Intel Xeon w7-3555 socket: LGA 4677
The Intel Xeon w7-3555 uses LGA 4677, the LGA workstation socket for Sapphire Rapids Xeon W with W790 chipsets, DDR5 RDIMM memory and 112 PCIe Gen5 lanes. The 28-core chip at 325 W suits expert workstation boards.
- Socket
- LGA 4677
- Launched
- August 2024
- Cores and threads
- 28 and 56
- Base power
- 325 W
- Codename
- Sapphire Rapids
- Segment
- Workstation
- Family
- Intel Xeon W
- Clocks
- 2.7 / 4.8 GHz
Intel Xeon w7-3555 specifications
| Cores | 28 |
|---|---|
| Threads | 56 |
| Core architecture | Golden Cove (P-cores only, chiplet) |
| Clocks | 2.7 GHz base, up to 4.8 GHz boost |
| Cache | 75 MB Intel Smart Cache |
| Processor base power (TDP) | 325 W |
| Manufacturing process | Intel 7 (10 nm) |
| Memory support | DDR5-4800 RDIMM with ECC, 8 channels, up to 4 TB |
| PCI Express | PCIe 5.0 x112 |
| Integrated graphics | None |
| Multiplier | Locked |
| ECC memory | Yes |
| Package | FCLGA4677 (77.5 by 56.5 mm) |
Motherboard and chipset compatibility
Intel Xeon w7-3555 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 w7-3555 is
The Xeon w7-3555 is a 28-core and 56-thread workstation processor that launched in August 2024 as the Sapphire Rapids-112L refresh for expert workstations. Twenty-eight Golden Cove Performance-cores with Hyper-Threading and no Efficient-cores give 56 threads at 2.7 GHz base and up to 4.8 GHz boost. Cache is 75 MB of Smart Cache. Processor base power is 325 W, which needs workstation air or liquid cooling.
Eight-channel DDR5-4800 RDIMM up to 4 TB with ECC feeds 28 cores plus GPUs from board memory. Up to 112 Gen5 lanes serve multiple GPUs and NVMe RAID from one socket. The 75 MB cache holds scenes close across many threads.
Expert CAD and rendering nodes fit here. Twenty-eight cores keep large assemblies plus builds together. Buyers who need 32 cores for larger scenes should take the Intel Xeon w7-3565X with 82.5 MB cache instead, since this w7 balances threads with base clocks.
Socket and motherboard compatibility
The w7-3555 fits LGA 4677 on W790 expert boards with 325 W delivery. Boards accept W-3400 plus W-3500 refresh SKUs with a BIOS that lists the part. The 77.5 by 56.5 mm FCLGA4677 package uses the E1A carrier.
Memory is DDR5-4800 RDIMM with ECC in 8 channels up to 4 TB. Locked multiplier keeps tuning to power limits. Population is 1 DIMM per channel at 4800 MT per s or 2 per channel at 4400 MT per s.
Expert shoppers compare W-3500 28-core and 32-core parts on cache and turbo. The w7-3555 trails on threads. The Socket vs chipset: what decides whether a CPU works guide explains vendor lists.
Memory, PCIe and cooling
DDR5-4800 RDIMM with ECC in 8 channels up to 4 TB is the W-3500 standard. Scenes plus datasets should be sized together. Matched octets are preferred.
PCIe gives 112 Gen5 lanes from the CPU plus 28 chipset lanes for multi-GPU, NVMe and 10 GbE. Splits serve dual GPUs plus RAID on expert boards.
Cooling is workstation 325 W with vendor-qualified air or liquid. No retail cooler ships with tray supply.
Upgrade paths
LGA allows expert moves within the vendor list, such as to 32-core W-3500 with stronger cooling. Memory and NVMe can also grow. BIOS must support the target.
The mainstream alternative is 4-channel W-2500 for lower cost. A working w7-3555 serves expert desks for years.
Frequently asked questions
What socket does the Xeon w7-3555 use?
It uses LGA 4677 on W790 expert workstation boards. A BIOS that lists the refresh is required.
How many cores does the Xeon w7-3555 have?
Twenty-eight cores and 56 threads at 2.7 GHz base and up to 4.8 GHz boost, with 75 MB of cache at 325 W.
What memory does the w7-3555 support?
DDR5-4800 RDIMM with ECC in 8 channels up to 4 TB.
Can the w7-3555 be upgraded?
Yes, to higher-core W-3500 parts on the same board where power, cooling and BIOS allow.
Sources and verification
- Intel Xeon W-3500 and W-2500 Sapphire Rapids Refresh lineup table w7-3555 28 cores (Wccftech)
- Intel Xeon W W790 chipset DDR5 workstations memory lanes (Kingston)
Facts last checked against these sources on . Page last edited on .