Core i7-6900K vs Core i5-10400F
Core i7-6900K
Core i5-10400F
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.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Core i7-6900K
Performance Per Dollar Core i5-10400F
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i7-6900K | Core i5-10400F |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($1,089) | ✅ More affordable ($102) |
| Longevity | 🛑 Legacy (Broadwell-E (2016) / 14 nm) | ✨ Modern (Comet Lake (2020−2025) / 14 nm) |
💎 Value Proposition
| Insight | Core i7-6900K | Core i5-10400F |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+847%) |
| Upfront Cost | ⚠️ Higher cost ($1,089) | ✅ More affordable ($102) |
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 i7-6900K and Core i5-10400F
Core i7-6900K
The Core i7-6900K is manufactured by Intel. It was released in 31 May 2016 (9 years ago). It is based on the Broadwell-E (2016) architecture. It features 8 cores and 16 threads. Base frequency is 3.2 GHz, with boost up to 4 GHz. L3 cache: 20 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: LGA2011. Thermal design power (TDP): 140 Watt. Memory support: DDR4. Passmark benchmark score: 14,682 points. Launch price was $1,020.
Core i5-10400F
The Core i5-10400F is manufactured by Intel. It was released in 30 April 2020 (5 years ago). It is based on the Comet Lake (2020−2025) architecture. It features 6 cores and 12 threads. Base frequency is 2.9 GHz, with boost up to 4.3 GHz. L3 cache: 12 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1200. Thermal design power (TDP): 65 Watt. Memory support: DDR4. Passmark benchmark score: 13,029 points. Launch price was $155.
Processing Power
The Core i7-6900K packs 8 cores / 16 threads, while the Core i5-10400F offers 6 cores / 12 threads — the Core i7-6900K has 2 more cores. Boost clocks reach 4 GHz on the Core i7-6900K versus 4.3 GHz on the Core i5-10400F — a 7.2% clock advantage for the Core i5-10400F (base: 3.2 GHz vs 2.9 GHz). The Core i7-6900K uses the Broadwell-E (2016) architecture (14 nm), while the Core i5-10400F uses Comet Lake (2020−2025) (14 nm). In PassMark, the Core i7-6900K scores 14,682 against the Core i5-10400F's 13,029 — a 11.9% lead for the Core i7-6900K. Geekbench 6 single-core — the metric most relevant to gaming — records 1,273 vs 1,454, a 13.3% lead for the Core i5-10400F that directly translates to higher frame rates. Multi-core Geekbench: 7,591 vs 5,783 (27% advantage for the Core i7-6900K). L3 cache: 20 MB (total) on the Core i7-6900K vs 12 MB (total) on the Core i5-10400F.
| Feature | Core i7-6900K | Core i5-10400F |
|---|---|---|
| Cores / Threads | 8 / 16+33% | 6 / 12 |
| Boost Clock | 4 GHz | 4.3 GHz+7% |
| Base Clock | 3.2 GHz+10% | 2.9 GHz |
| L3 Cache | 20 MB (total)+67% | 12 MB (total) |
| L2 Cache | 256 kB (per core) | 256K (per core) |
| Process | 14 nm | 14 nm |
| Architecture | Broadwell-E (2016) | Comet Lake (2020−2025) |
| PassMark | 14,682+13% | 13,029 |
| Cinebench R23 Multi | — | 8,191 |
| Geekbench 6 Single | 1,273 | 1,454+14% |
| Geekbench 6 Multi | 7,591+31% | 5,783 |
Memory & Platform
The Core i7-6900K uses the LGA2011 socket (PCIe 3.0), while the Core i5-10400F uses LGA1200 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2400 memory speed. Both support up to 128 GB of RAM. Memory channels: 4 (Core i7-6900K) vs 2 (Core i5-10400F). PCIe lanes: 40 (Core i7-6900K) vs 16 (Core i5-10400F) — the Core i7-6900K offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: X99 (Core i7-6900K) and H410,B460,H470,Z490,H510,B560,H570,Z590 (Core i5-10400F).
| Feature | Core i7-6900K | Core i5-10400F |
|---|---|---|
| Socket | LGA2011 | LGA1200 |
| PCIe Generation | PCIe 3.0 | PCIe 3.0 |
| Max RAM Speed | DDR4-2400 | DDR4-2666 |
| Max RAM Capacity | 128 GB | 128 GB |
| RAM Channels | 4+100% | 2 |
| ECC Support | ❌ | ❌ |
| PCIe Lanes | 40+150% | 16 |
Advanced Features
Only the Core i7-6900K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support VT-x, VT-d virtualization. Primary use case: Core i7-6900K targets High-End Desktop, Core i5-10400F targets Gaming. Direct competitor: Core i5-10400F rivals Ryzen 5 3600.
| Feature | Core i7-6900K | Core i5-10400F |
|---|---|---|
| Integrated GPU | No | No |
| IGPU Model | None | — |
| Unlocked | Yes | No |
| AVX-512 | No | No |
| Virtualization | VT-x, VT-d | VT-x, VT-d |
| Target Use | High-End Desktop | Gaming |
Value Analysis
The Core i7-6900K launched at $1089 MSRP, while the Core i5-10400F debuted at $160. At current prices ($1089 vs $102), the Core i5-10400F is $987 cheaper. In terms of value (PassMark points per dollar), the Core i7-6900K delivers 13.5 pts/$ vs 127.7 pts/$ for the Core i5-10400F — making the Core i5-10400F the 161.8% better value option.
| Feature | Core i7-6900K | Core i5-10400F |
|---|---|---|
| MSRP | $1089 | $160-85% |
| Avg Price (30d) | $1089 | $102-91% |
| Performance per Dollar | 13.5 | 127.7+846% |
| Release Date | 2016 | 2020 |
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