Intel Pentium D 840 socket: LGA 775
The Intel Pentium D 840 uses the LGA 775 socket. It is a 130 W dual-core Smithfield desktop part at 3.2 GHz with 2 MB of L2 cache for performance towers.
- Socket
- LGA 775
- Launched
- May 2005
- Cores and threads
- 2 and 2
- Base power
- 130 W
- Codename
- Smithfield
- Segment
- Desktop
- Family
- Intel Pentium D
- Clocks
- 3.2 GHz
Intel Pentium D 840 specifications
| Cores | 2 |
|---|---|
| Threads | 2 |
| Core architecture | Smithfield cores on 90 nm |
| Clocks | 3.2 GHz (no turbo) |
| Cache | 2 MB L2 (2x1 MB) |
| Processor base power (TDP) | 130 W |
| Manufacturing process | 90 nm |
| Memory support | DDR2 through the board chipset |
| Front side bus | 800 MT/s |
| PCI Express | PCIe from the board chipset |
| Integrated graphics | None (board video where fitted) |
| Multiplier | Locked |
| Package | LGA 775 |
Motherboard compatibility
Intel Pentium D 840 needs a motherboard with a LGA 775 socket. Chipset by chipset data for this codename is not recorded yet. See the LGA 775 chipset list and the board maker's CPU support list.
LGA 775 at a glance
| Type | LGA, 775 contacts |
|---|---|
| Package size | 37.5 × 37.5 mm |
| Introduced | 2004 |
| Memory | DDR, DDR2 or DDR3, depending on the motherboard chipset |
| Cooler mounting holes | 72 × 72 mm |
What the Pentium D 840 is
The Intel Pentium D 840 is a 3.2 GHz dual-core desktop processor from May 2005. It runs two NetBurst cores at 3.2 GHz with no Hyper-Threading, so 2 cores give 2 threads. Cache is 2 MB of L2 as two 1 MB dies on a 90 nm process. Power is rated at 130 W on LGA 775.
The 840 topped the Smithfield Pentium D line on an 800 MT/s bus with a 16x multiplier at about 530 dollars launch price. It exists because buyers wanted the fastest Smithfield dual cores without Hyper-Threading where the board cools 130 W.
Socket and motherboard compatibility
The 840 drops into LGA 775 boards with DDR2 memory and a BIOS that lists Smithfield dual cores, such as 945 boards. Boards need voltage regulator support for the 130 W envelope. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.
Memory, PCIe and cooling
Memory is DDR2 through the board chipset in two channels.
An 800 MT/s front side bus ties the CPU to the chipset. PCIe slots hang off the chipset.
Cooling is a 130 W rated LGA 775 heatsink on the 72 mm mount.
Upgrade paths
On LGA 775 the upgrade is the Pentium Extreme Edition 840 at 3.2 GHz for Hyper-Threading at 130 W, or the Intel Pentium D 830 at 3 GHz for a lower cost. Beyond LGA 775 a move to a newer platform needs a new board and memory.
Frequently asked questions
What socket does the Pentium D 840 use?
LGA 775, on DDR2 boards with a Smithfield-aware BIOS and 130 W support.
How many cores does the Pentium D 840 have?
Two cores and 2 threads at 3.2 GHz with 2 MB of L2 cache and no Hyper-Threading.
What memory works with the Pentium D 840?
DDR2 through the board chipset in two channels.
Sources and verification
Facts last checked against these sources on . Page last edited on .