Intel Core i5-9400T socket: LGA 1151
The Intel Core i5-9400T uses the LGA 1151 socket on revision 2 boards with 300 series chipsets. It is a low power six core desktop chip at 35 W.
- Socket
- LGA 1151 (revision 2)
- Launched
- April 2019
- Cores and threads
- 6 and 6
- Base power
- 35 W
- Codename
- Coffee Lake Refresh
- Segment
- Desktop
- Family
- Intel Core i5
- Clocks
- 1.8 / 3.4 GHz
Intel Core i5-9400T specifications
| Cores | 6 |
|---|---|
| Threads | 6 (no Hyper-Threading) |
| Core architecture | Coffee Lake Refresh cores on 14 nm |
| Clocks | 1.8 GHz base, up to 3.4 GHz with Turbo Boost 2.0 |
| Cache | 9 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 35 W |
| Manufacturing process | 14 nm |
| Memory support | DDR4-2666, two channels, up to 128 GB |
| PCI Express | 16 lanes from the CPU, PCIe 3.0 |
| Integrated graphics | Intel UHD Graphics 630 (350 MHz to 1.05 GHz) |
| Multiplier | Locked |
| Package | FCLGA1151 (37.5 by 37.5 mm) |
Motherboard and chipset compatibility
Intel Core i5-9400T needs a motherboard with a LGA 1151 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 300 series: B365 and Z390 | Z390, B365 | Works out of the box |
| 300 series: H310, B360, H370, Q370, Z370 | Z370, H370, B360, H310, Q370 | Needs a BIOS update Needs a BIOS update before a 9th Gen processor will start. Check the board maker's CPU support list. |
| 200 series | Z270, H270, B250, Q270, Q250 | Not supported |
| 100 series | Z170, H170, B150, H110, Q170, Q150 | Not supported |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for LGA 1151.
LGA 1151 at a glance
| Type | LGA, 1,151 contacts |
|---|---|
| Package size | 37.5 × 37.5 mm |
| Introduced | August 2015 |
| Memory | DDR4 on most boards (some early boards use DDR3L). DDR4 only on the second revision |
| Cooler mounting holes | 75 × 75 mm |
What the Core i5-9400T is
The Core i5-9400T squeezes six cores without Hyper-Threading into a 35 W envelope. It launched in the second quarter of 2019 with a 1.8 GHz base and up to 3.4 GHz boost. Intel targets small towers that need six real cores with minimal heat.
Nine megabytes of Smart Cache support office multitasking across six threads. The low base stretches efficiency in compact cases. Boost to 3.4 GHz lifts single thread bursts for everyday apps.
UHD Graphics 630 from 350 MHz to 1050 MHz covers office displays. The process is 14 nm and the multiplier is locked. ECC works where workstation boards validate it. Note that some lists show September 2018 for this SKU, while Intel ARK lists Q2 2019, and this page uses Q2 2019.
Socket and motherboard compatibility
The 9400T fits LGA 1151 on revision 2 boards only. H310 and B360 boards suit small office towers with 35 W cooling. Z390 boards accept it natively, while early Z370 may need an update. Revision 1 boards never support it.
DDR4-2666 in two channels up to 128 GB per Intel ARK and board manuals covers office use, though some databases cap lower. Matched pairs give dual channel speed. The Socket vs chipset: what decides whether a CPU works guide explains revision rules.
Single socket compact towers are the home. Another LGA 1151 chip on the same board adds speed within the support list.
Memory, PCIe and cooling
DDR4-2666 in two channels suits six core office multitasking. Start with 16 GB where many tabs stay open. ECC UDIMMs work on C242 and C246 where validated.
Sixteen Gen3 CPU lanes can hold NVMe or a basic card while UHD 630 handles displays. Most small towers skip discrete graphics. Chipset lanes add the rest of I/O.
Low profile 35 W cooling from the CPU cooler compatibility by socket guide runs quietly. Keep vents clear in cabinet installs.
Upgrade paths
On the same socket, the Intel Core i5-9500T raises clocks at the same 35 W for faster interaction. The Intel Core i3-9100T drops to four cores at the same 35 W for lower cost. Both share 300 series boards after a BIOS check.
Pentium Gold parts suit single app terminals with fewer cores. They lack Turbo for bursts.
Past LGA 1151 low power desktops move to LGA 1200. The 9400T covers six core offices where 35 W must hold.
Frequently asked questions
What socket does the Core i5-9400T use?
It uses LGA 1151 on revision 2 boards with 300 series chipsets.
How many cores does the 9400T have?
Six cores without Hyper-Threading give six threads. Base is 1.8 GHz with boost to 3.4 GHz.
What does the T suffix mean?
The T suffix marks 35 W low power tuning.
Which graphics does the 9400T include?
UHD Graphics 630 from 350 MHz to 1050 MHz.
What memory does the 9400T support?
DDR4-2666 in two channels up to 128 GB.
Sources and verification
Facts last checked against these sources on . Page last edited on .