Intel Core i7-1255U socket: BGA 1744

What the Core i7-1255U is

The Intel Core i7-1255U is a 10-core, 12-thread member of the Alder Lake-U family from February 2022. Two Performance-cores with eight Efficient-cores give 12 threads, with base at 1.7 GHz and up to 4.7 GHz boost. The package carries 12 MB of Intel Smart Cache. Processor base power is 15 W with turbo up to 55 W.

Memory support covers DDR5 up to 4800 MT/s, DDR4 up to 3200 MT/s, LPDDR5 up to 5200 MT/s and LPDDR4x up to 4267 MT/s, two channels, up to 64 GB. Two channels feed the Zen 3 cores, and laptop makers choose DDR4 SODIMM or soldered LPDDR4x at order time. Eight Gen3 lanes from the CPU wire NVMe storage. Intel Iris Xe Graphics (96 execution units) drives laptop displays with hardware video decode.

Mainstream thin laptops take this 10-core part for study and office work with long battery expectations. Two Performance-cores with eight Efficient-cores keep multitasking smooth at 15 W. A nearby option is Intel Core i7-1265U on the same package, which lifts clocks for heavier duty.

Socket and motherboard compatibility

The Core i7-1255U fits the BGA 1744 soldered package. The chip is soldered and cannot be replaced. Makers solder it with cooling for the 15 W band, so configuration happens once at order time.

There is no socketed variant and no board choice beyond the system design. Memory type and expansion follow the laptop design. Systems on the same package span several core counts, so makers reuse layouts across the stack.

Memory, PCIe and cooling

DDR5 up to 4800 MT/s, DDR4 up to 3200 MT/s, LPDDR5 up to 5200 MT/s and LPDDR4x up to 4267 MT/s, two channels, up to 64 GB. Matched DIMMs hold the rated speed across all populated channels.

Gen3 lanes from the CPU wire NVMe storage and board devices, with the split fixed per laptop design.

Cooling follows the chassis across 15 W base with turbo headroom. No boxed cooler exists. Long sessions settle at the sustained power the body can reject, so cooling reviews of the exact model matter.

Fit in thin laptops

Thin-and-light laptops take this 10-core part where 15 W must cover office work, study and video meetings through the day. Two Performance-cores with eight Efficient-cores keep multitasking smooth while the 55 W turbo headroom covers short bursts. Battery life depends on display size and brightness as much as on the processor.

Iris Xe graphics with 96 execution units drive the laptop display with hardware video decode, so streaming stays efficient on battery. Laptop makers choose DDR5, DDR4 or soldered LPDDR memory at order time, and dual-channel fitting keeps graphics pace up. Buyers compare memory size and screen quality alongside core counts.

Upgrade paths

No CPU upgrade exists on soldered boards. The lineup moves from fewer cores through this 10-core part to options such as Intel Core i7-1265U, chosen at purchase with display and memory. Storage and SODIMM memory where fitted are the only later changes.

Beyond this generation the replacement is a whole laptop on newer platforms with faster memory. The LGA, PGA and BGA: CPU package types explained guide explains the soldered tradeoff behind mobile designs.