CPU Comparison
Core i5-1245U vs Intel Core i7-1255U
A side-by-side comparison of specs, performance and value. The Intel Core i5-1245U is a mobile processor designed for thin-and-light laptops, offering a balanced approach to everyday computing. As part of the Alder Lake-U family, it features 10 cores and 12 threads, utilizing a hybrid architecture of 2 Performance-cores and 8 Efficient-cores. This design allows it to handle bursty workloads efficiently while maintaining excellent battery life. Unlike its sibling, the 1235U, the 1245U steps up the base clock speed to 1.6 GHz on its P-cores, offering slightly snappier response times in everyday tasks. With a 15W base TDP and the ability to boost up to 55W for short bursts, it adapts dynamically to thermal conditions. Integrated Iris Xe graphics with 80 Execution Units handle light gaming and media decoding with ease. This chip is a solid choice for professionals needing reliable performance in a portable form factor.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Excellent for office apps, heavy browsing, and light coding.
Highly responsive for daily office tasks, with plenty of E-cores to keep background apps from slowing down the system.
Gaming
Good for casual and older titles at 1080p low settings.
Can run esports games like League of Legends smoothly, but struggles with modern AAA titles on integrated graphics.
Virtualization
Can handle light VMs, but memory bandwidth is a limit.
Good for light Docker containers, but 2 P-cores limit performance when running full Windows VMs.
Efficiency
Dynamic power management ensures excellent battery life.
Excellent power management ensures long battery life during typical office use.
Specialized Performance
AI / ML
- Intel GNA 3.0 for background AI tasks
- No NPU
- AI workloads handled by CPU/GPU
Content Creation
Gaming
- Can run eSports titles at 60fps
- Shares system memory, so RAM speed affects FPS
- Iris Xe 96EU handles 1080p low settings for older games
- Throttles under sustained 3D loads
- Best paired with a discrete GPU for serious gaming
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Excellent balance of performance and 15W power draw
- 10 cores for heavy multitasking
- Supports fast DDR5 memory
- Strong single-core performance for an ultrabook chip
- Good integrated graphics
Cons
- Not suitable for heavy gaming
- Locked multiplier
- Soldered to motherboard
- Can run warm under sustained all-core loads
Pros
- Excellent performance-per-watt
- Very flexible memory support
- Good single-core burst performance
- Plenty of PCIe lanes for an ultrabook chip
- Reliable Iris Xe integrated graphics
Cons
- Only 2 P-cores limit heavy multi-threading
- Soldered to the motherboard
- Can get warm during 55W turbo bursts
- Not suitable for gaming without a discrete GPU
Competitors & Alternatives
Core i5-1245U
- AMD Ryzen 5 5625URival
Mobile
- AMD Ryzen 7 5825URival
Mobile
- Compare head-to-headIntel Core i7-1255URival
Mobile
- Compare head-to-headIntel Core i5-1235URival
Mobile
- Compare head-to-headApple M1Rival
Mobile
Better graphics and slightly higher clocks for premium ultrabooks.
Compare head-to-headMore P-cores for better sustained performance.
Compare head-to-head- Intel Core i5-1230UAlt
Lower TDP variant for ultimate portability.
Budget alternative for basic office tasks.
Compare head-to-head
Intel Core i7-1255U
- AMD Ryzen 7 7730URival
Mobile
- AMD Ryzen 7 6800URival
Mobile
- Compare head-to-headApple M2Rival
Mobile
- AMD Ryzen 5 6600URival
Mobile
- Intel Core i7-1185G7Rival
Mobile
Offers slightly higher clock speeds (4.8 GHz) for marginally better burst performance.
Compare head-to-headA more cost-effective alternative that offers very similar everyday performance.
Compare head-to-headBetter sustained performance if you can accommodate the 28W TDP.
Compare head-to-head- AMD Ryzen 7 7735UAlt
Strong alternative with better integrated graphics efficiency.
- Intel Core i7-1355UAlt
The 13th Gen successor with refined efficiency and clock speeds.
Our Verdict on Each
A highly efficient U-series processor that hits the sweet spot for everyday productivity and portable computing.
Best for: Mainstream thin-and-light laptops
Read the full reviewA highly efficient and popular 15W processor that powers a vast majority of mid-range premium ultrabooks, offering great daily responsiveness.
Best for: Buying a standard ultrabook for school or office work where you need strong battery life and snappy daily performance.
Read the full reviewFrequently Asked Questions
Which is better, Core i5-1245U or Intel Core i7-1255U?
Based on our editorial ratings, the Core i5-1245U comes out ahead with a score of 8.6/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which is faster for gaming, Core i5-1245U or Intel Core i7-1255U?
For gaming, the Intel Core i7-1255U leads with a gaming performance score of 64/100 among Core i5-1245U and Intel Core i7-1255U.
Which uses less power?
The Core i5-1245U has the lowest rated TDP. Power draw across these chips: Core i5-1245U (15 W), Intel Core i7-1255U (55 W).
Do Core i5-1245U and Intel Core i7-1255U use the same socket?
Yes — all of these CPUs use the Intel BGA 1744 socket, so they share compatible motherboards.