IO Crest SATA III PCIe Controller Card Review UK 2025

I’ve spent three weeks testing this PCIe SATA controller to see if it actually delivers the extra storage connectivity you need, or if it’s just another budget card that’ll cause more headaches than it solves.

The Marvell 88SE9215 controller is a familiar sight in budget SATA cards. It’s been around for years, which means driver support is mature and you’re unlikely to encounter compatibility nightmares. Windows 10 and 11 recognise it immediately, and Linux support is solid (I tested it on Ubuntu 22.04 without issues).

The low-profile bracket is a nice inclusion, even if the metal feels a bit thin. I’ve fitted cards in dozens of systems over the years, and I appreciate when manufacturers remember that not everyone’s building in a massive tower case. The bracket swap is straightforward – two screws, done.

What you won’t get is RAID functionality. The Marvell controller supports it in theory, but IO Crest hasn’t implemented it here. If you need RAID, you’ll be doing it through Windows Storage Spaces, mdadm on Linux, or your motherboard’s existing RAID controller. Personally, I’d prefer hardware RAID, but at this price point? You can’t really complain.

Performance is… exactly what you’d expect. And that’s actually a good thing.

I tested this card with a mix of drives: two SATA SSDs (Samsung 870 EVO and Crucial MX500) and two mechanical HDDs (Seagate BarraCuda 4TB). Sequential speeds on the SSDs hit the SATA III maximum of around 550MB/s read, which tells you the controller isn’t introducing any artificial limitations.

Random 4K performance was similarly unremarkable in the best way – basically identical to the same drives connected to my motherboard’s native SATA ports. If you’re worried about performance penalties from using an add-in card, don’t be. At least not with this one.

The real test came when I loaded all four ports and started hammering them simultaneously. File transfers, benchmarks, the lot. No crashes, no performance drops, no weird behaviour. The PCIe 2.0 x1 interface provides 500MB/s of bandwidth, which is technically less than four SATA III ports could theoretically use (4 x 600MB/s = 2400MB/s), but in practice? You’re never going to saturate all four ports at maximum speed simultaneously in normal use.

The SATA connectors themselves feel solid enough. I’ve plugged and unplugged cables dozens of times during testing without any looseness developing. That said, I wouldn’t want to be constantly swapping drives – these aren’t enterprise-grade connectors built for thousands of insertion cycles.

One thing that bothered me: the bracket doesn’t sit perfectly flush with the PCB. There’s a tiny bit of flex if you push on it. It’s secured fine once installed in a case, but it gives the whole thing a slightly dodgy feel when you’re handling it.

The Marvell controller chip runs cool. After hours of sustained transfers, I measured the chip temperature at around 45°C – barely warm to the touch. So the lack of a heatsink isn’t a thermal concern, just an aesthetic one (if you care about that sort of thing, which I don’t particularly).

Windows 10 and 11 recognise the Marvell controller immediately. No driver downloads, no configuration utilities, no nonsense. The drives appear in Disk Management just like they would on your motherboard’s native ports. Format them, assign drive letters, get on with your life.

I also tested on Linux (Ubuntu 22.04 and Manjaro) and had identical experiences. The kernel’s ahci driver handles it perfectly. Your drives just show up in /dev/ like any other SATA device.

One minor annoyance: the card adds a couple of seconds to boot time while the BIOS initialises the controller. Not a big deal, but noticeable if you’re used to fast NVMe boot times. Some motherboards let you disable the PCIe device’s option ROM to skip this, but that’s motherboard-dependent.

Compared to the cheaper JMicron alternatives (like the Syba SI-PEX40152), the IO Crest uses a more reliable Marvell controller. JMicron chips have a reputation for being a bit hit-and-miss with certain drive combinations, particularly older HDDs. I’ve had fewer compatibility headaches with Marvell controllers over the years.

The StarTech cards offer hardware RAID and generally better build quality, but you’re paying nearly 50% more for those features. If you need RAID and can afford the extra, go StarTech. If you just need four more SATA ports and RAID isn’t on your agenda, the IO Crest makes more sense.

The most common use case seems to be adding storage to older systems that are running out of SATA ports. Makes sense – if you’ve got a decent Core i5 or Ryzen system from a few years back that’s still perfectly capable but only has four motherboard SATA ports, spending £30-odd on an expansion card beats buying a new motherboard.

Value is where this card actually shines. You’re paying around £8-9 per SATA port, which is competitive with other budget options. The Marvell controller is a known quantity with good compatibility, which reduces the risk of buying a card that won’t work with your specific hardware combination.

Compare this to the cost of a new motherboard with more SATA ports (£100+ for anything decent), and the value proposition becomes clearer. If your system is otherwise fine and you just need more storage connectivity, this is a sensible solution.

That said, if you’re building a new system from scratch, I’d suggest spending a bit more on a motherboard with six or eight SATA ports rather than buying a cheaper board and adding this card. The integrated ports will generally be more reliable and won’t consume a PCIe slot.

The budget construction is the main compromise. The thin bracket, basic PCB, and lack of premium features like RAID make it clear this isn’t competing with £50+ cards. But if you’re simply adding storage to a home PC or media server and don’t need advanced features, why pay for them?

I’d recommend this for anyone with a working system that’s run out of SATA ports. It’s also useful for reviving older systems with limited native storage connectivity. Just don’t expect enterprise reliability or features you’d find on cards costing twice as much.