Intel Xeon W-2191B socket: LGA 2066
The Intel Xeon W-2191B uses the LGA 2066 socket in Apple Mac Pro workstations. It is an 18 core Skylake-W OEM chip at 140 W with boost to 4.3 GHz.
- Socket
- LGA 2066
- Launched
- 2017
- Cores and threads
- 18 and 36
- Base power
- 140 W
- Codename
- Skylake-W
- Segment
- Workstation
- Family
- Intel Xeon W
- Clocks
- 2.3 / 4.3 GHz
Intel Xeon W-2191B specifications
| Cores | 18 |
|---|---|
| Threads | 36 |
| Core architecture | Skylake-W on 14 nm |
| Clocks | 2.3 GHz base, up to 4.3 GHz Turbo |
| Cache | 24.75 MB L3 |
| Processor base power (TDP) | 140 W |
| Manufacturing process | 14 nm |
| Memory support | DDR4-2666, four channels, up to 512 GB with ECC |
| PCI Express | PCIe 3.0, 48 lanes from the CPU |
| Integrated graphics | None |
| Multiplier | Locked |
| ECC memory | Yes |
| Package | FCLGA2066 (45.0 × 52.5 mm) |
Motherboard compatibility
Intel Xeon W-2191B needs a motherboard with a LGA 2066 socket. Chipset by chipset data for this codename is not recorded yet. See the LGA 2066 chipset list and the board maker's CPU support list.
LGA 2066 at a glance
| Type | LGA, 2,066 contacts |
|---|---|
| Package size | n/a |
| Introduced | June 2017 |
| Memory | DDR4-2933, four channels, up to 256 GB |
| Cooler mounting holes | 80 × 80 mm |
What the Xeon W-2191B is
The Xeon W-2191B is an eighteen core, thirty six thread OEM workstation processor from Skylake-W. It launched in 2017 for Apple Mac Pro systems with a 2.3 GHz base and up to 4.3 GHz Turbo at 140 W. Eighteen cores cover top Mac Pro configurations where maximum threads matter.
Twenty four point seven five megabytes of L3 cache feed eighteen cores. The 2.3 GHz base keeps power in check, while 4.3 GHz single core boost keeps interaction brisk. All core Turbo reaches 3.4 GHz for sustained renders.
No integrated graphics ship. Quad channel DDR4-2666 ECC up to 512 GB suits large Mac Pro timelines. Forty eight PCIe lanes feed GPUs and I/O in Mac Pro slots.
The B suffix marks Apple OEM variants without Trusted Execution Technology. Locked multiplier keeps workstation behavior stable. Buyers meet it only in used Mac Pro, since retail never sold it separately.
Socket and motherboard compatibility
The W-2191B fits LGA 2066 in Apple Mac Pro 2019 boards. Apple firmware carries its power tables. Retail C422 lists do not include B variants.
Mac Pro slots wire four memory channels with ECC. Expansion follows Apple guidance for GPUs and Afterburner. The Socket vs chipset: what decides whether a CPU works guide explains OEM limits.
The Xeon W-2195 is the retail 18 core counterpart with TXT on C422 boards. The W-2170B is the 14 core Mac Pro option.
Memory, PCIe and cooling
DDR4-2666 ECC in four channels up to 512 GB is the Mac Pro design. Apple memory holds quad channel bandwidth near 85.4 GB per sec. ECC protects long jobs.
Forty eight PCIe 3.0 lanes feed Mac Pro expansion. GPUs and I/O cards split lanes per Apple budgets. NVMe uses dedicated lanes.
One hundred forty watts cool with Mac Pro thermal assembly. Service follows Apple manuals.
Upgrade paths
On Mac Pro memory and GPU upgrades help most workflows first. CPU moves stay within Apple supported B variants.
Past LGA 2066 a new Mac Pro platform is required. Retail towers use W-2195 instead.
Frequently asked questions
What socket does the Xeon W-2191B use?
It uses LGA 2066 in Apple Mac Pro systems.
How many cores does the W-2191B have?
Eighteen cores with thirty six threads at 2.3 GHz base with up to 4.3 GHz Turbo.
What is the difference between W-2191B and W-2195?
The B variant lacks Trusted Execution Technology and ships only in Mac Pro, while W-2195 is retail with TXT.
When did the W-2191B launch?
2017 with Apple Mac Pro workstation options.
Sources and verification
Facts last checked against these sources on . Page last edited on .