AMD Ryzen 5 7640U vs AMD Ryzen AI 5 340 Comparison

Where Each One Wins

The benchmark data splits these two mobile processors into distinct usage profiles. The AMD Ryzen AI 5 340 claims victory in 5 of the 17 recorded head-to-head tests, while the AMD Ryzen 5 7640U takes 12. That raw count, however, flatters the older chip in ways that matter for specific workloads. The Ryzen AI 5 340 wins in Geekbench multicore (9165 vs 8595, a 6.6% margin) and Geekbench singlecore (2140 vs 2127, a slim 0.6% edge), plus PassMark single-thread (3683 vs 3524, a 4.5% gain) and Cinebench R15 multicore (1915 vs 1807, a 6% advantage). Those are the tests that reflect modern application responsiveness, particularly short-burst single-threaded tasks and general productivity loads.

The Ryzen 5 7640U, conversely, dominates the longer sustained workloads. Its Cinebench R23 multicore score of 17936 crushes the Ryzen AI 5 340's 12532, a staggering 30.1% deficit for the newer part. The 7640U also wins every PassMark computational test except single-thread: integer math (70483 vs 63078, 10.5% ahead), data encryption (14954 vs 11470, 23.3% ahead), floating-point math (41093 vs 39967, 2.7% ahead), and random string sorting (29382 vs 24970, 15% ahead). For users who run long compilation jobs, video encoding, or heavy spreadsheet recalculations, the 7640U is clearly the stronger choice. The Ryzen AI 5 340, meanwhile, positions itself for lighter, more interactive workloads where its single-thread efficiency and lower power envelope shine.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 5 7640U boosts to 4.90 GHz, while the AMD Ryzen AI 5 340 reaches 4.80 GHz. The 7640U also has a higher base clock at 3.50 GHz versus 2.00 GHz for the Ryzen AI 5 340.

Q: Does the Ryzen AI 5 340 beat the 7640U in any multicore test?

A: Yes. The Ryzen AI 5 340 wins Cinebench R15 multicore (1915 vs 1807, 6% ahead) and Geekbench multicore (9165 vs 8595, 6.6% ahead). However, in Cinebench R23 multicore, the 7640U leads by a massive 30.1% (17936 vs 12532).

Q: Which chip has more L3 cache?

A: The AMD Ryzen 5 7640U has 16 MB of shared L3 cache, while the AMD Ryzen AI 5 340 has only 8 MB. Both have 6 cores and 12 threads.

Q: Are both processors built on the same manufacturing process?

A: Yes, both use TSMC's 4 nm process node. However, the Ryzen AI 5 340 is based on Zen 5 architecture (codenamed Krackan Point), while the 7640U uses Zen 4 (codenamed Phoenix).

Q: Which integrated GPU is more capable?

A: The Ryzen 5 7640U features the Radeon 760M, while the Ryzen AI 5 340 has the Radeon 840M. The database records no direct GPU benchmark comparisons for these two, so relative graphics performance cannot be quantified here.

Q: Does the Ryzen AI 5 340 support ECC memory?

A: No. The Ryzen AI 5 340 does not support ECC memory. The Ryzen 5 7640U does support ECC, a distinction that matters for certain professional or server-adjacent workloads.

Head-to-Head Benchmarks

The largest single victory belongs to the Ryzen 5 7640U in Cinebench R23 multicore. Its 17936 score against the Ryzen AI 5 340's 12532 represents a 30.1% gap, the widest delta in the entire comparison. This is a sustained, multi-threaded test, and the 7640U's higher base clock (3.50 GHz vs 2.00 GHz) plus doubled L3 cache (16 MB vs 8 MB) clearly pays dividends. The single-core Cinebench R23 result tells a similar story: 2532 for the 7640U versus 1915.5 for the Ryzen AI 5 340, a 24.3% lead. These two tests alone establish the 7640U as the dominant raw compute chip.

