CPU Comparison
Intel Core i5-7640X X-series vs Intel Core i7-7800X
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
Four cores with no Hyper-Threading limit multi-threaded workloads; better suited to light productivity than heavy rendering or compiling.
Handles multi-threaded productivity tasks reasonably well, though newer platforms overtake it in performance-per-watt.
Gaming
Sufficient for high-refresh gaming when paired with a strong GPU, but constrained by lack of Hyper-Threading and limited core count in modern titles.
Adequate for 1080p and 1440p with a strong GPU, but modern gaming CPUs deliver higher frame rates and better efficiency.
Virtualization
Can run modest VM loads, but core and thread count make it less ideal for multiple concurrent VMs.
Quad-channel memory and 12 threads suit multiple VMs and developer workloads.
Efficiency
High 112 W TDP for a quad-core design results in lower performance-per-watt than newer mainstream platforms.
High power draw relative to performance makes it less efficient than current-generation chips.
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.
- AVX-512 accelerates some inference workloads on CPU
- No dedicated NPU or matrix engines
- Suitable only for light or experimental AI workloads
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.
- Supports high-refresh gaming with capable GPUs
- Lacks the single-thread uplift of newer architectures
- Requires discrete graphics
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
- Quad-channel DDR4 memory
- Unlocked for overclocking
- AVX-512 support
- 12 threads for multi-threaded workloads
- 28 PCIe 3.0 lanes from CPU
Cons
- No integrated graphics
- Higher power consumption relative to modern CPUs
- Only 28 PCIe lanes vs higher-tier X-series SKUs
- Discontinued platform with limited upgrade path
- Memory officially limited to DDR4-2400
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 i7-7800X
- AMD Ryzen 7 1700Rival
Creator
- AMD Ryzen 7 1800XRival
Creator
- AMD Ryzen Threadripper 1920XRival
Workstation
- AMD Ryzen Threadripper 1950XRival
Workstation
- Intel Core i7-7820XRival
HEDT
- Intel Core i7-9700KAlt
Higher gaming performance on mainstream platform with lower power draw.
- AMD Ryzen 9 3900XAlt
More cores, higher efficiency, and newer platform with PCIe 4.0 support.
- Intel Core i9-9900KAlt
Strong single-thread performance suitable for gaming and productivity.
- AMD Ryzen 7 5800XAlt
Modern Zen 3 architecture with excellent single and multi-threaded performance.
- Intel Core i7-13700KAlt
Current-gen hybrid architecture with high core counts and PCIe 5.0.
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 reviewThe i7-7800X offers quad-channel memory and decent multi-core performance for its era, but higher power draw and limited PCIe lanes make it a niche choice today versus modern mainstream platforms.
Best for: Budget upgrade on existing X299 platform with DDR4 investment
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-7640X X-series or Intel Core i7-7800X?
Based on our editorial ratings, the Intel Core i7-7800X 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 i7-7800X?
For gaming, the Intel Core i7-7800X leads with a gaming performance score of 76/100 among Intel Core i5-7640X X-series and Intel Core i7-7800X.
Which uses less power?
The Intel Core i5-7640X X-series has the lowest rated TDP. Power draw across these chips: Intel Core i5-7640X X-series (112 W), Intel Core i7-7800X (140 W).
Do Intel Core i5-7640X X-series and Intel Core i7-7800X use the same socket?
No. They use different sockets (Intel Core i5-7640X X-series: FCLGA2066, Intel Core i7-7800X: LGA2066), so each needs a compatible motherboard.
Which has more cores?
The Intel Core i7-7800X has the most cores. Core counts: Intel Core i5-7640X X-series (4 cores), Intel Core i7-7800X (6 cores).