Intel Core i5-2405S socket: LGA 1155
The Intel Core i5-2405S uses the LGA 1155 socket. It is a 65 W quad core Sandy Bridge desktop part at 2.5 GHz with turbo to 3.3 GHz and HD Graphics 3000.
- Socket
- LGA 1155
- Launched
- May 2011
- Cores and threads
- 4 and 4
- Base power
- 65 W
- Codename
- Sandy Bridge
- Segment
- Desktop
- Family
- Intel Core i5
- Clocks
- 2.5 / 3.3 GHz
Intel Core i5-2405S specifications
| Cores | 4 |
|---|---|
| Threads | 4 |
| Core architecture | Sandy Bridge cores on 32 nm |
| Clocks | 2.5 GHz base, 3.3 GHz turbo |
| Cache | 6 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 3000 (850 MHz to 1100 MHz) |
| Multiplier | Locked |
| Package | FCLGA1155 (37.5 × 37.5 mm) |
Motherboard and chipset compatibility
Intel Core i5-2405S 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 i5-2405S is
Intel Core i5-2405S is a quad core Sandy Bridge desktop processor that Intel released in May 2011 for power capped towers. It runs at 2.5 GHz base with turbo to 3.3 GHz and has no Hyper-Threading, so 4 cores give 4 threads. Cache is 6 MB Intel Smart Cache. Power is 65 W on a 32 nm process.
The 2405S matches the 2400S on CPU clocks while moving graphics to HD Graphics 3000. Office displays look the same, but the stronger block helps video playback. Small offices chose it for quiet builds.
Graphics are Intel HD Graphics 3000 at 850 MHz to 1100 MHz. The block feeds office monitors through board outputs. Memory is DDR3 in two channels.
Socket and motherboard compatibility
The Core i5-2405S fits LGA 1155 in FCLGA1155 form. H61, B75, H77 and other 6 and 7 series boards boot Sandy quads directly. The board BIOS should list the 2405S string.
At 65 W the chip suits compact towers that cannot cool a 95 W quad. Check case clearance before reusing a tall tower cooler.
Memory, PCIe and cooling
Memory support is DDR3-1066 and 1333, two channels, up to 32 GB. A 4 GB to 8 GB pair covers office use. ECC is not supported.
PCI Express is 16 lanes from the CPU at PCIe 2.0 for a single graphics or I/O card. Most builds leave the slot empty.
Cooling uses the 75 × 75 mm desktop mount with a standard fan. Dust filters extend service intervals in labs.
Upgrade paths
On LGA 1155 the 2405S can move to the standard i5-2400 for higher base clocks, or to an i7-2600 for Hyper-Threading. The board and RAM stay. A same power HD2000 comparison is Intel Core i5-2400S.
A jump to a current DDR4 platform needs a new board, cooler mount check and RAM. Keep the 2405S tower for office use.
Frequently asked questions
What socket does the Intel Core i5-2405S use?
It uses LGA 1155 in FCLGA1155 form.
How is the Core i5-2405S different from the 2400S?
The 2405S uses HD Graphics 3000. The 2400S uses HD Graphics 2000. CPU clocks match.
What memory does the Core i5-2405S use?
DDR3-1066 and 1333, two channels, up to 32 GB.
Does the Core i5-2405S have Hyper-Threading?
No. Four cores give 4 threads.
Sources and verification
- Intel Core i5-2000 Series (CPU Grade, i5-2405S 2.5 to 3.3 GHz HD3000)
- ASUS P8Z77-M PRO CPU list (2405S 2.5G 6M 4C LGA1155)
Facts last checked against these sources on . Page last edited on .