# Sierra Forest

Sierra Forest is the codename for sixth generation Xeon Scalable server processors designed by Intel, launched in June 2024. It is the first generation of Xeon processors to exclusively feature density-optimized E-cores. Sierra Forest processors are targeted towards cloud server customers with up to 288 Crestmont E-cores.

## Background

On February 17, 2022, Intel announced that upcoming Xeon generations would be split into two tracks for those with P-cores exclusively and E-cores exclusively. These two tracks are intended to serve different market segments with P-core Xeon processors targeting high-performance computing while E-core Xeon processors target cloud customers who prioritize greater core density, energy efficiency and performance in heavily multi-threaded workloads over strong single-threaded usage.
On March 29, 2023, Intel announced that Sierra Forest processors had powered on and displayed a processor running 144 E-cores, and announced a release timeline for H1 2024. On September 19, 2023, Intel announced at their Innovation event that a 288-core variant of Sierra Forest would be coming.
On June 3, 2024, Intel released the Sierra Forest-SP line of SKUs, also known as the Xeon 6700E series. This product line included seven SKUs at launch, all using the LGA 4710 socket. The low-end SKU has 64 cores, and the high-end SKU has 144 cores.

### Branding

During Intel's Vision event in April 2024, new branding for Xeon processors was unveiled. The Xeon Scalable branding that was introduced in 2017 would be retired in favor of a simplified "Xeon 6" brand for sixth generation Xeon processors. This change brings greater emphasis on processor generation numbers. The badge for the Xeon brand was changed to be more visually in line with the badge design used for Intel's Core Ultra processors since 2023.

## Architecture

Sierra Forest will use only E-cores to achieve higher core counts in order to compete with AMD's Epyc server processors codenamed Bergamo which features up to 128 smaller Zen 4c cores. AMD's Zen 4c cores feature simultaneous multithreading (SMT) while the Crestmont E-cores featured in Sierra Forest processors can only support one thread for each core. The purpose of the Sierra Forest architecture design is to achieve ultra-high core counts for greater compute density that would benefit cloud and HPC server applications. Cloud service providers may not be as interested in HPC accelerators and instead prioritize greater ECU/vCPU integer and floating-point performance. Don Soltis is the principal engineer and chief architect for Xeon E-Core.

## Products
### Sierra Forest-SP

Sierra Forest-SP (Scalable Performance) uses the Beechnut City platform with the smaller LGA 4710 socket, targeted towards mainstream server. Sierra Forest-SP features up to 144 E-cores and eight-channel DDR5 memory support. TDPs up to 350W are supported on Beechnut City platform.
| SKU | Cores (threads) | Tiles | Core config | Clock rate (GHz) | Clock rate (GHz) | Cache | Cache | Cache | Socket | Socket Count | PCIe lanes | Memory support | TDP | Release date | Price (USD) |
| SKU | Cores (threads) | Tiles | Core config | Base | Turbo | L1 | L2 | L3 | Socket | Socket Count | PCIe lanes | Memory support | TDP | Release date | Price (USD) |
| 6710E | 64 (64) | 1 × Compute 2 × I/O | 1 × 64 | 2.4 | 3.2 | 6 MB | 64 MB | 96 MB | LGA 4710 | 2S | 88 PCIe 5.0 | DDR5-5600 eight-channel | 205 W | Jun 4, 2024 | $2,199 |
| 6731E | 96 (96) | 1 × Compute 2 × I/O | 1 × 96 | 2.2 | 3.1 | 9 MB | 96 MB | 96 MB | LGA 4710 | 1S | 88 PCIe 5.0 | DDR5-5600 eight-channel | 250 W | Jun 4, 2024 | $3,297 |
| 6740E | 96 (96) | 1 × Compute 2 × I/O | 1 × 96 | 2.4 | 3.2 | 9 MB | 96 MB | 96 MB | LGA 4710 | 2S | 88 PCIe 5.0 | DDR5-6400 eight-channel | 250 W | Jun 4, 2024 | $3,949 |
| 6746E | 112 (112) | 1 × Compute 2 × I/O | 1 × 112 | 2.0 | 2.7 | 10.5 MB | 112 MB | 96 MB | LGA 4710 | 2S | 88 PCIe 5.0 | DDR5-5600 eight-channel | 250 W | Jun 4, 2024 | $4,447 |
| 6756E | 128 (128) | 1 × Compute 2 × I/O | 1 × 128 | 1.8 | 2.6 | 12 MB | 128 MB | 96 MB | LGA 4710 | 2S | 88 PCIe 5.0 | DDR5-6400 eight-channel | 225 W | Jun 4, 2024 | $6,320 |
| 6766E | 144 (144) | 1 × Compute 2 × I/O | 1 × 144 | 1.9 | 2.7 | 13.5 MB | 144 MB | 108 MB | LGA 4710 | 2S | 88 PCIe 5.0 | DDR5-6400 eight-channel | 250 W | Jun 4, 2024 | $7,692 |
| 6780E | 144 (144) | 1 × Compute 2 × I/O | 1 × 144 | 2.2 | 3.0 | 13.5 MB | 144 MB | 108 MB | LGA 4710 | 2S | 88 PCIe 5.0 | DDR5-6400 eight-channel | 330 W | Jun 4, 2024 | $8,513 |
* ↑ Number of compute tiles × cores per compute tile
* ↑ Price is Recommended Customer Price (RCP) at February 27, 2025. RCP is the trade price that processors are sold by Intel to retailers and OEMs. Actual MSRP for consumers is higher.

### Sierra Forest-AP

Sierra Forest-AP uses the Avenue City platform with the larger LGA 7529 socket for higher core count SKUs up to 288. It supports a higher number PCIe lanes and 12-channel DDR5 memory.