Intel Core i7-4558U socket: BGA 1168

What the Core i7-4558U is

Intel Core i7-4558U is a dual core Haswell ULT part that Intel released in June 2013 for thin laptops with soldered boards. It uses the Haswell core design on a 22 nm process, running at 2.8 GHz base with turbo to 3.3 GHz. The cache is 4 MB Smart Cache. Power is 28 W. Graphics come from Intel Iris Graphics 5100 (200 MHz to 1200 MHz).

The two cores carry Hyper-Threading for 4 threads. The GT3 graphics block with extra execution units lifts frame pacing without a separate chip, though DDR3L-only designs skip LPDDR3 here. The package integrates the dual channel memory controller and PCIe lanes on die.

At 28 W the Core i7-4558U belongs to the 28 W performance ULT group. The 2.8 GHz base with 3.3 GHz turbo suits web, office and classroom work with bursts for foreground tasks. Laptops pair it with soldered memory in the thinnest bodies. The How to find your CPU socket type guide shows how to confirm the package before ordering parts.

Socket and motherboard compatibility

The Core i7-4558U solders to BGA 1168 with 1,168 balls in a 40 by 24 mm footprint and cannot be moved to another board. Laptop makers qualify each model with a specific board and BIOS, so even another Haswell ULT part is not a drop in upgrade. Boards follow thin notebook layouts with soldered memory in the thinnest designs.

Power and firmware decide service results. The 28 W envelope sizes the heat spreader and fan curve, and the board BIOS must list the exact Core i7-4558U string. The CPU cooler compatibility by socket guide notes that soldered mobile parts have no desktop mount pattern. Socket vs chipset: what decides whether a CPU works covers Intel pairing basics.

Memory, PCIe and cooling

Memory support is ddr3l-1333 and 1600, two channels, up to 16 gb. 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, 12 lanes. Thin boards wire lanes to Wi-Fi and SSDs rather than graphics slots. There is rarely a meaningful graphics card upgrade on these power budgets.

Cooling uses the laptop thermal solution, not a retail mount. The 28 W envelope suits single fan thin bodies with a spreader over the package. Repaste and fan cleaning help sustained turbo more than any setting change.

Upgrade paths

There is no CPU upgrade path on soldered BGA 1168. The Core i7-4558U cannot be removed, so a faster Haswell ULT part means a new board or a new laptop. Within the family Intel Celeron 2955U shows another option, but boards and firmware rarely mix across makers.

A platform move means a new laptop. Current Intel mobile lives on newer BGA packages with DDR4 or LPDDR4 and current wireless, which no BGA 1168 board can reach. Recycle the old laptop through a proper e waste path once data is wiped.