Intel Core i9-11900K socket: LGA 1200
The Intel Core i9-11900K uses the LGA 1200 socket. It is the 8-core Rocket Lake flagship with PCIe 4.0 from the CPU, running on 500 series boards and on selected 400 series boards after a BIOS update.
- Socket
- LGA 1200
- Launched
- March 30, 2021
- Cores and threads
- 8 and 16
- Base power
- 125 W
- Codename
- Rocket Lake
- Segment
- Desktop
- Family
- Intel Core i9
- Clocks
- 3.5 / 5.3 GHz
Intel Core i9-11900K specifications
| Cores | 8 |
|---|---|
| Threads | 16 |
| Core architecture | Cypress Cove |
| Clocks | 3.5 GHz base, up to 5.1 GHz (Turbo Boost 2.0), 5.2 GHz (Turbo Boost Max 3.0), 5.3 GHz (Thermal Velocity Boost) |
| Cache | 16 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 125 W |
| Maximum turbo power | 251 W |
| Manufacturing process | 14 nm |
| Memory support | DDR4 up to 3200 MT/s, two channels, up to 128 GB |
| PCI Express | 20 lanes from the CPU: PCIe 4.0 x16 plus PCIe 4.0 x4 |
| Integrated graphics | Intel UHD Graphics 750 (32 execution units, up to 1.30 GHz) |
| Multiplier | Unlocked (K series) |
| Package | FCLGA1200 |
| Cooler in the box | None |
| Launch price | $539 (Intel RCP) |
Motherboard and chipset compatibility
Intel Core i9-11900K needs a motherboard with a LGA 1200 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 500 series | Z590, H570, B560, H510, Q570, W580 | Works out of the box |
| 400 series: Z490, H470, Q470, W480 | Z490, H470, Q470, W480 | Needs a BIOS update Needs a BIOS update from the board maker. PCIe 4.0 depends on how the board is wired. |
| 400 series: B460, H410 | B460, H410 | Not supported |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for LGA 1200.
Recommended GPU pairing
| Recommended tier | High-end 1440p |
|---|---|
| Example GPUs | GeForce RTX 3080, Radeon RX 6800 XT |
| Target resolution | 1440p high settings |
Eight cores with boost to 5.3 GHz, 20 PCIe 4.0 lanes and DDR4 match high-end 1440p cards from early 2021. A faster card still works and the balance shifts with game, settings and resolution.
This is a rough match for a new build at the stated resolution, not a limit. A faster card still works and helps at higher resolutions or in games that load the GPU more than the CPU. A slower card is fine for lighter games and office use. The exact balance shifts with the game, the settings and the resolution, so no percentage is given.
LGA 1200 at a glance
| Type | LGA, 1,200 contacts |
|---|---|
| Package size | 37.5 × 37.5 mm |
| Introduced | April 2020 |
| Memory | DDR4 only |
| Cooler mounting holes | 75 × 75 mm |
What the Core i9-11900K is
The Core i9-11900K is an eight core, sixteen thread processor that Intel released in March 2021 at the top of the 11th Gen Rocket Lake range. Its Cypress Cove cores run 3.5 GHz base to 5.1 GHz turbo with Turbo Boost 2.0, reaching 5.2 GHz with Turbo Boost Max 3.0 and 5.3 GHz with Thermal Velocity Boost, with up to 4.8 GHz across all cores. Cache is 16 MB of shared L3.
Rocket Lake raised instructions per cycle over the prior generation but dropped the flagship core count from ten to eight, which split reviews: faster in lightly threaded work, behind in heavy rendering. Intel rates the TDP at 125 W with maximum turbo power at 251 W. The process is 14 nm.
Intel UHD Graphics 750 cover display output, with 32 execution units at up to 1.30 GHz on the Xe architecture. The multiplier is unlocked. The launch price was $539 (Intel RCP). Intel includes no cooler with K-series processors.
Socket and motherboard compatibility
The 11900K fits the LGA 1200 socket. Boards with 500 series chipsets (Z590, H570, B560, H510, Q570, W580) accept it with the shipping BIOS. Among 400 series boards, only Z490, H470, Q470 and W480 can run it, and only after a BIOS update. B460 and H410 boards never support it.
A Z590 or updated Z490 board is the expected match: multiplier overclocking needs a Z-series chipset, and memory tuning is widest there. B560 allows memory overclocking without CPU overclocking.
Check the board maker's CPU support list for the minimum BIOS version. Power delivery matters at 251 W peaks, so budget boards can limit sustained boost.
Memory, PCIe and cooling
The memory controller supports DDR4 up to 3200 MT/s only. Two channels carry up to 128 GB. Faster kits run through XMP profiles, which count as overclocking from the processor's point of view.
The CPU supplies 20 PCIe 4.0 lanes: x16 for graphics, configurable as x16, x8 plus x4 arrangements, plus x4 for storage. Rocket Lake was the first Intel desktop generation with PCIe 4.0, but the board must be wired for it, so check the specifications when Gen 4 storage matters.
Cooling should target the 251 W ceiling rather than the 125 W base. A large air cooler or liquid cooler is realistic. Mounting uses the 75 mm LGA 1200 pattern shared with older Intel sockets, covered in the CPU cooler compatibility by socket guide.
PCIe 4.0 arrives, with steep power draw
Two traits set Rocket Lake apart on the platform. PCIe 4.0 arrives from the processor for the first time, doubling graphics and storage link speeds over Comet Lake, but only on boards wired for it. Adaptive Boost also pushes multi-core turbo past rated frequencies within power and thermal budgets on the K chips.
Power behavior is the other trait. Short boosts draw near 250 W, so sustained all-core work needs cooling and board power stages sized for it. Configurable TDP-down to 95 W exists for constrained builds at reduced clocks.
Upgrade paths
On the socket the 11900K sits above the Intel Core i7-11700K, which shares its core count and cache with lower clocks for less money. The 10th Gen Comet Lake flagships on the same socket offer more cores for threaded work but no PCIe 4.0.
Moving to LGA 1700 needs a new board, new memory for DDR5 builds, and a new cooler bracket. The 11900K fits an existing LGA 1200 board that already has the right chipset and BIOS.
Frequently asked questions
What socket does the Intel Core i9-11900K use?
It uses LGA 1200, written FCLGA1200 in Intel's documents.
What is the difference between the 11900K and the 11900KF?
The KF has no integrated graphics and needs a separate card. Cores, clocks, cache and power match the K.
Does the 11900K run in a Z490 motherboard?
Yes, after a BIOS update that adds Rocket Lake support. B460 and H410 boards never support it, whatever the BIOS.
Does the 11900K work with DDR5 memory?
No. LGA 1200 is a DDR4 platform. DDR5 arrived with LGA 1700.
Does the 11900K come with a cooler?
No. Intel ships K-series processors without a cooler, and 251 W peaks need a large air cooler or liquid cooler.
Sources and verification
- Intel Core i9-11900K specifications (Intel)
- Intel Core i9-11900K benchmarks and specs (Notebookcheck)
Facts last checked against these sources on . Page last edited on .