a more advanced 4 nm process, with 25,000 million transistors on a slightly smaller 178 mm² die. The transistor density difference is striking: the 7640U crams more than twice the transistors into a similar physical footprint.

Memory support marks a major generational split. The 7730U uses DDR4 memory with dual-channel configuration and 51.2 GB/s bandwidth, while the 7640U supports DDR5 with 89.6 GB/s bandwidth—a 75% increase in theoretical memory throughput. Both support ECC memory and dual-channel buses, but the newer platform clearly offers headroom for bandwidth-hungry workloads.

Cache hierarchy differs significantly between the two. Both share 64 KB of L1 per core and 16 MB of shared L3, but the L2 cache differs: the 7730U has 512 KB per core, while the 7640U doubles that to 1 MB per core. This means the 7640U’s six cores can hold 6 MB of L2 total versus 4 MB across the 7730U’s eight cores. The larger per-core cache on the 7640U likely contributes to its superior single-thread performance.

PCIe connectivity also reflects the generational gap. The 7730U offers PCIe Gen 3 with 16 lanes (CPU only), while the 7640U provides PCIe Gen 4 with 20 lanes. This affects potential bandwidth for discrete GPUs and NVMe storage. Both use different sockets—FP6 for the 7730U and FP8 for the 7640U—so they are not drop-in interchangeable.

The integrated graphics differ in branding and likely capability. The 7730U carries Radeon Graphics (Vega 8), an older Vega-based design. The 7640U features Radeon 760M, which leverages the newer RDNA architecture. While no direct GPU benchmarks are listed, the 7640U’s combination of newer GPU architecture and higher memory bandwidth points to a clear advantage in graphics tasks.

Clock speeds tell another story of generational improvement. The 7730U has a base clock of 2000 MHz and boost up to 4.50 GHz. The 7640U starts at 3500 MHz base and boosts to 4.90 GHz. Both have a 15 W TDP, but the 7640U achieves significantly higher clocks within the same power envelope, thanks to the efficiency of the 4 nm process.

Head-to-Head Benchmarks

The benchmark data reveals a lopsided contest. The Ryzen 5 7640U wins 15 of 17 comparisons, with the Ryzen 7 7730U taking only two victories. The margin of victory varies wildly by workload.

The 7640U’s single-core dominance is the most dramatic story. In Cinebench R23 single-core, the 7640U scores 2532 versus 1454.5, a 42.6% advantage. Cinebench R15 single-core shows a smaller but still clear 9.4% lead (255 versus 231). Geekbench single-core confirms the trend: 2127 versus 1541, a 27.6% gap. These numbers suggest the Zen 4 architecture delivers a massive IPC improvement over Zen 3, even with two fewer cores.

Multi-core results are more nuanced but still favor the 7640U. The biggest multi-core win comes in Cinebench R23 multi-core, where the 7640U scores 17936 versus 10801.5—a 39.8% lead. This is remarkable given the 7730U has 8 cores versus 6. Geekbench multi-core shows a 23.6% advantage (8595 versus 6565). PassMark multithread gives the 7640U a 14.6% lead (21115 versus 18037). Even in Cinebench R15 multi-core, the 7640U loses by only 1.3% (1807 versus 1830), despite having two fewer cores.

The 7730U’s two wins are narrow. In PassMark integer math, it scores 72352 versus 70483, a 2.7% margin. This is its only clear multi-threaded victory. The other win is in Cinebench R15 multi-core, where it edges out the 7640U by 1.3% (1830 versus 1807). These results suggest that the 7730U’s extra cores help in specific integer-heavy workloads, but the 7640U’s architectural efficiency overcomes the core deficit almost everywhere else.

Heavy math workloads show wide gaps. PassMark physics gives the 7640U a 35.8% lead (1169 versus 751). PassMark find prime numbers shows a 39.2% advantage (74 versus 45). PassMark extended instructions favors the 7640U by 14.1% (17019 versus 14619). Even memory-sensitive tasks like random string sorting show a 19.5% gap (29382 versus 23651) in favor of the 7640U, likely benefiting from DDR5 bandwidth.

