AMD Ryzen 9 9950X3D vs Intel Core Ultra 7 366H Comparison

Head-to-Head Benchmarks

The benchmark data presents a lopsided contest. The AMD Ryzen 9 9950X3D wins 13 of the 15 shared tests, with the Intel Core Ultra 7 366H taking only two single-threaded victories. The scale of the AMD advantage varies dramatically by workload, from modest single-thread leads to near-triple performance in some multi-threaded tasks.

The largest margin belongs to PassMark integer math, where the Ryzen 9 9950X3D scores 243,209 against the Intel's 83,695, a delta of 190.6%. Data compression shows a 177.4% gap, with the AMD part recording 908,421 versus 327,455. Extended instructions follow at 171.4% (73,011 vs 26,901), and random string sorting lands at 139.7% (95,423 vs 39,814). These are not marginal differences; they indicate entirely different performance classes in compute-heavy workloads.

Cinebench R15 multicore reinforces the pattern. The AMD chip scores 6,536 against 2,870 for Intel, a 127.7% advantage. PassMark multithread shows 70,255 versus 33,429, a 110.2% gap. Physics simulation in PassMark delivers 5,670 against 2,880, a 96.9% edge. Prime number finding shows 613 versus 326, an 88% lead. The Ryzen's 16 cores with 32 threads simply overwhelm the Intel part's 16 threads in heavily parallel tasks.

Data encryption shows a 72.3% gap (44,536 vs 25,845), while floating-point math trails at 54.2% (159,724 vs 103,615). Cinebench R23 multicore shows 42,018 versus 28,477, a 47.6% delta. Even PassMark single-thread, an area where the Intel chip might be expected to compete, goes to AMD by 17.2% (4,737 vs 4,043).

The Intel Core Ultra 7 366H wins only the two Cinebench single-core tests. In R15 single-core, it posts 405 versus 350, a 13.6% edge. In R23 single-core, the margin expands to 43.8%, with scores of 4,020 versus 2,259. These wins are real but isolated; they do not translate into broader single-thread dominance in PassMark, where AMD still leads.

Where Each One Wins

The AMD Ryzen 9 9950X3D dominates every multi-threaded category in the shared benchmark set. Its wins span integer math, floating-point math, data compression, encryption, extended instructions, prime number computation, physics simulation, random string sorting, and both Cinebench multicore tests. The only shared single-thread test, PassMark single-thread, also goes to AMD. This makes the Ryzen the clear choice for rendering, scientific computation, data processing, and any workload that scales across cores.

The Intel Core Ultra 7 366H wins exclusively in Cinebench single-core tests. The R23 single-core result, 4,020 versus 2,259, shows a substantial 43.8% advantage in that specific benchmark. The R15 single-core win is smaller at 13.6% (405 vs 350). These results suggest the Intel chip has strong per-core performance in certain legacy or lightly threaded Cinebench workloads, but the PassMark single-thread score tells a different story, with AMD ahead 4,737 to 4,043.

The data does not show any mixed workloads where the Intel chip combines its single-core strengths with competitive multi-core output. Its 16 threads limit it in parallel tasks, while the Ryzen's 32 threads provide a structural advantage that appears across every multi-threaded test.

Architecture Differences

The two processors come from opposite ends of the computing spectrum. The AMD Ryzen 9 9950X3D is a desktop part built on the Zen 5 architecture, codenamed Granite Ridge, using TSMC's 4 nm process. It packs 16,630 million transistors across a dual-die design with each die measuring 2x 70.6 mm². The Intel Core Ultra 7 366H is a mobile processor using the Panther Lake architecture, built on Intel's 3 nm process, with no transistor or die size data recorded.

Core and thread counts differ despite both having 16 cores. The AMD chip supports 32 threads through simultaneous multithreading, while the Intel part runs 16 threads with no SMT. The Ryzen 9 9950X3D clocks between 4.30 GHz base and 5.70 GHz boost, while the Intel chip runs at 2.00 GHz base and 4.80 GHz boost. The TDP gap is enormous: 170 watts for AMD versus 25 watts for Intel, reflecting their desktop versus mobile positioning.

