Core i7-840QM vs Core M-5Y51
Core i7-840QM
Core M-5Y51
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 i7-840QM is positioned at rank 812 and the Core M-5Y51 is on rank 1154, so the Core i7-840QM offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Core i7-840QM
Performance Per Dollar Core M-5Y51
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i7-840QM | Core M-5Y51 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($281) |
| Longevity | 🛑 Legacy (Clarksfield (2009−2010) / 45 nm) | 🛑 Legacy (Broadwell-Y (2014) / 14 nm) |
💎 Value Proposition
| Insight | Core i7-840QM | Core M-5Y51 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($281) |
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 i7-840QM and Core M-5Y51
Core i7-840QM
The Core i7-840QM is manufactured by Intel. It was released in 20 June 2010 (15 years ago). It is based on the Clarksfield (2009−2010) architecture. It features 4 cores and 8 threads. Base frequency is 1.86 GHz, with boost up to 3.2 GHz. L3 cache: 8 MB (total). L2 cache: 256 kB (per core). Built on 45 nm process technology. Socket: PGA988. Thermal design power (TDP): 45 Watt. Memory support: DDR3. Passmark benchmark score: 2,025 points. Launch price was $568.
Core M-5Y51
The Core M-5Y51 is manufactured by Intel. It was released in 27 October 2014 (11 years ago). It is based on the Broadwell-Y (2014) architecture. It features 2 cores and 4 threads. Base frequency is 1.1 GHz, with boost up to 2.6 GHz. L3 cache: 4 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: FCBGA1234. Thermal design power (TDP): 4.5 Watt. Memory support: DDR3. Passmark benchmark score: 2,030 points. Launch price was $69.
Processing Power
The Core i7-840QM packs 4 cores / 8 threads, while the Core M-5Y51 offers 2 cores / 4 threads — the Core i7-840QM has 2 more cores. Boost clocks reach 3.2 GHz on the Core i7-840QM versus 2.6 GHz on the Core M-5Y51 — a 20.7% clock advantage for the Core i7-840QM (base: 1.86 GHz vs 1.1 GHz). The Core i7-840QM uses the Clarksfield (2009−2010) architecture (45 nm), while the Core M-5Y51 uses Broadwell-Y (2014) (14 nm). In PassMark, the Core i7-840QM scores 2,025 against the Core M-5Y51's 2,030 — a 0.2% lead for the Core M-5Y51. L3 cache: 8 MB (total) on the Core i7-840QM vs 4 MB (total) on the Core M-5Y51.
| Feature | Core i7-840QM | Core M-5Y51 |
|---|---|---|
| Cores / Threads | 4 / 8+100% | 2 / 4 |
| Boost Clock | 3.2 GHz+23% | 2.6 GHz |
| Base Clock | 1.86 GHz+69% | 1.1 GHz |
| L3 Cache | 8 MB (total)+100% | 4 MB (total) |
| L2 Cache | 256 kB (per core) | 256K (per core) |
| Process | 45 nm | 14 nm-69% |
| Architecture | Clarksfield (2009−2010) | Broadwell-Y (2014) |
| PassMark | 2,025 | 2,030 |
| Geekbench 6 Single | 390 | — |
| Geekbench 6 Multi | 1,050 | — |
Memory & Platform
The Core i7-840QM uses the PGA988 socket (PCIe 2.0), while the Core M-5Y51 uses FCBGA1234 (PCIe 3.0) — making them incompatible on the same motherboard.
| Feature | Core i7-840QM | Core M-5Y51 |
|---|---|---|
| Socket | PGA988 | FCBGA1234 |
| PCIe Generation | PCIe 2.0 | PCIe 3.0+50% |
| Max RAM Speed | DDR3-1333 | — |
| Max RAM Capacity | 8 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 16 | — |
Advanced Features
Virtualization: VT-x, VT-d (Core i7-840QM) / not specified (Core M-5Y51). Primary use case: Core i7-840QM targets Laptop.
| Feature | Core i7-840QM | Core M-5Y51 |
|---|---|---|
| Integrated GPU | No | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | VT-x, VT-d | — |
| Target Use | Laptop | — |
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