AMD Ryzen 9 3900XT vs Intel Core i5-12600HX Comparison

The AMD Ryzen 9 3900XT and Intel Core i5-12600HX are both 12-core processors, but they target entirely different platforms and performance profiles. The AMD part is a desktop chip built on Zen 2, while the Intel is a mobile chip using the hybrid Alder Lake architecture. Benchmark results show a decisive overall victory for the AMD processor, which wins 15 of the 17 shared tests, yet the Intel chip claims a significant win in single-threaded PassMark testing. The average benchmark scores are close — 33736 for the AMD versus 33375 for the Intel — but that average masks the starkly different workload behaviors detailed below.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head data is the AMD Ryzen 9 3900XT’s dominance across nearly every multi-threaded and compute-heavy workload. In Cinebench testing, the margin is consistent and large: the AMD scores 2790 versus 2087 in R15 multi-core, 11628 versus 8699 in R20 multi-core, and 27688 versus 20714 in R23 multi-core. Each of those results represents a 33.7% advantage for the AMD chip. The single-core Cinebench results tell the same story, with the AMD leading by 33.7% in R15 (393 vs 294) and R23 (3909 vs 2924), and by 33.6% in R20 (1641 vs 1228). These are not marginal wins; the Ryzen 9 3900XT is delivering roughly a third more performance across the board in Cinebench.

The PassMark suite reinforces the AMD’s lead in most threaded tasks, often by even larger margins. The biggest gap is in prime number finding, where the AMD scores 214 versus the Intel’s 83 — a 157.8% difference. Data encryption also shows a massive 63.6% lead for the AMD (28634 vs 17506), and extended instructions testing gives the AMD a 65% advantage (28586 vs 17328). Data compression favors the AMD by 54.8%, with scores of 452328 versus 292256. Random string sorting is 46% better on the AMD (48327 vs 33110), and integer math is 25.7% ahead (99722 vs 79339). The multi-thread PassMark score sums this up: 32575 for the AMD versus 24681 for the Intel, a 32% lead.

However, the picture is not one-sided. In the PassMark single-thread test, the Intel Core i5-12600HX takes a clear victory, scoring 3623 versus the AMD’s 2742 — a 24.3% advantage for Intel. This is a substantial reversal from the Cinebench single-core results, where the AMD was ahead by roughly 33%. The floating-point math test is nearly a dead heat, with the AMD winning by just 0.2% (58513 vs 58378), and the physics test goes to the AMD by 18.1% (1776 vs 1504). Overall, the AMD wins 15 tests and the Intel wins 2, but the Intel’s single-thread PassMark win is notable because it highlights the efficiency of the Alder Lake architecture in specific single-core workloads.

The Verdict

The data is unambiguous: for any workload that scales with cores and threads, the AMD Ryzen 9 3900XT is the superior processor. It leads by roughly 32-34% in Cinebench multi-core tests and by even larger margins in several PassMark tasks like encryption and prime number finding. The AMD also holds a 84th percentile ranking among all CPUs, compared to the Intel’s 83rd, and its average benchmark score of 33736 edges out the Intel’s 33375. The AMD’s 24 threads versus the Intel’s 16 threads provide a clear advantage in heavily threaded applications, and the data shows this translates directly into higher scores.

The Intel Core i5-12600HX, however, is not without its merits. Its 24.3% win in PassMark single-thread testing suggests that for lightly threaded, latency-sensitive tasks, the Intel chip can feel snappier. The fact that it achieves this with a 55W TDP versus the AMD’s 105W TDP also makes it the more power-efficient option in this comparison, which is critical for mobile use. The Intel chip also includes UHD Graphics 770 integrated graphics, whereas the AMD has none, making the Intel a more self-contained solution for a laptop.

Who should pick which? If the workload is rendering, encoding, compiling, or any multi-threaded compute, the Ryzen 9 3900XT is the clear choice based on the benchmark data. If the use case involves a laptop with power limits and a need for integrated graphics, the Core i5-12600HX is the only viable option of the two, and its single-thread performance is a bonus. The AMD is a desktop part; the Intel is a mobile part. They will rarely be in the same system, but when compared directly, the AMD wins the performance crown while the Intel wins on efficiency and portability.

Architecture Differences

The two processors are built on fundamentally different architectures. The AMD Ryzen 9 3900XT uses the Zen 2 architecture on the Matisse 2 codename, fabricated on a 7 nm process at TSMC. It is a monolithic design with a chiplet layout, reflected in the die size of 2x 74 mm² and 7,600 million transistors. The Intel Core i5-12600HX uses the Alder Lake architecture on the Alder Lake-HX codename, built on a 10 nm process at Intel. Its die size is 215 mm², and it uses a hybrid architecture of Performance-cores and Efficient-cores, which is a key design difference from the AMD’s uniform core layout.

