CPU Comparison
Intel Core i5-7640X X-series vs Intel Core i9-9900X
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.
Strong multi-threaded performance for rendering, compilation, and content creation, though newer 10–12 core desktop CPUs deliver better efficiency.
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.
Smooth for high-refresh 1080p and 1440p gaming, but modern mainstream CPUs often match or beat it in lightly-threaded titles while using far less power.
Virtualization
Can run modest VM loads, but core and thread count make it less ideal for multiple concurrent VMs.
Excellent for running multiple VMs thanks to 10 cores, quad-channel memory, and VT-x/VT-d support.
Efficiency
High 112 W TDP for a quad-core design results in lower performance-per-watt than newer mainstream platforms.
High 165 W TDP and 14nm process result in notably higher power draw and heat compared to 7nm and 5nm era desktop and HEDT CPUs.
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 or matrix hardware acceleration.
- Suitable only for CPU-based inference and light ML 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.
- Capable of 1080p high-refresh and 1440p gaming with a modern GPU.
- Single-core performance is competitive but not class-leading versus newer mainstream CPUs.
- PCIe 3.0 x16 is sufficient for current GPUs, but PCIe 4.0/5.0 offer more headroom on newer platforms.
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
- 10 cores and 20 threads for multi-threaded workloads.
- 44 PCIe 3.0 lanes for multi-GPU and fast storage.
- Quad-channel DDR4-2666 with 128 GB capacity support.
- Unlocked multiplier for enthusiast overclocking.
- AVX-512 support for specialized floating-point and vector workloads.
Cons
- High 165 W TDP and 14nm process make it inefficient versus modern CPUs.
- No integrated graphics; discrete GPU required.
- Discontinued platform with limited long-term BIOS and support outlook.
- LGA2066 ecosystem is more expensive and less mainstream than LGA1700/AM5.
- Memory speed capped at DDR4-2666 officially.
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 i9-9900X
- AMD Ryzen Threadripper 2920XRival
HEDT
- RivalCompare head-to-head
- AMD Ryzen 9 3900XRival
High-End Desktop
- RivalCompare head-to-head
- Intel Core i9-9900KRival
Mainstream High-End
- Intel Core i7-14700KAlt
Much better gaming and efficiency, with a longer platform lifespan.
Hybrid architecture with stronger single-thread and gaming performance plus DDR4/DDR5 flexibility.
Compare head-to-head
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 still-capable HEDT CPU for used builds needing PCIe lanes and memory channels, but outclassed in efficiency and value by newer mainstream and HEDT platforms.
Best for: Used or clearance LGA2066 workstation build where you explicitly need 44 PCIe lanes and quad-channel memory on a tight budget.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-7640X X-series or Intel Core i9-9900X?
Based on our editorial ratings, the Intel Core i9-9900X 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 is faster for gaming, Intel Core i5-7640X X-series or Intel Core i9-9900X?
For gaming, the Intel Core i9-9900X leads with a gaming performance score of 78/100 among Intel Core i5-7640X X-series and Intel Core i9-9900X.
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 i9-9900X (165 W).
Do Intel Core i5-7640X X-series and Intel Core i9-9900X use the same socket?
Yes — all of these CPUs use the FCLGA2066 socket, so they share compatible motherboards.
Which has more cores?
The Intel Core i9-9900X has the most cores. Core counts: Intel Core i5-7640X X-series (4 cores), Intel Core i9-9900X (10 cores).