AMD Ryzen 9 4900H vs Intel Core i5-1245U Comparison

# AMD Ryzen 9 4900H vs Intel Core i5-1245U

The AMD Ryzen 9 4900H and Intel Core i5-1245U represent two distinct philosophies in mobile computing: the former is a high-TDP performance part from AMD's 4000 series, while the latter is a low-power hybrid design from Intel's Alder Lake generation. Benchmark data shows both processors land at the 56th percentile among all CPUs, indicating comparable overall standing despite their architectural differences. The head-to-head results split evenly at two wins apiece, with each chip claiming dominance in different workload types—the Ryzen leading in older Cinebench R15 tests, and the Intel part countering decisively in the modern Cinebench R23 suite.

Where Each One Wins

The AMD Ryzen 9 4900H is the clear winner in multi-threaded workloads that rely on sustained throughput, as evidenced by its 46.5% advantage in Cinebench R15 multicore (1926.5 vs 1315). This margin is substantial—nearly half again as much performance—and reflects the Ryzen's 8-core/16-thread configuration operating at a 54W TDP. The Ryzen also edges out the Intel part in Cinebench R15 single-core, though by a modest 4.3% (193 vs 185), suggesting that in shorter, lighter bursts, the AMD chip retains a slight edge.

The Intel Core i5-1245U wins in the newer Cinebench R23 benchmarks, which are more representative of current software optimization. Its R23 multicore score of 13053 surpasses the Ryzen's 11604 by 11.1%, a significant reversal from the R15 result. Even more striking is the single-core R23 gap: Intel leads 1842 vs 1294, a 29.8% advantage. This indicates that for responsiveness in single-threaded applications, modern productivity tasks, and lightly-threaded creative software, the Intel part is markedly superior. The i5-1245U achieves this with a 15W TDP—just 27.8% of the Ryzen's power envelope—making it the efficiency-focused choice.

Architecture Differences

The two processors are built on fundamentally different architectures. The Ryzen 9 4900H uses AMD's Zen 2 design, codenamed Renoir, fabricated on a 7nm TSMC process with 9,800 million transistors in a 156 mm² die. It offers 8 cores and 16 threads with a base clock of 3.30 GHz and boost clock of 4.40 GHz. Cache configuration includes 64 KB L1 per core, 512 KB L2 per core, and 8 MB shared L3. Memory support covers DDR4 and LPDDR4 over a dual-channel bus with 51.2 GB/s bandwidth, and PCIe is Gen 3. The integrated GPU is Radeon Graphics with 512 SPs.

The Intel Core i5-1245U employs Alder Lake-U architecture, a hybrid design featuring 10 cores and 12 threads. Its base clock is listed at 1600.00 MHz with a 4.40 GHz boost. The process node is Intel's 10nm, with cache comprising 80 KB L1 per core, 1.25 MB L2 per core, and 12 MB shared L3—50% more L3 than the AMD part. Memory support extends to both DDR4 and DDR5 over dual channels, and PCIe is Gen 4 with 20 lanes (CPU only). Integrated graphics are Iris Xe with 80 execution units. The Intel chip operates at 15W TDP compared to the Ryzen's 54W, a 39W difference that explains much of the performance divergence.

The release timing also differs: AMD launched the 4900H in March 2020, while Intel's i5-1245U arrived in February 2022. Both are mobile processors with active production status, neither has an unlocked multiplier, and neither supports ECC memory. The Intel part's hybrid architecture—combining performance and efficiency cores—likely explains its ability to deliver competitive or superior results at dramatically lower power draw.

Head-to-Head Benchmarks

The Cinebench R15 multicore test delivers the largest win for AMD. The Ryzen 9 4900H scores 1926.5 against the i5-1245U's 1315, a 46.5% delta that demonstrates the AMD chip's raw multi-threading capability in older benchmark conditions. This aligns with the Ryzen's higher TDP and 16 threads, which allow it to sustain heavy parallel workloads without thermal throttling.

