AMD Ryzen 7 PRO 5755G vs AMD Ryzen 9 3900 Comparison

The Verdict

The data presents a clear split: the AMD Ryzen 9 3900 dominates the AMD Ryzen 7 PRO 5755G in nearly every multithreaded workload, while the Ryzen 7 PRO 5755G claims a decisive victory in single-thread performance. With 9 benchmark wins against 2 for the Ryzen 7 PRO 5755G, the Ryzen 9 3900 is the stronger overall processor for heavily threaded tasks, content creation, and data processing. The Ryzen 7 PRO 5755G, however, is the better choice for workloads that rely on per-core speed, such as legacy single-threaded applications, lightly threaded games, and responsiveness-sensitive tasks. The Ryzen 9 3900 also offers a larger L3 cache and PCIe Gen 4 support, while the Ryzen 7 PRO 5755G counters with a more modern Zen 3 architecture and an integrated Radeon Vega 8 GPU. Neither chip is a universal winner; the choice depends entirely on whether the workload favors core count or single-thread efficiency.

Architecture Differences

The two processors come from different generations of AMD's Ryzen line. The Ryzen 7 PRO 5755G belongs to the 5000 series, built on the Zen 3 architecture with the Cezanne codename. The Ryzen 9 3900 is part of the 3000 series, using the older Zen 2 architecture with the Matisse codename. Both are manufactured on a 7 nm process at TSMC, but the transistor counts tell different stories: the Ryzen 7 PRO 5755G integrates 10,700 million transistors on a 180 mm² die, while the Ryzen 9 3900 uses 7,600 million transistors spread across two dies of 74 mm² each. This explains why the Ryzen 9 3900 has a chiplet design, whereas the Ryzen 7 PRO 5755G is a monolithic die.

Core counts differ significantly. The Ryzen 9 3900 features 12 cores and 24 threads, while the Ryzen 7 PRO 5755G has 8 cores and 16 threads. Base clocks also diverge: the Ryzen 7 PRO 5755G runs at 3.80 GHz base and 4.60 GHz boost, while the Ryzen 9 3900 operates at 3.10 GHz base and 4.30 GHz boost. Both processors have a 65 W TDP, but the Ryzen 9 3900's higher core count means it spreads that power budget across more cores, resulting in lower clocks.

Cache configurations differ substantially. The Ryzen 7 PRO 5755G has 64 KB of L1 per core, 512 KB of L2 per core, and 16 MB of L3 cache. The Ryzen 9 3900 matches the L1 and L2 per-core allocation but provides 64 MB of L3 cache, four times the Ryzen 7 PRO 5755G's total. This larger cache is a major factor in the Ryzen 9 3900's multithreaded performance, as more data can be held closer to the cores.

Memory support is identical in type and bandwidth: both use DDR4 with a dual-channel bus and 51.2 GB/s theoretical bandwidth. Neither supports ECC memory. The PCIe interface differs, though: the Ryzen 7 PRO 5755G provides PCIe Gen 3 with 16 lanes (CPU only), while the Ryzen 9 3900 offers PCIe Gen 4 with 24 lanes (CPU only). This gives the Ryzen 9 3900 a notable advantage for storage and GPU bandwidth in systems that can utilize PCIe Gen 4.

The Ryzen 7 PRO 5755G includes an integrated Radeon Vega 8 GPU, while the Ryzen 9 3900 has no integrated graphics. This makes the Ryzen 7 PRO 5755G a viable option for systems without a discrete GPU, though the database does not record any graphics benchmarks. The Ryzen 9 3900 has an unlocked multiplier, while the Ryzen 7 PRO 5755G's multiplier is locked. The Ryzen 9 3900 launched with a $499 MSRP, while the Ryzen 7 PRO 5755G has no recorded launch price. The Ryzen 9 3900 was released in 2019, while the Ryzen 7 PRO 5755G came much later, in 2024.

