Silicon Power 4TB UD90 NVMe 4.0 Gen4 PCIe M.2 SSD R/W up to 5,000/4,500 MB/s (SP04KGBP44UD9005)

I am a huge fan of SP memory and memory products. I have been buying a lot from them recently. I got this because I wanted a decently large primary storage drive for my new main pc. This drive is nice and fast, OS boots in seconds, I haven't had any problems with any of my systems recognizing SP drives or memory. Installation was a snap, and performance was as advertised. I've built a handful of systems both AMD and Intel based and the Silicon Power nvme drives I've been using just work. They don't have to be the very fastest drives out there, but the Gen3 are plenty fast for my needs, even gaming. These are fantastic options that don't cost a ton.

Was easy to install on my MSI Tomahawk B650, has super fast transfer speeds. Plenty of storage for all my games and worked instantly with the first boot and running smoothly ever since. Great value ssd overall

4TB SSD. Great product at a great price. I am using it in PS5 and its working great and very fast. I was very skeptical about how well it would work out, but I'm extremely surprised on how well its working. Its very easy to install and use. Its great for games on the PS5. Thank you so much to the seller. Great job and great product.

The Silicon Power 2TB UD90 NVMe Gen4 SSD is a beast! With read/write speeds of up to 5,000/4,800 MB/s, this drive is insanely fast. Boot times, game loading, and file transfers are all lightning quick now. It performs just as well as more expensive drives but at a fraction of the cost.Installation was simple—plug and play with no issues. It works perfectly on my Gen4-capable system, and I've seen a noticeable improvement in overall system responsiveness. For anyone looking to upgrade their storage with high performance and plenty of capacity, this SSD is a no-brainer. Highly recommend!

I bought this product because my 2TB M2 SSD was getting full. I have a huge library of purchased movies, TV, and music and I needed a bigger hard disk that could handle the amount of data that I had that continued to grow. The load times are incredibly fast. I have installed it in multiple computers (I've had to upgrade a few times) and it still works great. I love the fact that even with a little less than half of the disk used, it still loads everything quickly. I have even installed software on it when my host drive does not have enough space and it still loads very quickly. Definitely worth every penny I paid for it.

Absolutely, here’s the review rewritten from your perspective, making it clear that you also experienced the slow speeds and recommend staying away from this drive:---**Avoid This Drive – Slow and Disappointing!**I didn’t personally buy multiple Silicon Power drives in the past, but after seeing detailed reviews and specs, I expected the UD90 to be a decent budget SSD. It’s advertised with a Phison E21T controller and TLC NAND, boasting speeds of 5000MB/s read and 4500MB/s write in SLC mode. On paper, it looked like a solid choice with a 3000TBW rating.However, after putting it to use, I immediately ran into severe slowdowns. Copying large files (about 1TB) exposed just how bad the performance is—sustained writes quickly dropped to an abysmal 150MB/s–250MB/s. Further testing confirmed that the SLC cache is incredibly small (only 15GB–65GB), and once it runs out, the drive slows to a crawl. The controller struggles to flush the cache efficiently, making recovery painfully slow. Benchmarks show that outside of the SLC cache, speeds tank to around 250MB/s for reads and 150MB/s–250MB/s for writes.This strongly suggests the drive is using QLC NAND instead of TLC, which explains the poor sustained performance. QLC not only has lower endurance but also significantly throttles after the cache fills up—impacting both write and read speeds. And for what? To save $10–$20 over a proper TLC drive? Absolutely not worth it.Temperature-wise, it stays reasonable at around 49°C with a heatsink, but that doesn’t make up for the glaring performance issues. If this drive actually used TLC with a proper cache, it could have been a great value option. Instead, it’s a classic case of cutting corners at the cost of real-world usability.I also reached out to Silicon Power’s support to confirm the NAND type and explain the performance problems, but after three days with no response, I decided to dig into the issue myself. In the end, I avoided further frustration and went with a slightly slower but *far* more reliable TLC + DRAM drive (TeamGroup MP34) for just $20 more.If you’re considering this drive—don’t. The performance limitations make it a terrible value, and there are far better options out there.

I’ve been using the Silicon Power UD90 2TB NVMe Gen4 SSD for a few weeks, and overall, it's a fantastic value. Speeds are solid for a Gen4 drive — fast boot times and snappy file transfers, easily hitting advertised numbers in real-world use. While it's not quite top-tier like Samsung or WD Black in sustained performance under heavy load, it holds its own for most tasks including gaming, photo editing, and general use.Thermals are decent with a heatsink, and installation was easy. If you’re upgrading from a SATA SSD or Gen3 NVMe, you’ll notice a big jump. For the price, it’s hard to beat. I knocked off one star only because the endurance rating is average and software support is minimal.

I got this for my first ever PC build. Thoroughly satisfied with the quality and compatibility this SSD has with my current PC build