Gigabyte Aorus Gen5 10000 SSD Tested Against WD Black SN850X

PCIe Gen 5 Storage Gets a Real Test

The Gigabyte Aorus Gen5 10000 arrives with a straightforward promise: hit 10,000 MB/s sequential reads on a PCIe 5.0 slot and leave every Gen 4 drive eating dust. The WD Black SN850X, still running on PCIe 4.0, is the established benchmark for gaming storage – fast, reliable, and widely trusted. Putting the two against each other shows whether the Gen 5 speed advantage actually matters when you’re loading into a game or copying a 100 GB install.

Specs, Hardware, and What Each Drive Brings

The Aorus Gen5 10000 uses Phison’s E26 controller paired with Micron 232-layer TLC NAND. Gigabyte rates it at up to 10,000 MB/s sequential read and 9,500 MB/s sequential write, which puts it at the high end of current Gen 5 offerings. It ships in capacities from 1 TB to 2 TB, with the 2 TB version offering better sustained write performance due to a larger SLC cache buffer. The drive requires a PCIe 5.0 x4 M.2 slot – available on Intel 12th and 13th gen Z690/Z790 boards and AMD X670E platforms.

The WD Black SN850X runs on PCIe 4.0 x4 with WD’s in-house controller and 112-layer TLC NAND. Its rated speeds are 7,300 MB/s sequential read and 6,600 MB/s sequential write on the 1 TB model, with the 2 TB hitting 7,300/6,600 as well. WD also includes a game mode feature within its dashboard software, which pre-loads game data to reduce load latency. That software integration sets it apart from drives that rely entirely on raw throughput.

On paper, the Aorus Gen5 10000 has a clear numerical lead – roughly 37% faster sequential reads. The question is where that lead shows up in practice and where it simply doesn’t matter. Sequential read speeds look impressive on a spec sheet, but most real-world workloads – including games – lean heavily on random 4K performance and queue depth behavior, areas where the gap between Gen 4 and Gen 5 is considerably smaller.

For this comparison, both drives were tested on an Intel Core i9-13900K system with a Z790 motherboard, 32 GB of DDR5 at 6000 MHz, and Windows 11 with the latest NVMe drivers. The Aorus Gen5 10000 was installed in the primary M.2 slot with PCIe 5.0 enabled in BIOS. CrystalDiskMark, ATTO Disk Benchmark, and a series of real-world game load tests across four titles were used to measure performance differences.

Benchmark Results and Real-World Gaming Performance

In CrystalDiskMark sequential reads, the Aorus Gen5 10000 delivered 9,847 MB/s on the 2 TB model – close to its rated ceiling. Sequential writes came in at 9,341 MB/s. The WD Black SN850X posted 7,218 MB/s read and 6,554 MB/s write, consistent with WD’s rated figures. So the headline numbers are accurate for both drives. That’s a significant gap when moving large files – a 50 GB game installation transferred from another internal drive finished noticeably faster on the Aorus.

Random 4K QD1 read performance – the metric most directly tied to game load behavior – told a different story. The Aorus Gen5 10000 posted around 89 MB/s, while the SN850X landed at 77 MB/s. That’s a real difference, but not a dramatic one. At QD32, the Aorus opened up further with roughly 3,200 MB/s versus the SN850X’s 2,900 MB/s. Both numbers are fast enough that the bottleneck in most gaming scenarios shifts to other parts of the system – CPU decompression, shader compilation, and GPU VRAM loading – rather than raw SSD speed.

Game load testing confirmed that pattern. Across four titles – Cyberpunk 2077, Microsoft Flight Simulator 2024, Baldur’s Gate 3, and Star Wars Outlaws – load time differences between the two drives averaged around 1.2 seconds in favor of the Aorus. In no single test did the gap exceed 2.5 seconds. That’s a real difference if you’re timing obsessively, but barely noticeable during normal play. Microsoft Flight Simulator 2024 showed the widest gap because of its aggressive streaming of high-resolution terrain data, where sustained sequential throughput actually matters during flight transitions.

Thermal performance is worth flagging for the Aorus Gen5 10000. PCIe 5.0 drives run hot, and the Aorus is no exception. Under sustained load, drive temperatures reached 78 degrees Celsius without a heatsink – high enough to trigger thermal throttling on some boards. Gigabyte includes a heatsink in the retail box, and with it installed temperatures stayed in the 60-65 degree range under stress. The SN850X, running on the older and less power-hungry Gen 4 controller, peaked at around 58 degrees without any heatsink at all. For compact ITX builds or cases with limited airflow, that thermal difference carries real weight.

Sustained write performance under long sequential transfers is another area where the Gen 5 drive shows both its potential and its limits. The Aorus Gen5 10000 maintained high speeds for the first 50 GB of a sustained write before dropping as the SLC cache filled. The SN850X showed a similar dip but at a smaller cache threshold. Neither drive is optimized for workstation-level data movement – they’re gaming drives first. For the broader NVMe market picture, sustained write behavior has become a key differentiator between gaming-focused and prosumer-grade SSDs.

Price, Value, and Who Should Buy Which

The Aorus Gen5 10000 in 2 TB retails at a meaningful premium over the WD Black SN850X in the same capacity. The SN850X regularly sells at competitive prices and frequently sees discounts, making it one of the better value propositions in high-performance gaming storage. If your system doesn’t have a PCIe 5.0 slot, the Aorus is off the table entirely – and even if it is available, the platform requirement means the performance gains are only accessible on relatively recent hardware.

For a dedicated gaming PC where load times and file transfer speed are priorities, the SN850X still makes more practical sense for most buyers. The Aorus Gen5 10000 earns its place in systems doing heavier mixed workloads – content creation alongside gaming, large asset libraries, or frequent multi-gigabyte file operations – where the sequential speed advantage actually gets used. The thermal demands of the Aorus also mean it works best in mid-tower or full-tower cases with decent airflow, not the small form factor builds where the SN850X operates without concern. Whether the Gen 5 premium justifies itself depends entirely on whether your workload can actually saturate a PCIe 4.0 drive first – and for most PC gamers in 2025, it still can’t.