AMD Ryzen 9 9900X3D vs Intel Core Ultra 7 366H Comparison

Head-to-Head Benchmarks

The benchmark data records a decisive sweep: AMD Ryzen 9 9900X3D wins all 17 head-to-head comparisons against Intel Core Ultra 7 366H. The largest margins appear in compute-heavy workloads. In PassMark integer math, the AMD part scores 179,727 versus 83,695, a 114.7% advantage. Data compression shows a similar pattern, 685,074 against 327,455, a 109.2% lead. Extended instructions follow at 106% ahead, 55,426 versus 26,901.

Cinebench results cluster tightly around a 67.6% to 67.7% delta across all six tests. The R15 multicore run shows 4,811 versus 2,870, while R23 multicore records 47,737 versus 28,477. Single-core deltas mirror the multicore margins: R15 single scores 679 versus 405, R20 single 2,830 versus 1,688, and R23 single 6,739 versus 4,020. This consistency suggests the performance gap is structural, not workload-specific.

PassMark multithread places the AMD part at 56,154 versus 33,429, a 68% lead. Physics simulation shows 5,340 versus 2,880, an 85.4% margin. Random string sorting delivers 71,864 versus 39,814, an 80.5% advantage. Prime number finding records 544 versus 326, a 66.9% gap. Floating point math is the closest contest among the compute tests, with 119,622 versus 103,615, a 15.4% lead for AMD.

The narrowest overall margin appears in single-thread PassMark: 4,646 versus 4,043, a 14.9% difference. Data encryption shows a 28.8% gap, 33,282 versus 25,845. The overall average benchmark scores reflect this spread: the AMD part averages 54,762 against 41,263 for Intel, placing the former at the 91st percentile of all CPUs and the latter at the 87th percentile.

Architecture Differences

The two processors represent fundamentally different design philosophies. AMD Ryzen 9 9900X3D uses Zen 5 architecture on TSMC 4 nm process, codename Granite Ridge, part of the 9000 series. Intel Core Ultra 7 366H uses Panther Lake architecture on Intel 3 nm process, belonging to Core Ultra Series 3. Both are active production parts, but they target distinct market segments: AMD for desktop, Intel for mobile.

Core configurations differ substantially. AMD provides 12 cores and 24 threads, while Intel offers 16 cores and 16 threads. This means AMD relies on simultaneous multithreading to reach 24 threads, whereas Intel runs one thread per core. The thread count advantage for AMD (24 versus 16) partially explains its multicore dominance despite fewer physical cores.

Cache hierarchies show major divergence. AMD allocates 80 KB L1 per core, 1 MB L2 per core, and a large 128 MB L3 cache. Intel uses 192 KB L1 per core, 2.5 MB L2 per core, and 18 MB shared L3. The AMD L3 cache is over seven times larger, which benefits workloads with large working sets. Intel's larger per-core L1 and L2 caches help with latency-sensitive single-thread tasks, but the benchmark data shows AMD still leads in that area.

Clock specifications favor AMD. Base clock sits at 4.40 GHz versus 2.00 GHz, boost at 5.50 GHz versus 4.80 GHz. Power envelopes differ dramatically, with AMD rated at 120 W TDP and Intel at 25 W TDP. This reflects the desktop versus mobile positioning, though benchmark scores do not normalize for power consumption.

Process node and foundry also differ. AMD uses TSMC 4 nm with 16,630 million transistors on a dual-chip design of 2x 70.6 mm². Intel uses its own 3 nm process; transistor count and die size are not recorded in the database. Memory support overlaps on DDR5, but Intel adds LPDDR5X support. Memory bandwidth favors Intel at 115.2 GB/s versus 89.6 GB/s. AMD supports ECC memory, Intel does not.

PCIe connectivity differs: AMD provides Gen 5 with 24 CPU lanes, Intel provides Gen 5 with 12 CPU lanes. Integrated graphics also differ, with AMD using Radeon Graphics and Intel using Xe3 Graphics. AMD has an unlocked multiplier, Intel does not. Release dates are close, with AMD launched January 5, 2025 and Intel January 4, 2026.

Where Each One Wins

The recorded data shows no benchmark wins for Intel Core Ultra 7 366H. Every head-to-head comparison favors AMD Ryzen 9 9900X3D. However, the margins vary meaningfully by workload category, which indicates where each processor is relatively stronger.

