Core i9-9900K vs Xeon Gold 5120
Core i9-9900K
Xeon Gold 5120
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 i9-9900K
Performance Per Dollar Xeon Gold 5120
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Core i9-9900K | Xeon Gold 5120 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($331) | ✅ More affordable ($0) |
| Longevity | ✨ Modern (Coffee Lake-R (2018−2019) / 14 nm) | ✨ Modern (Skylake (server) (2017−2018) / 14 nm) |
💎 Value Proposition
| Insight | Core i9-9900K | Xeon Gold 5120 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($331) | ✅ More affordable ($0) |
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 i9-9900K and Xeon Gold 5120
Core i9-9900K
The Core i9-9900K is manufactured by Intel. It was released in 19 October 2018 (7 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. Passmark benchmark score: 18,109 points. Launch price was $488.
Xeon Gold 5120
The Xeon Gold 5120 is manufactured by Intel. It was released in 11 July 2017 (8 years ago). It is based on the Skylake (server) (2017−2018) architecture. It features 14 cores and 28 threads. Base frequency is 2.2 GHz, with boost up to 3.2 GHz. L3 cache: 19.25 MB. L2 cache: 14 MB. Built on 14 nm process technology. Socket: LGA3647. Thermal design power (TDP): 105 Watt. Memory support: DDR4-2400. Passmark benchmark score: 18,132 points. Launch price was $1,555.
Processing Power
The Core i9-9900K packs 8 cores / 16 threads, while the Xeon Gold 5120 offers 14 cores / 28 threads — the Xeon Gold 5120 has 6 more cores. Boost clocks reach 5 GHz on the Core i9-9900K versus 3.2 GHz on the Xeon Gold 5120 — a 43.9% clock advantage for the Core i9-9900K (base: 3.6 GHz vs 2.2 GHz). The Core i9-9900K uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the Xeon Gold 5120 uses Skylake (server) (2017−2018) (14 nm). In PassMark, the Core i9-9900K scores 18,109 against the Xeon Gold 5120's 18,132 — a 0.1% lead for the Xeon Gold 5120. L3 cache: 16 MB (total) on the Core i9-9900K vs 19.25 MB on the Xeon Gold 5120.
| Feature | Core i9-9900K | Xeon Gold 5120 |
|---|---|---|
| Cores / Threads | 8 / 16 | 14 / 28+75% |
| Boost Clock | 5 GHz+56% | 3.2 GHz |
| Base Clock | 3.6 GHz+64% | 2.2 GHz |
| L3 Cache | 16 MB (total) | 19.25 MB+20% |
| L2 Cache | 256K (per core) | 14 MB+5500% |
| Process | 14 nm | 14 nm |
| Architecture | Coffee Lake-R (2018−2019) | Skylake (server) (2017−2018) |
| PassMark | 18,109 | 18,132 |
Memory & Platform
The Core i9-9900K uses the LGA1151 socket (PCIe 3.0), while the Xeon Gold 5120 uses LGA3647 (PCIe 3.0) — making them incompatible on the same motherboard.
| Feature | Core i9-9900K | Xeon Gold 5120 |
|---|---|---|
| Socket | LGA1151 | LGA3647 |
| PCIe Generation | PCIe 3.0 | PCIe 3.0 |
| Max RAM Speed | DDR4-2666 | — |
| Max RAM Capacity | 128 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 16 | — |
Advanced Features
The Core i9-9900K includes integrated graphics (Intel UHD Graphics 630), while the Xeon Gold 5120 requires a dedicated GPU.
| Feature | Core i9-9900K | Xeon Gold 5120 |
|---|---|---|
| Integrated GPU | Yes | — |
| IGPU Model | Intel UHD Graphics 630 | — |
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