A few months ago I bought a Intel Arc B580 for the main purpose of getting 8K video going [1]. I had briefly got it working in a test PC but then I wanted to deploy it on my HP z840 that I use as a build server and for playing with ML stuff [2]. I only did brief tests of it previously and this was my first attempt at installing it in a system I use. My plan was to keep the NVidia RTX A2000 in place and run 2 GPUs, that’s not an uncommon desire among people who want to do ML stuff and it’s the type of thing that the z840 is designed for, the machine has slots 2, 4, and 6 being PCIe*16 so it should be able to fit 3 cards that each take 2 slots. So having one full size GPU, the half-height A2000, and a NVMe controller that uses *16 to run four NVMe devices should be easy.
Intel designed the B580 to use every millimeter of space possible while still being able to claim to be a 2 slot card. On the circuit board side there is a plastic cover over the board that takes all the space before the next slot so a 2 slot card can’t go on that side without having it’s airflow blocked. On the other side it takes all the available space so that any card that wants to blow air through can’t fit and also such that a medium size card (such as the card for 4 NVMe devices) would block it’s air flow. So it’s impossible to have a computer with 6 PCIe slots run the B580 as well as 2 other full size *16 cards.
Support for this type of GPU is something vendors like HP should consider when designing workstation class systems. For HP there is no issue of people installing motherboards in random cases (the HP motherboard in question uses proprietary power connectors and won’t even boot with an ATX PSU without significant work). So they could easily design a motherboard and case with a few extra mm of space between pairs of PCIe slots. The cards that are double width are almost always *16 so you could pair up a *16 slot and another slot and have extra space on each side of the pair. I think for most people a system with 6 PCIe slots with a bit of extra space for GPU cooling would be more useful than having 7 PCIe slots. But as HP have full design control they don’t even need to reduce the number of PCIe slots, they could just make the case taller. If they added another 4 slots and increased the case size accordingly it still wouldn’t be particularly tall by the standards of tower cases from the 90s! The z8 series of workstations are the biggest workstations that HP sells so they should design them to do these things. At the time that the z840 was new there was a lot of ML work being done and HP was selling them as ML workstations, they should have known how people would use them and design them accordingly.
So I removed the NVidia card and decided to run the system with just the Arc card, things should have been fine but Intel designed the card to be as high as possible and put the power connector on top. This prevented installing the baffle for directing air flow over the PCIe slots and due to the design of the z840 (which is either ingenious or stupid depending on your point of view) the baffle is needed to secure the PCIe cards in place. So now all the PCIe cards are just secured by friction in the slots, this isn’t an unusual situation for machines I assemble but it’s not something I desired.
This is the first time I’ve felt compelled to write a blog post reviewing a product before even getting it working. But the physical design of the B580 is outrageously impractical unless you are designing your entire computer around the GPU.
As an aside the B580 does look very nice. The plastic surround is very fancy, it’s a pity that it interferes with the operation of the rest of the system.
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