Intel Core Duo LV L2400 socket: Socket 479

What the Core Duo LV L2400 is

The Core Duo LV L2400 is the middle low voltage dual-core Yonah, released in January 2006. Two 65 nm cores share 2 MB of L2 cache at 1.67 GHz, yielding two threads for work that Solo chips handled one task at a time. The 667 MT/s front side bus feeds the pair from the Napa chipset. Rated power holds at 15 W, the LV class limit, which fits slim professional notebooks better than the 31 W standard parts.

Its locked 10x multiplier turns the 667 MT/s bus into 1.67 GHz, and some databases round the same mark to 1666 MHz. No turbo state exists, so cooling plans face a single ceiling. Shared cache arbitration lets a busy core borrow space from an idle partner, lifting responsiveness in mixed loads. Enhanced Intel SpeedStep trims clock and voltage when the desk is quiet. Yonah media instructions reach SSE3, while 64-bit addressing never arrived on this generation.

At 15 W the chip sits between the 9 W ULV twins and the full-voltage T series. The soldered Micro-FCBGA 479 package fixes it to one board with 479 balls, so thermal duty falls on a maker heat pipe tuned for this curve. Battery life trails the ULV line but beats any standard-voltage dual core of the season. That middle ground made the LV series the pick for travelers who edited documents, ran small builds and drove projectors from one light machine.

The LV ladder reads cleanly: L2300 at 1.5 GHz, this L2400 at 1.67 GHz, and the later L2500 at 1.83 GHz, each with 2 MB of shared cache and the same 667 MT/s bus. Stepping up buys single-thread pace at identical rated power, though chassis heat and fan noise rise with real load. Against the ULV L2500 at 1.2 GHz, the LV L2400 trades watts for a clear clock lead. Buyers weighed that trade against screen size and travel weight.

Socket and motherboard compatibility

The LV L2400 is soldered to its board and cannot be replaced, so the board model answers all fit questions. Its balls bond to a Napa platform board from the Intel 945 chipset family. Firmware carries the supported processor entry, and a donor must show the same L2400 name or service code. The Socket vs chipset: what decides whether a CPU works guide describes confirming such mobile entries.

This fixed Socket 479 package never meets the pinned Yonah parts of Socket M. Socket M uses a hinge socket with BIOS tables for removable Core Duo and Core Solo T chips. Contacts, retention and firmware all differ on the soldered side. Replacing a dead LV board means finding a board built for the same soldered L2400.

Shared numbers across power classes demand full ratings at purchase. A 1066 MHz 9 W ULV L2400 exists in some catalogs beside this 1666 MHz 15 W LV L2400, so clock and wattage must be verified as one. Board stickers and manuals carry the service code that settles it. Fitting the wrong class would leave power limits and fan curves mismatched.

Memory, PCIe and cooling

System memory attaches through the chipset on LV boards. Makers wire DDR2 to the Intel 945 silicon and set slot counts and module ceilings per model. The L2400 reaches that memory over its 667 MT/s front side bus. Documented DDR2 modules in matched sizes keep the dual core fed, and twin equal sticks suit two-slot boards.

Expansion lives downstream of the chipset as well. The processor ships no PCI Express lanes; its bus terminates in the 945 chip, which supplies slots, wireless and storage links. Graphics come from the chipset or a discrete mobile GPU on the board. On surviving machines, adding memory and fitting a solid-state drive change daily speed more than the 1.67 GHz clock implies.

Cooling matches the 15 W soldered envelope. A slim pipe or plate carries heat from the package to a small exhaust fan under firmware control. No boxed cooler exists and no mounting pattern concerns the owner. Clean vents plus fresh interface material restore the intended acoustic and thermal behavior after years of service.

Upgrade paths

No upgrade path fits the LV L2400. Soldered balls bind it to its board permanently, and field tools cannot exchange a 479-ball processor. Neither the L2500 LV nor any ULV chip can occupy these pads. The Intel Celeron 220 page gives the same answer for its soldered Socket 479 package, because the package, not the family, forbids the swap.

Quicker Yonah performance needs a board manufactured for a faster soldered LV part, or a newer used notebook when the era itself limits the work. Owners who want processor choice should look at socketed Yonah systems under Socket M, where pinned T series chips change per the maker list. The Socket vs chipset: what decides whether a CPU works guide maps the checks for both directions.