Between the M4 Ultra and Ryzen AI 9 HX 395+, the M4 Ultra comes out ahead in cores and cinebench r23 (multi), while the Ryzen AI 9 HX 395+ wins on tdp and boost clock. Overall, the M4 Ultra scores 63.1 and the Ryzen AI 9 HX 395+ scores 54.3 on our Mars Score.
Which should you buy?
The M4 Ultra is the clear pick on raw spec strength, leading by 8.8 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the M4 Ultra if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. The biggest gaps in its favor are cores, cinebench r23 (multi).
Pick the Ryzen AI 9 HX 395+ if you care most about tdp and boost clock. Its strongest claims are tdp, boost clock.
Both ship with comparable l3 cache, so those specs don't separate the two — focus on the differences below.
Bottom line: the M4 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Apple - M4 Ultra wins
- ▲Cores — 100.00% more. 32 vs 16.
- ▲Cinebench R23 (multi) — 91.27% more. 52600 vs 27500.
Why AMD - Ryzen AI 9 HX 395+ wins
- ▲TDP — 65.00 W less. 55 vs 120.
- ▲Boost clock — 13.33% more. 5.1 GHz vs 4.5 GHz.
Spec comparison
Cores
| Spec | Apple - M4 Ultra | AMD - Ryzen AI 9 HX 395+ |
|---|---|---|
| Coresⓘ | 32lead | 16 |
| Threadsⓘ | 32 | 32 |
| Base clockⓘ | 0 GHz | 3.0 GHzlead |
| Boost clockⓘ | 4.5 GHz | 5.1 GHzlead |
| L3 cacheⓘ | 64 MB | 64 MB |
Platform
| Spec | Apple - M4 Ultra | AMD - Ryzen AI 9 HX 395+ |
|---|---|---|
| Socketⓘ | Soldered | FP11 |
| TDPⓘ | 120 W | 55 Wlead |
| Integrated graphicsⓘ | true | true |
| DDR5ⓘ | true | true |
Benchmarks
| Spec | Apple - M4 Ultra | AMD - Ryzen AI 9 HX 395+ |
|---|---|---|
| Cinebench R23 (multi)ⓘ | 52600lead | 27500 |
| Cinebench R23 (single)ⓘ | 2290lead | 2050 |
Spec-level deep dives
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