CPU
GPU
A4 Micro-6400T
Core i7-620UM
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. The A4 Micro-6400T is positioned at rank 843 and the Core i7-620UM is on rank 1228, so the A4 Micro-6400T offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar A4 Micro-6400T
Performance Per Dollar Core i7-620UM
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | A4 Micro-6400T | Core i7-620UM |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($278) |
| Longevity | 🛑 Legacy (Mullins (2014) / 28 nm) | 🛑 Legacy (Arrandale (2010−2011) / 32 nm) |
💎 Value Proposition
| Insight | A4 Micro-6400T | Core i7-620UM |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($278) |
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 A4 Micro-6400T and Core i7-620UM
A4 Micro-6400T
The A4 Micro-6400T is manufactured by AMD. It was released in 29 April 2014 (11 years ago). It is based on the Mullins (2014) architecture. It features 4 cores and 4 threads. Base frequency is 1 GHz, with boost up to 1.6 GHz. L2 cache: 2048 kB. Built on 28 nm process technology. Socket: FT3. Thermal design power (TDP): 5 Watt. Memory support: DDR3-1333. Passmark benchmark score: 1,082 points. Launch price was $69.
Core i7-620UM
The Core i7-620UM is manufactured by Intel. It was released in 7 January 2010 (15 years ago). It is based on the Arrandale (2010−2011) architecture. It features 2 cores and 4 threads. Base frequency is 1.06 GHz, with boost up to 2.13 GHz. L3 cache: 4 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: BGA1288. Thermal design power (TDP): 18 Watt. Memory support: DDR3-800. Passmark benchmark score: 1,091 points. Launch price was $278.
Processing Power
The A4 Micro-6400T packs 4 cores / 4 threads, while the Core i7-620UM offers 2 cores / 4 threads — the A4 Micro-6400T has 2 more cores. Boost clocks reach 1.6 GHz on the A4 Micro-6400T versus 2.13 GHz on the Core i7-620UM — a 28.4% clock advantage for the Core i7-620UM (base: 1 GHz vs 1.06 GHz). The A4 Micro-6400T uses the Mullins (2014) architecture (28 nm), while the Core i7-620UM uses Arrandale (2010−2011) (32 nm). In PassMark, the A4 Micro-6400T scores 1,082 against the Core i7-620UM's 1,091 — a 0.8% lead for the Core i7-620UM. Geekbench 6 single-core — the metric most relevant to gaming — records 180 vs 350, a 64.2% lead for the Core i7-620UM that directly translates to higher frame rates.
| Feature | A4 Micro-6400T | Core i7-620UM |
|---|---|---|
| Cores / Threads | 4 / 4+100% | 2 / 4 |
| Boost Clock | 1.6 GHz | 2.13 GHz+33% |
| Base Clock | 1 GHz | 1.06 GHz+6% |
| L3 Cache | — | 4 MB (total) |
| L2 Cache | 2048 kB+700% | 256 kB (per core) |
| Process | 28 nm-13% | 32 nm |
| Architecture | Mullins (2014) | Arrandale (2010−2011) |
| PassMark | 1,082 | 1,091 |
| Geekbench 6 Single | 180 | 350+94% |
| Geekbench 6 Multi | — | 700 |
Memory & Platform
The A4 Micro-6400T uses the FT3 socket (PCIe 3.0), while the Core i7-620UM uses BGA1288 (PCIe 2.0) — making them incompatible on the same motherboard. Both support up to DDR3L-1333 memory speed. Both support up to 8 GB of RAM. Memory channels: 1 (A4 Micro-6400T) vs 2 (Core i7-620UM). PCIe lanes: 8 (A4 Micro-6400T) vs 16 (Core i7-620UM) — the Core i7-620UM offers 8 more lanes for additional GPUs or NVMe drives.
| Feature | A4 Micro-6400T | Core i7-620UM |
|---|---|---|
| Socket | FT3 | BGA1288 |
| PCIe Generation | PCIe 3.0+50% | PCIe 2.0 |
| Max RAM Speed | DDR3L-1333 | DDR3-1066 |
| Max RAM Capacity | 8 GB | 8 GB |
| RAM Channels | 1 | 2+100% |
| ECC Support | ❌ | ❌ |
| PCIe Lanes | 8 | 16+100% |
Advanced Features
Neither processor supports overclocking. Virtualization support: AMD-V (A4 Micro-6400T) vs VT-x (Core i7-620UM). Both include integrated graphics — Radeon R3 (A4 Micro-6400T) and Intel HD Graphics (Ironlake) (Core i7-620UM) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: A4 Micro-6400T targets Tablet, Core i7-620UM targets Ultra-Portable Laptop. Direct competitor: A4 Micro-6400T rivals Atom Z3770; Core i7-620UM rivals Core 2 Duo SU9600.
| Feature | A4 Micro-6400T | Core i7-620UM |
|---|---|---|
| Integrated GPU | Yes | Yes |
| IGPU Model | Radeon R3 | Intel HD Graphics (Ironlake) |
| Unlocked | No | No |
| AVX-512 | No | No |
| Virtualization | AMD-V | VT-x |
| Target Use | Tablet | Ultra-Portable Laptop |
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The most powerful cpus ranked by PassMark CPU Mark benchmark scores.
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