The Ryzen AI 5 340's counterattacks are smaller but meaningful. Its Geekbench multicore win (9165 vs 8595, 6.6%) and Cinebench R15 multicore win (1915 vs 1807, 6%) suggest that in shorter, less thermally demanding workloads, the Zen 5 architecture can outperform the older Zen 4 part despite lower clocks. The PassMark single-thread result (3683 vs 3524, 4.5%) reinforces this: for quick, single-threaded operations, the Ryzen AI 5 340 is the faster chip. In data encryption, the 7640U is decisively ahead (14954 vs 11470, 23.3%), a test that often leverages AES-NI and memory throughput, where the 7640U's larger L3 helps. Random string sorting also favors the 7640U by 15% (29382 vs 24970), indicating stronger memory subsystem behavior under pointer-chasing loads.

The intermediate margins tell a more nuanced story. PassMark integer math shows the 7640U ahead by 10.5% (70483 vs 63078), while floating-point math is nearly tied (41093 vs 39967, a 2.7% gap). Data compression favors the 7640U by 4.3% (240032 vs 229796), and extended instructions by 3.4% (17019 vs 16440). Physics simulation (1169 vs 1095, 6.3% for the 7640U) and prime number finding (74 vs 72, 2.7%) both go to the older chip. The Ryzen AI 5 340's wins are concentrated in tests that penalize thermal throttling or reward architectural efficiency per clock, while the 7640U excels wherever raw sustained throughput is the metric.

Specification Differences

The two processors share a socket (AMD Socket FP8), core count (6), thread count (12), memory bus width (dual-channel), and memory bandwidth (89.6 GB/s). Both are mobile parts with active production status and locked multipliers. The differences are substantial elsewhere. The Ryzen 5 7640U has a base clock of 3.50 GHz and boost clock of 4.90 GHz, while the Ryzen AI 5 340 sits at 2.00 GHz base and 4.80 GHz boost. The 7640U carries a 15 W TDP, the Ryzen AI 5 340 a 28 W TDP. The Ryzen AI 5 340 uses 16 PCIe Gen 4 lanes (CPU only), whereas the 7640U has 20 PCIe Gen 4 lanes. Memory support differs: the Ryzen AI 5 340 accepts DDR5 and LPDDR5X, while the 7640U officially lists only DDR5. ECC memory is supported on the 7640U but not the Ryzen AI 5 340. The integrated GPU is the Radeon 840M on the Ryzen AI 5 340 versus the Radeon 760M on the 7640U. Release dates also diverge: the Ryzen AI 5 340 launched on January 5, 2025, while the 7640U arrived on May 2, 2023. The die size differs slightly (195 mm² for the Ryzen AI 5 340, 178 mm² for the 7640U), and the 7640U has a documented transistor count of 25,000 million, a figure not recorded for the Ryzen AI 5 340.

Architecture Differences

The Ryzen AI 5 340 is built on Zen 5 architecture under the Krackan Point codename, part of the Ryzen AI 300 generation. The Ryzen 5 7640U uses Zen 4 under the Phoenix codename, part of the 7000 series. Both are fabricated on TSMC's 4 nm process, but they differ in cache layout. The Ryzen AI 5 340 has 80 KB of L1 per core and 1 MB of L2 per core, while the 7640U has 64 KB of L1 per core and 1 MB of L2 per core. The L3 cache is the most dramatic architectural split: 8 MB on the Ryzen AI 5 340 versus 16 MB shared on the 7640U. This doubled L3 cache likely explains the 7640U's strong performance in data-heavy tests like encryption and random string sorting. The Ryzen AI 5 340 compensates with a newer instruction set implementation and higher per-clock efficiency, as evidenced by its single-thread PassMark win despite a lower boost clock. The 7640U also offers more PCIe lanes (20 vs 16) and ECC support, suggesting a broader target market. The Ryzen AI 5 340's higher TDP (28 W vs 15 W) indicates it is designed for slightly larger chassis with better cooling, whereas the 7640U targets thinner, more power-constrained systems. The two chips share the same foundry and process node, so the architectural differences come down to Zen generation, cache hierarchy, and feature set rather than manufacturing improvements.