AMD Ryzen 9 9955HX3D vs Intel Core Ultra 9 285 Comparison

AMD Ryzen 9 9955HX3D and Intel Core Ultra 9 285 represent two distinct approaches to high-end processing, one aimed at mobile workstations and the other at desktop performance. The database records 15 head-to-head benchmark comparisons, with the AMD part winning 8 and the Intel part winning 7. This near-even split hides a clear pattern: the AMD chip dominates in integer-heavy and multi-threaded workloads, while the Intel chip wins decisively in single-core and floating-point tests. The following analysis breaks down the recorded data, architecture differences, and specific use cases for each processor.

Head-to-Head Benchmarks

The largest single victory for the AMD Ryzen 9 9955HX3D comes in the PassMark extended instructions test, where it scores 62,813 against the Intel Core Ultra 9 285’s 45,357, a 38.5% advantage. This is followed by a 35% win in PassMark integer math (222,503 vs 164,869) and a 30.5% margin in PassMark data compression (785,811 vs 602,121). The AMD chip also leads in PassMark physics by 30.3% (4,687 vs 3,598) and in Cinebench R15 multi-core by 22.5% (6,042.5 vs 4,933). Smaller wins for AMD include PassMark multi-thread (10.7% ahead at 62,674 vs 56,602), PassMark random string sorting (13.4% ahead at 83,497 vs 73,651), and PassMark find prime numbers (14.4% ahead at 525 vs 459).

The Intel Core Ultra 9 285 counters with its most dramatic margin in Cinebench R23 single-core, where it scores 6,909 against AMD’s 2,159.5, a 68.7% difference. It also wins Cinebench R15 single-core by 52.3% (696 vs 332) and Cinebench R23 multi-core by 22% (48,945 vs 38,161.5). In floating-point math, Intel leads by 26.1% (194,988 vs 144,122). The remaining Intel victories are narrower: PassMark data encryption is 16% ahead (46,949 vs 39,446), and PassMark single-thread is 7.6% ahead (4,881 vs 4,511, recorded identically in both the single-thread and singlethread fields).

The data shows a clear split. AMD’s wins are concentrated in workloads that reward high core counts, cache capacity, and integer throughput. Intel’s wins are in single-threaded tasks and floating-point calculations, where its per-core efficiency and clock speed (5.60 GHz boost vs AMD’s 5.40 GHz) appear to provide an edge. The Cinebench R23 multi-core result is notable: despite AMD winning the older R15 multi-core test, Intel takes the newer R23 multi-core test by a substantial 22% margin, suggesting differences in how the two architectures scale under different rendering workloads.

Architecture Differences

The AMD Ryzen 9 9955HX3D uses the Zen 5 architecture under the Fire Range codename, built on TSMC’s 4 nm process. It contains 16 cores and 32 threads, with a base clock of 2.50 GHz and a boost clock of 5.40 GHz. The chip is designed for the AMD Socket FL1 mobile platform and carries a TDP of 55 watts. Its cache layout includes 80 KB of L1 per core, 1 MB of L2 per core, and a substantial 128 MB of L3 cache. The transistor count is 16,630 million, spread across a die size of 2x 70.6 mm². The integrated graphics are Radeon 610M, and the memory bus is dual-channel DDR5 with 89.6 GB/s bandwidth. The multiplier is unlocked, and it supports ECC memory.

The Intel Core Ultra 9 285 uses the Arrow Lake architecture under the Arrow Lake-S codename, built on TSMC’s 3 nm process. It has 24 cores but only 24 threads, meaning no hyperthreading, with the same 2.50 GHz base clock but a higher 5.60 GHz boost clock. It targets the Intel Socket 1851 desktop platform with a TDP of 65 watts. The cache is configured as 192 KB of L1 per core, 3 MB of L2 per core, and 36 MB of shared L3. The transistor count is 17,800 million on a 243 mm² die. It integrates Arc Xe-LPG Graphics with 64 execution units, uses dual-channel DDR5 with 102.4 GB/s bandwidth, and also supports ECC memory. The multiplier is locked, and it has 20 PCIe Gen 5 lanes (CPU only) compared to AMD’s 28 lanes.

The most significant architectural difference is the core/thread configuration: AMD provides 32 threads from 16 cores, while Intel provides 24 threads from 24 cores. This partly explains AMD’s multi-threaded wins in PassMark tests, while Intel’s higher boost clock and newer 3 nm process support its single-core dominance. The L3 cache difference is stark: 128 MB on AMD versus 36 MB on Intel, which likely contributes to AMD’s data compression and integer math advantages. Process node and foundry are the same (TSMC), but the node size differs (4 nm vs 3 nm), and the die designs are fundamentally different: AMD uses two 70.6 mm² chiplets, Intel uses a single 243 mm² monolithic die.

FAQ

Q: Which processor wins more head-to-head benchmarks?

