Core i7-8665UE vs FX-8140
Core i7-8665UE
FX-8140
Performance Spectrum - CPU
About PassMark
PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money. The Core i7-8665UE is positioned at rank 1037 and the FX-8140 is on rank 759, so the FX-8140 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Core i7-8665UE
Performance Per Dollar FX-8140
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i7-8665UE | FX-8140 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($409) | ✅ More affordable ($120) |
| Longevity | ✨ Modern (Whiskey Lake-U (2018−2019) / 14 nm) | 🛑 Legacy (Zambezi (2011−2012) / 32 nm) |
💎 Value Proposition
| Insight | Core i7-8665UE | FX-8140 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+241%) |
| Upfront Cost | ⚠️ Higher cost ($409) | ✅ More affordable ($120) |
Performance Check
To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.
Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.
Technical Specifications
Side-by-side comparison of Core i7-8665UE and FX-8140
Core i7-8665UE
The Core i7-8665UE is manufactured by Intel. It was released in 1 October 2018 (7 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 4 cores and 8 threads. Base frequency is 1.7 GHz, with boost up to 4.4 GHz. L3 cache: 8 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 4,852 points. Launch price was $409.
FX-8140
The FX-8140 is manufactured by AMD. It was released in 23 October 2012 (13 years ago). It is based on the Zambezi (2011−2012) architecture. It features 8 cores and 8 threads. Base frequency is 3.2 GHz, with boost up to 4.1 GHz. L3 cache: 8 MB (total). L2 cache: 8 MB. Built on 32 nm process technology. Socket: AM3+. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 4,860 points. Launch price was $69.
Processing Power
The Core i7-8665UE packs 4 cores / 8 threads, while the FX-8140 offers 8 cores / 8 threads — the FX-8140 has 4 more cores. Boost clocks reach 4.4 GHz on the Core i7-8665UE versus 4.1 GHz on the FX-8140 — a 7.1% clock advantage for the Core i7-8665UE (base: 1.7 GHz vs 3.2 GHz). The Core i7-8665UE uses the Whiskey Lake-U (2018−2019) architecture (14 nm), while the FX-8140 uses Zambezi (2011−2012) (32 nm). In PassMark, the Core i7-8665UE scores 4,852 against the FX-8140's 4,860 — a 0.2% lead for the FX-8140. Both processors carry 8 MB (total) of L3 cache.
| Feature | Core i7-8665UE | FX-8140 |
|---|---|---|
| Cores / Threads | 4 / 8 | 8 / 8+100% |
| Boost Clock | 4.4 GHz+7% | 4.1 GHz |
| Base Clock | 1.7 GHz | 3.2 GHz+88% |
| L3 Cache | 8 MB (total) | 8 MB (total) |
| L2 Cache | 256 kB (per core) | 8 MB+3100% |
| Process | 14 nm-56% | 32 nm |
| Architecture | Whiskey Lake-U (2018−2019) | Zambezi (2011−2012) |
| PassMark | 4,852 | 4,860 |
Memory & Platform
The Core i7-8665UE uses the FCBGA1528 socket (PCIe 3.0), while the FX-8140 uses AM3+ (PCIe 2.0) — making them incompatible on the same motherboard.
| Feature | Core i7-8665UE | FX-8140 |
|---|---|---|
| Socket | FCBGA1528 | AM3+ |
| PCIe Generation | PCIe 3.0+50% | PCIe 2.0 |
| Max RAM Speed | DDR4-2400 | — |
| Max RAM Capacity | 64 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 16 | — |
Advanced Features
Virtualization: VT-x, VT-d (Core i7-8665UE) / not specified (FX-8140). The Core i7-8665UE includes integrated graphics (UHD Graphics 620), while the FX-8140 requires a dedicated GPU. Primary use case: Core i7-8665UE targets Embedded.
| Feature | Core i7-8665UE | FX-8140 |
|---|---|---|
| Integrated GPU | Yes | — |
| IGPU Model | UHD Graphics 620 | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | VT-x, VT-d | — |
| Target Use | Embedded | — |
Value Analysis
The Core i7-8665UE launched at $409 MSRP, while the FX-8140 debuted at $225. At current prices ($409 vs $120), the FX-8140 is $289 cheaper. In terms of value (PassMark points per dollar), the Core i7-8665UE delivers 11.9 pts/$ vs 40.5 pts/$ for the FX-8140 — making the FX-8140 the 109.4% better value option.
| Feature | Core i7-8665UE | FX-8140 |
|---|---|---|
| MSRP | $409 | $225-45% |
| Avg Price (30d) | $409 | $120-71% |
| Performance per Dollar | 11.9 | 40.5+240% |
| Release Date | 2018 | 2012 |
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