Intel Pentium 4 HT 550 socket: LGA 775
The Intel Pentium 4 HT 550 uses the LGA 775 socket. It is a 115 W single-core Prescott desktop part at 3.4 GHz with Hyper-Threading and 1 MB of L2 cache for LGA 775 towers.
- Socket
- LGA 775
- Launched
- June 2004
- Cores and threads
- 1 and 2
- Base power
- 115 W
- Codename
- Prescott
- Segment
- Desktop
- Family
- Intel Pentium 4 HT
- Clocks
- 3.4 GHz
Intel Pentium 4 HT 550 specifications
| Cores | 1 |
|---|---|
| Threads | 2 |
| Core architecture | Prescott cores on 90 nm |
| Clocks | 3.4 GHz (no turbo) |
| Cache | 1 MB L2 |
| Processor base power (TDP) | 115 W |
| Manufacturing process | 90 nm |
| Memory support | DDR or 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 (17x) |
| Package | LGA 775 (775-land FCLGA) |
Motherboard compatibility
Intel Pentium 4 HT 550 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 4 HT 550 is
The Intel Pentium 4 HT 550 is a 3.4 GHz single-core desktop processor with Hyper-Threading from June 2004. It runs one NetBurst Prescott core at 3.4 GHz with no turbo, so 1 core gives 2 threads. Cache is 1 MB of L2 on a 90 nm process. Power is rated at 115 W in an LGA 775 package with part numbers JM80547PG0961M.
The 550 uses an 800 MT/s front side bus with a 17x multiplier at 1.20 V to 1.425 V. Intel sold it at 417 dollars in June 2004. The chip supports MMX, SSE, SSE2 and SSE3 with Hyper-Threading. A 550J shares clocks with Execute Disable support from October 2004. Socket 478 3.4E parts at the same clocks offer a pin grid alternative with the same 115 W rating, so socket separates the boards at identical power.
High power marks the step from 84 W 540 parts to 115 W 550 parts. The extra current needs a stronger heatsink and better case airflow, even though the socket stays flat. That is why boards qualified for 84 W Prescott parts need a power check before fitting the 115 W 550.
Socket and motherboard compatibility
The Pentium 4 HT 550 fits LGA 775 desktops with an 800 MT/s bus, 115 W power delivery and Prescott HT support. It needs a land grid board qualified for 115 W operation. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.
Performance DDR towers are the natural match. Intel 925X boards accept the chip with a 115 W cooler. Boards limited to 84 W Prescott parts need a power check. Socket 478 3.4E parts need pin grid boards instead.
Memory, PCIe and cooling
Memory is DDR or DDR2 through the board chipset. The board sets speed and capacity.
An 800 MT/s bus ties the CPU to the chipset, while PCIe x16 carries graphics on LGA 775 performance boards. No PCIe lanes originate on the die. Cooling uses the LGA 775 plate with a 115 W heatsink and strong airflow. Fresh paste matters at higher power.
Upgrade paths
On LGA 775 the steps are the Pentium 4 HT 560 at 3.6 GHz and the 570 at 3.8 GHz at the same 115 W class. The 550J adds Execute Disable at the same clocks. Socket 478 3.4E offers a pin grid alternative. The 550 lifts with the load plate, so swaps need no solder work.
Frequently asked questions
What socket does the Pentium 4 HT 550 use?
LGA 775, on desktops with 115 W Prescott HT support.
How many cores does the Pentium 4 HT 550 have?
One core and 2 threads at 3.4 GHz with 1 MB of L2 cache.
What memory works with the Pentium 4 HT 550?
DDR or DDR2 through the board chipset.
Can the Pentium 4 HT 550 be upgraded?
The 560 and 570 share the socket at the same power class. The 550J adds Execute Disable.
Sources and verification
Facts last checked against these sources on . Page last edited on .