Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - M5 Ultra | AMD - Ryzen 7 9800X3D |
|---|---|---|
| Cores | 36 | 8 |
| TDP | 120 W | |
| Boost clock | 5.2 GHz | |
| L3 cache | 96 MB | |
| Cinebench R23 (multi) | 23500 |
Between the M5 Ultra and Ryzen 7 9800X3D, the M5 Ultra comes out ahead in cores / tdp, while the Ryzen 7 9800X3D wins on boost clock / l3 cache. Overall, the M5 Ultra scores 53.5 and the Ryzen 7 9800X3D scores 52.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (53.5 vs 52.4). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the M5 Ultra if you care most about cores / tdp. The biggest gaps in its favor are cores, tdp. The single most decisive one: Cores — 350.00% more. 36 vs 8.
Pick the Ryzen 7 9800X3D if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. Its strongest claims are boost clock, l3 cache, cinebench r23 (multi). The single most decisive one: Boost clock: 5.2 GHz vs GHz.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Apple - M5 Ultra or AMD - Ryzen 7 9800X3D?
Apple - M5 Ultra leads the current Mars Score by 1.1 points.The more useful decision is the trade-off behind that result: compare cores, boost clock, tdp against the way you will actually use the product.
Choose Apple - M5 Ultra if…
Apple - M5 Ultra has the measurable edge on core count, tdp w.
Choose AMD - Ryzen 7 9800X3D if…
AMD - Ryzen 7 9800X3D has the measurable edge on boost clock ghz, cache l3 mb, cinebench r23 multi.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Apple - M5 Ultra wins
- ▲Cores — 350.00% more. 36 vs 8.
- ▲TDP — 120.00 W less. vs 120.
Why AMD - Ryzen 7 9800X3D wins
- ▲Boost clock: 5.2 GHz vs GHz.
- ▲L3 cache: 96 MB vs MB.
- ▲Cinebench R23 (multi): 23500 vs .
Spec comparison
Cores
| Spec | Apple - M5 Ultra | AMD - Ryzen 7 9800X3D |
|---|---|---|
| Coresⓘ | 36lead | 8 |
| Threadsⓘ | 36lead | 16 |
| Base clockⓘ | 4.7 GHzlead | |
| Boost clockⓘ | 5.2 GHzlead | |
| L3 cacheⓘ | 96 MBlead |
Platform
| Spec | Apple - M5 Ultra | AMD - Ryzen 7 9800X3D |
|---|---|---|
| Socketⓘ | Soldered | AM5 |
| TDPⓘ | lead | 120 W |
| Integrated graphicsⓘ | true | true |
| DDR5ⓘ | true | true |
Benchmarks
| Spec | Apple - M5 Ultra | AMD - Ryzen 7 9800X3D |
|---|---|---|
| Cinebench R23 (multi)ⓘ | 23500lead | |
| Cinebench R23 (single)ⓘ | 2150lead |