Intel Core i3-2125 socket: LGA 1155
The Intel Core i3-2125 uses the LGA 1155 socket. It is a 65 W dual core Sandy Bridge desktop part at 3.3 GHz with HD Graphics 2000.
- Socket
- LGA 1155
- Launched
- September 2011
- Cores and threads
- 2 and 4
- Base power
- 65 W
- Codename
- Sandy Bridge
- Segment
- Desktop
- Family
- Intel Core i3
- Clocks
- 3.3 GHz
Intel Core i3-2125 specifications
| Cores | 2 |
|---|---|
| Threads | 4 |
| Core architecture | Sandy Bridge cores on 32 nm |
| Clocks | 3.3 GHz (no turbo) |
| Cache | 3 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 65 W |
| Manufacturing process | 32 nm |
| Memory support | DDR3-1066 and 1333, two channels, up to 32 GB |
| PCI Express | 16 lanes from the CPU, PCIe 2.0 |
| Integrated graphics | Intel HD Graphics 2000 (850 MHz to 1100 MHz) |
| Multiplier | Locked |
| Package | FCLGA1155 (37.5 × 37.5 mm) |
Motherboard and chipset compatibility
Intel Core i3-2125 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 Core i3-2125 is
Intel Core i3-2125 is a dual core Sandy Bridge desktop processor that Intel released in September 2011 for office towers. It runs at a fixed 3.3 GHz with no turbo and includes Hyper-Threading, so 2 cores give 4 threads. Cache is 3 MB Intel Smart Cache. Power is 65 W on a 32 nm process.
The 2125 matches the i3-2120 on CPU clocks and graphics. It arrived in the late 2011 refresh wave alongside the i3-2130. Office behavior is identical to the 2120 in everyday suites.
Graphics are Intel HD Graphics 2000 at 850 MHz to 1100 MHz. The block drives office monitors at full resolution. Discrete cards stay optional for this class.
Socket and motherboard compatibility
The Core i3-2125 fits LGA 1155 in FCLGA1155 form. All 6 series and 7 series boards boot Sandy parts directly. H61 and B75 cover office builds, while Z68 and Z77 add tuning for K chips that this locked dual does not need.
BIOS support is rarely an issue for Sandy duals. Confirm the board lists the 2125 string, then install with stock cooling. The Socket vs chipset: what decides whether a CPU works guide explains the chipset splits.
Memory, PCIe and cooling
Memory support is DDR3-1066 and 1333, two channels, up to 32 GB. A matched 2 by 4 GB kit suits most 2125 towers. ECC is not supported.
PCI Express is 16 lanes from the CPU at PCIe 2.0. The slot can take a basic card for extra outputs.
Cooling is the standard 65 W heatsink on 75 × 75 mm spacing. Replacement coolers for this pattern remain easy to find.
Upgrade paths
On LGA 1155 the 2125 can move to the i3-2130 for 100 MHz more, or to a Core i5 for quad cores. Storage and DDR3 carry over. A same clock reference is Intel Core i3-2120.
A move to a DDR4 board such as LGA 1200 needs a new board and RAM. Keep the 2125 tower for lab use.
Frequently asked questions
What socket does the Intel Core i3-2125 use?
It uses LGA 1155. Both 6 series and 7 series boards boot it directly.
How is the Core i3-2125 different from the i3-2120?
CPU clocks, cache, power and graphics match. Treat them as interchangeable in office builds.
What memory does the Core i3-2125 use?
DDR3-1066 and 1333, two channels, up to 32 GB.
Does the Core i3-2125 have Hyper-Threading?
Yes. Two cores give 4 threads.
Sources and verification
- Intel Core i3 Desktop Comparison Chart (Intel, i3-2125 Q3-11 3.3 GHz HD2000 850 to 1100)
- OptiPlex 3010 Guide (Dell, i3-2125 3.3 GHz 65 W office tower CPU)
Facts last checked against these sources on . Page last edited on .