Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Intel - Core Ultra 5 245K | AMD - Ryzen 9 7900X |
|---|---|---|
| L3 cache | 24 MB | 64 MB |
| TDP | 125 W | 170 W |
| Cores | 14 | 12 |
| Cinebench R23 (multi) | 25400 | 29600 |
| Boost clock | 5.2 GHz | 5.6 GHz |
Between the Core Ultra 5 245K and Ryzen 9 7900X, the Core Ultra 5 245K comes out ahead in tdp / cores, while the Ryzen 9 7900X wins on l3 cache / cinebench r23 (multi). Overall, the Core Ultra 5 245K scores 51.9 and the Ryzen 9 7900X scores 55.6 on our Mars Score.
Which should you buy?
The Ryzen 9 7900X edges ahead on the Mars Score (51.9 vs 55.6), but the 3.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Core Ultra 5 245K if you care most about tdp / cores. The biggest gaps in its favor are tdp, cores. The single most decisive one: TDP — 45.00 W less. 125 vs 170.
Pick the Ryzen 9 7900X 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 l3 cache, cinebench r23 (multi), boost clock. The single most decisive one: L3 cache — 166.67% more. 64 MB vs 24 MB.
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: Intel - Core Ultra 5 245K or AMD - Ryzen 9 7900X?
AMD - Ryzen 9 7900X leads the current Mars Score by 3.7 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 Intel - Core Ultra 5 245K if…
Intel - Core Ultra 5 245K has the measurable edge on tdp w, core count.
Choose AMD - Ryzen 9 7900X if…
AMD - Ryzen 9 7900X has the measurable edge on cache l3 mb, cinebench r23 multi, boost clock ghz.
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 Intel - Core Ultra 5 245K wins
- ▲TDP — 45.00 W less. 125 vs 170.
- ▲Cores — 16.67% more. 14 vs 12.
Why AMD - Ryzen 9 7900X wins
- ▲L3 cache — 166.67% more. 64 MB vs 24 MB.
- ▲Cinebench R23 (multi) — 16.54% more. 29600 vs 25400.
- ▲Boost clock — 7.69% more. 5.6 GHz vs 5.2 GHz.
Spec comparison
Cores
| Spec | Intel - Core Ultra 5 245K | AMD - Ryzen 9 7900X |
|---|---|---|
| Coresⓘ | 14lead | 12 |
| Threadsⓘ | 14 | 24lead |
| Base clockⓘ | 4.2 GHz | 4.7 GHzlead |
| Boost clockⓘ | 5.2 GHz | 5.6 GHzlead |
| L3 cacheⓘ | 24 MB | 64 MBlead |
Platform
| Spec | Intel - Core Ultra 5 245K | AMD - Ryzen 9 7900X |
|---|---|---|
| Socketⓘ | LGA1851 | AM5 |
| TDPⓘ | 125 Wlead | 170 W |
| Integrated graphicsⓘ | true | true |
| DDR5ⓘ | true | true |
Benchmarks
| Spec | Intel - Core Ultra 5 245K | AMD - Ryzen 9 7900X |
|---|---|---|
| Cinebench R23 (multi)ⓘ | 25400 | 29600lead |
| Cinebench R23 (single)ⓘ | 2080lead | 2030 |