9th Gen Intel Core i9 9820X
- Boost/Base Clock:
- 4.2 GHz / 3.3 GHz
- Core/Thread Count:
- 10 Core / 20 Thread
- Cache:
- 16.5MB L3 + 10MB L2 + 640KB L1
- TDP:
- 165 Watts
- 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 9820X is a 10-core, 20-thread HEDT processor built on Skylake-X, running a 3.3 GHz base clock that boosts to 4.2 GHz within a 165 Watt TDP on the LGA2066 socket.
Sharing the same 10-core count as the 9900X but with a modestly lower boost ceiling, this chip offered a genuine alternate entry point into Intel's 9th Gen X-series HEDT stack.
Platform
This HEDT chip requires an X299-series motherboard on the LGA2066 socket, typically paired with quad-channel memory for genuine workstation-scale bandwidth.
How Is the Core i9 9820X in Terms of Performance
With 10 cores and 20 threads, this chip offers the HEDT platform's genuine memory bandwidth and PCIe lane advantages, sharing its core count with the 9900X at a modestly lower clock ceiling.
Benchmarks
As a genuine 10-core Skylake-X HEDT chip, this processor delivers solid workstation-tier multi-threaded throughput, tracking closely with the 9900X's core-count tier within Intel's 9th Gen X-series lineup.
Specifications
| Form Factor | Server & Enthusiast |
|---|---|
| Brand | Intel |
| Series | Core i9 |
| Model Number | 9820X |
| Boost/Base Clock | 4.2 GHz / 3.3 GHz |
| Core/Thread Count | 10 Core / 20 Thread |
| Cache | 16.5MB L3 + 10MB L2 + 640KB L1 |
| TDP | 165 Watts |
| 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 genuine 10-core HEDT platform capability
Not for
- Buyers needing the highest core counts — the 9920X and 9960X offer more on the same platform