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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)
- 2,130Bottom 25%
- Geekbench 6 (multi)
- 6,600Bottom 17%
- Cinebench R23 (single)
- 1,600Bottom 41%
- Cinebench R23 (multi)
- 6,800Bottom 20%
- PassMark
- 12,941Bottom 25%
- 3DMark Time Spy Graphics (iGPU)
- 1,496Top 42%
Quick answers
Is the Intel Core i7-1255U good in 2026?
The Intel Core i7-1255U earns an Inno Score of 48.6/100 (“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.
Does the Intel Core i7-1255U count as "Core i7 or equivalent"?
Its PassMark CPU Mark average is 12,941 (cpubenchmark.net, retrieved Sep 26, 2026), which puts it in Tier C of our CPU tier checker: older or low-power Core i7, and many recent Core i5 chips. Requirement pages word this differently, so check the exact wording with your department.
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 5 7530U, Intel Core i5-12500H, Qualcomm Snapdragon X X1-26-100 — open the comparison pages for a spec-by-spec breakdown.
