AMD Ryzen 7 9850X3D vs Intel Core Ultra X9 378H Comparison

The AMD Ryzen 7 9850X3D and Intel Core Ultra X9 378H represent two fundamentally different approaches to computing, one aimed at desktop enthusiasts and the other at premium mobility. Across 15 head-to-head benchmark comparisons, the AMD processor claims victory in 10 tests while the Intel chip takes 5, yet the nature of those wins reveals a clear performance split. The Ryzen 7 9850X3D demonstrates dominance in integer-heavy and system-level workloads, while the Core Ultra X9 378H proves superior in single-threaded tasks and floating-point calculations.

Where Each One Wins

The recorded data shows the AMD Ryzen 7 9850X3D as the stronger choice for content creation and general productivity tasks that rely on massive L3 cache and high core clocks. It wins passmark integer math by a decisive 33% margin, delivering a score of 123140 against 92603. The chip also leads in data compression with a 22.7% advantage, posting 474501 versus 386591, and in extended instructions where it records 39272 compared to 31315, a 25.4% gap. These results indicate the desktop part excels when software can leverage large data sets and repeated operations.

The Intel Core Ultra X9 378H dominates in scenarios that favor high single-core frequency and modern architectural efficiency. Cinebench R23 single-core shows the Intel part at 4595 versus 2228, a massive 51.5% lead, and Cinebench R15 single-core follows with 462 against 343, a 25.8% advantage. The mobile chip also leads in floating-point math, scoring 114500 versus 81998, a 28.4% gap, and data encryption at 29840 versus 22856, a 23.4% edge. This pattern suggests the Intel processor is better suited for lightly threaded applications, spreadsheet recalculation, and physics simulation where floating-point throughput matters.

Architecture Differences

The two processors come from opposite design philosophies. The AMD Ryzen 7 9850X3D uses the Zen 5 architecture on the Granite Ridge codename, built on a 4 nm process at TSMC. It features 8 cores and 16 threads with a base clock of 4.70 GHz and a boost clock of 5.60 GHz. The chip carries 8,315 million transistors on a 70.6 mm² die. Cache design is a major differentiator: 80 KB of L1 per core, 1 MB of L2 per core, and a substantial 96 MB of shared L3 cache. This large cache pool drives its wins in compression and integer workloads.

The Intel Core Ultra X9 378H belongs to the Core Ultra Series 3 with the Panther Lake codename, fabricated on Intel's 3 nm process. It provides 16 cores and 16 threads, meaning no simultaneous multithreading, with a base clock of 2.00 GHz and a boost clock of 5.00 GHz. The cache hierarchy differs significantly: 192 KB of L1 per core, 2.5 MB of L2 per core, and only 18 MB of shared L3 cache. Despite the smaller L3, the Intel part achieves higher single-thread scores, likely due to its superior per-core performance and higher boost frequency relative to its modest base.

The process node difference is notable: Intel uses 3 nm versus AMD's 4 nm, which contributes to the mobile chip's efficiency. The Intel processor has a TDP of 25 watts, while the AMD part consumes 120 watts. The AMD chip supports ECC memory and has an unlocked multiplier, whereas the Intel chip lacks ECC support and is locked. The AMD part uses DDR5 memory with a dual-channel bus and 89.6 GB/s bandwidth, while the Intel part uses LPDDR5X with dual-channel and a much higher 153.6 GB/s bandwidth.

Head-to-Head Benchmarks

Cinebench R23 multicore delivers the largest single benchmark gap in favor of Intel. The Core Ultra X9 378H scores 32553 against 22807 for the Ryzen, a 29.9% advantage. This result may seem counterintuitive given the AMD chip's higher TDP and desktop orientation, but the Intel processor's 16 physical cores, even without SMT, provide more parallel throughput in this heavily multithreaded render test. The AMD chip does win Cinebench R15 multicore, scoring 3551 versus 3281, a modest 8.2% lead.

