Core i5-8400T vs Core i7-12700K
Core i5-8400T
Core i7-12700K
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 i5-8400T
Performance Per Dollar Core i7-12700K
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i5-8400T | Core i7-12700K |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($179) | ⚠️ Higher cost ($285) |
| Longevity | ✨ Modern (Coffee Lake (2017−2019) / 14 nm) | ✨ Modern (Alder Lake, Golden Cove, Gracemont (2021) / 10 nm) |
💎 Value Proposition
| Insight | Core i5-8400T | Core i7-12700K |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+190%) |
| Upfront Cost | ✅ More affordable ($179) | ⚠️ Higher cost ($285) |
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 i5-8400T and Core i7-12700K
Core i5-8400T
The Core i5-8400T is manufactured by Intel. It was released in 2 April 2018 (7 years ago). It is based on the Coffee Lake (2017−2019) architecture. It features 6 cores and 6 threads. Base frequency is 1.7 GHz, with boost up to 3.3 GHz. L3 cache: 9 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 35 Watt. Memory support: DDR4-2666. Passmark benchmark score: 7,426 points. Launch price was $182.
Core i7-12700K
The Core i7-12700K is manufactured by Intel. It was released in 4 November 2021 (4 years ago). It is based on the Alder Lake, Golden Cove, Gracemont (2021) architecture. It features 12 cores and 20 threads. Base frequency is 3.6 GHz, with boost up to 5 GHz. L3 cache: 25 MB (total). L2 cache: 1.25 MB (per core). Built on 10 nm process technology. Socket: LGA1700. Thermal design power (TDP): 125 Watt. Memory support: DDR4, DDR5. Passmark benchmark score: 34,347 points. Launch price was $409.
Processing Power
The Core i5-8400T packs 6 cores / 6 threads, while the Core i7-12700K offers 12 cores / 20 threads — the Core i7-12700K has 6 more cores. Boost clocks reach 3.3 GHz on the Core i5-8400T versus 5 GHz on the Core i7-12700K — a 41% clock advantage for the Core i7-12700K (base: 1.7 GHz vs 3.6 GHz). The Core i5-8400T uses the Coffee Lake (2017−2019) architecture (14 nm), while the Core i7-12700K uses Alder Lake, Golden Cove, Gracemont (2021) (10 nm). In PassMark, the Core i5-8400T scores 7,426 against the Core i7-12700K's 34,347 — a 128.9% lead for the Core i7-12700K. L3 cache: 9 MB (total) on the Core i5-8400T vs 25 MB (total) on the Core i7-12700K.
| Feature | Core i5-8400T | Core i7-12700K |
|---|---|---|
| Cores / Threads | 6 / 6 | 12 / 20+100% |
| Boost Clock | 3.3 GHz | 5 GHz+52% |
| Base Clock | 1.7 GHz | 3.6 GHz+112% |
| L3 Cache | 9 MB (total) | 25 MB (total)+178% |
| L2 Cache | 256K (per core) | 1.25 MB (per core)+400% |
| Process | 14 nm | 10 nm-29% |
| Architecture | Coffee Lake (2017−2019) | Alder Lake, Golden Cove, Gracemont (2021) |
| PassMark | 7,426 | 34,347+363% |
| Cinebench R23 Multi | 3,737 | — |
| Geekbench 6 Single | 1,092 | — |
| Geekbench 6 Multi | 3,816 | — |
Memory & Platform
The Core i5-8400T uses the LGA1151 socket (PCIe 3.0), while the Core i7-12700K uses LGA1700 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i5-8400T versus 4800 on the Core i7-12700K — the Core i7-12700K supports 199.7% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 128 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i5-8400T) vs 20 (Core i7-12700K) — the Core i7-12700K offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: H310,B360,H370,Q370,Z370,Z390 (Core i5-8400T) and Z690,B660 (Core i7-12700K).
| Feature | Core i5-8400T | Core i7-12700K |
|---|---|---|
| Socket | LGA1151 | LGA1700 |
| PCIe Generation | PCIe 3.0 | PCIe 5.0+67% |
| Max RAM Speed | DDR4-2666 | 4800+119900% |
| Max RAM Capacity | 128 GB+104857500% | 128 |
| RAM Channels | 2 | 2 |
| ECC Support | ❌ | ✅ |
| PCIe Lanes | 16 | 20+25% |
Advanced Features
Virtualization support: Yes (Core i5-8400T) vs VT-x, VT-d (Core i7-12700K). Both include integrated graphics — UHD Graphics 630 (Core i5-8400T) and Intel UHD Graphics 770 (Core i7-12700K) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Direct competitor: Core i7-12700K rivals Ryzen 7 5800X.
| Feature | Core i5-8400T | Core i7-12700K |
|---|---|---|
| Integrated GPU | Yes | Yes |
| IGPU Model | UHD Graphics 630 | Intel UHD Graphics 770 |
| Unlocked | — | Yes |
| AVX-512 | No | No |
| Virtualization | Yes | VT-x, VT-d |
Value Analysis
The Core i5-8400T launched at $182 MSRP, while the Core i7-12700K debuted at $409. At current prices ($179 vs $285), the Core i5-8400T is $106 cheaper. In terms of value (PassMark points per dollar), the Core i5-8400T delivers 41.5 pts/$ vs 120.5 pts/$ for the Core i7-12700K — making the Core i7-12700K the 97.6% better value option.
| Feature | Core i5-8400T | Core i7-12700K |
|---|---|---|
| MSRP | $182-56% | $409 |
| Avg Price (30d) | $179-37% | $285 |
| Performance per Dollar | 41.5 | 120.5+190% |
| Release Date | 2018 | 2021 |
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