CPU Comparison
Intel Core i5-7640X X-series vs Intel Core i7-7740X
A side-by-side comparison of specs, performance and value. The Intel Core i5-7640X is a quad-core, four-thread desktop processor on the LGA2066 platform with base and boost clocks of 4.0 GHz and 4.2 GHz, respectively, dual-channel DDR4-2666 memory, and 16 PCIe 3.0 lanes.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Gaming
Virtualization
Efficiency
Specialized Performance
AI / ML
- No dedicated AI acceleration; CPU-bound inference only.
- Lacks AVX-512; limited to SSE4.1/4.2 and AVX2 instruction sets.
- No dedicated AI acceleration hardware
- Suited only for CPU-bound inference and older ML frameworks
Content Creation
Gaming
- High clocks help in CPU-bound scenarios, but modern games increasingly benefit from more cores/threads.
- Requires a discrete GPU; no integrated graphics.
- Performance comparable to contemporary mainstream Kaby Lake i5s when GPU-bound.
- 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
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- High base and boost clock speeds
- Unlocked multiplier for overclocking
- Supports Intel Optane Memory
- VT-x and VT-d virtualization support
- DDR4-2666 dual-channel memory support
Cons
- No integrated graphics requires a discrete GPU
- No Hyper-Threading; only four threads
- Only dual-channel memory on a HEDT platform
- Only 16 CPU PCIe 3.0 lanes
- Discontinued platform with limited upgrade options
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
Competitors & Alternatives
Intel Core i5-7640X X-series
- AMD Ryzen 5 1600Rival
Mainstream
- AMD Ryzen 5 1500XRival
Mainstream
- Intel Core i5-7600KRival
Mainstream
- Intel Core i7-7700KRival
Mainstream
- Intel Core i7-7740XRival
HEDT
- Intel Core i5-8400Alt
Six-core mainstream Coffee Lake with better multi-threaded performance.
- AMD Ryzen 5 2600Alt
Six cores, 12 threads on AM4 with superior efficiency and upgrade path.
- Intel Core i5-9600KAlt
Later-generation six-core with higher clocks and improved platform longevity.
- AMD Ryzen 5 3600Alt
Zen 2 six-core with much higher IPC and efficiency on AM4.
- Intel Core i5-10600KAlt
Six-core, 12-thread Comet Lake on modern platform with DDR4 and better connectivity.
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
- Intel Core i7-7820XRival
Workstation
- Intel Core i7-8700KAlt
More cores and better value for gaming and productivity.
- AMD Ryzen 7 2700XAlt
Higher multi-threaded performance and efficiency.
- Intel Core i9-9900KAlt
Strong all-round performance on mainstream platforms.
- Intel Core i7-9700KAlt
More cores and newer platform features.
- AMD Ryzen 5 3600Alt
Much better performance per watt and platform longevity.
Our Verdict on Each
A capable but ill-positioned quad-core for the X299 HEDT platform, offering strong clock speeds yet lacking Hyper-Threading, integrated graphics, and the multi-threaded punch of contemporaries; mainly relevant today for specific upgrades or used-market builds.
Best for: Upgrading an existing X299 system on a tight budget or acquiring used parts at low cost
Read the full reviewA 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 reviewFrequently Asked Questions
Which is better, Intel Core i5-7640X X-series or Intel Core i7-7740X?
Based on our editorial ratings, the Intel Core i7-7740X comes out ahead with a score of 7/10. 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 i5-7640X X-series or Intel Core i7-7740X?
For gaming, the Intel Core i7-7740X leads with a gaming performance score of 78/100 among Intel Core i5-7640X X-series and Intel Core i7-7740X.
Do Intel Core i5-7640X X-series and Intel Core i7-7740X use the same socket?
No. They use different sockets (Intel Core i5-7640X X-series : FCLGA2066, Intel Core i7-7740X: LGA2066), so each needs a compatible motherboard.