Absolutely - it's answered in the FAQ tab on the product page:

How do you get the risers to reach the cards in 6 and 8 GPU setups?

We recommend 30cm XL powered 1x->16x risers from Buy-A-Hash to reach most of the cards. For cards that are further away, 1x->1x unpowered risers can be daisy chained, as long as the daisy chain is terminated by a 1x->16x powered riser. Unpowered risers can be purchased from Buy-A-Hash or on eBay.

We're working on our accessories section:)

There are several 7 and 8 slot boards, but they are quite expensive and more geared towards our HFT customers than our mining customers. It seems that 5 and 6 GPU motherboards are the sweet spot at the moment:)

Yes - typically a 2.5 or 3 slot card has better cooling than a 2 slot card (bigger heatsink), which is also nice, and there's enough space between the cards to cater to that.

Yeah - photograph is not my strong suite;) I've got a professional product photographer who's coming to visit in December, and will probably be re-shooting everything.

You'll have to excuse my crummy pre-editing photography, but this should illustrate it better: https://i.imgur.com/ky8VkG5.jpg

See how the PSU sits over the motherboard crossbar? There's no way the motherboard and the PSU can co-exist in the same space. I don't have any pics of 4 GPU setups at the moment, but I think it would be super tight. On the 6 or 8 GPU setup you have more space on the sides of the motherboard...but then the issue is the PSU crossbar. If you check this pic: https://openrigs.com/image/data/IMG_3094FLATF.jpg you will see that there are two vertical bars the PSU screws into, not just the corner bar. At the bottom of the pic you can see how that vertical bar comes into existence - we'd need to cut completely custom pieces of aluminium (outside of our standard measurements) to do that.

Just FYI, though, on 4 GPU setups you can get away with the connectors that come with the PSU - you'll only have 1 or 2 PCI-e adapters on the PSU anyway (maybe 3 if it's a 1250W+ PSU), so to power the 3rd and 4th GPUs you will have to use the Molex adapters that come with your PSU (for powering hard drives, optical drives, etc) and connect them into the Molex adapters that come with your GPUs. You can't get away from that, but all the bits come with your hardware. Using the Molex adapters like that gives much further reach than the PCI-e adapters that come with your PSU, and you'll have all those bits anyway.

The Arianna grid has holes drilled on both sides (as the next one in the row needs to bolt into that anyway) - the other problem that I forgot about is that a second PSU won't fit behind the motherboard, so no dice:( We'd have to fundamentally redesign things to make it longer and add another vertical PSU support bar, and then it would ruin the ability to stack horizontally in the Arianna grid.

It's shorter - spacing between GPUs is the same. Dimensions from the product page:

Assembled Dimensions:
  4 GPU: 70cm wide x 35cm long x 50cm high
  6 GPU: 90cm wide x 35cm long x 50cm high
  8 GPU: 110cm wide x 35cm long x 50cm high

We're busy designing a hard drive tray, waiting for various trays to arrive from one of our suppliers in China. Based on that we will add it as an option. At the moment most of our clients are using USB memory sticks (or letting the drive balance precariously on a corner:-P)

Whoops! Fixed that, the currency switcher div was overlayed over everything when we switched to mBTC (I should not be allowed to dabble with CSS;)

You can definitely use two PSUs, they'll just be mounted on the side per the pics:) There's some good info in the FAQ tab on the product page about using Molex extenders to reach the GPUs at the end if you need.

True, but it would increase costs (additional PSU support bar), plus 85% of our customers only run 1 PSU, and lastly it creates what we consider to be an undesirable heat map in both a Giorgina stack and a Arianna grid.

Yeah - we had an outage in the data center for about an hour at midnight GMT +2:) The site is working 100% now - you can add the items to your cart, then view your cart and use the shipping estimator.

Ah sorry man - it was a 1 day only special:) We'll be running some specials in the new year, but our Bitcoin Black Friday special was huge, so we'll probably have to wait till next year's Bitcoin Black Friday to repeat that!

We answer both those questions in the FAQ tab on the product page, here are cut and pastes for your reference:

Why is the PSU mounted on the side and not underneath the GPUs?

We spent a lot of time testing various configurations, including rear-mounted offset PSUs, vertical motherboard mounting, and so on. We ended up with the following requirements: PSUs need to be easily accessible, all configurations need to support dual PSUs, and regardless of whether a single PSU or dual PSUs are mounted there should be no airflow deadzones or unusual hotspots. The design we ended up with met all those criteria.

Can I mount two motherboards on an 8 GPU rig?

No, it's not designed for that, and that sort of configuration doesn't promote easy access to hardware and doesn't fit in with our design ethos. You are, of course, welcome to do whatever you want with it once you receive it, but we'd prefer customers opt for a horizontal row of Arianna grid frames than trying to re-purpose something.



Bottom line: we're not in the business of shaving a few cms off for a design that puts out customer's equipment at risk. Our designs are reasonably space efficient (I mean, look at their dimensions, it's barely a footprint) whilst ensuring excellent airflow with no dead zones.

I'm definitely open to suggestions, but for us to have a US reseller it would need to be someone we could trust not to mess up (too often), and we'd still have to incur the cost of some serious lawyering to govern the agreement. We do have it on our radar, amongst other things:)

We are looking at it - unfortunately the costs of operating in the US are exhorbitant; moulding costs, warehousing, staff costs, and a metric ton of costs associated with compliance. We'd end up having to nearly double our price to be profitable. The only benefit would be faster shipping to our US clients.

We've done quite extensive temperature measuring on stacks that are 5 rigs high, and we've noticed that the heat dissipates as it moves upwards. The cards at the top of the stack are definitely running several degrees warmer than the cards at the bottom, but there are two ways around that:

1. Reduce the ambient temperature of the room. The cards will naturally sit at 73° C - 77° C without any additional airflow; lowering the temperature of the room by 10° C makes any rise (of several degrees) inconsequential.

2. Bolt a box fan at the back of the rigs higher up in the "stack" (or use a free-standing, extendible floor fan) to move the hot air away from the rigs.

Edit: just to reiterate, this isn't some magical solution that removes the need for temperature monitoring and additional fans, it just reduces the box fan requirement for most of the rigs and lets you focus on cooling down those that are running unacceptably hot rather than wasting power on myriads of fans.

Spot on - thanks for answering the question in my absence:)

Sure, but we've got to remain cost competitive too, and the ATX standard allows for ISA-size cards to be supported entirely by their front bracket, so card manufacturers build accordingly. Take a look at the steel bracket and how it's attached to the card - that is NOT coming off purely by the weight of the card. We run Arianna barebones grids where the GPU is just bolted on to the square bar at the top, and we've never had a card fall off or break or be damaged. The additional GPU cross-bar on the consumer-grade design *is* for piece of mind:)

See what I said to aznatama above - the cards are solidly supported on that front bracket, and in all our testing we haven't found a reason to support the GPUs at the back just yet:)

Thanks so much for answering this whilst I was asleep! You're spot on - motherboard is supported on the front and back. It's hard to create tons of airflow and still have a full ATX plate, and it's also reasonably unnecessary for something like this in my experience:)

On the GPUs - we've played around with rear braces, and after a ton of fiddling we just keep finding it unnecessary. In our last test, we plugged and unplugged the DVI cable 500 times over a week without touching the card to brace it, and it was 100% fine. The GPU clips at the bottom held it in place and provided the additional support. I think the DVI port will wear out before anything else happens from a structural perspective.