Cache configurations diverge sharply. The AMD processor uses 80 KB of L1 per core, 1 MB of L2 per core, and a massive 128 MB of L3 cache. The Intel chip has 192 KB of L1 per core, 2.5 MB of L2 per core, and only 18 MB of shared L3. The Ryzen's 128 MB L3 is likely a key factor in its integer and compression wins, as larger caches reduce memory traffic in data-heavy workloads.

Memory support also differs. Both use dual-channel memory, but the AMD part supports DDR5 with 89.6 GB/s bandwidth and ECC memory. The Intel chip supports DDR5 and LPDDR5X with 115.2 GB/s bandwidth but no ECC. PCIe connectivity favors AMD with 24 Gen 5 lanes, while Intel provides 12 Gen 5 lanes. Both include integrated graphics: Radeon Graphics on AMD and Intel Xe3 Graphics on Intel.

The sockets reflect their intended platforms: AMD Socket AM5 for the desktop Ryzen, and Intel BGA 2540 for the mobile Ultra. The AMD multiplier is unlocked, while the Intel multiplier is locked. The AMD chip launched with a $699 MSRP, while no launch MSRP is recorded for the Intel part. The Ryzen 9 9950X3D released in January 2025, and the Intel Core Ultra 7 366H has a release date of January 2026.

FAQ

Q: Which processor has more threads?

A: The AMD Ryzen 9 9950X3D has 32 threads from 16 cores, while the Intel Core Ultra 7 366H has 16 threads from 16 cores.

Q: Does the Intel chip win any benchmarks?

A: Yes, the Intel Core Ultra 7 366H wins Cinebench R15 single-core (405 vs 350, a 13.6% edge) and Cinebench R23 single-core (4,020 vs 2,259, a 43.8% edge).

Q: How much L3 cache does each processor have?

A: The AMD Ryzen 9 9950X3D has 128 MB of L3 cache, while the Intel Core Ultra 7 366H has 18 MB of shared L3 cache.

Q: What is the largest benchmark gap between the two?

A: The largest gap is in PassMark integer math, where the AMD chip scores 243,209 versus 83,695 for Intel, a 190.6% difference.

Q: Which processor has higher memory bandwidth?

A: The Intel Core Ultra 7 366H has 115.2 GB/s memory bandwidth, which is higher than the AMD Ryzen 9 9950X3D's 89.6 GB/s, despite the AMD chip winning most compute benchmarks.

Q: What are the power requirements for each?

A: The AMD Ryzen 9 9950X3D has a 170 watt TDP, while the Intel Core Ultra 7 366H has a 25 watt TDP. The Intel part is designed for mobile use with a BGA 2540 socket.

The Verdict

The benchmark data positions these processors for entirely different purposes. The AMD Ryzen 9 9950X3D is a high-performance desktop processor that leads in 13 of 15 shared tests, including every multi-threaded workload. Its 32 threads, 128 MB of L3 cache, and 5.70 GHz boost clock deliver decisive wins in integer math, floating-point math, compression, encryption, and rendering workloads. The 95th percentile ranking among all CPUs and an average benchmark score of 75,779 confirm its position near the top of the desktop hierarchy.

The Intel Core Ultra 7 366H is a mobile processor with a 25 watt TDP, designed for laptops. Its 16 threads and 18 MB of L3 cache limit its multi-threaded performance, but its Cinebench single-core wins show competitive per-core capability in specific workloads. The 87th percentile ranking and average score of 41,263 place it in a lower performance tier overall, though its 3 nm process and 115.2 GB/s memory bandwidth indicate a focus on efficiency rather than raw compute.

Users requiring maximum multi-threaded throughput for rendering, simulation, data analysis, or software compilation should select the AMD Ryzen 9 9950X3D. The data shows no scenario where the Intel chip outperforms it in parallel workloads, and even in single-threaded PassMark testing, AMD holds a 17.2% lead. The Intel Core Ultra 7 366H suits mobile systems where the 25 watt TDP and integrated Intel Xe3 Graphics are priorities, and where Cinebench single-core performance matters more than multi-threaded throughput. The recorded data offers no evidence that the Intel part can match the Ryzen's compute density in any shared benchmark category beyond those two Cinebench single-core tests.