Intel
Intel Core i7-1255U
A 15W ultrabook chip with an unusual shape: just two performance cores backed by eight efficiency cores. Bursty single-threaded work feels quick, but sustained multi-core loads expose how little P-core silicon is actually in here.
Pros
- Fast 4.7GHz single-core burst for a 15W part
- Ten cores keep background tasks off the P-cores
- Full 96-EU Iris Xe graphics
- Fits fanless and thin-and-light designs
Cons
- Only two performance cores limits sustained work
- Multi-core throughput trails 8-core Ryzen U chips
- Intel 7 node hurts battery life
- Performance swings wildly with chassis cooling
Below average
Computed from specs & benchmarks via our public methodology.
Full specifications
Everything we track for the Intel Core i7-1255U
General
- Announced
- 2022
- Process
- 10 nm
- Base TDP
- 15 W
- Max TDP
- 55 W
Cores & Clocks
- Cores
- 10
- Performance cores
- 2
- Efficiency cores
- 8
- Threads
- 12
- Base clock
- 1.7 GHz
- Boost clock
- 4.7 GHz
- L3 cache
- 12 MB
Integrated GPU
- iGPU
- Intel Iris Xe (96 EU)
- iGPU clock
- 1,250 MHz
Memory
- Memory support
- LPDDR5-5200 / DDR5-4800 / LPDDR4X-4267
- Max memory
- 64 GB
Benchmarks
- Geekbench 6 (single)
- 2,130
- Geekbench 6 (multi)
- 6,600
- Cinebench R23 (single)
- 1,600
- Cinebench R23 (multi)
- 6,800
- PassMark
- 13,000
Quick answers
Is the Intel Core i7-1255U good in 2026?
The Intel Core i7-1255U earns an Inno Score of 37.8/100 (“Below average”) based on its specs and benchmark results. A 15W ultrabook chip with an unusual shape: just two performance cores backed by eight efficiency cores. Bursty single-threaded work feels quick, but sustained multi-core loads expose how little P-core silicon is actually in here.
What are the key specs of the Intel Core i7-1255U?
Cores: 10 · Threads: 12 · Boost clock: 4.7 GHz · Base TDP: 15 W
What are the closest alternatives to the Intel Core i7-1255U?
Its closest rivals on InnoReviews are AMD Ryzen 7 5800H, Intel Core i5-12500H, AMD Ryzen 5 7535HS — open the comparison pages for a spec-by-spec breakdown.
