A8-3870K vs Ryzen 9 5900X
A8-3870K
Ryzen 9 5900X
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 A8-3870K is positioned at rank #502 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 A8-3870K
Performance Per Dollar Ryzen 9 5900X
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | A8-3870K | Ryzen 9 5900X |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($350) |
| Longevity | 🛑 Legacy (Llano (2011−2012) / 32 nm) | ✨ Modern (Vermeer (Zen3) (2020−2022) / 7 nm, 12 nm) |
💎 Value Proposition
| Insight | A8-3870K | Ryzen 9 5900X |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($350) |
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 A8-3870K and Ryzen 9 5900X
A8-3870K
The A8-3870K is manufactured by AMD. It was released in 2014-01-01. It is based on the Llano (2011−2012) architecture. It features 4 cores and 4 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 0 kB. L2 cache: 1 MB (per core). Built on 32 nm process technology. Socket: FM1. Thermal design power (TDP): 100 Watt. Memory support: DDR3. Passmark benchmark score: 2,360 points. Launch price was $90.
Ryzen 9 5900X
The Ryzen 9 5900X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen3) (2020−2022) architecture. It features 12 cores and 24 threads. Base frequency is 3.7 GHz, with boost up to 4.8 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4-3200. Passmark benchmark score: 38,955 points. Launch price was $549.
Processing Power
The A8-3870K packs 4 cores / 4 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 8 more cores. Boost clocks reach 3 GHz on the A8-3870K versus 4.8 GHz on the Ryzen 9 5900X — a 46.2% clock advantage for the Ryzen 9 5900X (base: 3 GHz vs 3.7 GHz). The A8-3870K uses the Llano (2011−2012) architecture (32 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the A8-3870K scores 2,360 against the Ryzen 9 5900X's 38,955 — a 177.2% lead for the Ryzen 9 5900X. Geekbench 6 single-core — the metric most relevant to gaming — records 380 vs 2,174, a 140.5% lead for the Ryzen 9 5900X that directly translates to higher frame rates. L3 cache: 0 kB on the A8-3870K vs 64 MB on the Ryzen 9 5900X.
| Feature | A8-3870K | Ryzen 9 5900X |
|---|---|---|
| Cores / Threads | 4 / 4 | 12 / 24+200% |
| Boost Clock | 3 GHz | 4.8 GHz+60% |
| Base Clock | 3 GHz | 3.7 GHz+23% |
| L3 Cache | 0 kB | 64 MB |
| L2 Cache | 1 MB (per core)+100% | 512K (per core) |
| Process | 32 nm | 7 nm, 12 nm-78% |
| Architecture | Llano (2011−2012) | Vermeer (Zen3) (2020−2022) |
| PassMark | 2,360 | 38,955+1551% |
| Cinebench R23 Multi | — | 21,000 |
| Geekbench 6 Single | 380 | 2,174+472% |
| Geekbench 6 Multi | — | 11,888 |
Memory & Platform
The A8-3870K uses the FM1 socket (PCIe 2.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1866 on the A8-3870K versus DDR4-3200 on the Ryzen 9 5900X — the Ryzen 9 5900X supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 9 5900X supports up to 128 GB of RAM compared to 32 GB — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (A8-3870K) vs 24 (Ryzen 9 5900X) — the Ryzen 9 5900X offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: A55,A75 (A8-3870K) and A320,B350,X370,B450,X470,B550,X570 (Ryzen 9 5900X).
| Feature | A8-3870K | Ryzen 9 5900X |
|---|---|---|
| Socket | FM1 | AM4 |
| PCIe Generation | PCIe 2.0 | PCIe 4.0+100% |
| Max RAM Speed | DDR3-1866 | DDR4-3200+33% |
| Max RAM Capacity | 32 GB | 128 GB+300% |
| RAM Channels | 2 | 2 |
| ECC Support | ❌ | ✅ |
| PCIe Lanes | 20 | 24+20% |
Advanced Features
Both processors feature an unlocked multiplier for overclocking. Both support AMD-V virtualization. The A8-3870K includes integrated graphics (Radeon HD 6550D), while the Ryzen 9 5900X requires a dedicated GPU. Primary use case: A8-3870K targets Budget Gaming Desktop, Ryzen 9 5900X targets Workstation. Direct competitor: A8-3870K rivals Core i3-2125; Ryzen 9 5900X rivals Core i9-12900K.
| Feature | A8-3870K | Ryzen 9 5900X |
|---|---|---|
| Integrated GPU | Yes | No |
| IGPU Model | Radeon HD 6550D | — |
| Unlocked | Yes | Yes |
| AVX-512 | No | No |
| Virtualization | AMD-V | AMD-V |
| Target Use | Budget Gaming Desktop | Workstation |
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