CPU
GPU
Core i7-5820K
Core i5-10400T
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. The Core i7-5820K is positioned at rank #686 in our cost-efficiency ranking, representing a Lower cost-benefit for your build. 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 i7-5820K
Performance Per Dollar Core i5-10400T
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i7-5820K | Core i5-10400T |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($103) | ✅ More affordable ($100) |
| Longevity | 🛑 Legacy (Haswell-E (2014) / 22 nm) | ✨ Modern (Legacy / 14 nm) |
💎 Value Proposition
| Insight | Core i7-5820K | Core i5-10400T |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+3%) |
| Upfront Cost | ⚠️ Higher cost ($103) | ✅ More affordable ($100) |
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 i7-5820K and Core i5-10400T
Core i7-5820K
The Core i7-5820K is manufactured by Intel. It was released in 1 September 2014 (11 years ago). It is based on the Haswell-E (2014) architecture. It features 6 cores and 12 threads. Base frequency is 3.3 GHz, with boost up to 3.6 GHz. L3 cache: 15 MB (total). L2 cache: 256 kB (per core). Built on 22 nm process technology. Socket: LGA2011. Thermal design power (TDP): 140 Watt. Memory support: DDR4. Passmark benchmark score: 9,826 points. Launch price was $410.
Core i5-10400T
The Core i5-10400T is manufactured by Intel. It was released in 1 April 2020 (5 years ago). It features 6 cores and 12 threads. Base frequency is 2 GHz, with boost up to 3.6 GHz. L3 cache: 12 MB Intel® Smart Cache. Built on 14 nm process technology. Socket: LGA1200. Thermal design power (TDP): 35 Watt. Memory support: DDR4-2666. Passmark benchmark score: 9,789 points. Launch price was $149.
Processing Power
Both the Core i7-5820K and Core i5-10400T share an identical 6-core/12-thread configuration. Boost clocks reach 3.6 GHz on the Core i7-5820K versus 3.6 GHz on the Core i5-10400T — identical boost frequencies (base: 3.3 GHz vs 2 GHz). The Core i7-5820K is built on the Haswell-E (2014) architecture. In PassMark, the Core i7-5820K scores 9,826 against the Core i5-10400T's 9,789 — a 0.4% lead for the Core i7-5820K. Geekbench 6 single-core — the metric most relevant to gaming — records 1,134 vs 1,272, a 11.5% lead for the Core i5-10400T that directly translates to higher frame rates. L3 cache: 15 MB (total) on the Core i7-5820K vs 12 MB Intel® Smart Cache on the Core i5-10400T.
| Feature | Core i7-5820K | Core i5-10400T |
|---|---|---|
| Cores / Threads | 6 / 12 | 6 / 12 |
| Boost Clock | 3.6 GHz | 3.6 GHz |
| Base Clock | 3.3 GHz+65% | 2 GHz |
| L3 Cache | 15 MB (total)+25% | 12 MB Intel® Smart Cache |
| L2 Cache | 256 kB (per core) | — |
| Process | 22 nm | 14 nm-36% |
| Architecture | Haswell-E (2014) | — |
| PassMark | 9,826 | 9,789 |
| Cinebench R23 Multi | 5,700 | — |
| Geekbench 6 Single | 1,134 | 1,272+12% |
| Geekbench 6 Multi | 5,383 | — |
Memory & Platform
The Core i7-5820K uses the LGA2011 socket (PCIe 3.0), while the Core i5-10400T uses LGA1200 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2133 memory speed. The Core i5-10400T supports up to 128 GB of RAM compared to 64 GB — 66.7% more capacity for professional workloads. Memory channels: 4 (Core i7-5820K) vs 2 (Core i5-10400T). PCIe lanes: 28 (Core i7-5820K) vs 16 (Core i5-10400T) — the Core i7-5820K offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel X99 (Core i7-5820K) and H410,B460,H470,Z490,H510,B560,H570,Z590 (Core i5-10400T).
| Feature | Core i7-5820K | Core i5-10400T |
|---|---|---|
| Socket | LGA2011 | LGA1200 |
| PCIe Generation | PCIe 3.0 | PCIe 3.0 |
| Max RAM Speed | DDR4-2133 | DDR4-2666 |
| Max RAM Capacity | 64 GB | 128 GB+100% |
| RAM Channels | 4+100% | 2 |
| ECC Support | ❌ | ❌ |
| PCIe Lanes | 28+75% | 16 |
Advanced Features
Only the Core i7-5820K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: Yes (Core i7-5820K) vs VT-x, VT-d, EPT (Core i5-10400T). The Core i5-10400T includes integrated graphics (UHD Graphics 630), while the Core i7-5820K requires a dedicated GPU. Primary use case: Core i7-5820K targets Enthusiast Workstation, Core i5-10400T targets Low Power Desktop. Direct competitor: Core i7-5820K rivals Ryzen 5 1600; Core i5-10400T rivals Ryzen 5 3400GE.
| Feature | Core i7-5820K | Core i5-10400T |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | — | UHD Graphics 630 |
| Unlocked | Yes | No |
| AVX-512 | No | No |
| Virtualization | Yes | VT-x, VT-d, EPT |
| Target Use | Enthusiast Workstation | Low Power Desktop |
Value Analysis
The Core i7-5820K launched at $389 MSRP, while the Core i5-10400T debuted at $182. At current prices ($103 vs $100), the Core i5-10400T is $3 cheaper. In terms of value (PassMark points per dollar), the Core i7-5820K delivers 95.4 pts/$ vs 97.9 pts/$ for the Core i5-10400T — making the Core i5-10400T the 2.6% better value option.
| Feature | Core i7-5820K | Core i5-10400T |
|---|---|---|
| MSRP | $389 | $182-53% |
| Avg Price (30d) | $103 | $100-3% |
| Performance per Dollar | 95.4 | 97.9+3% |
| Release Date | 2014 | 2020 |
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