Intel Xeon E3-1275 socket: LGA 1155
The Intel Xeon E3-1275 uses the LGA 1155 socket. It is a 95 W quad core Sandy Bridge server part at 3.4 GHz with turbo to 3.8 GHz and P3000 workstation graphics.
- Socket
- LGA 1155
- Launched
- April 2011
- Cores and threads
- 4 and 8
- Base power
- 95 W
- Codename
- Sandy Bridge
- Segment
- Server
- Family
- Intel Xeon E3
- Clocks
- 3.4 / 3.8 GHz
Intel Xeon E3-1275 specifications
| Cores | 4 |
|---|---|
| Threads | 8 |
| Core architecture | Sandy Bridge cores on 32 nm |
| Clocks | 3.4 GHz base, 3.8 GHz turbo |
| Cache | 8 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 95 W |
| Manufacturing process | 32 nm |
| Memory support | DDR3-1066 and 1333, two channels, up to 32 GB, ECC supported on server boards |
| PCI Express | 20 lanes from the CPU, PCIe 2.0 |
| Integrated graphics | Intel HD Graphics P3000 (850 MHz to 1350 MHz) |
| Multiplier | Locked |
| ECC memory | Supported (requires server board) |
| Package | FCLGA1155 (37.5 × 37.5 mm) |
Motherboard and chipset compatibility
Intel Xeon E3-1275 needs a motherboard with a LGA 1155 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 7 series | Z77, Z75, H77, B75, Q77, Q75 | Works out of the box |
| 6 series: H61, H67, P67, Z68 | Z68, P67, H67, H61 | Works out of the box |
| 6 series business: B65, Q65, Q67 | Q67, Q65, B65 | 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 1155.
LGA 1155 at a glance
| Type | LGA, 1,155 contacts |
|---|---|
| Package size | 37.5 × 37.5 mm |
| Introduced | January 2011 |
| Memory | DDR3 |
| Cooler mounting holes | 75 × 75 mm |
What the Xeon E3-1275 is
Intel Xeon E3-1275 is a quad core Sandy Bridge server processor that Intel released in April 2011 for single socket workstations. It runs at 3.4 GHz base with turbo to 3.8 GHz and includes Hyper-Threading, so 4 cores give 8 threads. Cache is 8 MB Intel Smart Cache. Power is 95 W on a 32 nm process.
Eight fast threads with P3000 graphics suit entry CAD duty. Turbo to 3.8 GHz lifts bursty single threaded tasks. Fixed workstation firmware keeps behavior stable.
Graphics are Intel HD Graphics P3000 at 850 MHz to 1350 MHz for workstation board video. Memory is DDR3 with ECC in two channels. The chip launched in the second quarter of 2011.
Socket and motherboard compatibility
The Xeon E3-1275 fits LGA 1155 in FCLGA1155 form. Single socket workstation boards with C206 chipsets carry Sandy Bridge E3 parts with graphics. The board BIOS must list the exact E3-1275 string.
Workstation boards expose the display outputs needed for the graphics block. Server boards without outputs still run the chip with BMC video.
Memory, PCIe and cooling
Memory support is DDR3-1066 and 1333, two channels, up to 32 GB with ECC on workstation boards. ECC catches single bit errors in always on service. Capacity follows the board design.
PCI Express is 20 lanes from the CPU at PCIe 2.0 for workstation graphics and storage cards.
Cooling is a 95 W workstation heatsink with directed airflow. The CPU cooler compatibility by socket guide notes server cooling stays chassis specific.
Upgrade paths
On LGA 1155 the E3-1275 can move to the E3-1280 class for higher clocks without graphics on a similar board. Memory and storage carry over where the board lists both strings. A same socket graphics-less reference is Intel Xeon E3-1270.
A platform move to a current workstation socket needs a new board and DDR4 memory. Keep the E3-1275 node for entry CAD duty.
Frequently asked questions
What socket does the Intel Xeon E3-1275 use?
It uses LGA 1155 in single socket workstation boards.
Does the Xeon E3-1275 have Hyper-Threading?
Yes. Four cores give 8 threads.
Does the Xeon E3-1275 have integrated graphics?
Yes, P3000 workstation board video from the integrated block.
What memory does the Xeon E3-1275 use?
DDR3-1066 and 1333 with ECC on workstation boards, two channels, up to 32 GB.
Sources and verification
- Sandy Bridge-E Xeon notes (E3-1275 P3000 workstation graphics Apr 2011)
- Sandy Bridge Xeon list (E3-1275 3.4 GHz turbo 3.8 8MB 95W Apr 2011)
Facts last checked against these sources on . Page last edited on .