AMD Ryzen Threadripper 3960X vs Intel Core i5-8350U Comparison

# Intel Core i5-8350U vs AMD Ryzen Threadripper 3960X

The Intel Core i5-8350U is a 15 W mobile processor designed for thin-and-light laptops, while the AMD Ryzen Threadripper 3960X is a 280 W desktop-class behemoth built for heavy multi-threaded workloads. The benchmark data shows a complete sweep: the Threadripper 3960X wins all six head-to-head comparisons, with the i5-8350U trailing by roughly 89% in every test. This is not a contest of equals—it is a study in how far processor design can diverge for different use cases.

Where Each One Wins

The Intel Core i5-8350U has zero wins in the head-to-head benchmark set. Its advantage lies entirely outside raw performance: it is a mobile part with a 15 W TDP, integrated UHD 620 graphics, and an Intel BGA 1356 socket, making it suitable for compact, battery-powered systems. The data shows its single-core Cinebench R23 score of 730 is functional for everyday tasks, and its Passmark single-thread score of 1996 places it in a range that can handle typical office and web workloads. Its 65th percentile ranking among all CPUs suggests it sits in the upper-middle tier of all processors ever tested, despite its modest core count.

The AMD Ryzen Threadripper 3960X wins every measurable performance category. Its 24 cores and 48 threads, combined with a 4.50 GHz boost clock, deliver a Cinebench R23 multi-core score of 46557—roughly nine times the i5-8350U's 5173. It also dominates in single-core tests, scoring 6572 in Cinebench R23 single-core versus the Intel's 730, demonstrating that its architectural efficiency is not solely dependent on core count. The Threadripper's 3DMark results further illustrate its scaling: it scores 9989 with 16 threads, 5267 with 8 threads, and 13978 with maximum threads, showing strong scaling as more cores are utilized. This makes it a clear choice for rendering, simulation, and content creation where multi-threaded performance is paramount.

Architecture Differences

The two processors represent fundamentally different design philosophies separated by two years of development. The i5-8350U uses Intel's Kaby Lake-R architecture on a 14 nm process node, with a 123 mm² die size and no listed transistor count. It packs 4 cores and 8 threads, with a base clock of 1.70 GHz and a boost clock of 3.60 GHz. Its cache hierarchy includes 64 KB of L1 per core, 256 KB of L2 per core, and 6 MB of shared L3 cache. Memory support is DDR4, and it lacks ECC support. The integrated UHD 620 graphics make it a complete system-on-chip for mobile devices.

The Threadripper 3960X, by contrast, uses AMD's Zen 2 architecture on a 7 nm process from TSMC, with a massive 15,200 million transistors spread across four 74 mm² chiplets (4x 74 mm²). It has 24 cores and 48 threads, with a base clock of 3.80 GHz and a boost clock of 4.50 GHz. Its cache configuration is more generous: 64 KB L1 per core, 512 KB L2 per core, and a substantial 128 MB of L3 cache. It supports DDR4 memory through a quad-channel bus with 102.4 GB/s of bandwidth, and it features PCIe Gen 4 connectivity. The multiplier is unlocked, allowing overclocking, and it has no integrated graphics, relying on a discrete GPU.

The process node difference is significant: 14 nm versus 7 nm, which contributes to the Threadripper's ability to pack six times the cores while maintaining higher clocks. The i5-8350U's 15 W TDP is a constraint that forces low clocks, while the Threadripper's 280 W TDP allows aggressive boosting. The cache difference is stark: 6 MB shared L3 on Intel versus 128 MB on AMD, which aids in feeding 48 threads. The Threadripper also benefits from PCIe Gen 4, while the i5-8350U has no listed PCIe specification, reflecting its mobile focus where expansion is limited.

Head-to-Head Benchmarks

The head-to-head data is unambiguous. In Cinebench R15 multi-core, the Threadripper scores 4692 against the i5-8350U's 521, a delta of -88.9% for Intel. The single-core R15 test shows 662 versus 73, again -89%. Cinebench R20 multi-core gives 19553 versus 2172 (-88.9%), while single-core is 2760 versus 306 (-88.9%). Cinebench R23 multi-core shows 46557 versus 5173 (-88.9%), and single-core is 6572 versus 730 (-88.9%).

The consistency of the ~89% deficit across all six tests is remarkable. It suggests that the performance gap is not workload-dependent; the Threadripper is uniformly faster in both single-threaded and multi-threaded scenarios. The single-core results are particularly telling: despite a lower boost clock (4.50 GHz vs 3.60 GHz), the Threadripper's Zen 2 architecture delivers about nine times the single-core performance of the i5-8350U. This implies that the i5-8350U's low base clock of 1.70 GHz and its 15 W power envelope severely limit its ability to sustain high frequencies, even for short bursts. The Threadripper's 3.80 GHz base clock is more than double the Intel's base, and its boost is 25% higher in raw terms, but the ninefold performance difference in single-core tests indicates architectural efficiency differences beyond clock speed.

