AMD Ryzen 5 6600U vs Intel Core Ultra 5 135U Comparison

The AMD Ryzen 5 6600U and Intel Core Ultra 5 135U are both 15 W mobile processors aimed at thin-and-light laptops, yet benchmark data reveals they are tuned for different workloads. The AMD chip leans on its Zen 3+ architecture to dominate integer-heavy and encryption tasks, while Intel’s Meteor Lake design counters with raw multi-threaded rendering and floating-point muscle. The data shows a clear split: Intel wins more individual tests (10 of 15 head-to-head comparisons), but AMD’s victories are often decisive in its favored areas, with a 19.8% lead in extended instructions. Both CPUs sit at the 76th percentile among all tested processors, indicating they are evenly matched overall, despite their contrasting strengths.

Where Each One Wins

The Intel Core Ultra 5 135U is the choice for creative and physics-based workloads. Its biggest victory comes in PassMark physics, where it scores 1122 against AMD’s 825, a 26.5% advantage that suggests superior handling of real-time simulation and rigid-body calculations. It also wins floating-point math decisively (41232 vs 33991, a 17.6% lead), which is critical for scientific computing, audio processing, and 3D rendering. In Cinebench, Intel’s multi-core results reinforce this trend: it beats AMD in R15 multi-core (1634 vs 1493) and R23 multi-core (9315 vs 9159.5), though the margins are slimmer. Single-threaded performance also favors Intel, with a 6.3% lead in PassMark single-thread (3343 vs 3132) and a 6.8% edge in Cinebench R23 single-core (1563 vs 1456.5).

The AMD Ryzen 5 6600U wins in data manipulation and security-focused tasks. Its PassMark data encryption score of 12783 tops Intel’s 12195 by 4.8%, making it better suited for VPN workloads and disk encryption. The gap widens in extended instructions (13356 vs 11144, a 19.8% lead), which covers advanced CPU instruction sets like AVX and AES, indicating a hardware advantage for specialized code. AMD also dominates integer math (61723 vs 56864, an 8.5% lead), a key metric for general productivity apps, database queries, and legacy software. Data compression is another AMD win (201364 vs 196712, up 2.4%), relevant for file archiving and backup utilities. Finally, AMD takes Cinebench R15 single-core by 2.2% (233 vs 228), a minor but notable victory in an older rendering test.

The Verdict

For users prioritizing physics simulations, floating-point-heavy tasks like video rendering or scientific analysis, and slightly better single-thread responsiveness, the Intel Core Ultra 5 135U is the stronger pick. Its 26.5% lead in physics and 17.6% edge in floating-point math are the largest performance deltas in this comparison, and it also edges out AMD in most multi-threaded benchmarks, including PassMark multi-thread (17359 vs 17026). Intel’s 10 head-to-head wins versus AMD’s 5 make it the default choice for mixed workloads that lean toward rendering and simulation.

The AMD Ryzen 5 6600U is the better option for security-conscious users or those running integer-intensive enterprise applications. Its 19.8% advantage in extended instructions and 8.5% lead in integer math are not trivial, and they indicate a CPU that handles cryptography, data validation, and legacy code more efficiently. AMD also wins data encryption and compression, making it ideal for always-on encryption or database management. However, its single-core deficit (6.3% behind in PassMark) and multi-thread losses mean it is less versatile for general-purpose use. Choose AMD if your workflow is defined by integer and encryption tasks; choose Intel for everything else.

Head-to-Head Benchmarks

The largest margin in the entire comparison belongs to Intel in PassMark physics, where it scores 1122 versus AMD’s 825, a 26.5% difference. This is a massive gap for two 15 W parts, suggesting Intel’s hybrid core layout handles simulation workloads far better. Similarly, Intel wins floating-point math by 17.6% (41232 vs 33991), a test that stresses FPU pipelines and vector operations. In prime number finding, Intel also prevails (64 vs 51, a 20.3% lead), which measures raw integer sort and branch prediction under load.

