Intel Core i7-990X socket: LGA 1366
The Intel Core i7-990X uses the LGA 1366 socket. It is a 130 W six core Gulftown Extreme part at 3.46 GHz with turbo to 3.73 GHz and an unlocked multiplier.
- Socket
- LGA 1366
- Launched
- February 2011
- Cores and threads
- 6 and 12
- Base power
- 130 W
- Codename
- Gulftown
- Segment
- Desktop
- Family
- Intel Core i7
- Clocks
- 3.46 / 3.73 GHz
Intel Core i7-990X specifications
| Cores | 6 |
|---|---|
| Threads | 12 |
| Core architecture | Gulftown cores on 32 nm |
| Clocks | 3.46 GHz base, 3.73 GHz turbo |
| Cache | 12 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 130 W |
| Manufacturing process | 32 nm |
| Memory support | DDR3-1066, three channels, up to 24 GB |
| PCI Express | PCIe 2.0 from the X58 chipset |
| Integrated graphics | None (Extreme part, discrete card required) |
| Multiplier | Unlocked |
| Package | FCLGA1366 |
Motherboard and chipset compatibility
Intel Core i7-990X needs a motherboard with a LGA 1366 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| X58 enthusiast | X58 | Works out of the box Early X58 boards may need a BIOS update with Gulftown microcode before a six core chip will start. |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for LGA 1366.
LGA 1366 at a glance
| Type | LGA, 1,366 contacts |
|---|---|
| Package size | n/a |
| Introduced | 2008 |
| Memory | DDR3 triple channel, up to 24 GB on desktop boards |
| Cooler mounting holes | 80 × 80 mm |
What the Core i7-990X is
Intel Core i7-990X Extreme Edition is a six core Gulftown desktop processor that Intel released in February 2011 for flagship home towers. It runs at 3.46 GHz base with turbo to 3.73 GHz on one core and includes Hyper-Threading, so 6 cores give 12 threads. Cache is 12 MB Intel Smart Cache. Power is 130 W on a 32 nm process.
The X suffix marks an unlocked multiplier for X58 boards. Owners raise clocks where cooling permits. At stock it leads the LGA 1366 desktop range on base clocks, slightly above the 980X.
There is no integrated graphics on this die. Memory runs in three DDR3 channels. The chip launched at a flagship price for enthusiasts who wanted the fastest 1366 part.
Socket and motherboard compatibility
The Core i7-990X fits LGA 1366 in FCLGA1366 form. Tuning needs an X58 board with suitable power stages and cooling. QuickPath links the CPU to the chipset at 6.4 GT/s on this SKU.
A board that lists the exact 990X string is the safe choice for used flagship builds. Update the BIOS before fitting the chip on early X58 boards.
Memory, PCIe and cooling
Memory support is DDR3-1066, three channels, up to 24 GB on desktop X58 boards. Three matched modules give the rated bandwidth. ECC is not supported on desktop boards.
PCI Express is revision 2.0 from the X58 chipset, commonly as two x16 slots for multi GPU builds.
Cooling needs headroom above the stock 130 W unit when tuning. The 80 by 80 mm pattern accepts many tower coolers. The CPU cooler compatibility by socket guide lists shared patterns.
Upgrade paths
On LGA 1366 the 990X already tops the desktop range, so later steps are Sandy Bridge-E parts on LGA 2011 boards. DDR3 and drives carry over with a new population in fours. A locked six core reference on the same socket is Intel Core i7-980.
A platform move to DDR4 needs a new board and RAM. Keep the X58 flagship for editing duty.
Frequently asked questions
What socket does the Intel Core i7-990X use?
It uses LGA 1366. Tuning needs an X58 board.
Is the Core i7-990X unlocked?
Yes. The X suffix marks an unlocked multiplier.
What memory does the Core i7-990X use?
DDR3-1066, three channels, up to 24 GB on desktop X58 boards.
How is the Core i7-990X different from the i7-980?
The 990X runs at 3.46 GHz base with 3.73 GHz turbo. The 980 runs at 3.33 GHz base with 3.6 GHz turbo.
Sources and verification
- Intel Core i7-990X Extreme review (bit-tech, 3.46 GHz, turbo 3.73 GHz, unlocked, Feb 2011)
- Core i7-990X 3.47 GHz Gulftown Feb 2011 (Core i7 list, QPI 6.4, DDR3-1066)
Facts last checked against these sources on . Page last edited on .