Kioxia’s BG6 512 GB SSD targets budget users with PCIe Gen 4 support, but benchmark results show it falls short of its advertised speeds.
Overview: Budget PCIe 4.0 in M.2 Form
The Kioxia BG6 KBG6AZNV512G is a 512 GB M.2 2280 NVMe SSD, unveiled in May 2023 as part of the BG6 series. While a smaller M.2 2230 variant is also available, this 2280 model offers PCIe 4.0 x4 interface speeds at a lower price, making it an appealing option for thin laptops and budget PC builds.
The drive is rated for 4.8 GB/s sequential reads and 4.0 GB/s writes by Kioxia. However, real-world benchmarks tell a different story.
Claimed vs. Actual Performance
In Kioxia’s specs, the drive looks competitive for entry-level PCIe 4.0:
- Advertised Sequential Read: 4.8 GB/s
- Advertised Sequential Write: 4.0 GB/s
- Power Consumption: ~4.7 W under load
But in independent testing (AS SSD & DiskSpd), the performance is more modest:
| Metric | Claimed | AS SSD / DiskSpd Result |
|---|---|---|
| Sequential Read | 4.8 GB/s | 3.69 GB/s (AS SSD), 4.06 GB/s (DiskSpd) |
| Sequential Write | 4.0 GB/s | 2.36 GB/s (AS SSD), 1.75 GB/s (DiskSpd Q8T1) |
| Access Times (Read/Write) | – | 0.1 ms / 0.1 ms |
| 4K Read (AS SSD) | – | 40.7 MB/s |
| 4K Write (AS SSD) | – | 161 MB/s |
| AS SSD Total Score | – | 2464 Points (≈15th percentile) |
In some workloads (like ISO or Game copy), it achieves mid-range transfer speeds, but lacks consistency across synthetic tests.
Strengths
- Affordable PCIe 4.0 option for budget systems
- Low-profile M.2 2280 form factor, also available in compact 2230
- Acceptable performance in basic desktop and laptop workloads
- Lower power consumption than some high-performance SSDs
Weaknesses
- Fails to meet advertised speeds in most benchmarks
- Low percentile scores in write-heavy tasks and 4K QD32 workloads
- Mediocre performance scaling compared to Gen 4 competitors
- Not ideal for high-end gaming, 4K editing, or workstation tasks
Use Case Verdict
The Kioxia BG6 512 GB is best suited for:
- Basic productivity setups (web, office, media)
- Thin-and-light laptops needing a budget SSD upgrade
- Secondary storage for large file storage or OS installs
It’s not ideal for performance-critical tasks like 4K video editing, large-scale gaming, or multi-threaded disk operations, especially given the subpar 4K and queue-depth performance.