Specification Differences

The two processors differ across nearly every major specification category. Here is a concise comparison:

• Cores/Threads: 8/16 (7730U) versus 6/12 (7640U)
• Base Clock: 2000 MHz (7730U) versus 3500 MHz (7640U)
• Boost Clock: 4.50 GHz (7730U) versus 4.90 GHz (7640U)
• Socket: AMD Socket FP6 (7730U) versus AMD Socket FP8 (7640U)
• Architecture: Zen 3 (7730U) versus Zen 4 (7640U)
• Process Node: 7 nm (7730U) versus 4 nm (7640U)
• Transistors: 10,700 million (7730U) versus 25,000 million (7640U)
• Die Size: 180 mm² (7730U) versus 178 mm² (7640U)
• L2 Cache: 512 KB per core (7730U) versus 1 MB per core (7640U)
• Memory Support: DDR4 (7730U) versus DDR5 (7640U)
• Memory Bandwidth: 51.2 GB/s (7730U) versus 89.6 GB/s (7640U)
• PCIe: Gen 3, 16 Lanes (7730U) versus Gen 4, 20 Lanes (7640U)
• Integrated Graphics: Radeon Graphics (Vega 8) (7730U) versus Radeon 760M (7640U)
• Release Date: 2023-01-03 (7730U) versus 2023-05-02 (7640U)

Both share a 15 W TDP, dual-channel memory bus, ECC support, and active production status. Neither has an unlocked multiplier. The 7730U’s part number is 100-000000942, while the 7640U has multiple part numbers (100-000001106(FP7r2), 100-000001109(FP7), 100-000001132(FP8)).

The Verdict

The data paints a clear picture: the AMD Ryzen 5 7640U is the superior processor in nearly every measurable way, despite having two fewer cores. The 7640U wins 15 of 17 benchmarks, with an average delta of roughly 20% across its victories. The only meaningful win for the 7730U is a narrow 2.7% margin in PassMark integer math, plus a 1.3% edge in Cinebench R15 multi-core.

The average benchmark scores are nearly identical—25625 for the 7730U versus 25485 for the 7640U—but this aggregate masks the qualitative difference. The 7640U achieves comparable average scores while winning most individual tests by wide margins, suggesting its performance is more consistently strong. Both sit at the 78th percentile of all CPUs, but the 7640U’s nearest rival list includes the AMD Ryzen 7 7840U (deltaPct 0.2), indicating it competes with higher-tier parts.

For users prioritizing raw multi-threaded throughput in integer-heavy workloads, the 7730U offers a specific niche. Its 8 cores provide a genuine advantage in tasks that scale with core count, as seen in its PassMark integer math win. However, this advantage is narrow and workload-specific.

The 7640U is the better choice for general-purpose computing, single-threaded applications, and any workload that benefits from modern architecture. Its 42.6% lead in Cinebench R23 single-core and 39.8% lead in multi-core demonstrate that Zen 4’s IPC improvements more than compensate for fewer cores. The 89.6 GB/s memory bandwidth versus 51.2 GB/s also suggests better performance in memory-bound scenarios.

Where Each One Wins

The Ryzen 5 7640U is the clear winner for most users. It excels in single-threaded performance, as shown by its 42.6% advantage in Cinebench R23 single-core and 27.6% lead in Geekbench single-core. These results point to snappier everyday responsiveness, faster application launches, and better performance in lightly-threaded tasks.

The 7640U also dominates in creative and professional workloads. Its 39.8% lead in Cinebench R23 multi-core and 23.6% advantage in Geekbench multi-core suggest it handles video rendering, 3D modeling, and code compilation more effectively. The 35.8% win in PassMark physics and 39.2% lead in prime number finding indicate strong floating-point and mathematical capabilities. Data compression and encryption tasks also favor the 7640U, with 6.3% and 4.7% advantages respectively.

The Ryzen 7 7730U’s wins are limited but specific. Its 2.7% advantage in PassMark integer math suggests it handles integer-heavy calculations, such as certain types of data processing or financial modeling, slightly better. The 1.3% lead in Cinebench R15 multi-core shows that in older benchmarks, the extra two cores can provide a marginal edge.

The 7730U also holds the distinction of being the only one of the two with a win in any multi-core test that isn’t integer math, though that win is minimal. For users running software that’s heavily optimized for many cores and doesn’t benefit from newer instructions, the 7730U might be a reasonable pick. However, the data overwhelmingly supports the 7640U for virtually all other scenarios.