AMD’s biggest win is PassMark extended instructions at 19.8% (13356 vs 11144). This test exercises CPU extensions beyond the baseline, and AMD’s lead indicates superior support for advanced instruction sets. Integer math is another strong AMD showing (61723 vs 56864, up 8.5%), and data encryption (12783 vs 12195) adds a 4.8% win. In Cinebench, Intel takes R15 multi-core by 8.6% (1634 vs 1493), but AMD narrows the gap in R23 multi-core to just 1.7% (9159.5 vs 9315). Single-core results are mixed: AMD wins R15 single-core by 2.2% (233 vs 228), while Intel wins R23 single-core by 6.8% (1563 vs 1456.5). PassMark multi-thread favors Intel by only 1.9% (17359 vs 17026), and random string sorting goes to Intel by 1.8% (21620 vs 21241).

FAQ

Q: Which CPU has better multi-core rendering performance?

A: The Intel Core Ultra 5 135U wins in Cinebench R15 multi-core (1634 vs 1493, up 8.6%) and R23 multi-core (9315 vs 9159.5, up 1.7%). It also leads PassMark multi-thread (17359 vs 17026, up 1.9%).

Q: Is the AMD Ryzen 5 6600U better for encryption tasks?

A: Yes. AMD scores 12783 in PassMark data encryption versus Intel’s 12195, a 4.8% advantage. AMD also wins data compression (201364 vs 196712, up 2.4%).

Q: How do the two compare in single-threaded performance?

A: Intel leads in PassMark single-thread (3343 vs 3132, up 6.3%) and Cinebench R23 single-core (1563 vs 1456.5, up 6.8%). AMD wins Cinebench R15 single-core by a narrow 2.2% (233 vs 228).

Q: Which CPU is better for scientific or physics-based workloads?

A: The Intel Core Ultra 5 135U is clearly superior, winning PassMark physics by 26.5% (1122 vs 825) and floating-point math by 17.6% (41232 vs 33991).

Q: What are the core and thread counts for each processor?

A: The AMD Ryzen 5 6600U has 6 cores and 12 threads. The Intel Core Ultra 5 135U has 12 cores and 14 threads.

Q: Do these processors support DDR5 memory?

A: Yes, both support DDR5. AMD offers 76.8 GB/s memory bandwidth, while Intel provides 89.6 GB/s. Both use dual-channel memory buses.

Architecture Differences

The two CPUs come from fundamentally different design philosophies. The AMD Ryzen 5 6600U is built on the Zen 3+ architecture (codenamed Rembrandt) using a 6 nm process from TSMC. It features 6 cores and 12 threads, with a base clock of 2.90 GHz and a boost clock of 4.50 GHz. Its cache layout includes 64 KB of L1 per core, 512 KB of L2 per core, and 16 MB of shared L3. The die size is 208 mm², and it uses the AMD Socket FP7. Integrated graphics are provided by the Radeon 660M.

The Intel Core Ultra 5 135U uses the Meteor Lake architecture on Intel’s 7 nm process. It has 12 cores and 14 threads, with a base clock of 1600 MHz and a boost clock of 4.40 GHz. Cache sizes are larger per core: 112 KB of L1, 2 MB of L2, and 12 MB of shared L3. It uses the Intel BGA 2049 socket and integrates Arc Xe-LPG 64EU graphics. Intel’s memory bandwidth is higher at 89.6 GB/s compared to AMD’s 76.8 GB/s, and the chip launched on December 13, 2023, with a launch MSRP of $332.

Both parts are mobile segments with a 15 W TDP, but they differ in core strategy: AMD uses a uniform 6-core design, while Intel employs a hybrid 12-core setup (likely a mix of performance and efficiency cores) to achieve higher multi-thread scores. AMD offers Gen 4 PCIe with 20 lanes, while Intel provides Gen 4 with 12 lanes. Neither supports ECC memory, and both are production-active parts. The die size for Intel is not listed, but AMD’s 208 mm² die is larger than typical for a 6-core part, reflecting its integrated Radeon graphics.