Intel Core Solo T1400 socket: Socket M

What the Core Solo T1400 is

The Intel Core Solo T1400 is a 1.83 GHz mobile single core from May 2006. It runs one Yonah core at a fixed 1.83 GHz through an 11x multiplier on a 667 MT/s bus, so 1 core gives 1 thread with no turbo step. Cache is 2 MB of shared L2 on a 65 nm process. Power is rated at 27 W.

The T1400 closed out the top of the 667 MT/s Solo range in spring 2006. It kept the 27 W envelope of the slower T1200 and T1300 while lifting the clock to 1.83 GHz, which made it the single core pick for buyers who refused a dual core premium. Spring Napa refreshes carried it in thin office machines with chipset graphics.

Yonah is a 32-bit line, and 64-bit support arrived only with Merom parts that later shared this socket. The locked multiplier holds the 11x ratio steady on every board whose BIOS lists the exact sSpec. Behavior is therefore identical from board to board once the stepping is accepted.

Socket and motherboard compatibility

The socketed T1400 fits the Socket M lever socket (Socket M) on Napa boards with the 945PM or 945GM chipset. The 478-contact Micro-FCPGA package seats with zero insertion force and locks under the screw lever, so replacement needs only board support and fresh thermal interface. The board BIOS must list the exact sSpec, since Napa revisions set which steppings boot.

The T1400 shipped both as a socketed Micro-FCPGA part for Socket M and as a soldered Micro-FCBGA part. Only the Micro-FCPGA package fits the lever socket, while the soldered variant belongs to Socket 479 boards and cannot be socketed later. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules for socketed mobile parts.

Memory, PCIe and cooling

Memory is DDR2 through the board chipset in two channels. DDR2-667 SO-DIMMs are the standard match for a 667 MT/s Yonah on Napa boards, and the board fixes the slot count plus the maximum capacity. The notebook vendor list sets the tested module size for the exact model.

The front side bus runs at 667 MT/s between the CPU and the mobile chipset. No PCIe lanes come from the T1400 itself, while board graphics and expansion slots hang off the chipset. Transfer bandwidth matches the other 667 MT/s Solo and Duo parts of the same wave.

Cooling is the notebook vendor heat pipe assembly for the exact chassis, sized for the 27 W envelope with a side vent. Retail desktop towers do not mount to mobile sockets, so the fan and pad set must come from the notebook maker. Paste or pad replacement follows the service manual for the exact model.

Upgrade paths

On Socket M the single core path from a T1400 ends, since it tops the 667 MT/s Solo range. The way forward is a dual core such as the Core Duo T2500 at 2.0 GHz, the T2600 at 2.17 GHz, or the T2700 at 2.33 GHz. Each keeps the 667 MT/s bus and steps to a 31 W envelope. A swap must stay within the thermal design the chassis was qualified for, and the BIOS must list the new sSpec.

A larger step is a Merom Core 2 Duo such as the T7200 at 2.0 GHz on the same Socket M, which adds 64-bit support with 4 MB of L2 cache. Napa boards need a Merom aware BIOS revision for those parts. Past Merom the path leaves the socket for a Socket P Santa Rosa board, as described in the Socket vs chipset: what decides whether a CPU works guide.