Cache configurations differ significantly. The AMD has 64 KB of L1 per core, 512 KB of L2 per core, and a massive 64 MB of shared L3 cache. The Intel has 80 KB of L1 per core, 1.25 MB of L2 per core, but only 18 MB of shared L3 cache. The AMD’s larger L3 is clearly a factor in its multi-threaded performance, while the Intel’s higher per-core L1 and L2 may contribute to its single-thread PassMark win. The Intel also supports ECC memory, which the AMD does not, and the AMD supports DDR4 memory only, while the Intel supports both DDR4 and DDR5.

PCIe capabilities also differ. The AMD offers PCIe Gen 4 with 24 lanes, while the Intel offers PCIe Gen 5 with 20 lanes. The Intel includes integrated UHD Graphics 770, whereas the AMD has no integrated graphics at all. The Intel’s hybrid core design is a fundamental architectural shift that allows it to balance performance and efficiency, but in this head-to-head, the AMD’s more straightforward high-core-count design wins most benchmarks.

Specification Differences

The most obvious specification difference is the thread count: the AMD Ryzen 9 3900XT has 24 threads, while the Intel Core i5-12600HX has 16 threads. Both have 12 cores, but the AMD uses simultaneous multithreading to double its thread count. Clock speeds also differ, with the AMD having a base clock of 3.90 GHz and a boost clock of 4.70 GHz, versus the Intel’s 2.50 GHz base and 4.60 GHz boost. The AMD’s higher base clock is a major factor in its multi-threaded performance, while the Intel’s lower base clock is offset by its higher single-thread efficiency in some tests.

The TDP is a stark contrast: the AMD is rated at 105W, while the Intel is rated at 55W. This reflects their intended markets — desktop versus mobile. The AMD uses the AMD Socket AM4, while the Intel uses the Intel BGA 1964 socket, which is soldered for laptops. Memory bandwidth is listed at 51.2 GB/s for the AMD, while no figure is provided for the Intel. The AMD has a launch MSRP of $499, and the Intel has a launch MSRP of $284. The Intel has a larger die at 215 mm² compared to the AMD’s 2x 74 mm², and the Intel supports ECC memory while the AMD does not.

FAQ

Q: Which processor has more threads?

A: The AMD Ryzen 9 3900XT has 24 threads, while the Intel Core i5-12600HX has 16 threads. Both have 12 cores.

Q: What is the biggest performance gap between the two?

A: The largest delta is in the PassMark find prime numbers test, where the AMD Ryzen 9 3900XT scores 214 versus the Intel’s 83, a 157.8% advantage for AMD.

Q: Does the Intel chip ever win a benchmark?

A: Yes, the Intel Core i5-12600HX wins the PassMark single-thread test, scoring 3623 versus the AMD’s 2742, a 24.3% lead for Intel.

Q: Which processor supports ECC memory?

A: The Intel Core i5-12600HX supports ECC memory (true), while the AMD Ryzen 9 3900XT does not (false).

Q: What is the TDP difference?

A: The AMD Ryzen 9 3900XT has a TDP of 105W, while the Intel Core i5-12600HX has a TDP of 55W.

Q: Do both processors have integrated graphics?

A: No. The Intel Core i5-12600HX includes UHD Graphics 770, while the AMD Ryzen 9 3900XT has no integrated graphics (null).

Where Each One Wins

The AMD Ryzen 9 3900XT wins in every multi-threaded benchmark category except for the single-thread PassMark test. Its advantages are most pronounced in compute-heavy tasks: prime number finding (157.8% lead), data encryption (63.6%), extended instructions (65%), and data compression (54.8%). Cinebench multi-core tests show a consistent 33.7% advantage, and the multi-thread PassMark score is 32% higher. This makes the AMD the clear choice for rendering, video encoding, scientific computing, and any workload that can utilize its 24 threads and 64 MB of L3 cache. Its 84th percentile ranking versus the Intel’s 83rd further confirms its overall standing.

The Intel Core i5-12600HX wins the PassMark single-thread test by 24.3%, which is its only benchmark victory. This indicates that for tasks like web browsing, office applications, or older games that rely on a few fast cores, the Intel chip can feel more responsive. Its 55W TDP also makes it the more power-efficient choice, and it is the only option with integrated graphics and ECC memory support. The Intel’s 10 nm process and hybrid Alder Lake architecture deliver strong single-core efficiency, but the data shows that for sustained multi-threaded workloads, the AMD Ryzen 9 3900XT is in a different class.