AMD Ryzen Threadripper 3960X vs Intel Core i5-8365U Comparison

Head-to-Head Benchmarks

The benchmark data presents a stark, one-sided picture. In every single recorded head-to-head test, the AMD Ryzen Threadripper 3960X decisively outperforms the Intel Core i5-8365U. The database records six head-to-head comparisons, and the AMD part wins all six. There are no recorded wins for the Intel mobile chip.

The most dramatic gaps appear in the Cinebench tests, which stress both multi-core and single-core performance. In Cinebench R15 multi-core, the Threadripper scores 4692 against the i5-8365U's 509, a delta of 821.8% in favor of AMD. The single-core R15 test tells a similar story: 662 versus 71, a delta of 832.4%. These are not marginal differences; they represent roughly an order of magnitude in performance.

The pattern holds across newer Cinebench versions. In Cinebench R20 multi-core, the AMD chip scores 19553 versus 2121, a delta of 821.9%. In R20 single-core, it is 2760 versus 299, a delta of 823.1%. Cinebench R23 multi-core shows 46557 versus 5050, a delta of 821.9%, and R23 single-core shows 6572 versus 713, a delta of 821.7%. The consistency of these deltas, all hovering around 822%, suggests that the performance gap is structural and uniform across workloads, not a quirk of any single test.

The data also shows the Threadripper's absolute scores in isolation. Its Cinebench R23 multi-core score of 46557 is exceptionally high, while its R23 single-core score of 6572 indicates that even a single Zen 2 core is far ahead of a single Whiskey Lake core in this benchmark. For the Intel chip, the R23 multi-core score of 5050 is its best recorded result in the head-to-head set, yet it still trails by a massive margin.

The Verdict

The data leaves no ambiguity for most users. The AMD Ryzen Threadripper 3960X is a desktop-class processor with 24 cores and 48 threads, designed for sustained heavy workloads. The Intel Core i5-8365U is a mobile processor with 4 cores and 8 threads, built for low power consumption in laptops. The benchmark results reflect this fundamental divide.

For anyone whose primary metric is raw compute performance, the Threadripper 3960X is the only rational choice. Its scores in every Cinebench test, both single and multi-core, are roughly nine to ten times higher than the i5-8365U's. The data suggests that the Threadripper can complete rendering, compilation, or simulation tasks in a fraction of the time.

However, the i5-8365U is not without its own justification. The database shows that it is a mobile part with a TDP of 15 watts, versus 280 watts for the Threadripper. It is also marked as "End-of-life" in production status, while the Threadripper is "Active." For a user needing a laptop processor that fits in a BGA 1528 socket with integrated graphics, the i5-8365U exists in a different product category entirely. The benchmark comparison is apples-to-oranges, but the data still answers the question: for pure speed, the AMD part wins every recorded test.

The percentile data is interesting here. Both processors sit at the 65th percentile versus all CPUs in the database, despite the massive performance gap. This is because the percentile reflects the average benchmark score across many tests, and the i5-8365U has additional PassMark tests that the Threadripper does not have recorded. The average benchmark score for the Threadripper is 9284, while the i5-8365U averages 8708. So even on average, the AMD part leads, but the percentile ranking is identical due to different test sets.

Where Each One Wins

Based strictly on the recorded data, the AMD Ryzen Threadripper 3960X wins in every category that was measured head-to-head. The six Cinebench tests all favor AMD. There is no recorded test in which the Intel Core i5-8365U outperforms the Threadripper.

That said, the i5-8365U has benchmark results in areas where the Threadripper has no recorded data. The Intel chip has PassMark scores for data compression (76239), data encryption (2006), extended instructions (5074), find prime numbers (19), floating point math (13110), integer math (22021), multithread (5976), physics (422), random string sorting (10256), and single thread (2073). These scores are not compared head-to-head with the Threadripper, so we cannot say the Intel chip wins these categories. They simply exist in the database as standalone measurements.

The realistic interpretation is that the Threadripper 3960X is the winner for any workload that appears in the head-to-head set: all Cinebench R15, R20, and R23 tests. The i5-8365U has no recorded strengths in the comparison. Its strengths lie elsewhere, such as its 15 watt TDP and integrated UHD Graphics 620, which are specification advantages rather than benchmark wins. For a user who needs a low-power mobile chip with integrated graphics, the i5-8365U is the only one of the two that fits that description, but the performance data does not give it any victory.