Head-to-Head Benchmarks

The most dramatic difference appears in the PassMark find prime numbers test. The Ryzen 9 3900 scores 203, while the Ryzen 7 PRO 5755G manages only 58, a 71.4% deficit for the newer chip. This test likely stresses integer-heavy, cache-sensitive operations, where the Ryzen 9 3900's 64 MB L3 cache and 12 cores provide a massive advantage.

Physics performance also favors the Ryzen 9 3900 heavily. The Ryzen 9 3900 scores 1617, while the Ryzen 7 PRO 5755G scores 1022, a 36.8% difference. This is likely a multithreaded physics simulation, where core count and cache size dominate.

Data compression shows a 28.5% lead for the Ryzen 9 3900, with scores of 413887 versus 295730. Data encryption follows a similar pattern: the Ryzen 9 3900 scores 26657, the Ryzen 7 PRO 5755G scores 19450, a 27% gap. Random string sorting also produces a 27% advantage for the Ryzen 9 3900 (44902 versus 32771). Extended instructions show a 21.4% lead for the Ryzen 9 3900 (26073 versus 20487).

The multithread benchmark gives the Ryzen 9 3900 a 22% edge, with scores of 30586 versus 23858. Floating point math is closer: the Ryzen 9 3900 scores 56730, the Ryzen 7 PRO 5755G scores 50778, a 10.5% difference. Integer math shows the smallest multithreaded gap, with the Ryzen 9 3900 at 97698 and the Ryzen 7 PRO 5755G at 90270, a 7.6% lead.

The single-thread tests tell the opposite story. The Ryzen 7 PRO 5755G scores 3366 in both PassMark single-thread and single-thread variants, while the Ryzen 9 3900 scores 2604. This gives the Ryzen 7 PRO 5755G a 29.3% advantage in single-thread performance, a substantial margin that reflects its higher boost clock and newer Zen 3 architecture.

The overall average benchmark scores place the Ryzen 7 PRO 5755G at 49196 and the Ryzen 9 3900 at 47918. Both rank in the 90th percentile against all CPUs. The Ryzen 7 PRO 5755G's nearest rival is the AMD Ryzen 9 7900, with an average score of 49228, just 0.1% ahead. The Ryzen 9 3900's nearest rival is the AMD Ryzen 9 7900X3D, with an average score of 47908, essentially tied at a 0% delta.

FAQ

Q: Which processor has better single-thread performance?

A: The AMD Ryzen 7 PRO 5755G. It scores 3366 in PassMark single-thread tests, compared to 2604 for the AMD Ryzen 9 3900, a 29.3% advantage.

Q: Which processor has better multithread performance?

A: The AMD Ryzen 9 3900. It scores 30586 in PassMark multithread, versus 23858 for the Ryzen 7 PRO 5755G, a 22% lead. The Ryzen 9 3900 also wins the physics test 1617 to 1022.

Q: Does the Ryzen 9 3900 have integrated graphics?

A: No. The Ryzen 9 3900 has no integrated graphics, while the Ryzen 7 PRO 5755G includes a Radeon Vega 8 GPU.

Q: What is the difference in L3 cache size?

A: The Ryzen 9 3900 has 64 MB of L3 cache, while the Ryzen 7 PRO 5755G has 16 MB. This fourfold difference contributes to the Ryzen 9 3900's strong showing in cache-sensitive workloads.

Q: Do both processors support PCIe Gen 4?

A: No. The Ryzen 9 3900 supports PCIe Gen 4 with 24 lanes (CPU only), while the Ryzen 7 PRO 5755G is limited to PCIe Gen 3 with 16 lanes (CPU only).

Q: Are both processors on the same manufacturing process?

A: Yes, both are built on a 7 nm process at TSMC. However, the Ryzen 7 PRO 5755G uses a single 180 mm² die with 10,700 million transistors, while the Ryzen 9 3900 uses two 74 mm² dies with 7,600 million transistors total.

