AMD Ryzen 5 PRO 5655GE vs AMD Ryzen 7 7840U Comparison

The AMD Ryzen 5 PRO 5655GE and the AMD Ryzen 7 7840U are two very different interpretations of what an efficient processor should be, separated by architecture, platform, and intended use case. The data shows a clear split in performance dominance, with the desktop-oriented 5655GE taking specific high-frequency workloads while the mobile 7840U asserts its authority across the board in throughput and multi-threaded tasks.

Head-to-Head Benchmarks

The head-to-head results paint a fascinating picture of generational and architectural trade-offs. The most dramatic victory for the AMD Ryzen 5 PRO 5655GE comes in Cinebench R23 single-core, where it scores 2188 against the 7840U's 1677.5, a substantial 30.4% advantage. This is a massive margin and suggests that in short, lightly-threaded bursts, the Zen 3 desktop chip can significantly outpace the Zen 4 mobile part. The 5655GE also wins Cinebench R23 multi-core, posting 15504 versus 12719, a 21.9% lead. This is notable because the 7840U has two more cores and four more threads, yet the 5655GE still manages to pull ahead in this specific render test.

However, the AMD Ryzen 7 7840U dominates the rest of the benchmark suite. In the older Cinebench R15 tests, the 7840U wins both multi-core (1990 vs 1562, a 21.5% gap) and single-core (264 vs 220, a 16.7% gap). This is an interesting inversion, where the newer chip wins the legacy test while losing the more modern R23 version. The 7840U's biggest single win is in PassMark physics, scoring 1256 against the 5655GE's 648, a staggering 48.4% advantage. This indicates a massive difference in simulated physics calculations, likely due to the combination of more cores and newer architecture.

The 7840U continues its sweep through the PassMark suite. It leads in floating point math (51767 vs 38204, a 26.2% gap), integer math (90852 vs 67582, a 25.6% gap), and extended instructions (20432 vs 15714, a 23.1% gap). In multithreaded workloads, the 7840U scores 24782 versus 18057, a 27.1% advantage, reinforcing its core-count superiority. It also wins data compression (288604 vs 228037, a 21% gap) and data encryption (17691 vs 14509, an 18% gap). The 7840U even wins single-threaded PassMark tests, scoring 3565 versus 3240, a 9.1% margin, which stands in stark contrast to its loss in Cinebench R23 single-core. Finally, it wins random string sorting by 29.6% and find prime numbers by 38.7%.

Where Each One Wins

Based on the benchmark results, the AMD Ryzen 7 7840U is the clear winner for heavily parallel, sustained workloads. Its wins in PassMark physics, floating point, integer math, and multithread tests make it the superior choice for video encoding, 3D rendering, software compilation, and scientific computing. The data shows it is also better at data compression and encryption, making it a strong option for database work, file archiving, and security-related tasks. Its consistent performance across nearly every PassMark test suggests it is a more versatile and powerful all-rounder for demanding applications.

The AMD Ryzen 5 PRO 5655GE, despite having fewer cores, has carved out a niche in specific Cinebench R23 workloads. Its 30.4% win in single-core R23 and 21.9% win in multi-core R23 are significant. This suggests that in certain applications that are optimized for the Cinebench R23 instruction set or that rely on very high single-thread clock speeds, the 5655GE can provide unexpectedly strong performance. This could translate to advantages in some legacy software, specific CAD tools, or audio production applications that are heavily dependent on single-core speed. However, its wins are isolated to this one benchmark family, making it less broadly applicable than the 7840U.

Architecture Differences

The two processors are built on fundamentally different foundations. The AMD Ryzen 5 PRO 5655GE is based on the Zen 3 architecture with the Cezanne codename, manufactured on a 7 nm process node by TSMC. It features 6 cores and 12 threads. In contrast, the AMD Ryzen 7 7840U uses the Zen 4 architecture with the Phoenix codename, built on a more advanced 4 nm TSMC process, and packs 8 cores and 16 threads.