FAQ

Q: Which processor has the higher single-core score in Cinebench R23?

A: The AMD Ryzen Threadripper 3960X scores 6572, while the Intel Core i5-8365U scores 713. The AMD chip leads by a delta of 821.7%.

Q: How large is the multi-core gap in Cinebench R20?

A: The Threadripper 3960X scores 19553, and the i5-8365U scores 2121. The delta is 821.9% in favor of AMD.

Q: Does the Intel Core i5-8365U win any head-to-head benchmark?

A: No. The database records six head-to-head tests, all Cinebench variants, and the AMD Ryzen Threadripper 3960X wins all six. The Intel chip has zero recorded wins.

Q: Why do both processors share the same 65th percentile ranking?

A: The percentile is based on the average benchmark score across each chip's recorded tests. The Threadripper averages 9284, and the i5-8365U averages 8708, but the different test sets and the distribution of scores result in the same percentile rank.

Q: What is the TDP difference between the two?

A: The AMD Ryzen Threadripper 3960X has a TDP of 280 watts, while the Intel Core i5-8365U has a TDP of 15 watts. This reflects the desktop versus mobile design intent.

Q: Does the Intel chip have integrated graphics?

A: Yes, the i5-8365U includes UHD Graphics 620. The Threadripper 3960X has no integrated graphics recorded in the database.

Architecture Differences

The two processors come from fundamentally different design philosophies. The AMD Ryzen Threadripper 3960X is based on the Zen 2 architecture, with the codename Castle Peak. It is built on a 7 nm process at TSMC, using 15,200 million transistors across a multi-die design with a die size of 4x 74 mm². This is a desktop part on the AMD Socket TRX4, with a base clock of 3.80 GHz and a boost clock of 4.50 GHz.

The Intel Core i5-8365U uses the Whiskey Lake architecture, specifically the Whiskey Lake-U codename. It is built on a 14 nm process at Intel, with no transistor or die size data recorded. It is a mobile part on the Intel BGA 1528 socket, with a base clock of 1600.00 MHz and a boost clock of 4.10 GHz. The base clock figure is notably low, a common trait for low-power mobile chips.

The cache hierarchies also differ significantly. The Threadripper has 64 KB of L1 cache per core and 512 KB of L2 cache per core, with a massive 128 MB of L3 cache. The i5-8365U has the same 64 KB L1 per core, but only 256 KB of L2 per core and 6 MB of shared L3 cache. This difference in L3 cache size, 128 MB versus 6 MB, is one of the largest architectural gaps between the two.

Memory support is another divider. Both support DDR4, but the Threadripper uses a quad-channel memory bus with a bandwidth of 102.4 GB/s, while the i5-8365U uses a dual-channel bus with 38.4 GB/s. The AMD part also supports PCIe Gen 4, while the Intel chip is limited to PCIe Gen 3 with 16 lanes (CPU only).

Specification Differences

The specification tables highlight the stark contrast in intended use cases. The AMD Ryzen Threadripper 3960X has 24 cores and 48 threads, while the Intel Core i5-8365U has 4 cores and 8 threads. The base clocks are 3.80 GHz for AMD and 1600.00 MHz for Intel, with boost clocks of 4.50 GHz and 4.10 GHz respectively.

The TDP figures are 280 watts for the Threadripper and 15 watts for the i5-8365U. The AMD part has an unlocked multiplier, while the Intel part is locked. The production status shows the Threadripper as "Active" and the i5-8365U as "End-of-life." The release dates are close: the Threadripper was released on 2019-11-24, and the i5-8365U on 2019-04-15.

The launch MSRP for the Threadripper 3960X is $1399. The i5-8365U has a launch MSRP of $297. This is the only price information in the database, and it reflects the different market positioning.

The memory bandwidth is a major spec difference: 102.4 GB/s for the Threadripper versus 38.4 GB/s for the i5-8365U. The PCIe generation also differs, with the AMD part supporting Gen 4 and the Intel part Gen 3. The Threadripper has no integrated graphics, while the Intel chip includes UHD Graphics 620. The part numbers are recorded as 100-000000010100-100000010WOF for AMD and SRF9Z for Intel.