AMD A4-4355M socket: Socket FP2

What the A4-4355M is

AMD A4-4355M is a dual core Trinity mobile APU that AMD released in September 2012 for thin laptops with soldered boards. It uses the Piledriver core design on a 32 nm process, running at 1.9 GHz base with turbo to 2.4 GHz. The cache is 1 MB L2 (no L3). Power is 17 W. Graphics come from AMD Radeon HD 7400G (327 MHz to 424 MHz).

The two cores sit in one Piledriver module, and threads equal cores at 2. The on die graphics block shares system memory over DDR3 in two channels. That sharing is why two matched modules help frame pacing in light games.

At 17 W the A4-4355M belongs to the ultra low voltage mobile group. The clocks suit browsing and office work on battery with passive or minimal active cooling. Laptops pair it with soldered memory in thin bodies. The How to find your CPU socket type guide shows how to confirm the package before ordering parts.

Socket and motherboard compatibility

The A4-4355M solders to Socket FP2 with 827 balls and cannot be moved to another board. Laptop makers qualify each model with a specific board and BIOS, so even another Trinity FP2 part is not a drop in upgrade. The socketed twin family lives on Socket FS1r2, but the packages never interchange.

Power and firmware decide service results. The 17 W rating sizes the heat pipe and fan curve, and the board BIOS must list the exact A4-4355M string. The CPU cooler compatibility by socket guide notes that soldered parts have no desktop mount pattern.

Memory, PCIe and cooling

Memory support is ddr3 up to 1333 mt/s, two channels. Many thin boards solder the memory, so capacity locks at purchase. Two matched channels help the graphics block that shares system RAM.

PCI Express is PCIe 2.0 from the APU with a layout that varies by board design. Thin boards wire lanes to Wi-Fi and SSDs rather than graphics slots. There is no graphics card slot to consider.

Cooling uses the laptop heatsink sized for the 17 W envelope. Repaste and fan cleaning help sustained clocks more than any setting change.

Upgrade paths

There is no CPU upgrade path on soldered Socket FP2. The A4-4355M cannot be removed, so a faster Trinity part means a new board or a new laptop. The practical move for more speed is a full platform change to FP8 or newer, with DDR5 memory and current wireless.

A platform move means a new laptop. Current AMD mobile lives on newer BGA packages with DDR5 and modern wireless, which no FP2 board can reach. Recycle the old laptop through a proper e waste path once data is wiped.