9th Gen Intel Core i9-9900X
- Boost/Base Clock:
- 4.5 GHz / 3.5 GHz
- Core/Thread Count:
- 10 Core / 20 Thread
- Cache:
- 19.25MB L3 + 10MB L2 + 640KB L1
- TDP:
- 165 Watts
- CPU Process Node:
- 14 Nanometers
- CPU Socket:
- FCLGA2066
- CPU Series:
- Skylake-X
- Memory Support:
- DDR4-2666
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Manufacturer: Intel Last updated: September 9, 2026
Description
The 9th Gen Intel Core i9-9900X is a 10-core, 20-thread HEDT processor built on Skylake-X, running a 3.5 GHz base clock that boosts to 4.5 GHz within a 165 Watt TDP on the LGA2066 socket.
As the entry point into Intel's 9th Gen X-series HEDT lineup, this chip offered the platform's genuine quad-channel memory bandwidth and extensive PCIe lanes at a more accessible 10-core tier.
Platform
This HEDT chip requires an X299-series motherboard on the LGA2066 socket, typically paired with quad-channel memory for genuine workstation-scale bandwidth beyond mainstream desktop platforms.
How Is the Core i9-9900X in Terms of Performance
With 10 cores and 20 threads, this chip targets prosumer content-creation and workstation workloads, offering the HEDT platform's genuine memory bandwidth and PCIe lane advantages at a more accessible entry tier within the X-series stack.
Benchmarks
As a genuine 10-core Skylake-X HEDT chip with a strong 4.5 GHz boost ceiling, this processor delivers solid workstation-tier multi-threaded throughput, positioned as the accessible entry point into Intel's 9th Gen X-series HEDT lineup.
Specifications
| Form Factor | Server & Enthusiast |
|---|---|
| Brand | Intel |
| Series | Core i9 |
| Model Number | 9900X |
| Boost/Base Clock | 4.5 GHz / 3.5 GHz |
| Core/Thread Count | 10 Core / 20 Thread |
| Cache | 19.25MB L3 + 10MB L2 + 640KB L1 |
| TDP | 165 Watts |
| CPU Process Node | 14 Nanometers |
| CPU Socket | FCLGA2066 |
| CPU Series | Skylake-X, 9th Gen Intel Core |
| Memory Support | DDR4-2666, non-ECC (ECC not supported) |
Expert Review
Rated by the Consumercarts editorial team, not by users
Best for
- Prosumer content creators wanting HEDT platform memory bandwidth and PCIe lanes at a more accessible entry tier
Not for
- Buyers needing the highest core counts — the i9-9920X, 9940X, and higher-tier X-series chips offer more cores on the same platform