# LGA 2066

LGA 2066, also called Socket R4, is a CPU socket by Intel that debuted with Skylake-X and Kaby Lake-X processors in June 2017. It replaces Intel's LGA 2011-3 (R3) in the performance, high-end desktop and Workstation platforms (based on the X299 "Basin Falls" and C422 chipsets), while LGA 3647 (Socket P) replaces LGA 2011-3 (R3) in the server platforms based on Skylake-SP (Xeon "Purley").

## Compatible processors
### High-End Desktop (HEDT)

All of these CPUs require the Intel X299 chipset to work. So, the C422 chipset is strictly limited to work with workstation processors only.

#### Kaby Lake-X

Kaby Lake-X processors were discontinued in May 2018. Starting October 2019, BIOS updates for most of the X299-based motherboards removed support for Kaby Lake-X processors.
| Name | Cores (threads) | Base Clock | Turbo Boost 2.0 | Turbo Boost 2.0 | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Name | Cores (threads) | Base Clock | Single core | All cores | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Core i5-7640X | 04 (4) | 4.0 GHz | 4.2 GHz | 4.0 GHz | — | 2 × DDR4-2666 up to 64 GB | 0256 KB per core | 06 | 16 | 112 W | Q2'17 | 0$242 |
| Core i7-7740X | 04 (8) | 4.3 GHz | 4.5 GHz | 4.5 GHz | — | 2 × DDR4-2666 up to 64 GB | 0256 KB per core | 08 | 16 | 112 W | Q2'17 | 0$339 |

#### Skylake-X 7000-series

| Name | Cores (threads) | Base Clock | Turbo Boost 2.0 | Turbo Boost 2.0 | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Name | Cores (threads) | Base Clock | Single core | All cores | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Core i7-7800X | 06 (12) | 3.5 GHz | 4.0 GHz | 4.0 GHz | N/A | 4 × DDR4-2400 up to 128 GB | 1 MB per core | 08.25 | 28 | 140 W | Q2'17 | 0$389 |
| Core i7-7820X | 08 (16) | 3.6 GHz | 4.3 GHz | 4.0 GHz | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 11 | 28 | 140 W | Q2'17 | 0$599 |
| Core i9-7900X | 10 (20) | 3.3 GHz | 4.3 GHz | 4.0 GHz | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 13.75 | 44 | 140 W | Q2'17 | 0$999 |
| Core i9-7920X | 12 (24) | 2.9 GHz | 4.3 GHz | 3.8 GHz | 4.4 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 16.5 | 44 | 140 W | Q3'17 | $1199 |
| Core i9-7940X | 14 (28) | 3.1 GHz | 4.3 GHz | 3.8 GHz | 4.4 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 19.25 | 44 | 165 W | Q3'17 | $1399 |
| Core i9-7960X | 16 (32) | 2.8 GHz | 4.2 GHz | 3.6 GHz | 4.4 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 22 | 44 | 165 W | Q3'17 | $1699 |
| Core i9-7980XE | 18 (36) | 2.6 GHz | 4.2 GHz | 3.4 GHz | 4.4 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 24.75 | 44 | 165 W | Q3'17 | $1999 |

#### Skylake-X 9000-series

| Name | Cores (threads) | Base Clock | Turbo Boost 2.0 | Turbo Boost 2.0 | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Name | Cores (threads) | Base Clock | Single core | All cores | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Core i7-9800X | 8 (16) | 3.8 GHz | 4.4 GHz | | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 16.5 | 44 | 165 W | Q4'18 | $589 |
| Core i9-9820X | 10 (20) | 3.3 GHz | 4.1 GHz | | 4.2 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 16.5 | 44 | 165 W | Q4'18 | $889 |
| Core i9-9900X | 10 (20) | 3.5 GHz | 4.4 GHz | | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 19.25 | 44 | 165 W | Q4'18 | $989 |
| Core i9-9920X | 12 (24) | 3.5 GHz | 4.4 GHz | | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 19.25 | 44 | 165 W | Q4'18 | $1189 |
| Core i9-9940X | 14 (28) | 3.3 GHz | 4.4 GHz | | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 19.25 | 44 | 165 W | Q4'18 | $1387 |
| Core i9-9960X | 16 (32) | 3.1 GHz | 4.4 GHz | | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 22 | 44 | 165 W | Q4'18 | $1684 |
| Core i9-9980XE | 18 (36) | 3.0 GHz | 4.4 GHz | 3.8 GHz | 4.5 GHz | 4 × DDR4-2666 up to 128 GB | 1 MB per core | 24.75 | 44 | 165 W | Q4'18 | $1999 |

#### Cascade Lake-X

| Name | Cores (threads) | Base Clock | Turbo Boost 2.0 | Turbo Boost 2.0 | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Name | Cores (threads) | Base Clock | Single core | All cores | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Core i9-10900X | 10 (20) | 3.7 GHz | 4.5 GHz | 4.3 GHz | 4.7 GHz | 4 × DDR4-2933 up to 256 GB | 1 MB per core | 19.25 | 48 | 165W | Q4'19 | $599 |
| Core i9-10920X | 12 (24) | 3.5 GHz | 4.6 GHz | 4.3 GHz | 4.8 GHz | 4 × DDR4-2933 up to 256 GB | 1 MB per core | 19.25 | 48 | 165W | Q4'19 | $700 |
| Core i9-10940X | 14 (28) | 3.3 GHz | 4.6 GHz | 4.1 GHz | 4.8 GHz | 4 × DDR4-2933 up to 256 GB | 1 MB per core | 19.25 | 48 | 165W | Q4'19 | $797 |
| Core i9-10980XE | 18 (36) | 3.0 GHz | 4.6 GHz | 3.8 GHz | 4.8 GHz | 4 × DDR4-2933 up to 256 GB | 1 MB per core | 24.75 | 48 | 165W | Q4'19 | $1000 |

