Intel Pentium 4 505J socket: LGA 775
The Intel Pentium 4 505J uses the LGA 775 socket. It is an 84 W single-core Prescott desktop part at 2.66 GHz with 1 MB of L2 cache and Execute Disable support for value LGA 775 towers.
- Socket
- LGA 775
- Launched
- December 2004
- Cores and threads
- 1 and 1
- Base power
- 84 W
- Codename
- Prescott
- Segment
- Desktop
- Family
- Intel Pentium 4
- Clocks
- 2.66 GHz
Intel Pentium 4 505J specifications
| Cores | 1 |
|---|---|
| Threads | 1 |
| Core architecture | Prescott cores on 90 nm |
| Clocks | 2.66 GHz (no turbo) |
| Cache | 1 MB L2 |
| Processor base power (TDP) | 84 W |
| Manufacturing process | 90 nm |
| Memory support | DDR or DDR2 through the board chipset |
| Front side bus | 533 MT/s |
| PCI Express | PCIe or AGP from the board chipset |
| Integrated graphics | None (board video where fitted) |
| Multiplier | Locked (20x) |
| Package | LGA 775 (775-land FCLGA) |
Motherboard compatibility
Intel Pentium 4 505J 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 505J is
The Intel Pentium 4 505J is a 2.66 GHz single-core desktop processor from December 2004. It runs one NetBurst Prescott core at 2.66 GHz with no Hyper-Threading on this rating, so 1 core gives 1 thread. Cache is 1 MB of L2 on a 90 nm process. Power is rated at 84 W in an LGA 775 package with part number JM80547PE0671M in the E0 stepping.
J marks Execute Disable support for the NX bit, which separates the 505J from the base 505 at identical clocks, cache and power. Both use a 533 MT/s front side bus with a 20x multiplier at 1.25 V to 1.40 V. Intel sold the J revision for boards with NX BIOS paths for safer browsing and office use. The chip supports MMX, SSE, SSE2 and SSE3 with the NX bit enabled where the board allows it.
Security feature flags are the only practical split from the 505. Clocks, cache, bus and power match exactly, so board BIOS support for Execute Disable decides which number to order. That is why the 505 and 505J share coolers and boards, with a BIOS update as the only install step between them.
Socket and motherboard compatibility
The Pentium 4 505J fits LGA 775 value desktops with a 533 MT/s bus, NX BIOS support and Prescott coverage. It needs a land grid board with Execute Disable paths enabled. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.
DDR towers with NX ready chipsets are the natural match. Boards listing the 505 normally accept the 505J with a BIOS update. Older boards may boot yet miss NX operation without the right firmware.
Memory, PCIe and cooling
Memory is DDR or DDR2 through the board chipset. The board sets speed and capacity.
A 533 MT/s bus ties the CPU to the chipset, while graphics hangs off the chipset. No PCIe lanes originate on the die. Cooling uses the LGA 775 plate with an 84 W heatsink. Normal airflow suits the envelope.
Upgrade paths
On LGA 775 the steps are Pentium 4 511J and 515J parts with Execute Disable support at higher clocks. The base 505 at the same clocks offers a non-J alternative for older boards. Hyper-Threading 520J parts add threads as a larger lift. The 505J lifts with the load plate, so swaps need no solder work.
Frequently asked questions
What socket does the Pentium 4 505J use?
LGA 775, on value desktops with NX BIOS support.
How many cores does the Pentium 4 505J have?
One core and 1 thread at 2.66 GHz with 1 MB of L2 cache and Execute Disable support.
What memory works with the Pentium 4 505J?
DDR or DDR2 through the board chipset.
Can the Pentium 4 505J be upgraded?
511J and 515J parts share the socket with NX support. The base 505 suits older boards.
Sources and verification
Facts last checked against these sources on . Page last edited on .