Core i9-9900KF vs Core i7-9800X
Core i9-9900KF
Core i7-9800X
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 i9-9900KF
Performance Per Dollar Core i7-9800X
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i9-9900KF | Core i7-9800X |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($350) | ✅ More affordable ($210) |
| Longevity | ✨ Modern (Coffee Lake-R (2018−2019) / 14 nm) | ✨ Modern (Skylake (server) (2017−2018) / 14 nm) |
💎 Value Proposition
| Insight | Core i9-9900KF | Core i7-9800X |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+68%) |
| Upfront Cost | ⚠️ Higher cost ($350) | ✅ More affordable ($210) |
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 i9-9900KF and Core i7-9800X
Core i9-9900KF
The Core i9-9900KF is manufactured by Intel. It was released in 8 January 2019 (6 years ago). It is based on the Coffee Lake-R (2018−2019) architecture. It features 8 cores and 16 threads. Base frequency is 3.6 GHz, with boost up to 5 GHz. L3 cache: 16 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 95 Watt. Memory support: DDR4-2666. Passmark benchmark score: 18,029 points. Launch price was $488.
Core i7-9800X
The Core i7-9800X is manufactured by Intel. It was released in 19 October 2018 (7 years ago). It is based on the Skylake (server) (2017−2018) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.5 GHz. L3 cache: 16.5 MB (total). L2 cache: 1 MB (per core). Built on 14 nm process technology. Socket: LGA2066. Thermal design power (TDP): 165 Watt. Memory support: DDR4-2666. Passmark benchmark score: 18,128 points. Launch price was $589.
Processing Power
Both the Core i9-9900KF and Core i7-9800X share an identical 8-core/16-thread configuration. Boost clocks reach 5 GHz on the Core i9-9900KF versus 4.5 GHz on the Core i7-9800X — a 10.5% clock advantage for the Core i9-9900KF (base: 3.6 GHz vs 3.8 GHz). The Core i9-9900KF uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the Core i7-9800X uses Skylake (server) (2017−2018) (14 nm). In PassMark, the Core i9-9900KF scores 18,029 against the Core i7-9800X's 18,128 — a 0.5% lead for the Core i7-9800X. Cinebench R23 multi-core: 12,812 vs 13,067 (2% advantage for the Core i7-9800X). Geekbench 6 single-core — the metric most relevant to gaming — records 1,720 vs 1,372, a 22.5% lead for the Core i9-9900KF that directly translates to higher frame rates. Multi-core Geekbench: 8,150 vs 7,552 (7.6% advantage for the Core i9-9900KF). L3 cache: 16 MB (total) on the Core i9-9900KF vs 16.5 MB (total) on the Core i7-9800X.
| Feature | Core i9-9900KF | Core i7-9800X |
|---|---|---|
| Cores / Threads | 8 / 16 | 8 / 16 |
| Boost Clock | 5 GHz+11% | 4.5 GHz |
| Base Clock | 3.6 GHz | 3.8 GHz+6% |
| L3 Cache | 16 MB (total) | 16.5 MB (total)+3% |
| L2 Cache | 256K (per core) | 1 MB (per core)+300% |
| Process | 14 nm | 14 nm |
| Architecture | Coffee Lake-R (2018−2019) | Skylake (server) (2017−2018) |
| PassMark | 18,029 | 18,128 |
| Cinebench R23 Multi | 12,812 | 13,067+2% |
| Geekbench 6 Single | 1,720+25% | 1,372 |
| Geekbench 6 Multi | 8,150+8% | 7,552 |
Memory & Platform
The Core i9-9900KF uses the LGA1151 socket (PCIe 3.0), while the Core i7-9800X uses LGA2066 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2666 memory speed. Both support up to 128 GB of RAM. Memory channels: 2 (Core i9-9900KF) vs 4 (Core i7-9800X). PCIe lanes: 16 (Core i9-9900KF) vs 44 (Core i7-9800X) — the Core i7-9800X offers 28 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Z390,Z370,H370,B365,B360 (Core i9-9900KF) and X299 (Core i7-9800X).
| Feature | Core i9-9900KF | Core i7-9800X |
|---|---|---|
| Socket | LGA1151 | LGA2066 |
| PCIe Generation | PCIe 3.0 | PCIe 3.0 |
| Max RAM Speed | DDR4-2666 | DDR4-2666 |
| Max RAM Capacity | 128 GB | 128 GB |
| RAM Channels | 2 | 4+100% |
| ECC Support | ❌ | ❌ |
| PCIe Lanes | 16 | 44+175% |
Advanced Features
Both processors feature an unlocked multiplier for overclocking. Only the Core i7-9800X supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d virtualization. Primary use case: Core i9-9900KF targets Gaming, Core i7-9800X targets Workstation. Direct competitor: Core i7-9800X rivals Ryzen 5 3600XT.
| Feature | Core i9-9900KF | Core i7-9800X |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | Yes | Yes |
| AVX-512 | No | Yes |
| Virtualization | VT-x, VT-d | VT-x, VT-d |
| Target Use | Gaming | Workstation |
Value Analysis
The Core i9-9900KF launched at $488 MSRP, while the Core i7-9800X debuted at $589. At current prices ($350 vs $210), the Core i7-9800X is $140 cheaper. In terms of value (PassMark points per dollar), the Core i9-9900KF delivers 51.5 pts/$ vs 86.3 pts/$ for the Core i7-9800X — making the Core i7-9800X the 50.5% better value option.
| Feature | Core i9-9900KF | Core i7-9800X |
|---|---|---|
| MSRP | $488-17% | $589 |
| Avg Price (30d) | $350 | $210-40% |
| Performance per Dollar | 51.5 | 86.3+68% |
| Release Date | 2019 | 2018 |
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