A: The AMD Ryzen 9 9955HX3D wins 8 of the 15 recorded comparisons, while the Intel Core Ultra 9 285 wins 7.

Q: What is the largest single benchmark margin between the two?

A: The largest margin is in Cinebench R23 single-core, where the Intel Core Ultra 9 285 scores 6,909 versus AMD’s 2,159.5, a 68.7% difference.

Q: How do the two compare in multi-threaded performance?

A: AMD wins PassMark multi-thread by 10.7% (62,674 vs 56,602) and Cinebench R15 multi-core by 22.5% (6,042.5 vs 4,933), but Intel wins Cinebench R23 multi-core by 22% (48,945 vs 38,161.5).

Q: Which chip has more cores and threads?

A: The Intel Core Ultra 9 285 has 24 cores and 24 threads, while the AMD Ryzen 9 9955HX3D has 16 cores and 32 threads.

Q: Do both processors support ECC memory?

A: Yes, the database records ECC memory support as true for both the AMD Ryzen 9 9955HX3D and the Intel Core Ultra 9 285.

Q: What is the difference in L3 cache capacity?

A: The AMD Ryzen 9 9955HX3D has 128 MB of L3 cache, while the Intel Core Ultra 9 285 has 36 MB of shared L3 cache.

Specification Differences

The two processors differ across several recorded specifications. The AMD Ryzen 9 9955HX3D has 16 cores and 32 threads, while the Intel Core Ultra 9 285 has 24 cores and 24 threads. The boost clock differs: 5.40 GHz for AMD versus 5.60 GHz for Intel. The TDP is 55 watts for AMD and 65 watts for Intel. The socket is AMD Socket FL1 for the former and Intel Socket 1851 for the latter. The architecture is Zen 5 (Fire Range) for AMD and Arrow Lake (Arrow Lake-S) for Intel. Process node is 4 nm for AMD and 3 nm for Intel. Transistor counts are 16,630 million versus 17,800 million. Die size is 2x 70.6 mm² for AMD and 243 mm² for Intel. L1 cache is 80 KB per core on AMD and 192 KB per core on Intel. L2 cache is 1 MB per core on AMD and 3 MB per core on Intel. L3 cache is 128 MB on AMD and 36 MB shared on Intel. Memory bandwidth is 89.6 GB/s for AMD and 102.4 GB/s for Intel. PCIe lanes are 28 on AMD and 20 on Intel. Integrated graphics are Radeon 610M on AMD and Arc Xe-LPG Graphics 64EU on Intel. Market segment is Mobile for AMD and Desktop for Intel. Release dates are 2025-01-05 for AMD and 2024-12-31 for Intel. The multiplier is unlocked on AMD and locked on Intel. The Intel part has a launch MSRP of $579; the AMD part has no recorded launch MSRP.

Where Each One Wins

The AMD Ryzen 9 9955HX3D wins in workloads that benefit from its 32 threads and 128 MB of L3 cache. The data shows clear advantages in data compression (30.5% ahead), integer math (35% ahead), extended instructions (38.5% ahead), physics (30.3% ahead), and random string sorting (13.4% ahead). It also wins PassMark multi-thread and find prime numbers. These results point to strengths in database operations, compression workloads, scientific simulations, and any task that leverages massive L3 cache and high thread counts. The unlocked multiplier is an additional factor for users who plan to overclock, though the mobile segment limits that scenario.

The Intel Core Ultra 9 285 wins in single-threaded performance and floating-point math. Its Cinebench R23 single-core score is 68.7% higher, and its Cinebench R15 single-core score is 52.3% higher. It also leads in floating-point math by 26.1%, data encryption by 16%, and PassMark single-thread by 7.6%. The Cinebench R23 multi-core win by 22% is notable, as it suggests Intel’s 24 cores without hyperthreading can outperform AMD’s 16 cores with hyperthreading in certain rendering workloads. This makes the Intel chip better suited for single-threaded applications, floating-point-heavy calculations, encryption tasks, and some modern rendering engines. The desktop segment and locked multiplier indicate a more traditional desktop use case.

The Verdict

The data supports a split decision based on workload type. The AMD Ryzen 9 9955HX3D is the choice for multi-threaded integer tasks, data compression, and cache-sensitive workloads, as evidenced by its 8 wins including dominant margins in extended instructions and integer math. Its 32 threads and 128 MB L3 cache provide a measurable advantage in these areas. The Intel Core Ultra 9 285 is the choice for single-threaded performance and floating-point workloads, with its 7 wins highlighted by a 68.7% lead in Cinebench R23 single-core and a 22% lead in the same suite’s multi-core test. The Intel chip’s higher boost clock, 3 nm process, and 24 physical cores give it an edge in per-core efficiency and modern rendering. The AMD part suits mobile workstations requiring high throughput in compression and integer operations, while the Intel part suits desktop users prioritizing single-core speed and floating-point capability. Neither chip dominates overall; the recorded benchmark results indicate complementary strengths.