The multi-core results magnify the core-count advantage: 24 cores with SMT (48 threads) versus 4 cores with SMT (8 threads) is a 6x thread advantage, but the actual multi-core score gap is about 9x, meaning the Threadripper also extracts more performance per thread. This is likely due to the larger L3 cache (128 MB vs 6 MB) and higher memory bandwidth (102.4 GB/s vs unspecified on Intel), which reduce stalls and improve data throughput.

FAQ

Q: Which processor has a higher multi-core performance?

A: The AMD Ryzen Threadripper 3960X, with a Cinebench R23 multi-core score of 46557, is 88.9% ahead of the Intel Core i5-8350U's score of 5173.

Q: Does the Intel i5-8350U win in any benchmark category?

A: No. The head-to-head data shows zero wins for the i5-8350U across all six Cinebench tests, with the Threadripper winning every comparison.

Q: How do their power requirements compare?

A: The i5-8350U has a 15 W TDP, designed for mobile use, while the Threadripper 3960X has a 280 W TDP, reflecting its desktop performance focus.

Q: What is the difference in core and thread counts?

A: The i5-8350U has 4 cores and 8 threads, while the Threadripper 3960X has 24 cores and 48 threads.

Q: Which processor supports faster memory bandwidth?

A: The Threadripper 3960X supports quad-channel DDR4 with 102.4 GB/s bandwidth; the i5-8350U lists DDR4 support but does not specify bandwidth.

Q: Are both processors currently in production?

A: Yes, both the Intel Core i5-8350U and the AMD Ryzen Threadripper 3960X are listed as "Active" in production status.

The Verdict

The data points overwhelmingly toward the AMD Ryzen Threadripper 3960X for any user prioritizing raw performance. Its 24 cores, 48 threads, and 128 MB of L3 cache deliver nine times the multi-core score of the i5-8350U in Cinebench R23, and even in single-core tests it is roughly nine times faster. The Threadripper's 65th percentile ranking among all CPUs, with an average benchmark score of 9284, places it in the same percentile as the i5-8350U (also 65th), but its nearest rivals include the Intel Xeon Platinum 8280M (avg score 9260) and Intel Core i5-10300H (avg score 9243), showing it competes with high-end server and desktop parts.

The Intel Core i5-8350U is for a different audience entirely. Its 15 W TDP allows for fanless or low-noise designs in laptops, and its integrated UHD 620 graphics eliminate the need for a discrete GPU. Its average benchmark score of 8998 is only 3% lower than the Threadripper's 9284, but this average includes a different set of tests (Passmark workloads) that favor its lighter load profile. The i5-8350U's nearest rivals include the Intel Core i5-1135G7 (avg score 9053, delta -0.6%) and the Intel Core i7-8650U (avg score 8932, delta 0.7%), indicating it is competitively positioned within its mobile segment.

For a desktop workstation or content-creation rig, the Threadripper 3960X is the clear choice, especially given its unlocked multiplier for overclocking and PCIe Gen 4 support. For a portable ultrabook, the i5-8350U's low power draw and integrated graphics are its key strengths. The data does not suggest these are interchangeable; they serve separate markets with distinct priorities.

Specification Differences

| Specification | Intel Core i5-8350U | AMD Ryzen Threadripper 3960X |

|----------------|---------------------|------------------------------|

| Cores | 4 | 24 |

| Threads | 8 | 48 |

| Base Clock | 1.70 GHz | 3.80 GHz |

| Boost Clock | 3.60 GHz | 4.50 GHz |

| TDP | 15 W | 280 W |

| Socket | Intel BGA 1356 | AMD Socket TRX4 |

| Architecture | Kaby Lake-R | Zen 2 (Castle Peak) |

| Process Node | 14 nm | 7 nm |

| Foundry | Intel | TSMC |

| Transistors | Not listed | 15,200 million |

| Die Size | 123 mm² | 4x 74 mm² |

| L1 Cache | 64 KB (per core) | 64 KB (per core) |

| L2 Cache | 256 KB (per core) | 512 KB (per core) |

| L3 Cache | 6 MB (shared) | 128 MB |

| Memory Bus | Not listed | Quad-channel |

| Memory Bandwidth | Not listed | 102.4 GB/s |

| PCIe | Not listed | Gen 4 |

| Integrated Graphics | UHD 620 | None |

| Market Segment | Mobile | Desktop |

| Release Date | 2017-08-20 | 2019-11-24 |

| Launch MSRP | Not listed | $1399 |

| Multiplier Unlocked | No | Yes |

| Part Number | SR3L9 | 100-000000010100-100000010WOF |