In Cinebench R15 single-core, AMD wins again but narrowly: 193 vs 185, a 4.3% edge. This small margin suggests that in early-generation Cinebench, the Ryzen's Zen 2 cores held a slight IPC advantage over Intel's Alder Lake efficiency cores, or that the benchmark's lighter load favored the AMD clock behavior.

The tables turn in Cinebench R23 multicore. Intel's i5-1245U scores 13053 versus AMD's 11604, an 11.1% advantage. This is particularly notable given the Intel chip's 15W TDP—achieving higher multi-core throughput than the 54W AMD part indicates substantial architectural efficiency gains in Alder Lake's hybrid design, which can engage all cores effectively while managing power.

The single-core R23 result is the most lopsided. Intel leads 1842 vs 1294, a 29.8% margin. This massive delta points to significant IPC improvements in Intel's performance cores, likely driven by the newer architecture and higher boost behavior. For users running single-threaded applications—spreadsheets, web browsers, many legacy programs—the Intel chip offers substantially snappier performance.

FAQ

Q: Which processor has more cores?

A: The AMD Ryzen 9 4900H has 8 cores and 16 threads, while the Intel Core i5-1245U has 10 cores and 12 threads. Despite fewer physical cores, the AMD part offers more threads due to simultaneous multithreading on all cores.

Q: How do the TDP ratings compare?

A: The AMD Ryzen 9 4900H has a 54W TDP, while the Intel Core i5-1245U is rated at 15W. This 39W difference is significant for laptop design, thermal management, and battery life, with the Intel part consuming far less power.

Q: Which chip is better for single-core performance?

A: The Intel Core i5-1245U is clearly superior in modern single-core workloads. In Cinebench R23 single-core, it scores 1842 versus the Ryzen's 1294, a 29.8% advantage. Even in the older R15 test, the margin is close but favors AMD at 4.3%.

Q: Why does AMD win in some multi-core tests but lose in others?

A: The benchmark results show AMD leading in Cinebench R15 multicore by 46.5%, but Intel leading in R23 multicore by 11.1%. This likely reflects different workload characteristics: R15 may favor AMD's higher thread count, while R23's more complex rendering may benefit from Intel's newer architecture and larger 12 MB L3 cache.

Q: What are the process node differences?

A: AMD uses a 7nm TSMC process for the Ryzen 9 4900H, while Intel uses its own 10nm process for the Core i5-1245U. The AMD chip is fabricated with 9,800 million transistors on a 156 mm² die; Intel's transistor count and die size are not listed.

Q: Do both processors support DDR5 memory?

A: No. The AMD Ryzen 9 4900H supports only DDR4 and LPDDR4, while the Intel Core i5-1245U supports both DDR4 and DDR5. The Intel chip also features PCIe Gen 4 with 20 lanes, whereas AMD uses PCIe Gen 3.

The Verdict

The data presents a nuanced picture. The AMD Ryzen 9 4900H is the stronger choice for legacy multi-threaded workloads, delivering a 46.5% advantage in Cinebench R15 multicore and a 4.3% edge in R15 single-core. It also offers 16 threads, which can benefit heavily parallel tasks that scale well with thread count. However, its 54W TDP makes it suitable primarily for larger laptops with robust cooling.

The Intel Core i5-1245U is the better option for modern performance, especially single-threaded responsiveness, where it leads by 29.8% in R23 single-core and 11.1% in R23 multicore. Its 15W TDP makes it far more suitable for thin-and-light laptops, and its support for DDR5 and PCIe Gen 4 provides a more current platform foundation. The larger 12 MB L3 cache likely contributes to its strong R23 results.

For users prioritizing raw multi-threading in older software and are willing to accept higher power consumption, the Ryzen 9 4900H is the data-backed pick. For those seeking better modern-day performance, superior efficiency, and a more future-proof feature set, the Core i5-1245U is the clear recommendation. Both processors sit at the same 56th percentile overall, but they achieve that standing through very different strengths—one through brute thread count, the other through architectural efficiency.