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

Where Each One Wins

The benchmark split between the AMD Ryzen 9 9955HX and Intel Core Ultra 9 285 is decisively lopsided in favor of Intel, which claims 10 of the 15 recorded head-to-head tests. However, the distribution of wins is not random: it follows a clear pattern tied to workload type. Intel dominates in single-threaded performance, floating-point math, encryption, physics simulation, and the newer Cinebench R23 suite. AMD counters with wins in integer math, data compression, extended instructions, random string sorting, and the older Cinebench R15 multicore test.

The most striking divergence is in Cinebench R23. Intel wins the multicore test by 24.1%, scoring 48945 against AMD's 37159, and wins the single-core test by an enormous 68.5%, with 6909 versus 2174. These are not marginal gaps; they represent a generational difference in how the two architectures prioritize per-thread throughput versus raw core count. Intel's 24 cores, all of which are full-performance cores without hyperthreading, deliver a higher aggregate score in R23 despite AMD having 32 threads from 16 cores.

AMD's wins are concentrated in workloads that reward high thread counts and large shared caches. The data compression test shows AMD ahead by 21.6%, scoring 731998 against Intel's 602121. Integer math goes to AMD by 28.9%, with 212598 versus 164869. Extended instructions favor AMD by 27.8%, at 57946 against 45357. These are compute patterns that scale with parallel throughput and cache capacity, areas where AMD's 64 MB of shared L3 cache and 32 threads provide a structural advantage.

Intel wins the remaining computation-heavy tests. Floating-point math goes to Intel by 29.9%, with 194988 versus 136682. Physics simulation favors Intel by 24.4%, at 3598 against 2720. Data encryption is Intel's by 20.5%, with 46949 versus 37330. Prime number finding, a workload sensitive to single-core efficiency, goes to Intel by 37.5%, with 459 versus 287. The single-thread PassMark test also favors Intel by 10%, at 4881 versus 4393.

The closest contest is PassMark multithread, where Intel edges AMD by just 0.8%, scoring 56602 versus 56171. This near-tie is remarkable given the architectural differences: AMD's 32 threads versus Intel's 24, and 55 W TDP versus 65 W TDP. The data indicates that in aggregate multithreaded throughput, the two processors are effectively equivalent, with the workload mix determining which pulls ahead.

Architecture Differences

The two processors come from fundamentally different design philosophies. AMD's Ryzen 9 9955HX is a mobile part built on the Zen 5 architecture with the Fire Range codename, fabricated on TSMC's 4 nm process. It uses a chiplet design with a die size of 2x 70.6 mm² and contains 16,630 million transistors. Intel's Core Ultra 9 285 is a desktop part based on the Arrow Lake architecture with the Arrow Lake-S codename, fabricated on TSMC's 3 nm process. It uses a monolithic die of 243 mm² and contains 17,800 million transistors.

Core counts differ substantially. AMD provides 16 cores and 32 threads, while Intel provides 24 cores and 24 threads, meaning Intel does not use simultaneous multithreading. This explains why AMD can match or beat Intel in certain parallel workloads despite having fewer physical cores. The cache hierarchy also diverges sharply. AMD allocates 80 KB of L1 cache per core and 1 MB of L2 per core, with a large 64 MB shared L3 pool. Intel allocates 192 KB of L1 per core and 3 MB of L2 per core, but only 36 MB of shared L3. AMD's larger L3 is likely a factor in its data compression and integer math wins.

Memory support is identical in type, both using DDR5 on a dual-channel bus, but bandwidth differs. Intel has a higher memory bandwidth at 102.4 GB/s versus AMD's 89.6 GB/s. Both support ECC memory. PCIe connectivity also differs: AMD offers Gen 5 with 28 lanes (CPU only), while Intel offers Gen 5 with 20 lanes (CPU only). The integrated graphics are distinct as well, with AMD using the Radeon 610M and Intel using the Arc Xe-LPG Graphics 64EU.

The process nodes and transistor counts indicate Intel has a density advantage, but AMD's dual-chiplet design allows for a smaller aggregate die area. The socket situation is entirely different: AMD uses Socket FL1 for mobile, while Intel uses Socket 1851 for desktop. AMD's multiplier is unlocked, while Intel's is locked. The release dates are close, with AMD launching on 2025-01-05 and Intel on 2024-12-31.

Head-to-Head Benchmarks

The largest single victory in either direction is Intel's 68.5% margin in Cinebench R23 single-core, where it scores 6909 against AMD's 2174. This is an exceptional gap that speaks to Intel's per-thread efficiency advantage in rendering workloads. The second-largest win is AMD's 28.9% margin in integer math, scoring 212598 versus 164869, followed closely by AMD's 27.8% win in extended instructions at 57946 versus 45357.

Intel's wins in Cinebench R15 single-core are similarly lopsided: 696 versus 336, a 51.7% margin in Intel's favor. In Cinebench R23 multicore, Intel leads by 24.1% with 48945 against 37159. Floating-point math sees Intel ahead by 29.9%, at 194988 versus 136682. Physics simulation favors Intel by 24.4%, at 3598 versus 2720. Encryption goes to Intel by 20.5%, with 46949 versus 37330.