Single-thread performance shows the starkest architectural difference. Cinebench R23 single-core favors Intel by 51.5%, and R15 single-core by 25.8%. The Intel part's boost clock of 5.00 GHz combined with its newer 3 nm process yields exceptional per-core performance. The AMD chip's 5.60 GHz boost clock does not translate to single-thread wins, suggesting the Zen 5 cores lag in instructions per clock in these specific tests.

The passmark suite reveals the AMD chip's strengths. Integer math shows a 33% lead, the largest win for either processor. Physics tests favor AMD by 22.5% (4171 versus 3404), and random string sorting goes to AMD by 11.5% (49764 versus 44648). The multithread test, which measures overall parallelism, goes to AMD by 7.9% (41318 versus 38298). In single-thread passmark, AMD wins 4704 versus 4453, a 5.6% edge, which contrasts sharply with the Cinebench single-core results and suggests test methodology differences.

Floating-point math heavily favors Intel, with a 28.4% lead (114500 versus 81998). Data encryption also goes to Intel by 23.4% (29840 versus 22856). The AMD chip counters with extended instructions at 25.4% (39272 versus 31315) and prime number finding at 21.8% (435 versus 357).

Specification Differences

The two parts diverge on nearly every specification. The AMD Ryzen 7 9850X3D uses 8 cores and 16 threads, while the Intel Core Ultra X9 378H provides 16 cores and 16 threads. Base clocks differ dramatically: 4.70 GHz for AMD versus 2.00 GHz for Intel. Boost clocks are closer, 5.60 GHz versus 5.00 GHz. TDP ranges from 120 watts for the desktop part to 25 watts for the mobile part.

The AMD chip uses the AMD Socket AM5, while the Intel chip uses Intel BGA 2540, confirming the desktop versus mobile positioning. The AMD part has 24 PCIe Gen 5 lanes from the CPU, while the Intel part has only 4. The AMD chip includes Radeon Graphics as integrated graphics; the Intel chip features Arc B390. The AMD processor is unlocked for overclocking and has a launch MSRP of $499. The Intel processor is locked and has no recorded launch MSRP. The AMD part supports ECC memory; the Intel part does not. The AMD chip was released on 2026-01-28, while the Intel chip followed on 2026-04-03.

Memory bandwidth heavily favors Intel at 153.6 GB/s versus 89.6 GB/s, a direct result of LPDDR5X support against standard DDR5. The Intel chip also features larger per-core L1 and L2 caches, 192 KB and 2.5 MB respectively, compared to AMD's 80 KB and 1 MB. The AMD chip compensates with 96 MB of shared L3, more than five times the Intel chip's 18 MB.

FAQ

Q: Which processor is faster in single-core benchmarks?

A: The Intel Core Ultra X9 378H leads in single-core tests, winning Cinebench R23 single-core by 51.5% (4595 versus 2228) and Cinebench R15 single-core by 25.8% (462 versus 343). The AMD Ryzen 7 9850X3D does win the passmark single-thread test by 5.6% (4704 versus 4453).

Q: Which processor has more cores and threads?

A: The Intel Core Ultra X9 378H has 16 cores and 16 threads. The AMD Ryzen 7 9850X3D has 8 cores and 16 threads.

Q: How does the L3 cache compare between the two?

A: The AMD Ryzen 7 9850X3D features 96 MB of shared L3 cache, while the Intel Core Ultra X9 378H has 18 MB of shared L3 cache.

Q: Which processor has a higher boost clock?

A: The AMD Ryzen 7 9850X3D has a boost clock of 5.60 GHz, higher than the Intel Core Ultra X9 378H's 5.00 GHz.

Q: What is the TDP difference between the two processors?

A: The AMD Ryzen 7 9850X3D has a TDP of 120 watts, while the Intel Core Ultra X9 378H has a TDP of 25 watts.

Q: Which processor has higher memory bandwidth?

A: The Intel Core Ultra X9 378H supports LPDDR5X memory with 153.6 GB/s bandwidth, compared to the AMD Ryzen 7 9850X3D's DDR5 memory with 89.6 GB/s bandwidth.