Intel Xeon Silver 4509Y socket: LGA 4677
The Intel Xeon Silver 4509Y uses LGA 4677, the 4677-contact LGA socket for Sapphire Rapids server processors. The 8-core chip at 125 W needs a server board with DDR5 memory.
- Socket
- LGA 4677
- Launched
- December 2023
- Cores and threads
- 8 and 16
- Base power
- 125 W
- Codename
- Sapphire Rapids
- Segment
- Server
- Family
- Intel Xeon Silver
- Clocks
- 2.6 / 4.1 GHz
Intel Xeon Silver 4509Y specifications
| Cores | 8 |
|---|---|
| Threads | 16 |
| Core architecture | Golden Cove (Sapphire Rapids) |
| Clocks | 2.6 GHz base, up to 4.1 GHz turbo |
| Cache | 22.5 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 125 W |
| Manufacturing process | Intel 7 |
| Memory support | DDR5 to 4800 MT/s, 8 channels |
| PCI Express | 80 PCIe Gen5 lanes with Flex Bus and CXL per CPU |
| UPI links | 2 at 16 GT/s |
| Multiplier | Locked |
| Package | LGA 4677 |
| Cooler in the box | None (server heatsink required) |
| Launch price | $676.00 Intel recommended customer price |
Motherboard and chipset compatibility
Intel Xeon Silver 4509Y needs a motherboard with a LGA 4677 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| W790 workstation | W790 | Works out of the box |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for LGA 4677.
LGA 4677 at a glance
| Type | LGA, 4,677 contacts |
|---|---|
| Package size | 77.5 × 56.5 mm |
| Introduced | 2023 |
| Memory | DDR5-4800 Registered DIMMs with ECC, 8 channels up to 4 TB on W-3500 and W-3400, 4 channels on W-2500 and W-2400 |
| Cooler mounting holes | Board specific (workstation heatsink) |
What the Xeon Silver 4509Y is
The Xeon Silver 4509Y is the 8-core speed-select member of the late 2023 Silver refresh for LGA 4677 boards from the fourth quarter of 2023. Eight Golden Cove cores with hyperthreading give 8 cores and 16 threads, with base at 2.6 GHz and up to 4.1 GHz turbo. The package carries 22.5 MB of Smart Cache. The 125 W envelope suits single and dual socket mainstream servers with profile-tuned clocks. ARK files it under the 5th Gen Xeon Scalable collection while the codename field says Sapphire Rapids, so this page follows the master list codename.
Speed Select profiles trade cores for clocks within the SKU, with 8-core and 4-core configs at lower power. Eight channels of DDR5 feed 8 cores for storage and gateway duty. Eighty Gen5 lanes with Flex Bus and CXL serve NICs and NVMe across sockets.
Mainstream buyers land here for 8 fast threads with profile flexibility at 125 W. Mixed storage plus application tasks fit well, while 12-core Silver parts suit denser hosts. Server boards need C741 class chipsets with the Silver SKU on the CPU list, not W790 workstation boards. The Socket vs chipset: what decides whether a CPU works guide covers server board choice.
Socket and motherboard compatibility
The 4509Y fits LGA 4677 on single and dual socket server boards with LGA 4677 retention and server power delivery. Two UPI links at 16 GT/s enable dual socket pairing. W790 workstation boards target W-series chips instead.
Server chipset choice decides management and IO breadth rather than CPU fit. Speed Select profiles are set in firmware per deployment.
Memory, PCIe and cooling
DDR5 to 4800 MT/s in 8 channels feeds 8 cores for storage duty. Population with matched DIMMs holds rated speed.
Eighty Gen5 lanes with Flex Bus and CXL per CPU wire NICs, accelerators and NVMe. Cooling is a 125 W server heatsink with front-to-back airflow.
Upgrade paths
On LGA 4677 the upward moves are higher-core Silver parts where VM counts grow, or adding a second 4509Y socket where boards allow 2P. Memory growth and NIC additions often help more than cores.
Outside mainstream Silver, Bronze parts on LGA 4677 trim cost for lighter loads.
Frequently asked questions
What socket does the Xeon Silver 4509Y use?
LGA 4677 on single and dual socket server boards.
What does Y mean on the 4509Y?
Speed Select performance profiles that trade active cores for clocks within the same SKU.
Is the 4509Y Sapphire Rapids or Emerald Rapids?
ARK files it under 5th Gen collection with a Sapphire Rapids codename field; this page follows the master list codename Sapphire Rapids.
Can the 4509Y run in dual socket?
Yes, two UPI links at 16 GT/s enable dual socket pairing.
Sources and verification
Facts last checked against these sources on . Page last edited on .