CPU Comparison
Intel Core i7-8559U vs Intel Core i7-8705G
A side-by-side comparison of specs, performance and value. The Intel Core i7-8559U is a specialized mobile processor launched in April 2018 as part of the 8th Generation Kaby Lake-U Refresh family. Designed primarily for Apple's MacBook Pro lineup, this chip operates at a higher 28-watt TDP compared to the standard 15W U-series processors. Built on the 14nm process, it features 4 cores and 8 threads. The increased power envelope allows for a significantly higher base clock of 2.7 GHz and a boost clock of up to 4.5 GHz. It includes 8MB of L3 cache and integrates Intel Iris Plus Graphics 655, which features 128MB of embedded DRAM (eDRAM) for enhanced graphical and computational performance. This makes the i7-8559U uniquely capable of handling light gaming and hardware-accelerated video editing without a dedicated GPU. While it runs warmer than standard ultrabook chips, its combination of high clock speeds and powerful integrated graphics makes it a sought-after option for compact, high-performance portable systems.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
High clock speeds ensure excellent performance in office and creative apps.
Strong CPU performance for everyday tasks and light content creation.
Gaming
Iris Plus 655 allows for playable frame rates in older or well-optimized games.
Excellent 1080p gaming performance thanks to the Radeon Vega M GL graphics.
Virtualization
Capable of running light VMs, though limited by 4 cores.
Capable but limited by 4 cores.
Efficiency
28W TDP is efficient enough for laptops but warmer than 15W parts.
HBM2 memory and integrated design improve power efficiency compared to discrete GPUs.
Specialized Performance
AI / ML
- No dedicated AI hardware
- eDRAM can be utilized for certain compute workloads
- Radeon GPU can be used for OpenCL acceleration
- No dedicated AI hardware
Content Creation
Gaming
- Iris Plus 655 is a major step up from UHD 620
- eDRAM helps with texture loading
- Can run macOS games smoothly
- Equivalent to GTX 1050 Ti
- Can run most AAA games at 1080p medium
- VR-ready
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- High 4.5 GHz boost clock
- Iris Plus Graphics with 128MB eDRAM
- 28W TDP allows good sustained performance
- Excellent single-core speed
Cons
- Runs warmer than 15W U-series chips
- Soldered to motherboard
- 14nm process is outdated
- Limited to older platforms
Pros
- Unique Intel-AMD partnership
- Radeon RX Vega M GL graphics
- 4GB of HBM2 memory
- Excellent 1080p gaming in small form factors
Cons
- Driver support has ended
- 65W TDP requires active cooling
- Soldered and non-upgradable
- Limited to 8 PCIe lanes for the GPU
Competitors & Alternatives
Intel Core i7-8559U
- AMD Ryzen 7 2700URival
Mobile
- Compare head-to-headIntel Core i7-8550URival
Mobile
- AMD Ryzen 7 3750HRival
Mobile
- Intel Core i5-8259URival
Mobile
- Apple A12X BionicRival
Mobile
- Alt
Vastly superior performance and efficiency for Mac users.
Compare head-to-head 10th Gen successor with 10nm process and better IPC.
Compare head-to-head- AMD Ryzen 7 4800UAlt
Much better multi-core performance in a similar power bracket.
- Intel Core i7-8665UAlt
Whiskey Lake alternative for business PCs.
- Alt
The modern standard for compact Mac desktops and laptops.
Compare head-to-head
Intel Core i7-8705G
- AMD Ryzen 7 2700URival
Mobile
- Intel Core i7-7700HQRival
Mobile
- AMD Ryzen 7 3750HRival
Mobile
- Compare head-to-headIntel Core i7-8550URival
Mobile
- AMD Ryzen 5 3550HRival
Mobile
10th Gen successor with integrated Iris Plus graphics.
Compare head-to-head- AMD Ryzen 7 4800HAlt
Much better CPU and GPU performance in a similar form factor.
- Alt
Modern alternative with excellent efficiency and integrated graphics.
Compare head-to-head - Intel Core i7-1165G7Alt
Better driver support and modern Xe graphics.
- AMD Ryzen 7 5800UAlt
Superior performance and battery life for thin-and-light laptops.
Our Verdict on Each
A premium 28W mobile processor that combined high clock speeds with powerful Iris Plus graphics, delivering an excellent balance of CPU and GPU performance.
Best for: If you are considering a laptop with the Intel Core i7-8559U, you are likely looking at a used MacBook Pro or a premium NUC. This processor remains highly capable for everyday productivity, programming, and light 1080p video editing. The inclusion of Iris Plus graphics with eDRAM provides a noticeable boost in graphical tasks compared to standard U-series chips. It is an excellent choice for users who need a compact, moderately powerful machine without paying the premium for Apple Silicon. However, be aware that it is an Intel-based Mac, meaning it will eventually lose macOS support. Avoid this processor if you need to run modern AAA games or heavy 3D rendering workloads. It is best purchased at a discount for general use and legacy software.
Read the full reviewA revolutionary processor that combined Intel and AMD silicon to deliver exceptional gaming performance in compact form factors.
Best for: If you are considering a device with the Intel Core i7-8705G, you are likely looking at a used NUC or a thin-and-light gaming laptop like the Dell XPS 15 9575. This processor remains a highly capable solution for 1080p gaming and VR, offering performance comparable to a GTX 1050 Ti in an incredibly compact form factor. It is an excellent choice for budget gamers or media creators who need a portable machine with dedicated graphics. However, driver support from Intel for the Radeon component has ended, meaning you may encounter compatibility issues with the latest games. Avoid this processor if you want a future-proof system or need the latest API support. It is best purchased at a discount for its unique hardware design and solid 1080p performance.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i7-8559U or Intel Core i7-8705G?
Based on our editorial ratings, the Intel Core i7-8705G comes out ahead with a score of 9/10. 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, Intel Core i7-8559U or Intel Core i7-8705G?
For gaming, the Intel Core i7-8705G leads with a gaming performance score of 80/100 among Intel Core i7-8559U and Intel Core i7-8705G.
Which uses less power?
The Intel Core i7-8559U has the lowest rated TDP. Power draw across these chips: Intel Core i7-8559U (28 W), Intel Core i7-8705G (65 W).
Do Intel Core i7-8559U and Intel Core i7-8705G use the same socket?
No. They use different sockets (Intel Core i7-8559U: Intel BGA 1356, Intel Core i7-8705G: Intel BGA 2270), so each needs a compatible motherboard.