The transistor count reflects this architectural leap. The 7840U contains 25,000 million transistors, more than double the 10,700 million in the 5655GE, despite having a slightly smaller die size (178 mm² vs 180 mm²). The cache layouts also differ significantly. While both have 64 KB of L1 cache per core, the L2 cache is doubled in the 7840U to 1 MB per core versus 512 KB per core in the 5655GE. Both have 16 MB of L3 cache, though the 5655GE's is listed without a specific sharing descriptor while the 7840U's is explicitly marked as shared.

The integrated graphics are also from different generations. The 5655GE features a Radeon Vega 7, while the 7840U is equipped with the newer Radeon 780M. This is not just a naming difference; the 780M represents a significant generational leap in integrated graphics performance, though no specific benchmark data is available in this set to quantify the difference.

Specification Differences

The specification sheets reveal two processors designed for entirely different platforms. The most obvious difference is the socket: the 5655GE uses the desktop-oriented AMD Socket AM4, while the 7840U uses the mobile AMD Socket FP8. This reflects their market segments, with the 5655GE being a Desktop part and the 7840U a Mobile part.

Memory support is a major divider. The 5655GE supports DDR4 memory with a dual-channel bus and a maximum bandwidth of 51.2 GB/s. The 7840U, on the other hand, supports the newer DDR5 standard, also with a dual-channel bus, but with a significantly higher bandwidth of 89.6 GB/s. This 75% increase in theoretical memory bandwidth is a major advantage for the 7840U in memory-intensive tasks. Both support ECC memory.

Clock speeds show an interesting trade-off. The 5655GE has a base clock of 3.40 GHz and a boost clock of 4.40 GHz. The 7840U has a lower base clock of 3.30 GHz but a much higher boost clock of 5.10 GHz. This explains the 7840U's single-thread wins in PassMark, but not its Cinebench R23 single-core loss, which remains an anomaly. The 7840U also has a much lower TDP of 28 watts compared to the 5655GE's 65 watts, making it far more power-efficient on paper.

PCIe support also differs. The 5655GE provides PCIe Gen 3 with 16 lanes (CPU only), while the 7840U offers PCIe Gen 4 with 20 lanes (CPU only). This gives the newer chip both a bandwidth and lane-count advantage for connecting high-speed storage and other peripherals. The 5655GE is part of the 5000 series, while the 7840U is part of the 7000 series. The 5655GE has a release date of May 2024, while the 7840U's release date is not recorded in the database. Neither processor has an unlocked multiplier.

FAQ

Q: Which processor is faster in single-core performance?

A: It depends on the benchmark. The AMD Ryzen 5 PRO 5655GE wins Cinebench R23 single-core by a massive 30.4% (2188 vs 1677.5). However, the AMD Ryzen 7 7840U wins the PassMark single-thread test by 9.1% (3565 vs 3240) and Cinebench R15 single-core by 16.7% (264 vs 220).

Q: How do they compare in multi-core performance?

A: The AMD Ryzen 7 7840U is generally faster in multi-core workloads, with an 8-core/16-thread configuration. It leads in PassMark multithread by 27.1% (24782 vs 18057) and Cinebench R15 multi-core by 21.5% (1990 vs 1562). The exception is Cinebench R23 multi-core, where the 5655GE wins by 21.9% (15504 vs 12719).

Q: What are the main architectural differences?

A: The 5655GE uses the Zen 3 architecture on a 7 nm process, while the 7840U uses the newer Zen 4 architecture on a 4 nm process. The 7840U also has more transistors (25,000 million vs 10,700 million) and double the L2 cache per core (1 MB vs 512 KB).

Q: Which processor has better memory support?

A: The AMD Ryzen 7 7840U supports newer DDR5 memory with a bandwidth of 89.6 GB/s, which is significantly higher than the 51.2 GB/s of the DDR4-supporting AMD Ryzen 5 PRO 5655GE.

Q: How do their power requirements differ?

A: The AMD Ryzen 7 7840U has a TDP of 28 watts, which is much lower than the 65-watt TDP of the AMD Ryzen 5 PRO 5655GE. This makes the 7840U a more power-efficient part, especially suited for mobile applications.

Q: What are their market segments and sockets?

A: The AMD Ryzen 5 PRO 5655GE is a desktop processor for the AMD Socket AM4, while the AMD Ryzen 7 7840U is a mobile processor for the AMD Socket FP8.