AMD Ryzen 5 7640U vs AMD Ryzen 5 PRO 5655GE Comparison

The recorded data paints an unusually one-sided picture: the AMD Ryzen 5 7640U wins every single head-to-head benchmark against the AMD Ryzen 5 PRO 5655GE, all 17 of them, despite being a mobile part with a far lower thermal envelope. The Ryzen 5 PRO 5655GE holds its own in aggregate terms, sitting in the 78th percentile of all CPUs in the database, but in a direct matchup the newer Zen 4 silicon sweeps the board. The interesting question is not who wins, since the data answers that decisively, but by how much, and where the gap narrows enough to matter for a build decision.

Head-to-Head Benchmarks

Start with the Cinebench suite, where the margin is remarkably consistent. The Ryzen 5 7640U scores 1807 in Cinebench R15 multi-core against 1562 for the 5655GE, a 13.6 percent lead. Cinebench R15 single-core goes the same way: 255 versus 220, a 13.7 percent gap. Move to Cinebench R20 and the pattern holds, 7533 versus 6511 in multi-core and 1063 versus 918 in single-core, both a 13.6 percent advantage for the 7640U. Cinebench R23 repeats it exactly: 17936 versus 15504 in multi-core and 2532 versus 2188 in single-core, again 13.6 percent apart. That consistency across three Cinebench generations tells you the lead is architectural, not a quirk of one test.

Passmark tells a more nuanced story. In Passmark multi-thread the 7640U leads 21115 to 18057, a 14.5 percent win, and single-thread goes 3524 to 3240, an 8.1 percent edge. But some individual subtests tighten considerably. Integer math is nearly a wash: 70483 versus 67582, only 4.1 percent apart. Encryption is closer still, 14954 versus 14509, a 3 percent gap. Floating point math lands at 41093 versus 38204, 7 percent in favor of the 7640U. Data compression sits in between at 240032 versus 228037, 5 percent apart.

Then there are the blowouts. Passmark physics is the single largest gap in the dataset: 1169 for the 7640U versus 648 for the 5655GE, a 44.6 percent difference. Prime number finding is nearly as dramatic, 74 versus 49, a 33.8 percent lead. Random string sorting goes 29382 to 23769, 19.1 percent in favor of the 7640U. Extended instructions land at 17019 versus 15714, 7.7 percent apart.

Geekbench results exist only for the 7640U in this dataset, 8595 multi-core and 2127 single-core, so no direct comparison is possible there. For context on aggregate standing, the 5655GE's average benchmark score of 25880 places it within a fraction of a percent of rivals like the Intel Core i7-11700K (25812, a 0.3 percent gap) and the AMD Ryzen AI 5 340 (25981, 0.4 percent behind). The 7640U's average of 25485 puts it alongside the AMD Ryzen 7 7840U (25432, 0.2 percent apart) and the Intel Xeon D-2752TER (25530, 0.2 percent behind). Both chips occupy the same 78th percentile against the full database.

Architecture Differences

The core counts and thread counts are identical: six cores and twelve threads each. Everything else diverges. The 5655GE is a Zen 3 design, codename Cezanne, built on TSMC's 7 nm process with 10,700 million transistors on a 180 mm² die. The 7640U is Zen 4, codename Phoenix, on TSMC's 4 nm node, packing 25,000 million transistors into a nearly identical 178 mm² die. That is more than double the transistor count on a denser node, and it shows up directly in the clock figures: a 4.90 GHz boost on the 7640U against 4.40 GHz on the 5655GE, with base clocks of 3.50 GHz versus 3.40 GHz.

Cache also favors the newer chip. Both carry 64 KB of L1 per core and 16 MB of L3, but the 7640U doubles L2 to 1 MB per core versus 512 KB per core on the 5655GE. Platform connectivity is another clear split. The 7640U supports PCIe Gen 4 with 20 CPU lanes and DDR5 memory with 89.6 GB/s of bandwidth; the 5655GE is limited to PCIe Gen 3 with 16 CPU lanes and DDR4 at 51.2 GB/s. Both support dual-channel memory and ECC.

The design targets differ fundamentally. The 5655GE is a desktop part on Socket AM4 with a 65 W TDP. The 7640U is a mobile part on Socket FP8 rated at 15 W. The integrated graphics differ too: Radeon 760M on the 7640U versus Radeon Vega 7 on the 5655GE. Both chips launched roughly a year apart, the 7640U first and the 5655GE later, and both remain in active production. Neither has an unlocked multiplier.

