CPU Comparison
Intel Core i7-7740X vs Intel Core i9-9900K
A side-by-side comparison of specs, performance and value. The Intel Core i7-7740X is a quad-core, eight-thread desktop processor from the Kaby Lake-X family, designed for the LGA2066 (X299) platform with 14 nm manufacturing, a base clock of 4.30 GHz, and a max turbo of 4.50 GHz.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Quad-core limits performance in heavily parallelized applications compared to higher core-count alternatives.
Strong multi-threaded performance for photo editing, video encoding, and compilation, though outpaced by newer 8+ core CPUs with better IPC and efficiency.
Gaming
Paired with a strong discrete GPU, the high clocks enable smooth high-refresh gaming, though newer platforms offer better efficiency and future-proofing.
Still delivers high FPS in modern titles at 1080p, but is increasingly GPU-bound at 1440p/4K and trails newer gaming-focused CPUs in 1% low frame rates and efficiency.
Virtualization
Adequate for light VM workloads, but limited core count and memory channels make it less suitable for heavy virtualization.
Capable for home labs and light VM workloads with 8 cores and 16 threads, but limited by 128 GB memory cap and older platform features.
Efficiency
112 W TDP for a quad-core results in higher power draw per core than many modern designs.
Power draw is high under multi-threaded loads, often exceeding 150 W in practice, with significantly worse performance-per-watt than modern Intel and AMD alternatives.
Specialized Performance
AI / ML
- No dedicated AI acceleration hardware
- Suited only for CPU-bound inference and older ML frameworks
- No dedicated AI or NPU hardware.
- Suitable only for CPU-based inference at small scale.
- Modern CPUs with NPUs or faster AVX implementations are far better for local AI workloads.
Content Creation
Gaming
- Strong single-threaded core performance keeps frame rates competitive in many titles
- Best paired with mid-to-high-end discrete GPUs
- Modern gaming CPUs with more cores and faster memory often deliver better 1% lows
- Single-core and high turbo frequencies benefit high-refresh-rate gaming.
- At 1080p with a strong GPU it can still push very high average FPS.
- At 1440p and above, differences versus newer CPUs shrink as the GPU becomes the bottleneck.
- Modern 6+ core CPUs often match or beat it in 1% lows and frame pacing.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- High out-of-box clocks
- Unlocked for overclocking
- X299 platform offers flexible chipset PCIe lanes and storage options
- Strong single-threaded performance for its era
- Can breathe life into idle LGA2066 boards
Cons
- Quad core count limits multi-threaded performance
- Only 16 CPU PCIe lanes
- No integrated graphics
- 112 W TDP for four cores is relatively power-hungry
- Platform is discontinued with limited future upgrade options
Pros
- 8 cores and 16 threads still handle modern workloads well.
- 5.0 GHz single-core turbo benefits gaming and snappy UI response.
- STIM and unlocked multiplier make overclocking straightforward.
- Mature LGA1151 platform with many affordable Z390/Z370 boards.
- Strong single-thread performance for its era.
Cons
- High power draw and heat under multi-threaded loads.
- End-of-life platform with no DDR5 or PCIe 4.0/5.0.
- 128 GB memory cap is limiting for heavy VM or data workloads.
- Older 14 nm++ process is much less efficient than modern nodes.
- Newer CPUs offer better performance-per-watt and platform features.
Competitors & Alternatives
Intel Core i7-7740X
- AMD Ryzen 5 1600XRival
Gaming & Productivity
- AMD Ryzen 7 1700Rival
Creator
- Intel Core i7-7700KRival
Gaming
- Intel Core i5-7640XRival
Gaming
- Compare head-to-headIntel Core i7-7820XRival
Workstation
More cores and better value for gaming and productivity.
Compare head-to-head- AMD Ryzen 7 2700XAlt
Higher multi-threaded performance and efficiency.
Strong all-round performance on mainstream platforms.
Compare head-to-headMore cores and newer platform features.
Compare head-to-head- AMD Ryzen 5 3600Alt
Much better performance per watt and platform longevity.
Intel Core i9-9900K
- AMD Ryzen 7 2700XRival
Enthusiast Desktop
- Compare head-to-headIntel Core i7-9700KRival
Enthusiast Desktop
- Compare head-to-headIntel Core i7-8700KRival
Enthusiast Desktop
- AMD Ryzen 7 3800XRival
Enthusiast Desktop
- Compare head-to-headIntel Core i9-10900KRival
Enthusiast Desktop
More cores and threads, better efficiency, DDR4/DDR5 support, and stronger modern performance for a similar or lower price point.
Compare head-to-head- AMD Ryzen 7 5800XAlt
Higher IPC, better efficiency, and AM4 upgrade path with similar core counts; often better value in 2026.
Hybrid architecture with more E-cores and better multi-threaded performance at lower power, plus DDR5 support.
Compare head-to-head- AMD Ryzen 5 7600Alt
Modern AM5 platform with DDR5 and much better efficiency; sufficient for gaming and light content work.
- Intel Core i5-12400Alt
Budget-friendly LGA1700 option with strong single-thread performance and better platform longevity.
Our Verdict on Each
A niche, high-clock quad-core for X299 that delivers strong single-threaded performance but lacks the PCIe and memory bandwidth of Skylake-X siblings, making sense only at low prices for specific reuse scenarios.
Best for: Reusing an existing LGA2066 board for gaming or general tasks when the CPU is acquired at very low cost.
Read the full reviewStill a capable gaming and multi-threaded CPU in 2026, especially if you already own it, but outdated platform features, high power draw, and better modern alternatives make it hard to recommend for new builds.
Best for: Upgrading an existing LGA1151 system from an older i5/i7 to more cores without changing motherboard and RAM.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i7-7740X or Intel Core i9-9900K?
Based on our editorial ratings, the Intel Core i9-9900K comes out ahead with a score of 8/10. 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 Intel Core i9-9900K has the lowest rated TDP. Power draw across these chips: Intel Core i7-7740X (112 W), Intel Core i9-9900K (95 W).
Do Intel Core i7-7740X and Intel Core i9-9900K use the same socket?
No. They use different sockets (Intel Core i7-7740X: LGA2066, Intel Core i9-9900K: LGA1151 (FCLGA1151)), so each needs a compatible motherboard.
Which has more cores?
The Intel Core i9-9900K has the most cores. Core counts: Intel Core i7-7740X (4 cores), Intel Core i9-9900K (8 cores).
Which is faster in multi-core benchmarks?
The Intel Core i9-9900K posts the highest multi-core benchmark score. Multi-core results: Intel Core i9-9900K (8,200). Benchmark figures are approximate and workload-dependent.