Intel Core i3-8109U socket: BGA 1528

What the Core i3-8109U is

The Core i3-8109U is a two core, four thread mobile processor with a 3.0 GHz base and up to 3.6 GHz boost. It carries 4 MB of Smart Cache and a 28 W TDP on the 14 nm process. Intel ARK lists configurable TDP down to 20 W at 1.9 GHz for thin bodies without fans running hard.

It belongs to the 28 W Coffee Lake-U line with Iris Plus graphics and 128 MB of eDRAM, which lifts display and light creation work over the 15 W UHD parts. Two cores with Hyper-Threading cover office multitasking and study loads. The multiplier is locked.

Iris Plus 655 runs from 300 MHz base to 1.05 GHz max with the eDRAM beside it. Memory runs as DDR4-2400 or LPDDR3-2133 in two channels up to 32 GB. The chip is soldered in the FCBGA1528 package at 46 by 24 mm, so none of these choices change after purchase.

Socket and motherboard compatibility

The 8109U is soldered to the board in the BGA 1528 package and cannot be replaced. Upgrading means replacing the board or the whole laptop, so buyers should choose memory size at order time. The LGA, PGA and BGA: CPU package types explained guide explains soldered package trade offs.

Intel ARK lists Sockets Supported as FCBGA1528 with a 46 by 24 package, which places this 28 W part on BGA 1528 rather than BGA 1526. Boards pair it with compact active cooling tuned for 28 W bursts. Check the laptop maker specs for the configured TDP rather than assuming full 28 W everywhere.

There is no socket retention or aftermarket mounting choice. Service follows the laptop maker manual for fan cleaning. The Intel Core i5-8259U is a four core Iris Plus sibling on the same package for heavier multitasking.

Memory, PCIe and cooling

Memory support covers DDR4-2400 modules or soldered LPDDR3-2133 in two channels up to 32 GB, with up to 37.5 GB per sec of bandwidth. Two channel operation helps the Iris Plus graphics, since it shares system memory beside its eDRAM. Most thin laptops solder 8 GB for cost reasons, so the order time choice matters.

PCI Express arrives as version 3.0 with 16 lanes from the CPU for NVMe storage and board devices. Laptop designs typically wire a single NVMe SSD plus wireless. There is no cooler to swap, so thermal design stays with the maker.

Upgrade paths

There is no CPU upgrade path on BGA 1528. The only moves are a larger SSD where the slot allows it or a whole laptop replacement. Buyers who need four cores should choose the i5 Iris Plus siblings on the same package at order time.

Staying on this board, a clean OS install and matched memory channels help more than chasing clocks. The locked multiplier removes overclocking as a tuning option.