Intel Core Solo ULV U1300 socket: Socket 479

What the Core Solo ULV U1300 is

The Core Solo ULV U1300 is a single-core mobile processor from the Yonah generation, released in April 2006. It carries one Yonah core built on the 65 nm process and runs at a fixed 1.07 GHz with no turbo step, so one core delivers exactly one thread. That core pairs with 2 MB of L2 cache and a 533 MT/s front side bus, the same cache and bus setup shared across the ultra low voltage Yonah line. Intel aimed the part at small thin notebooks where battery life mattered more than peak speed.

Clock control is simple. A locked 8x multiplier sets the 1.07 GHz pace against the 533 MT/s bus, and there is no higher boost state to budget for. Enhanced Intel SpeedStep drops the clock and voltage at idle, which stretches battery time during light work such as reading, typing or playing local media. Some catalogs round the clock to 1.06 GHz, while the Wikipedia mobile list gives 1.07 GHz, and this page follows the mobile list value. Like every Yonah processor, the U1300 is a 32-bit design with MMX, SSE, SSE2 and SSE3, and it has no 64-bit support, so surviving machines need a 32-bit operating system.

ULV marks the lowest Yonah power class at 5.5 W. The rating covers the whole chip under load and lets board makers cool it with a slim plate or a short heat pipe instead of a large fan assembly. The processor ships in a Micro-FCBGA 479 package whose balls solder straight to the board, so there is no socket lever and no swap step. Heat moves from the die into the board maker spreader, and the firmware fan table handles the rest. Twelve pipeline stages in the Yonah core keep per-clock efficiency close to the earlier Dothan Pentium M while adding SSE3 for media code.

Inside the Core Solo ULV line, the U1300 sits at the base. The U1400 repeats the same 5.5 W recipe at 1.2 GHz, and the later U1500 reaches 1.33 GHz with the same 2 MB cache and 533 MT/s bus. A buyer who needed two threads stepped across to the 9 W Core Duo ULV parts instead. For a 2006 thin notebook, the U1300 gave the longest battery time of the three Solo options at the cost of the lowest clock.

Socket and motherboard compatibility

The U1300 is soldered to its board and cannot be replaced, so every compatibility question ends at the board itself. The 479 balls of the Micro-FCBGA package bond to pads on a Napa platform board built around the Intel 945 chipset family, and only that board maker firmware knows the part. A service replacement board must list this exact processor in the maker support data before it counts as compatible. The Socket vs chipset: what decides whether a CPU works guide explains how chipset and firmware pin a mobile part to its board.

Socketed Yonah cousins live under Socket M instead, and nothing transfers between the two packages. A Socket M board accepts pinned Core Solo and Core Duo T series chips, while this Socket 479 file covers only the soldered ball package. Pin layout, mounting and firmware tables all differ, so no adapter or BIOS edit bridges them. When a U1300 board fails, the fix is a board built for the same soldered part, not a socketed donor.

Service papers sometimes name the chip by a board code rather than the marketing name. Match that code before ordering a board, since nearby ULV numbers share the same ball pattern but run different clocks. A mismatch can leave the fan table or power limits wrong for the fitted part. Keep the original board and firmware together wherever possible.

Memory, PCIe and cooling

Memory hangs off the board chipset, not the processor. Boards of this generation carry DDR2 through the Intel 945 based Napa platform, with slot count and size limits set by the board maker. The processor side of the link is the 533 MT/s front side bus, which sets the pace for cache misses and memory traffic. Fitting the maker approved DDR2 modules keeps that link stable, and a second matched module helps where the board supports two slots.

There are no PCI Express lanes inside the U1300. The front side bus ties the CPU to the chipset, and every expansion slot, wireless card and drive port hangs off the chipset side. Graphics also live outside the processor, either in the board chipset or in a separate mobile GPU fitted to the board. A slow disk or a tired wireless card traces back to those board parts rather than to the CPU.

Cooling is a board job sized for 5.5 W. A slim copper plate or short heat pipe carries heat from the soldered package to the fan outlet, and the firmware fan table is tuned for that small load. There is no retail heatsink to buy and no mounting pattern to match. Fresh thermal interface material and a clean fan restore the original behavior when temperatures creep up with age.

Upgrade paths

There is no CPU upgrade path on this package. The soldered balls cannot be reworked in the field, so the U1300 stays with its board for life. A faster Yonah, even a close number in the same ULV line, cannot be fitted afterwards. The Intel Celeron 220 page shows the same rule on another soldered Socket 479 part: the board is the unit of replacement.

The practical move is a board built for a quicker soldered Yonah, or a newer used notebook when the whole platform feels slow. Socketed Yonah machines under Socket M do allow chip swaps within the maker support list, which is a different starting point for anyone shopping for an upgradeable chassis. The Socket vs chipset: what decides whether a CPU works guide sets out how to check either case before spending money.