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

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