Intel Pentium D 820 socket: LGA 775
The Intel Pentium D 820 uses the LGA 775 socket. It is a 95 W dual-core Smithfield desktop part at 2.8 GHz with 2 MB of L2 cache for multitasking towers.
- Socket
- LGA 775
- Launched
- May 2005
- Cores and threads
- 2 and 2
- Base power
- 95 W
- Codename
- Smithfield
- Segment
- Desktop
- Family
- Intel Pentium D
- Clocks
- 2.8 GHz
Intel Pentium D 820 specifications
| Cores | 2 |
|---|---|
| Threads | 2 |
| Core architecture | Smithfield cores on 90 nm |
| Clocks | 2.8 GHz (no turbo) |
| Cache | 2 MB L2 (2x1 MB) |
| Processor base power (TDP) | 95 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 820 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 820 is
The Intel Pentium D 820 is a 2.8 GHz dual-core desktop processor from May 2005. It runs two NetBurst cores at 2.8 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 95 W on LGA 775.
The 820 opened the Pentium D line on an 800 MT/s bus with a 14x multiplier at about 241 dollars launch price. Three sources rate this bin at 95 W against 130 W in cpu_list: a processor database, ARK-derived specification data and a launch review, so 95 W is used here. Three identical cpu_list rows share this page as one SKU. It exists because buyers wanted entry dual cores without Hyper-Threading.
Socket and motherboard compatibility
The 820 drops into LGA 775 boards with DDR2 memory and a BIOS that lists Smithfield dual cores, such as 945 boards. It pairs with mainstream chipsets contemporary with Smithfield. 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 any 95 W rated LGA 775 heatsink on the 72 mm mount.
Upgrade paths
On LGA 775 the upgrade is the Pentium D 830 at 3 GHz in the 130 W class, or the Intel Pentium 4 HT 551 at 3.4 GHz for single-core threads. Beyond LGA 775 a move to a newer platform needs a new board and memory.
Frequently asked questions
What socket does the Pentium D 820 use?
LGA 775, on DDR2 boards with a Smithfield-aware BIOS.
How many cores does the Pentium D 820 have?
Two cores and 2 threads at 2.8 GHz with 2 MB of L2 cache and no Hyper-Threading.
What memory works with the Pentium D 820?
DDR2 through the board chipset in two channels.
Sources and verification
- List of Intel Pentium D processors (Wikipedia)
- Pentium 4 670 and Pentium D 820 review (Hexus, confirms 95 W)
- LGA 775 (Wikipedia)
Facts last checked against these sources on . Page last edited on .