AMD Ryzen 5 7640HS vs AMD Ryzen 7 7840HS Comparison

The AMD Ryzen 5 7640HS and AMD Ryzen 7 7840HS are both 35 W mobile processors built on the same Zen 4 (Phoenix) architecture and 4 nm TSMC process, but they are positioned differently within the 7000 series. The data shows a clear performance hierarchy: the Ryzen 7 7840HS wins 16 of 17 head-to-head benchmarks, while the Ryzen 5 7640HS secures a single victory in Geekbench single-core. Both CPUs share a 81st percentile ranking among all CPUs, yet their average benchmark scores diverge slightly, with the Ryzen 5 7640HS averaging 30390 and the Ryzen 7 7840HS averaging 29955.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 7 7840HS has 8 cores and 16 threads, while the AMD Ryzen 5 7640HS has 6 cores and 12 threads.

Q: What is the single-core performance difference in Geekbench?

A: The Ryzen 5 7640HS leads in Geekbench single-core with a score of 2093, which is 3.1% ahead of the Ryzen 7 7840HS’s score of 2031.

Q: How large is the multi-core performance gap in Cinebench R23?

A: The Ryzen 7 7840HS scores 15102 in Cinebench R23 multi-core, which is 16.9% higher than the Ryzen 5 7640HS’s 12554.

Q: Do both processors have the same integrated graphics?

A: No. The Ryzen 5 7640HS features the Radeon 760M, while the Ryzen 7 7840HS features the Radeon 780M.

Q: What is the base and boost clock difference?

A: The Ryzen 5 7640HS has a base clock of 4.30 GHz and a boost clock of 5.00 GHz, whereas the Ryzen 7 7840HS has a lower base clock of 3.80 GHz but a higher boost clock of 5.10 GHz.

Q: Which processor has a higher average benchmark score?

A: The Ryzen 5 7640HS has a higher average benchmark score of 30390, compared to the Ryzen 7 7840HS’s 29955, despite the latter winning more individual tests.

Architecture Differences

Both processors are built on the same Zen 4 architecture, codenamed Phoenix, and manufactured on a 4 nm process at TSMC. They share identical transistor counts of 25,000 million and a die size of 178 mm². The cache hierarchy is also the same: 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3 cache. Memory support is identical, with DDR5, dual-channel bus, 89.6 GB/s bandwidth, and ECC capability. PCIe connectivity is also the same at Gen 4 with 20 lanes (CPU only).

The fundamental architectural difference lies in the core configuration. The Ryzen 7 7840HS has 8 cores and 16 threads, while the Ryzen 5 7640HS has 6 cores and 12 threads. This two-core, four-thread difference is the primary driver of multi-threaded performance gaps. Clock speeds also differ: the Ryzen 5 7640HS runs a higher base clock of 4.30 GHz, but the Ryzen 7 7840HS achieves a higher boost clock of 5.10 GHz versus 5.00 GHz. The integrated GPU differs as well, with the Ryzen 5 7640HS using the Radeon 760M and the Ryzen 7 7840HS using the Radeon 780M. Both are locked (multiplier not unlocked) and share the same AMD Socket FP8.

Where Each One Wins

The Ryzen 7 7840HS is the clear winner for multi-threaded workloads. In every multi-core test, it outperforms the Ryzen 5 7640HS by significant margins. This includes Cinebench R15 multi-core (2222.84 vs 1978, an 11% delta), Cinebench R23 multi-core (15102 vs 12554, a 16.9% delta), and Geekbench multi-core (11846 vs 10389, a 12.3% delta). The Ryzen 7’s advantage is even more pronounced in PassMark tests, with a 25.7% lead in integer math and a 24.5% lead in floating-point math. It also wins in data compression (345536 vs 269524, a 22% delta) and encryption (20627 vs 15867, a 23.1% delta). For users running rendering, video encoding, or heavy multitasking, the Ryzen 7 7840HS is the superior choice.

The Ryzen 5 7640HS wins only in Geekbench single-core, with a score of 2093 versus 2031, a 3.1% advantage. This suggests a slight edge in lightly-threaded, short-burst workloads. However, the Ryzen 7 7840HS still wins other single-thread tests, such as Cinebench R23 single-core (1761 vs 1715.5, a 2.6% delta) and PassMark single-thread (3753 vs 3654, a 2.6% delta). Therefore, the Ryzen 5’s single-core win is isolated to one benchmark. In practice, the Ryzen 5 7640HS may be more efficient in scenarios that don’t utilize all cores, but the Ryzen 7 7840HS is generally ahead even in single-threaded tests.

Specification Differences

The following specifications differ between the AMD Ryzen 5 7640HS and AMD Ryzen 7 7840HS:

• Cores: 6 vs 8
• Threads: 12 vs 16
• Base Clock: 4.30 GHz vs 3.80 GHz
• Boost Clock: 5.00 GHz vs 5.10 GHz
• Integrated Graphics: Radeon 760M vs Radeon 780M
• Part Number: 100-000000956(FP7r2)100-000000965(FP7)100-000001130(FP8) vs 100-000000955(FP7r2)100-000000964(FP7)100-000001129(FP8)

All other specifications are identical, including TDP (35 W), socket (AMD Socket FP8), architecture (Zen 4), codename (Phoenix), process node (4 nm), foundry (TSMC), transistors (25,000 million), die size (178 mm²), cache sizes (64 KB L1 per core, 1 MB L2 per core, 16 MB L3 shared), memory support (DDR5, dual-channel, 89.6 GB/s), ECC support, PCIe (Gen 4, 20 lanes), market segment (Mobile), production status (Active), and multiplier lock (unlocked: false).

Head-to-Head Benchmarks

The Ryzen 7 7840HS dominates the head-to-head benchmarks, winning 16 of 17 tests. The largest deltas are in the PassMark suite, where the Ryzen 7 7840HS shows its multi-core strength. In integer math, the Ryzen 7 7840HS scores 98682 against the Ryzen 5 7640HS’s 73284, a 25.7% advantage. Floating-point math shows a similar gap: 59921 vs 45220, a 24.5% delta. Data encryption also favors the Ryzen 7 7840HS significantly, with 20627 vs 15867, a 23.1% lead. These results indicate that the extra two cores provide substantial throughput in parallel compute tasks.

In Cinebench R23 multi-core, the Ryzen 7 7840HS scores 15102, which is 16.9% higher than the Ryzen 5 7640HS’s 12554. The Geekbench multi-core test shows a 12.3% gap, with scores of 11846 and 10389, respectively. Even in PassMark physics, which is less core-bound, the Ryzen 7 7840HS leads by 16.1% (1376 vs 1155). The Ryzen 7 7840HS also wins in data compression (345536 vs 269524, a 22% delta), random string sorting (40364 vs 31654, a 21.6% delta), and extended instructions (25747 vs 20556, a 20.2% delta).

The single-core results are closer. In Cinebench R23 single-core, the Ryzen 7 7840HS leads with 1761 versus 1715.5, a 2.6% delta. PassMark single-thread also shows a 2.6% advantage for the Ryzen 7 7840HS (3753 vs 3654). The Ryzen 5 7640HS only wins in Geekbench single-core, scoring 2093 versus 2031, a 3.1% delta. This single win is notable because it suggests the Ryzen 5 7640HS can edge out its larger sibling in specific single-threaded scenarios, despite having a lower boost clock. However, the overall trend in single-threaded tests favors the Ryzen 7 7840HS, albeit by small margins. The benchmark results indicate that the Ryzen 7 7840HS is the more robust performer across the board, with the Ryzen 5 7640HS offering only a narrow, isolated single-core advantage.