Corsair One Pro
Corsair One Pro /£ 2,200 inc VAT
We dissect Corsair’s first attempt to build an entire PC – a mini-ITX rig with a unique case, plus a liquidcooled CPU and GPU.
Corsair’s One Pro is a complete PC, not just a case from this well-known manufacturer. It’s a premium machine too, with aluminium side panels, a glowing front and liquidcooled hardware. It isn’t standard watercooling gear, but Corsair has created two custom slim all-in-one pump and radiator units to squeeze into the chassis, for the GPU and CPU respectively, with the motherboard and graphics card placed on opposite sides of the chassis courtesy of a PCI-E riser adaptor.
There are no fans on the radiators. Instead, a single 140mm ML-series in the roof draws air through the side vents and radiators before blowing it out the top. It’s a fantastic design that’s reminiscent of SilverStone’s mini-ITX and micro-ATX Fortress cases, although the One looks better. The case is well ventilated, although with passively cooled radiators and just a single 140mm fan, cooling isn’t going to be up to the standard of Corsair’s separate all-inone liquid coolers.
The interior sees practically every square centimetre being used, and it looks great – Corsair has clearly thought hard about the positioning of each component, building custom designs where necessary, and there are some great features. Corsair has added video output extensions from the graphics card, which is buried in the centre of the case, to get the ports to the outside. Meanwhile, there’s a single HDMI port on the front, with another one plus a pair of DisplayPort connectors on the rear, next to the motherboard I/O panel.
The motherboard seems to be a customised version of MSI’s Z270i Gaming Pro Carbon, and offers Wi-Fi, Realtek ALC1220 audio and USB 3.1 ports. To keep size to a minimum, Corsair has sensibly used one of its SFX PSUs.
There are several different hardware configurations of the One Pro, all currently with an Nvidia GTX 1080 8GB, which is liquid-cooled and sports a blower-style fan. There’s also a standard One model, which has a GTX 1070 6GB. The One Pro also has an Intel Core i7-7700K, although it hasn’t been overclocked. There’s 16GB of Corsair 2400MHz memory too, although you’d be right to expect faster memory in a machine at this price.
Meanwhile, the base storage option is a 480GB Corsair SSD with a 1TB or 2TB hard disk. At the moment, the One Pro isn’t available with an M.2 SSD, which seems odd given that Corsair now offers its own model – it seems like a no-brainer in a chassis where space is at a premium. Corsair says these drives weren’t available at the time of the One’s design, but that they will be incorporated into the One in the future.
It’s a decent spec that will push the 450W PSU hard, but a more pressing issue is the lack of dust filters in the side vents. The radiators behind them will eventually attract dust, which will need to be cleaned off. Thankfully, the side panels are easily removable, exposing the radiators. It’s not a deal breaker, but Corsair needs to address it in future revisions.
Performance was on the money for a GTX 1080-equipped PC, with the One Pro playing all our test games except Deus Ex: Mankind Divided at playable frame rates at 4K, with an impressive minimum frame rate of 39fps in The Witcher 3: Wild Hunt. The minimum of 26fps in Fallout 4 is only borderline playable, but dropping down to High settings will smooth out the frame rate. Dipping down to 2,560 x 1,400 saw the minimum frame rate in Deus Ex rise to 37fps too, and this resolution is where this spec of the One Pro is happiest – you need a GTX 1080 Ti for proper 4K gaming.
The system score of 137,052 is decent too, but it’s noticeably lower than overclocked systems. For example, the same CPU clocked to 4.7GHz in Chillblast’s recent Fusion Rollcage managed 149,077. The stock-speed graphics card also meant the One Pro was a little slower than some other GTX 1080 systems we’ve seen. With a maximum GPU delta T of just 48°C throughout testing, there’s clearly room to push the card a little further before it starts throttling.
The CPU delta T of 68°C was a little toasty though. The CPU core temperature didn’t get above 90°C, but it got close, which is probably why Corsair opted not to overclock it. In addition, it drew over 300W from the wall under full load, so applying massive overclocks could see the power
consumption rise to over 400W, which is a little close for comfort with a 450W PSU.
As such, the Core i7-7700K is the best choice of CPU for this system, even given the lack of an overclock – it’s simply the fastest mainstream Intel CPU and by no small margin. The plus side of those passive radiators, of course, is that the One Pro is remarkably quiet; it’s much more pleasant to sit next to the One Pro’s cooling system than some of Corsair’s all-in-one liquid coolers. There’s a small amount of pump whine and the fan spins up to audible levels under load, but the One Pro is near silent at low loads.
We absolutely love the Corsair One Pro’s design, and while temperatures did creep up under full load, they’re within thermal limits and the GPU remained fairly cool while gaming. Performance is excellent, if a little south of overclocked systems, but then they’ll be several times the size – the One Pro measures just 176 x 200 x 380mm (Wx D x H). The One Pro represents a brilliantly designed, premium mini-ITX PC, and the sacrifices are kept to a minimum.
It’s quiet, very well made and looks fantastic. You do pay a premium, though, and GTX 1080 Ti-based PCs can be bought for the same money, although thankfully Corsair will be offering a GTX 1080 Ti-based One Pro soon too. The One Pro isn’t cheap for the base specs, but it isn’t overpriced for the whole machine – it’s seriously well made and designed, and its ratio of performance to volume is second to none.
1 Corsair has sensibly used one of its SFX power supplies
2 There are no fans fitted to either of the radiators
3 The CPU sits on this side, while the GPU sits on the other