Where Each One Wins

The AMD Ryzen 9 3900 is the clear winner for multithreaded and cache-intensive workloads. Its 12 cores and 24 threads give it a natural advantage in tasks that scale with core count, such as video rendering, scientific computing, batch data processing, and virtualization. The 64 MB L3 cache provides a significant boost in workloads where data sets fit within that cache, as evidenced by the 71.4% lead in the prime numbers test and the 36.8% lead in physics. The Ryzen 9 3900 also wins in data compression, encryption, extended instructions, random string sorting, floating point math, and integer math. For any user running heavily threaded applications, the Ryzen 9 3900's benchmark record is unambiguous.

The AMD Ryzen 7 PRO 5755G wins in single-thread performance, with a 29.3% advantage. This makes it the better choice for workloads that are latency-sensitive or depend on per-core speed, such as legacy software that uses only one or two threads, older games that do not scale well across many cores, and interactive applications where response time matters. The Ryzen 7 PRO 5755G also offers an integrated Radeon Vega 8 GPU, which is a critical feature for systems without a discrete graphics card. The newer Zen 3 architecture and higher boost clock (4.60 GHz versus 4.30 GHz) contribute to its single-thread dominance.

The Ryzen 9 3900's unlocked multiplier is an advantage for enthusiasts who plan to overclock, while the Ryzen 7 PRO 5755G's locked multiplier limits such flexibility. The Ryzen 9 3900's PCIe Gen 4 support with 24 lanes is also a win for users with PCIe Gen 4 SSDs or GPUs, while the Ryzen 7 PRO 5755G is limited to PCIe Gen 3.

Specification Differences

• Cores: Ryzen 7 PRO 5755G has 8, Ryzen 9 3900 has 12.
• Threads: Ryzen 7 PRO 5755G has 16, Ryzen 9 3900 has 24.
• Base Clock: Ryzen 7 PRO 5755G is 3.80 GHz, Ryzen 9 3900 is 3.10 GHz.
• Boost Clock: Ryzen 7 PRO 5755G is 4.60 GHz, Ryzen 9 3900 is 4.30 GHz.
• Architecture: Ryzen 7 PRO 5755G is Zen 3 (Cezanne), Ryzen 9 3900 is Zen 2 (Matisse).
• Transistors: Ryzen 7 PRO 5755G has 10,700 million, Ryzen 9 3900 has 7,600 million.
• Die Size: Ryzen 7 PRO 5755G is 180 mm², Ryzen 9 3900 is 2x 74 mm².
• L3 Cache: Ryzen 7 PRO 5755G has 16 MB, Ryzen 9 3900 has 64 MB.
• PCIe: Ryzen 7 PRO 5755G is Gen 3 with 16 lanes, Ryzen 9 3900 is Gen 4 with 24 lanes.
• Integrated Graphics: Ryzen 7 PRO 5755G has Radeon Vega 8, Ryzen 9 3900 has none.
• Multiplier Unlocked: Ryzen 7 PRO 5755G is locked, Ryzen 9 3900 is unlocked.
• Launch MSRP: Ryzen 9 3900 was $499, Ryzen 7 PRO 5755G has no recorded launch MSRP.
• Release Date: Ryzen 7 PRO 5755G released in 2024, Ryzen 9 3900 released in 2019.
• Part Number: Ryzen 7 PRO 5755G is 100-000001748, Ryzen 9 3900 is 100-000000070.

Both processors share the same TDP (65 W), socket (AMD Socket AM4), memory type (DDR4), memory bus (dual-channel), memory bandwidth (51.2 GB/s), and ECC support (false for both). The Ryzen 7 PRO 5755G's average benchmark score of 49196 is slightly higher than the Ryzen 9 3900's 47918, and both sit in the 90th percentile of all CPUs. The Ryzen 7 PRO 5755G wins 2 of 11 head-to-head benchmarks, while the Ryzen 9 3900 wins 9.