The Verdict

Purely on performance data, the Ryzen 5 7640U is the pick. It wins every recorded benchmark, often by double digits, and delivers that performance within a 15 W envelope versus the 5655GE's 65 W. The 44.6 percent physics lead and 33.8 percent prime-finding lead are the kinds of gaps that change how a machine feels in simulation and compute-heavy tasks.

The 5655GE case rests on platform rather than speed. It is the only one of the two that fits a desktop Socket AM4 board, and for organizations already standardized on DDR4 and AM4 infrastructure, its aggregate score of 25880 keeps it competitive with chips like the Intel Core i7-14701TE (26013, just 0.5 percent ahead) and the AMD Ryzen 5 230 (25782, 0.4 percent behind). The PRO branding also implies manageability features matter in business deployments. But if the decision is performance per watt or raw benchmark output, the data points one direction only.

Specification Differences

• Architecture: Zen 3 (Cezanne) on the 5655GE versus Zen 4 (Phoenix) on the 7640U
• Process node: 7 nm versus 4 nm, both TSMC
• Transistors: 10,700 million versus 25,000 million
• Die size: 180 mm² versus 178 mm²
• Base clock: 3.40 GHz versus 3.50 GHz
• Boost clock: 4.40 GHz versus 4.90 GHz
• TDP: 65 W versus 15 W
• Socket: AMD Socket AM4 versus AMD Socket FP8
• L2 cache: 512 KB per core versus 1 MB per core
• Memory: DDR4 at 51.2 GB/s versus DDR5 at 89.6 GB/s
• PCIe: Gen 3 with 16 CPU lanes versus Gen 4 with 20 CPU lanes
• Integrated graphics: Radeon Vega 7 versus Radeon 760M
• Market segment: Desktop versus Mobile
• Release timing: the 7640U arrived first, the 5655GE followed later
• Average benchmark score: 25880 versus 25485

Both share six cores, twelve threads, 64 KB L1 per core, 16 MB of L3, dual-channel memory support, ECC support, an active production status, and a locked multiplier.

FAQ

Q: Does the Ryzen 5 7640U win any benchmarks against the 5655GE?

A: It wins all of them. The head-to-head data records 17 wins for the 7640U and zero for the 5655GE.

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

A: Passmark physics, where the 7640U scores 1169 against 648 for the 5655GE, a 44.6 percent difference.

Q: Where does the 5655GE come closest?

A: Passmark data encryption: 14509 versus 14954, only 3 percent apart. Integer math is also tight at 4.1 percent.

Q: How do their Cinebench R23 results compare?

A: The 7640U scores 17936 multi-core and 2532 single-core, versus 15504 and 2188 for the 5655GE, a 13.6 percent lead in both tests.

Q: Can these two chips go in the same motherboard?

A: No. The 5655GE uses desktop Socket AM4, while the 7640U is a mobile part on Socket FP8.

Q: Do they support the same memory?

A: No. The 5655GE supports DDR4 at 51.2 GB/s bandwidth, while the 7640U supports DDR5 at 89.6 GB/s. Both support ECC.

Where Each One Wins

The 7640U owns every performance use case in the recorded data. Rendering workloads favor it by 13.6 percent across the Cinebench suite. Physics simulation is its strongest territory at 44.6 percent ahead, and integer-heavy prime computation follows at 33.8 percent. String sorting and general multi-threaded throughput favor it at 19.1 percent and 14.5 percent respectively. Single-threaded responsiveness, encryption, compression, integer math, and floating point all tilt its way too, by margins from 3 to 8.1 percent. If the workload is measured by any benchmark in this database, the 7640U is the faster chip.

The 5655GE wins on platform fit rather than measured speed. It is the desktop option, upgradeable and serviceable within the AM4 ecosystem, and its 65 W envelope is standard for that form factor rather than exceptional. Its aggregate score of 25880 actually edges the 7640U's 25485, because it competes in a different mix of recorded tests, and it sits within half a percent of the Intel Core i7-11700K and Intel Core i7-14701TE in overall standing. For AM4 and DDR4 deployments where benchmark leadership is not the priority, it remains a capable option. For everything else, the Zen 4 mobile chip is the data-backed choice.