AMD shows its largest advantages in integer math (114.7%), data compression (109.2%), and extended instructions (106%). These are throughput-oriented workloads that benefit from high core counts, high clocks, and large caches. The 24 threads versus 16 threads, combined with 5.50 GHz boost and 128 MB L3, produce outsized gains in these parallel integer tasks.

Physics simulation (85.4% lead) and random string sorting (80.5% lead) also show substantial AMD advantages. These workloads respond to raw compute throughput and memory subsystem efficiency. The 68% multithread lead and 67.6% to 67.7% Cinebench margins confirm consistent multicore superiority across rendering and general compute.

The closest contests reveal where Intel remains comparatively competitive. Floating point math shows only a 15.4% AMD lead, the smallest gap in the entire dataset. Single-thread PassMark follows at 14.9%. Data encryption shows a 28.8% gap. These results indicate that Intel's Panther Lake architecture, despite lower clocks and fewer threads, narrows the deficit in single-thread floating-point and encryption workloads. The 3 nm process and larger per-core L1/L2 caches may contribute to this relative strength.

For the Intel part, the best-case scenario appears in workloads where its higher memory bandwidth (115.2 GB/s versus 89.6 GB/s) and larger per-core cache could matter. However, the recorded benchmark scores do not include tests that specifically isolate memory bandwidth. The nearest rivals for Intel, such as Intel Core Ultra 7 356H and AMD Ryzen AI 5 PRO 440, both score within 0.1% of the 366H, confirming it sits near the middle of its mobile class.

Specification Differences

The two processors differ across nearly every specification field. Core count: 12 for AMD, 16 for Intel. Thread count: 24 versus 16. Base clock: 4.40 GHz versus 2.00 GHz. Boost clock: 5.50 GHz versus 4.80 GHz. TDP: 120 W versus 25 W. Socket: AMD Socket AM5 versus Intel BGA 2540. Architecture: Zen 5 versus Panther Lake. Process node: 4 nm versus 3 nm. Foundry: TSMC versus Intel.

Cache configuration differs in both size and organization. AMD uses 80 KB L1 per core, 1 MB L2 per core, and 128 MB L3. Intel uses 192 KB L1 per core, 2.5 MB L2 per core, and 18 MB shared L3. Memory support: AMD lists DDR5, Intel lists DDR5 and LPDDR5X. Memory bandwidth: 89.6 GB/s versus 115.2 GB/s. ECC support: AMD yes, Intel no. PCIe: Gen 5 with 24 lanes versus Gen 5 with 12 lanes. Integrated graphics: Radeon Graphics versus Intel Xe3 Graphics. Market segment: Desktop versus Mobile. Multiplier: unlocked versus locked. Release date: January 5, 2025 versus January 4, 2026.

The AMD part has a recorded launch MSRP of $599; no launch MSRP is recorded for Intel. Transistor count only appears for AMD at 16,630 million; Intel's figure is not recorded. Die size only appears for AMD at 2x 70.6 mm²; Intel's is not recorded. Part numbers differ: 100-000001368 for AMD, SA4R9Q9EL for Intel.

FAQ

Q: Which processor has more cores and threads?

A: Intel Core Ultra 7 366H has more physical cores at 16 versus 12, but AMD Ryzen 9 9900X3D has more threads at 24 versus 16 due to simultaneous multithreading.

Q: What is the largest performance gap in the benchmark data?

A: The largest gap is in PassMark integer math, where AMD scores 179,727 versus 83,695, a 114.7% advantage. Data compression shows a 109.2% lead, and extended instructions show a 106% lead.

Q: Where does Intel come closest to matching AMD?

A: The smallest gaps appear in PassMark floating point math (15.4% lead for AMD) and PassMark single-thread (14.9% lead for AMD). Data encryption shows a 28.8% gap, the third-closest margin.

Q: How do the cache sizes compare?

A: AMD uses 80 KB L1 and 1 MB L2 per core with a 128 MB L3 cache. Intel uses 192 KB L1 and 2.5 MB L2 per core with an 18 MB shared L3 cache. AMD's L3 is substantially larger, while Intel has larger per-core L1 and L2.

Q: What are the clock speed and power differences?

A: AMD runs at 4.40 GHz base and 5.50 GHz boost with a 120 W TDP. Intel runs at 2.00 GHz base and 4.80 GHz boost with a 25 W TDP. The AMD part has a higher power envelope and higher clocks.

Q: Do both processors support the same memory types?

A: Both support DDR5, but Intel adds LPDDR5X support. AMD has higher memory bandwidth at 115.2 GB/s versus 89.6 GB/s for Intel. AMD supports ECC memory; Intel does not.