CPU Comparison
Core i7-7740X vs Core i7-7800X
A side-by-side comparison of specs, performance and value. The Intel Core i7-7740X is a unique high-end desktop (HEDT) processor launched in June 2017. Based on the Kaby Lake-X architecture, it is essentially a mainstream quad-core die repurposed for the enthusiast LGA 2066 socket. Featuring 4 cores and 8 threads, it operates at a high base frequency of 4.3 GHz and boosts up to 4.6 GHz, catering specifically to users seeking maximum single-threaded performance. The X suffix denotes an unlocked multiplier, allowing for further overclocking. With a 112W TDP, it demands robust cooling. Notably, it lacks integrated graphics and does not support quad-channel memory, differentiating it from true HEDT Skylake-X parts. It includes 8MB of L3 cache and supports dual-channel DDR4 memory. The i7-7740X was a controversial product, offering little practical benefit over the cheaper LGA 1151 i7-7700K, but it allowed enthusiasts to access high clock speeds on the X299 platform, albeit with a limited feature set.
The Bottom Line
Overview & Launch
Specifications Compared
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- High single-core frequencies
- Unlocked for overclocking
- Access to X299 chipset features
Cons
- Only 4 cores on an HEDT platform
- Limited to dual-channel memory
- No integrated graphics
- Poor value compared to true HEDT or mainstream parts
Pros
- Quad-channel memory support
- 28 PCIe lanes for expansion
- Good multi-threaded performance
- AVX-512 support
Cons
- High 140W TDP
- Runs very hot under load
- Lacks integrated graphics
- Outdated 14nm process
Competitors & Alternatives
Core i7-7740X
- Intel Core i7-7700KRival
Performance Desktop
- Compare head-to-headIntel Core i7-7800XRival
High-End Desktop
- AMD Ryzen 7 1800XRival
High-End Desktop
- Intel Core i5-7640XRival
High-End Desktop
- AMD Ryzen 5 1600XRival
Performance Desktop
- AMD Ryzen 7 1700Alt
More cores and better multi-threading for less money.
Actual high-end HEDT performance.
Compare head-to-head- AMD Threadripper 1900XAlt
Better HEDT platform features and core count.
Core i7-7800X
- AMD Ryzen 5 1600XRival
Mainstream Desktop
- Compare head-to-headIntel Core i7-7820XRival
High-End Desktop
- AMD Ryzen Threadripper 1900XRival
High-End Desktop
- Compare head-to-headIntel Core i7-6800KRival
High-End Desktop
- AMD Ryzen 7 1800XRival
High-End Desktop
Better gaming performance on a mainstream platform.
Compare head-to-head- AMD Ryzen 7 3700XAlt
Much more efficient and faster modern alternative.
True high-end HEDT performance with 10 cores.
Compare head-to-head
Our Verdict on Each
An oddity in Intel's lineup, offering high clocks but limited core count and features for the HEDT platform. Hard to recommend over mainstream alternatives.
Best for: Niche collection or specific legacy X299 troubleshooting
Read the full reviewA solid entry into Intel's HEDT platform, offering good multi-threaded performance and ample expansion, though it runs hot and is outdated by modern standards.
Best for: Cheap used workstation build
Read the full reviewFrequently Asked Questions
Which is better, Core i7-7740X or Core i7-7800X?
Based on our editorial ratings, the Core i7-7800X comes out ahead with a score of 7.5/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which uses less power?
The Core i7-7740X has the lowest rated TDP. Power draw across these chips: Core i7-7740X (112 W), Core i7-7800X (140 W).
Do Core i7-7740X and Core i7-7800X use the same socket?
Yes — all of these CPUs use the LGA 2066 socket, so they share compatible motherboards.
Which has more cores?
The Core i7-7800X has the most cores. Core counts: Core i7-7740X (4 cores), Core i7-7800X (6 cores).