AMD's wins are substantial but not as extreme. Data compression shows AMD ahead by 21.6%, at 731998 versus 602121. Integer math is AMD's largest margin at 28.9%. Extended instructions follow at 27.8%. Random string sorting favors AMD by 5.8%, with 77890 versus 73651. The Cinebench R15 multicore test goes to AMD by 19.7%, with 5905 versus 4933.

The PassMark single-thread tests are identical in score, both showing Intel at 4881 versus AMD's 4393, a 10% margin. The multithread test is nearly a dead heat, with Intel at 56602 and AMD at 56171, a 0.8% difference. This pair of results summarizes the overall picture: Intel is clearly faster per thread, while AMD's thread count compensates in parallel workloads to the point of near-parity.

Specification Differences

The specification table highlights the core architectural divergence. AMD offers 16 cores and 32 threads; Intel offers 24 cores and 24 threads. Base clocks are identical at 2.50 GHz for both, but boost clocks differ: AMD reaches 5.40 GHz, Intel reaches 5.60 GHz. TDP is another differentiator, with AMD at 55 W and Intel at 65 W. The process node differs, with AMD on 4 nm and Intel on 3 nm. Transistor counts are 16,630 million for AMD and 17,800 million for Intel. Die size is 2x 70.6 mm² for AMD versus 243 mm² for Intel.

Cache configurations are markedly different. AMD's L1 is 80 KB per core, Intel's is 192 KB per core. AMD's L2 is 1 MB per core, Intel's is 3 MB per core. AMD's L3 is 64 MB shared, Intel's is 36 MB shared. Memory bandwidth favors Intel at 102.4 GB/s versus AMD's 89.6 GB/s. PCIe lanes favor AMD at 28 versus Intel's 20, both Gen 5. The sockets are incompatible: AMD Socket FL1 versus Intel Socket 1851. Integrated graphics differ, with AMD's Radeon 610M versus Intel's Arc Xe-LPG Graphics 64EU. AMD's multiplier is unlocked; Intel's is not. Intel carries a launch MSRP of $579; AMD has no recorded launch MSRP.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 9 9955HX has 16 cores and 32 threads. The Intel Core Ultra 9 285 has 24 cores and 24 threads. Intel has more physical cores, but AMD has more threads due to simultaneous multithreading.

Q: Which processor wins in single-threaded performance?

A: The Intel Core Ultra 9 285 wins decisively. In Cinebench R23 single-core, it scores 6909 versus AMD's 2174, a 68.5% margin. In PassMark single-thread, Intel leads 4881 versus 4393, a 10% margin.

Q: How do the two compare in multithreaded workloads?

A: The PassMark multithread test shows a near-tie, with Intel at 56602 and AMD at 56171, a 0.8% difference. However, Cinebench R23 multicore favors Intel by 24.1%, with 48945 versus 37159, while Cinebench R15 multicore favors AMD by 19.7%, with 5905 versus 4933.

Q: What are the cache size differences?

A: AMD provides 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of shared L3. Intel provides 192 KB of L1 per core, 3 MB of L2 per core, and 36 MB of shared L3. AMD has significantly more L3 cache.

Q: Which processor has higher memory bandwidth?

A: The Intel Core Ultra 9 285 has higher memory bandwidth at 102.4 GB/s, compared to AMD's 89.6 GB/s. Both use DDR5 on a dual-channel bus and support ECC memory.

Q: Are both processors unlocked for overclocking?

A: No. The AMD Ryzen 9 9955HX has an unlocked multiplier. The Intel Core Ultra 9 285 has a locked multiplier.

The Verdict

The data indicates that the Intel Core Ultra 9 285 is the stronger processor for single-threaded and rendering workloads. Its 68.5% win in Cinebench R23 single-core and 24.1% win in Cinebench R23 multicore are decisive. Intel also wins in floating-point math, physics, encryption, and prime number finding, which are common in scientific computing and simulation. The 3 nm process node and higher boost clock of 5.60 GHz likely contribute to this edge.

The AMD Ryzen 9 9955HX is the better choice for workloads that leverage high thread counts and large cache. Its wins in integer math (28.9%), data compression (21.6%), and extended instructions (27.8%) show strength in data processing and parallel integer workloads. The 64 MB shared L3 cache and 32 threads provide a structural advantage in these areas. The near-tie in PassMark multithread (0.8% difference) confirms that AMD's thread count compensates for Intel's per-core speed in aggregate throughput.

The choice between these two comes down to workload mix. For users running Cinebench-style rendering, floating-point simulation, or encryption, the Intel Core Ultra 9 285 delivers clear margins. For users running data compression, integer-heavy processing, or extended instruction workloads, the AMD Ryzen 9 9955HX provides substantial wins. The Intel part also carries a launch MSRP of $579, while AMD has no recorded launch MSRP. The AMD part is mobile (Socket FL1) with a 55 W TDP, while Intel is desktop (Socket 1851) with a 65 W TDP, so platform compatibility is a decisive factor independent of raw performance. The recorded data supports a verdict: Intel for per-thread dominance and rendering, AMD for parallel integer throughput and cache-sensitive workloads.