### Workstation

Take note that certain types of Xeon processors will not work on this socket, like Skylake-P. There are four OEM variants that can be found in Apple Mac Pro: W-2140B and W-2150B (lower freq/TDP than their W-21x5 counterparts), W-2170B and W-2191B lack Trusted_Execution_Technology (TXT) in comparison.

#### Skylake-W

| Name | Cores (threads) | Base Clock | Turbo Boost 2.0 | Turbo Boost 2.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Name | Cores (threads) | Base Clock | Single core | All cores | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Xeon W‑2102 | 04 (4) | 2.9 GHz | N/A | N/A | 4 x DDR4‑2400 up to 512 GB | 1 MB per core | 08.25 | 48 | 120 W | Q3'17 | $202 |
| Xeon W‑2104 | 04 (4) | 3.2 GHz | N/A | N/A | 4 x DDR4‑2400 up to 512 GB | 1 MB per core | 08.25 | 48 | 120 W | Q3'17 | $255 |
| Xeon W‑2123 | 04 (8) | 3.6 GHz | 3.9 GHz | 3.7 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 08.25 | 48 | 120 W | Q3'17 | $294 |
| Xeon W‑2125 | 04 (8) | 4.0 GHz | 4.5 GHz | 4.4 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 08.25 | 48 | 120 W | Q3'17 | $444 |
| Xeon W‑2133 | 06 (12) | 3.6 GHz | 3.9 GHz | 3.8 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 08.25 | 48 | 140 W | Q3'17 | $617 |
| Xeon W‑2135 | 06 (12) | 3.7 GHz | 4.5 GHz | 4.4 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 08.25 | 48 | 140 W | Q3'17 | $835 |
| Xeon W‑2140B* | 08 (16) | 3.2 GHz | 4.2 GHz | 3.8 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 11 | 48 | 120 W | Q3'17 | N/A |
| Xeon W‑2145 | 08 (16) | 3.7 GHz | 4.5 GHz | 4.3 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 11 | 48 | 140 W | Q3'17 | $1113 |
| Xeon W‑2155 | 10 (20) | 3.3 GHz | 4.5 GHz | 4.0 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 13.75 | 48 | 140 W | Q4'17 | $1440 |
| Xeon W‑2175 | 14 (28) | 2.5 GHz | 4.3 GHz | 3.3 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 19.25 | 48 | 140 W | Q4'17 | $1950 |
| Xeon W‑2195 | 18 (36) | 2.3 GHz | 4.3 GHz | 3.2 GHz | 4 × DDR4‑2666 up to 512 GB | 1 MB per core | 24.75 | 48 | 140 W | Q3'17 | $2553 |
(* = OEM CPU found in Apple Mac Pro with lower TDP)

#### Cascade Lake-W

| Name | Cores (threads) | Base Clock | Turbo Boost 2.0 | Turbo Boost 2.0 | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Name | Cores (threads) | Base Clock | Single core | All cores | Turbo Boost 3.0 | Memory support | L2 cache | L3 cache (MB) | PCIe 3.0 lanes | TDP | Release date | Price (USD) |
| Xeon W-2223 | 4 (8) | 3.6 GHz | 3.9 GHz | 3.7 GHz | N/A | 4 × DDR4‑2666 up to 1 TB | 1 MB per core | 8.25 | 48 | 120 W | Q4'19 | $297 |
| Xeon W-2225 | 4 (8) | 4.1 GHz | 4.6 GHz | 4.5 GHz | N/A | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 8.25 | 48 | 105 W | Q4'19 | $444 |
| Xeon W-2235 | 6 (12) | 3.8 GHz | 4.6 GHz | 4.3 GHz | N/A | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 8.25 | 48 | 130 W | Q4'19 | $555 |
| Xeon W-2245 | 8 (16) | 3.9 GHz | 4.5 GHz | 4.5 GHz | 4.7 GHz | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 16.5 | 48 | 155 W | Q4'19 | $667 |
| Xeon W-2255 | 10 (20) | 3.7 GHz | 4.5 GHz | 4.3 GHz | 4.7 GHz | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 19.25 | 48 | 165 W | Q4'19 | $778 |
| Xeon W-2265 | 12 (24) | 3.5 GHz | 4.6 GHz | 4.3 GHz | 4.8 GHz | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 19.25 | 48 | 165 W | Q4'19 | $944 |
| Xeon W-2275 | 14 (28) | 3.3 GHz | 4.6 GHz | 4.1 GHz | 4.8 GHz | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 19.25 | 48 | 165 W | Q4'19 | $1112 |
| Xeon W-2295 | 18 (36) | 3.0 GHz | 4.6 GHz | 3.8 GHz | 4.8 GHz | 4 x DDR4-2933 up to 1 TB | 1 MB per core | 24.75 | 48 | 165 W | Q4'19 | $1333 |